FMD Series
Including: FMD-1,2,3,4,5
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
42672.0000B 06/12 ©2009 Bunn-O-Matic Corporation
INTRODUCTION
Safety first!
To avoid electrical shock, unplug dispenser from power source before servicing inside.
Basic Maintenance
In order to maintain proper machine operation, a Preventative Maintenance schedule must be performed on a
regular basis.
The following procedures pretain to all versions in the FMD family of machines unless otherwise noted.
CONTENTS
Warranty ...................................................................................................................................2
User Notices .............................................................................................................................3
Site Preparation .......................................................................................................................3
Preventive Maintenance
Recommended Cleaning ....................................................................................................4
Preventive Maintenance Schedule.......................................................................................5
Troubleshooting........................................................................................................................6
Service....................................................................................................................................12
Electrical Schematics..............................................................................................................42
USER NOTICES
All notices on this equipment are written for your protection. All notices are to be kept in good condition.
Replace any unreadable or damaged labels.
SITE PREPARATION
A minimal clearance is required between the dispenser sides and the wall or another appliances. Leave some
space so the dispenser can be moved for cleaning.
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3
CLEANING
The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all sur-
faces on Bunn-O-Matic equipment. Do NOT clean this equipment with a water jet device.
1 x 24h
1. Rinse out Whipper Chambers by placing RINSE/RUN
switch in the "RINSE" position and activating DISPENSE
switches.
2. Turn elbow up, remove Hoppers, refill with product and
replace hoppers into dispenser.
3. Empty Drip Tray and wash in a solution of dish detergent.
1. Para limpiar las camaras de mezcla, coloque el interruptor en la
posicón ENJUAGUE/MARCHA (”RINSE/RUN”) y pulse el boton
para espumar y distribuir la bebida (”DISPENSE”).
2. Gire el codo hacia arriba, remueva las tolvas, llene las tolvas con
producto y coloque las tolvas nuevamente en la maquina.
3. Vacie la bandeja de goteo y limpiela con un detergente liquido
suave no abrasivo.
1 x 7d
9
1
6
2
8
7
5
3
4
a. Wash
b. Rinse
c. Sanitize c. Desinfecte
d. Dry d. Seque
a. Lave
b. Enjuague
Replace Light Bulbs
as required.
Cambie los bombillos
quemados cuando
sea necesario.
a
b
c
NOTICE
The cleaning instructions noted above are for non-dairy sugar based food products. When dispensing any other food product,
the cleaning cycle for the whipping chamber assembly and ejector elbow must be performed daily.
NOTA:
Las instrucciones de limpieza descritas anteriormente excluyen productos lacteos azucarados. La limpieza de las camaras
de mezcla y de los codos de salida de cada tolva deberá realizarse diariamente.
37254.0000A 07/04 © 2004 BUNN-O-MATIC CORPORATION
42672 122209
4
REQUIRED REGULAR MAINTENANCE:
When performing Daily-Weekly Cleaning procedures, inspect o-rings, seals, and bushings for signs of wear or
damage and replace immediately.
Check and/or replace every 6 months or as required:
32906.0000
25732.0000
Mixing Chamber Kit (Includes items indented below)
Steam Collector
Mixing Chamber
Whipper Chamber
Dispense Tip
O-ring
Frother
Shaft Seal
25733.0000
25734.0000
25736.0000
24733.0010
25902.0000
26356.0000
28866.0000
25903.0000
Receptacle
Elbow
29128.0000
Whipper Motor Seal Kit (Includes items indented below)
24733.0010
28867.0000
26356.0000
O-ring
Slinger
Shaft Seal
Check and/or replace every 3 months or as required:
26356.1000 Whipper Shaft Seal Kit (Contains 6 Seals)
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5
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
•
•
•
Inspection, testing, and repair of electrical equipment should be performed only by qualified service person-
nel.
All electronic components have high voltage ac and low voltage dc potential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.
Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
•
•
Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
•
•
Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
This unit is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the dispenser when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
PROBABLE CAUSE
REMEDY
Product will not dispense
1. No water
Water lines and valves to the dis-
penser must be open.
2. No power or incorrect voltage to (A) Check for correct voltage to the
the dispenser
dispenser.
(B) Check circuit breakers or fuses.
3. Dispense Switch
RefertoService-DispenseSwitchfor
testing procedure. See page 28
4. Digital Touch Control Switch
Refer to Service - Digital Touch
ControlSwitchfortestingprocedure.
See page 29
5. Dispense Solenoid Valve
6. Solenoid Valve (Inlet)
Refer to Service - Dispense Solenoid
Valve for testing procedures. See
page 47
Refer to Service - Solenoid Valve
(Inlet) for testing procedures. See
page 49
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6
TROUBLESHOOTING (cont.)
PROBLEM
Product will not dispense (cont.)
PROBABLE CAUSE
7. Level Control Board and Probe - RefertoService-LevelControlBoard
REMEDY
FMD-1
and Probe for testing procedures.
See page 41
8. Control Board
Refer to Service - Control Board and
Probe for testing procedures. See
page 20
9. Overflow Protection Switch
10. Auger Drive
Refer to Service - Overflow Protec-
tion Switch. See page 44
Refer to Service - Auger Drive. See
page 14
11. Water Strainer
(A) Direction of flow arrow must be
pointing towards dispenser.
(B)Removethestrainerandcheckfor
obstructions. Clear or replace.
12. Lime build-up
Inspect the tank assembly for ex-
CAUTION - Tank and tank compo- cessive lime deposits. Delime as
nents should be delimed regularly required.
dependingonlocalwaterconditions.
Excessive mineral build-up on stain-
less steel surfaces can initiate cor-
rosive reactions resulting in serious
leaks.
13. Transformer
Refer to Service - Transformer for
testing procedures. See page 40
14. Rinse Cycle Not Run
1. Limit Thermostat
RefertoCleaningforrunningaRinse
Cycle.
Water is not hot
Refer to Service - Limit Thermostat
CAUTION - Do not eliminate or by- for testing procedures. See page
pass limit thermostat. Use only BOM 43
replacement part #29329.1000
2. Control Thermostat
RefertoService-ControlThermostat
for testing procedures. See page
26
3. Tank Heater
Refer to Service - Tank Heater for
testing procedures. See page 50
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7
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Water is not hot (Cont.)
4. Tank Heater Switch
RefertoService-TankHeaterSwitch
for testing procedures. See page
52
5. Heater Relay
6. Control Board
1. Lime build-up
Refer to Service - Heater Relay for
testing procedures. See page 51
Refer to Service - Control Board for
testing procedures. See page 20
Spitting or excessive steaming
Inspect the tank assembly for ex-
CAUTION - Tank and tank compo- cessive lime deposits. Delime as
nents should be delimed regularly required.
dependingonlocalwaterconditions.
Excessive mineral build-up on stain-
less steel surfaces can initiate cor-
rosive reactions resulting in serious
leaks.
2. Control Thermostat
Refer to Service - Control Thermo-
stat for testing procedures. See
page 26
Dripping from dispense tip
1. Lime build-up
Inspect the tank assembly for ex-
CAUTION - Tank and tank compo- cessive lime deposits. Delime as
nents should be delimed regularly required.
dependingonlocalwaterconditions.
Excessive mineral build-up on stain-
less steel surfaces can initiate cor-
rosive reactions resulting in serious
leaks.
2. Dispense Solenoid Valve
Remove the dispense solenoid valve
and clear any obstructions. Rebuild
or replace the valve if necessary. See
page 47
Water flows into tank continuously
1. Control Board
Refer to Service - Control Board and
Probe for testing procedures. See
page 20
2. Solenoid Valve (Inlet)
Refer to Service - Solenoid Valve
(Inlet) for testing procedures. See
page 49
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8
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Water flows into tank continuously
(Cont.)
3. Overflow Protection Switch
Refer to Service - Overflow Protec-
tion Switch. See page 44
4. Digital Touch Control Switch
1. Water Temperature
Refer to Service - Digital Touch Con-
trol Switch for testing procedures.
See page 29
Weak product
Placeanemptycontainerbeneaththe
dispensetip.Initiateadispensecycle
and check the water temperature
immediately below the dispense tip
with a thermometer.(see thermostat
temperature settings decal)
2. Whipper Motor
3. Frother
Refer to Service - Whipper Motor for
testing procedure. See page 34
Refer to Service - Frother Compo-
nents. See page 33
4. Dispense Solenoid Valve
5. Auger Drive
Refer to Service - Dispense Solenoid
for test procedures. See page 47
Refer to Service - Auger Drive Com-
ponents. See page 14
6. Auger Spring
Refer to Service - Auger Drive Com-
ponents. See page 14
7. Auger Motor
Refer to Service - Auger Drive Com-
ponents. See page 14
8. Rinse/Run Switch
9. Rinse Timer
Refer to Service - Rinse/Run Switch
for test procedures. See page 45
Refer to the Installation and Operat-
ing Manual
10. Tank Heater Relay
11. Control Board
Refer to Service - Relay. See page
51
Refer to Service - Control Board. See
page 20
42672 122209
9
TROUBLESHOOTING (CONT.)
PROBLEM
PROBABLE CAUSE
REMEDY
1. Dispense Switch
RefertoService- DispenseSwitchfor
testing procedures. See page 28
Product overflows container
2. Dispense Solenoid Valve
Remove the solenoid valve and clear
any obstructions. Rebuild or replace
the valve if necessary. See page 47
1. Plumbing Lines
2. Water Supply
Plumbing lines should not be resting
on the counter top.
Dispenser is making unusual
noises
(A)Thedispensermustbeconnected
to a cold water line
(B) Water pressure to the dispenser
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the working pressure to ap-
proximately 50 psi (345 kPa).
3. Tank Heater
1. Fan
Remove and clean lime off the tank
heater. See page 50
Refer to Service - Fan for testing
procedures. See page 32
Excess dust
2. A) Hopper Drive Board - FMD-1 Refer to Service - Hopper Drive
Board for testing procedures. See
page 35
B) Control board
Refer to Service - Control Board for
testing procedures. See page 20
1. Lamp
Refer to Service - Lamp, see page
39 for lamp replacement.
Display not lit
2. Lamp Holder
3. Starter - Lamp
4. Ballast
Refer to Service - Lamp Holder for
testing procedures. See page 39
Refer to Service - Starter for testing
procedures. See page 40
Refer to Service - Ballast for testing
procedures. See page 19
42672 122209
10
NOTES
42672 122209
11
SERVICE
This section provides procedures for testing and replacing various major components used in this dispenser
should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any
problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel. The dispenser should be disconnected from the power source when servicing, except when electrical
tests are required and the test procedure specifically states to connect the dispenser to the power source.
COMPONENT ACCESS
WARNING - Disconnect the dispenser from the power source before the removal of any panel or the replacement
of any component.
All components are accessible by opening the door, removal of the door panels, dispenser top covers,
hopper(s), hopper support plate, splash guard, splash panel w/drip tray, lower front access panel and rear ac-
cess cover.
Refer to the contents listing for component location.
INDEX
Access Panels..................................................................................................................................13
Auger Drive Components.................................................................................................................14
Auxillary Control Board (FMD DBC-3)..............................................................................................17
Ballast..............................................................................................................................................19
Control Board (Main) ..................................................................................................................20,23
Control Thermostat..........................................................................................................................26
Dispense Switches...........................................................................................................................28
Digital Touch Control Switch............................................................................................................29
EMI Filter (FMD DBC-3) ...................................................................................................................31
Fan...................................................................................................................................................32
Frother ............................................................................................................................................33
Hopper Drive Board (FMD-1)...........................................................................................................35
Hot/Cold Switch (FMD DBC-3).........................................................................................................37
Increase/Decrease Switch................................................................................................................38
Lamp................................................................................................................................................39
Lamp Holder ....................................................................................................................................39
Lamp Starter & Socket.....................................................................................................................40
Level Control Board (FMD-1)...........................................................................................................41
Limit Thermostat..............................................................................................................................43
Overflow Protection Switch..............................................................................................................44
Rinse/Run Switch ............................................................................................................................45
Solenoid (Cold Drink).......................................................................................................................46
Solenoid (Dispense).........................................................................................................................47
Solenoid (Hot Water) .......................................................................................................................48
Solenoid (Inlet) ................................................................................................................................49
Tank Heater......................................................................................................................................50
Tank Heater Relay (FMD-4,5)...........................................................................................................51
Tank Heater Switch ..........................................................................................................................52
Transformer .....................................................................................................................................53
Whipper Motor.................................................................................................................................34
42672 122209
12
SERVICE(CONT.)
ACCESS PANELS
Location:
All access panels are similar through the whole FMD family (FMD-5 shown). Before removing panels, make
sure power is OFF to the machine and water is disconnected accept where indicated in testing procedures. Retain
all screws and other attaching hardware for re-assembly.
FMD-5 shown
FIG. 1 ACCESS PANELS
42672 122209
13
SERVICE (CONT.)
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
AUGER DRIVE COMPONENTS (all Models)
FMD-4 shown
5. Check the voltage across the positive (red wire)
terminal and the negative (black wire) terminal on
the auger motor with a voltmeter. With the rinse/
run switch in the run (lower) position press and
hold the dispense switch. Connect the dispenser
to the power supply. After a .6 second delay the
indication must be 4.0 to 24.5 volts dc.
Ifvoltageispresentasdescribed, theaugermotordrive
is operating properly. If auger does not turn, replace
the auger motor.
If voltage is not present as described, check the auger
hopper drive board.
1
J
2
J
4
J
3
J
1
J
2
J
Removal, Cleaning and Replacement
Hopper & Auger (FMD-1,4)
4
J
3
J
1. Open the dispenser door and raise the top front
cover.
P4095
2. Lift the hopper assy (15) over the pins on hopper
support plate (11) and slide hopper assembly out
the front of the dispenser.
3. Remove hopper lid (1) and empty product.
4. Pull off the ejector elbow (14).
5. Remove retainer clip (10) and washer (9) from the
bottom of the hopper base (8).
6. Remove whipper shaft (3), wiper blade (4) and
wiper drive gear (5) from the hopper base (8).
7. Remove auger wire (13) by pulling it out the front
of the hopper base (8).
8. Remove auger drive bracket (6) by unscrewing left
hand threads from auger drive shaft (12).
9. Slide spacer (7) and auger drive shaft bracket (6)
off of the auger drive shaft (12).
10. Remove auger drive shaft (12) from hopper base
(8).
11. Wash components in a mild solution of dish deter-
gent using a bristle brush when needed.
12. Rinse and dry each item thoroughly.
13. Checkfordamagedorbrokencomponents, replace
any if necessary and reassemble hopper assem-
bly.
14. Install hopper assy (15) in the dispenser by sliding
hopper assy on the hopper support plate (11) until
the slot in the rear of the hopper base (8) seats
against the pins in the hopper support plate (11).
42672 122209
FIG. 2 AUGER DRIVE COMPONENTS
Location
Theaugercomponentsarelocatedinsidethebottom
part of the hopper except for the auger drive bracket,
spacer and retaining clip, which are located on the
outside rear of the hopper base. The auger motor is
located on the lower right rear of the motor mounting
panel. Refer to Fig. 3 for disassembly and assembly.
Test Procedures - Auger Motor
1. Disconnect the dispenser from the power source.
2. Disconnect the white/red wire and the white wire
from the hopper drive board (FMD-1) or relative
wires from the control board(all other models).
3. Check the voltage across the white/red wire and
the white wire with a voltmeter. With the rinse/
run switch in the run (lower) position, connect the
dispenser to the power supply. The indication must
be:
a) 120 volts ac for two wire 120 volt models.
b)120 volts ac for three wire120/208 volt or
120/240 volt models.
c) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power supply.
14
SERVICE (CONT.)
Auger Drive Motor (Refer to Fig. 2)
1. Remove hopper assy (15), and set aside for reas-
sembly.
AUGER DRIVE COMPONENTS
FMD-4 shown
2. Removethefour#8-32screwssecuringthehopper
support plate (11), remove plate and set aside for
reassembly.
1
2
3. Remove the four #8-32 screws, located inside the
dispenser housing on the lower right front of the
auger motor mounting panel (19), securing auger
motor mounting bracket (16) and auger motor
(17) to the rear of the auger motor mounting panel
(19).
3
4
5
12
13
14
6
4. Disconnect the wires from the hopper drive
board.
7
8
9
10
5. Removeaugermotormountingbracket(16), auger
motor (17) and dust seal (18) as an assembly.
6. Remove dust seal (18) from auger motor (17).
7. Disconnect the wires from the auger motor (17).
8. Remove the four #8-32 screws securing the auger
motor (17) to the auger motor mounting bracket
(16).
15
9. Remove auger motor (17) and discard.
10. Using four #8-32 screws install new auger motor
(17) on mounting bracket (16).
11. Installdustseal(18)onaugermotorshaftandalign
notch in seal with motor casting.
12. Reconnect the wires to the terminals on the hopper
drive board.
13. Refer to schematic wiring diagrams when recon-
necting the wires.
14. Using four #8-32 locking screws install auger mo-
tor, dust seal and mounting bracket to the rear of
the auger motor mounting panel (19).
15. Install hopper assy (15).
16 17 18 19 11
P2633
FIG. 3 AUGER DRIVE & HOPPER DISASSEMBLY
1. Hopper Lid
2. Hopper
3. Wiper Shaft
4. Wiper Blade
5. Wiper Drive Gear
6. Auger Drive Bracket
7. Spacer
11. Hopper Support Plate
12. Auger Drive Shaft
13. Auger Wire
14. Ejector Elbow
15. Hopper Assembly
16. Auger Motor Bracket
17. Auger Motor
RED to Control Board
BLK to GRN from
8. Hopper Base
9. Washer
10. Retainer Clip
18. Dust Seal
19. Auger Motor Mounting
panel
Control Board
P1639
FIG. 4 AUGER MOTOR TERMINALS
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15
SERVICE (CONT.)
AUGER DRIVE COMPONENTS
FMD-5 shown
Removal, Cleaning and Replacement
1
2
Hopper & Auger (all other hoppers)
1. Open the dispenser door and raise the top front
cover.
4
5
2. Lift the front edge of hopper assy (20) over the
tab on hopper support plate (19) and slide hopper
assembly out the front of the dispenser.
3. Remove hopper lid (1) and empty product.
4. Pull off the ejector elbow (13).
3
8
5. Remove agitator disc assy (2) by pulling agitator
support rod (4) towards agitator disc assy and
lifting agitator disc assy from hopper (10).
6. Remove auger (12) by pulling it out the front of
the hopper (10).
7
6
9
10
7. Remove auger drive shaft (5) by removing the
retaining clip (6) from auger drive shaft.
8. Slide washer (8) and auger drive shaft bracket (7)
off of the auger drive shaft (5).
11
9. Slide auger drive shaft (5) from auger drive shaft
bushing (3) and remove from hopper (10).
10. Remove locknut (9) from auger drive shaft bushing
(3) and remove auger drive shaft bushing from
hopper (10).
11. Wash components in a mild solution of dish de-
tergent using a bristle brush when needed.
12. Rinse and dry each item thoroughly.
13. Check for damaged or broken components, replace
any if necessary and reassemble hopper assy.
14. Install hopper assy (20) in the dispenser by sliding
hopper assy in the guides on the hopper support
plate (19) until the slot in the bottom rear the hop-
per seats against the pin (18) in the hopper support
plate.
14 15 16 12 13
P2634
FIG. 5 AUGER DRIVE & HOPPER DISASSEMBLY
1. Hopper Lid
2. Mixing Blade
3. Agitator Disk
4. Auger Drive Shaft
Bushing
5. Auger Drive Shaft
6. Locknut
9. Auger Wire
10. Ejector Elbow
11. Hopper Assy
12. Auger Motor Mounting
Panel
13. Hopper Support Plate
14. Auger Motor Bracket
7. Auger Drive Bracket 15. Auger Motor
8. Hopper
16. Dust Seal
42672 122209
16
SERVICE (CONT.)
AUXILLARY CONTROL BOARD (FMD DBC-3 only)
4. Back probe check the voltage across pins 2 (black
wire) and 5 (white wire) of the six pin J2 connector
on the wiring harness with a voltmeter. Connect the
dispenser to the power source. The indication must
be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 6. If
voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
6. Check the voltage across the terminals of the hot
water dispense solenoid with a voltmeter. Connect
the dispenser to the power source. Press the hot
water dispense switch. The indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
7. Disconnect the dispenser from the power source.
P4102.40
FIG. 6 AUXILIARY CONTROL BOARD
Location:
The auxiliary control board is located behind the lower
front access cover, mounted on the rear side of the
component bracket.
Ifvoltageispresentasdescribedthehotwaterdispense
circuitry is operating properly. If voltage is not present
as described, replace the auxiliary control board.
Hot Water Dispense
Test Procedure:
Ready Light Circuit
Test Procedure:
1. Disconnect the dispenser from the power source.
2. With a voltmeter, and using the component mount-
ing bracket as a reference (-), back probe check
for voltage at pin 1 (red wire) of J1. Connect the
dispenser to the power source. The indication must
be approximately 37 volts dc.
1. Disconnect the dispenser from the power source.
2. With a voltmeter, and using the component mount-
ing bracket as a reference (-), back probe check
for voltage at pin 1 (red wire) of J1. Connect the
dispenser to the power source. The indication must
be approximately 37 volts dc.
3. Disconnect the dispenser from the power source.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 5. If
voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
If voltage is present as described, proceed to step 4. If
voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
42672 122209
17
SERVICE (CONT.)
AUXILLARY CONTROL BOARD (CONT.)
Removal and Replacement:
4. Onthedispenserwhipperpanel,ensurethatthetank
heater switch is in the “ON” (lower) position.
5. Disconnect the black wire coming from the control
thermostat from the limit thermostat.
6. Remove the control thermostat bulb from the
tank.
7. With a voltmeter, and using pin 5 as a reference,
back probe check for voltage, in turn, at pin 3 and
pin 6 of the six pin J2 connector of the wiring har-
ness. Connect the dispenser to the power source.
The indication must be :
1. Loosen the two #8-32 screws securing the compo-
nent mounting bracket to the dispenser housing.
2. Slidethecomponentmountingbracketforwarduntil
the screw heads align with the large diameters of
the keyhole openings.
3. Lift the component mounting bracket, and pull it
through the lower access panel opening.
4. Disconnect the two plugs on the main wiring har-
ness from the connectors on the auxiliary control
board.
5. Remove the two #6-32 keps nuts securing the
auxiliarycontrolboardtothe componentmounting
bracket.
6. Remove the auxiliary control board.
7. Removethetwosnap-instand-offsfromtheauxiliary
control board and install them in the new auxiliary
control board. Discard the old auxiliary control
board.
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
8. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 9. If
voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
8. Install the new auxiliary control board using the
two #6-32 keps nuts.
9. Reconnectthetwoplugsonthemainwiringharness
to the connectors on the auxiliary control board.
10. Replace the component mounting bracket and
tighten the two #8-32 screws.
9. Re-install the control thermostat bulb.
10. Notingthestartingpositionofthecontrolthermostat
knob, adjust the control thermostat knob counter-
clockwise until a click is heard.
11. With a voltmeter, check for voltage between pins 3
and 6 of the six pin J2 connector of the wiring har-
ness. Connect the dispenser to the power source.
The indication must be:
J2
a) 120 volts ac for two wire 120 volt models
b) 208 volts ac for three wire 120/208 or 240 volts
ac for three wire 120/240 volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
12. Disconnect the dispenser from the power source.
Return the control thermostat knob to the starting
position.
J1
If voltage is present as described, replace the auxiliary
control board. If voltage is not present as described,
refer to the wiring diagram and check the dispenser
wiring harness.
P1996.80
FIG. 7 AUXILIARY CONTROL
BOARD TERMINALS
42672 122209
18
SERVICE (cont.)
BALLAST (all Models)
FMD-4 shown
Removal and Replacement
1. Loosen the three #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
2. Pull component bracket out the front of the dis-
penser far enough so the leads on each ballast can
be disconnected from the main wiring harness and
the door interconnect harness.
3. Removethetwo#8-32screwssecuringeachballast
to the rear of the component bracket.
4. Remove and discard the ballast.
5. Install new ballast on the rear of the component
bracket and secure each with two #8-32 screws.
6. Refer to schematic wiring diagrams when recon-
necting the wires.
1
7. Place the component bracket into position and
tighten the two #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
J
2
J
4
J
3
J
1
J
2
J
4
J
3
J
BLK to BLK
from Main
P4095
Wiring Harness
FIG. 8 BALLASTS
Location
BLK to RED from
Main Harness
The front door lamp ballasts are located behind
the front access panel and may be on either side of the
component bracket assembly.
P1447
FIG. 9 BALLAST TERMINALS
Test Procedure
1. Disconnect the dispenser from the power source.
2. Disconnect the two black leads on the ballast from
the main harness.
3. Check for continuity between the two black leads
on the ballast.
If continuity is present as described the ballast is op-
erating properly.
If continuity is not present as described, replace the
ballast.
42672 122209
19
SERVICE (cont.)
CONTROL BOARD (FMD-2,-2FD,DBC-2FD,DBC-3)
FMD DBC-3 shown
4. With a voltmeter, back probe check the voltage
across pins 2 & 4 of the six pin J2 connector on
the wiring harness. Connect the dispenser to the
power source. The indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 volt models
or three wire 120/240 volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 6.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness back
to the power cord.
Liquid Level Control Circuitry
6. Carefully connect a piece of insulated jumper wire
to pin 3 (third from left on top row) of J1 on the
control board. Keep the other end of this wire away
from any metal surfaces of the dispenser.
7. With a voltmeter check the voltage across the
terminals of the inlet solenoid valve. Connect the
dispenser to the power source. After a 10 second
delay, the indication must be :
P4102.40
FIG. 10 CONTROL BOARD
Location:
The Control Board is located behind the lower front
access cover mounted on the component bracket.
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
Test Procedure:
Power Supply:
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
8. Touch the free end of the jumper wire to the dis-
penser housing. The indication must be 0.
1. Disconnect the dispenser from the power source.
2. With a voltmeter, back probe check the voltage
across pins 1 & 2 of the eight pin J1 connector
on the wiring harness. Connect the dispenser to
the power source. The indication must be 24 volts
ac.
If voltage is present as described, proceed to step 9.
If the voltage is not present as described, replace the
control circuit board.
NOTE: Verify the ground wire is connected to the board
mounting stud before replacing the control board.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness back
to the transformer.
9. Gently pull the liquid level probe out of the tank lid
and inspect for corrosion. Replace it if necessary.
10. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
42672 122209
20
SERVICE (cont.)
CONTROL BOARD (CONT.)
11. With a voltmeter check the voltage across the
terminals of the inlet solenoid valve. Connect the
dispenser to the power source. After a 10 second
delay, the indication must be :
5. With a voltmeter check the voltage across the red
(+) terminal and the black (-) terminal of the auger
motor. Connect the dispenser to the power source.
Press the appropriate dispense switch. After a
delay of about .6 seconds, the indication must be
between +4.0 and +24.5 volts dc.
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
If the voltage is present as described, the hopper motor
control circuitry is operating properly.
12. Move the probe’s flat end to the dispenser housing. If the voltage is not present as described, replace the
The indication must be 0.
control circuit board.
13. Move the probe’s flat end away from the housing.
After a 5 second delay, the indication must, again,
be:
Whipper Motor and Dispense Solenoid Circuitry:
1. Disconnect the dispenser from the power source.
2. With a voltmeter, back probe check the voltage
across pins 1 & 2 of the eight pin J1 connector
on the wiring harness. Connect the dispenser to
the power source. The indication must be 24 volts
ac.
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
14. Disconnect the dispenser from the power source.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
If the voltage is present as described, re-install the
probe. The liquid level control circuitry is operating
properly.
If the voltage is not present as described, check the
pink probe wire and green tank wire for continuity and
check the overflow protection switch.
4. Check that the RINSE/RUN switch is in the “Rinse”
position.
5. With a voltmeter, back probe check the voltage
across pins 2 & 4 of the six pin J2 connector on
the wiring harness. Connect the dispenser to the
power source. The indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
6. Disconnect the dispenser from the power source.
7. With a voltmeter check the voltage across the
terminals of the appropriate dispense solenoid.
Connect the dispenser to the power source. Press
the appropriate dispense switch. The indication
must be :
Hopper Motor Control Circuitry:
1. Disconnect the dispenser from the power source.
2. With the voltmeter, back probe check the voltage
across pins 1 & 2 of the eight pin J1 connector on
the wiring harness. Connect the dispenser to the
power source. The indication must be 24 volts ac
from the transformer.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
4. Check that the “Rinse/Run” switch is in the “Run”
position.
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
42672 122209
21
SERVICE (cont.)
CONTROL BOARD (cont.)
If the voltage is present as described, the whipper mo-
tor and dispense solenoid control circuitry is operating
properly.
J1
If the voltage is not present as described, replace the
control circuit board.
J2
Removal and Replacement:
J1
1. Disconnect the three plugs on the main wiring har-
ness from the connectors on the control board.
2. Remove the four #6-32 keps nuts securing the
control board to the component bracket.
3. Remove control board and discard.
4. Installnewcontrolboardonthecomponentbracket
using four #6-32 keps nuts.
J3
J2
J4
J3
5. Reconnect the three plugs on the main harness to
the connectors on the control board.
P1680
FIG. 11 CONTROL BOARD CONNECTORS
42672 122209
22
SERVICE (cont.)
CONTROL BOARD (FMD-3,-4,-5)
5. Disconnect the dispenser from the power source.
FMD-4 shown
If voltage is present as described, proceed to step 6.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
6. Carefully connect a piece of insulated jumper wire
to pin 10 (top right) of J2 on control board #1.
Keep the other end of this wire away from any metal
surfaces of the dispenser.
7. Check the voltage across the terminals of the
inlet solenoid valve with a voltmeter. Connect the
dispenser to the power source. The indication
must again be 120 volts ac for two wire 120 volt
models, three wire 120/208 volt models, three wire
120/240 volt models, or 230 volts ac for two wire
230 volt models after a delay of approximately 10
seconds.
1
J
2
J
4
J
3
J
1
J
2
J
4
J
3
J
8. Touch the free end of the jumper wire to the dis-
penser housing. The indication must be 0.
9. Move the jumper wire away from the housing. The
indication must again be 120 volts ac for two wire
120 volt models, three wire 120/208 volt models,
three wire 120/240 volt models, or 230 volts ac
for two wire 230 volt models after a delay of ap-
proximately 5 seconds.
#2
#1
P4095
FIG. 12 CONTROL BOARD
Location:
The Control Board(s) are located behind the
lower front access cover mounted on the component
bracket.
10. Disconnect the dispenser from the power source
and remove the jumper wire.
Test Procedure:
Liquid Level Control Circuitry(Control Board #1):
1. Disconnect the dispenser from the power source.
2. Back probe check the voltage across pins 5 & 6 of
the six pin J3 connector on the wiring harness with
a voltmeter. Connect the dispenser to the power
source. The indication must be 24 volts ac.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step
11.
If the voltage is not present as described, replace
control board #1.
11. Gently pull the liquid level probe out of the tank lid
and inspect for corrosion. Replace it if necessary.
12. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
13. Check the voltage across the terminals of the
inlet solenoid valve with a voltmeter. Connect the
dispenser to the power source. The indication
must again be 120 volts ac for two wire 120 volt
models, three wire 120/208 volt models, three wire
120/240 volt models, or 230 volts ac for two wire
230 volt models after a delay of approximately 10
seconds.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
4. Back probe check the voltage across pins 1 & 4 of
thefourpinJ4connectoronthewiringharnesswith
a voltmeter. Connect the dispenser to the power
source. The indication must be 120 volts ac for
two wire 120 volt models, three wire 120/208 volt
models, three wire 120/240 volt models, or 230
volts ac for two wire 230 volt models.
42672 122209
23
SERVICE (cont.)
CONTROL BOARD (CONT.)
Tank Heater Relay Control Circuitry (Control Board #2)
(120V dispensers only):
14. Move the probe’s flat end to the dispenser housing.
The indication must be 0.
1. Disconnect the dispenser from the power source.
2. Back probe check the voltage across pins 5 & 6 of
the six pin J3 connector on the wiring harness with
a voltmeter. Connect the dispenser to the power
source. the indication must be 24 volts ac.
15. Move the probe’s flat end away from the housing.
The indication must again be 120 volts ac for two
wire 120 volt models, three wire 120/208 volt
models, three wire 120/240 volt models, or 230
volts ac for two wire 230 volt models after a delay
of approximately 5 seconds.
3. disconnect the dispenser from the power source.
16. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
If the voltage is present as described, re-install the
probe. The liquid level control circuitry is operating
properly.
4. Back probe check the voltage across pins 1 & 4 of
the four-pin J4 connector on the wiring harness
with a voltmeter. The indication must be 120 volts
ac.
Ifthevoltageisnotpresentasdescribed,checkthepink
probe wire and green tank wire for continuity.
Hopper Motor Control Circuitry (Stations 1-3, Control
Board #1 & Stations 4-5, Control Board #2):
5. Disconnect the dispenser from the power source.
1. Disconnect the dispenser from the power source.
2. Back probe check the voltage across pins 5 & 6 of
the six pin J3connector on the wiring harness with
a voltmeter. Connect the dispenser to the power
source. The indication must be 24 volts ac.
If voltage is present as described, proceed to step 6.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
6. Check the voltage across the coil terminals of the
tank heater relay with a voltmeter. Connect the
dispenser to the power source. The indication must
be 0 volts ac.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
If voltage is absent as described, proceed to step 7.
If voltage is present, replace the control circuit board
#2.
4. Check that the rinse/run switch is in the run posi-
tion.
5. Check the voltage across the red (+) terminal and
the black (-) terminal of the auger motor with a volt-
meter. Connect the dispenser to the power source.
Press and hold the appropriate dispense switch.
After a delay of about .6 seconds, the indication
must be between +4.0 and +24.5 volts dc.
7. Place containers below any three dispenser noz-
zles.
8. Simultaneously initiate dispenses at each of the
selected dispense stations while monitoring the
voltage across the coil terminals of the tank heater
relay. The indication must be 120V ac.
If the voltage is present as described, the hopper motor
control circuitry is operating properly.
If the voltage is not present as described, replace the
control circuit board.
If voltage is present as described, the control board #2
is functioning correctly.
Ifvoltageisnotpresentasdescribed,replacethecontrol
circuit board #2.
42672 122209
24
SERVICE (cont.)
CONTROL BOARD (CONT.)
Removal and Replacement:
CONTROL BOARD #1
J1 J2
J1 J2
1. Disconnect the three plugs on the main wiring har-
ness from the connectors on the control board.
2. Remove the four #6-32 keps nuts securing the
control board to the component bracket.
3. Remove control board and discard.
4. Installnewcontrolboardonthecomponentbracket
using four #6-32 keps nuts.
J1
J2
J4
J3
J1
5. Reconnect the three plugs on the main harness to
the connectors on the control board.
J2
J4
NOTE: J4 is not connected on Control Board #2 on
120/208 - 240V dispensers.
J4
J3
J3
CONTROL BOARD #2
J4
J3
P2637
FIG. 13 CONTROL BOARD CONNECTORS
42672 122209
25
SERVICE (cont.)
CONTROL THERMOSTAT (FMD-1,-2,-2FD,-3,-4,-5)
Electronic Thermostat (Optional):
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermostat
from the black wire from the limit thermostat.
3. Remove temperature probe from the tank.
4. Withavoltmeter, checkthevoltageacrosstheblack
wirefromthecontrolthermostatandthewhite wire
on the tank heater with the tank heater switch in
the “ON” (lower) position. Connect the dispenser
to the power source. The indication must be120
volts ac for two wire 120 volt models.
FMD-3 shown
Ifvoltageispresentasdescribedthecontrolthermostat
is operating properly. Reinstall temperature probe into
the tank.
Ifvoltageisnotpresentasdescribed,replacethecontrol
thermostat.
P1445
FIG. 14 CONTROL THERMOSTAT
Location:
Removal and Replacement:
1. Disconnect the wires from the thermostat.
2. Remove the thermostat capillary bulb/temperature
probebyfirmlypullinguponthecapillary grommet
at the tank lid.
The control thermostat (mechanical or electronic)
is located inside the dispenser on the upper left side
of the housing.
3. Loosen the two #8-32 screws securing the thermo-
stat bracket to the upper left rear of the dispenser
housing.
4. Remove thermostat bracket and thermostat as an
assembly.
5. Install the new thermostat and bracket inside the
dispenser housing on the upper left rear side and
tighten the two #8-32 screws.
6. Slide the grommet to the line 4.5" above the bulb
on the new capillary tube (mechanical thermostat
only).
7. Insertthecapillarybulb/temperatureprobe through
theholeinthetanklidandpressthegrommetfirmly
and evenly so that the groove in the grommet fits
into the tank lid.
8. Carefullybendthecapillarytubesothatthetubeand
bulb inside the tank are in the vertical position and
away from any electrical connections (mechanical
thermostat only).
Test Procedure:
Mechanical Thermostat:
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermostat
from the black lead from the limit thermostat.
3. Remove bulb from the tank.
4. With a voltmeter, check the voltage across black
wire on the control thermostat and the white or red
wire on the tank heater with the tank heater switch
in the “ON” (lower) position. Connect the dispenser
to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 208 volts ac for three wire 120/208 volt mod-
els.
c) 240 volts ac for two wire 240 volt models and
three wire 120/240 volt models.
d) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
9. Refer to Fig. 15 and reconnect the wires.
If voltage is present as described the control thermostat
is operating properly. Reinstall bulb into the tank.
If voltage is not present as described, replace the
thermostat.
NOTE-Thecapillarytubemustbeclearofanyelectrical
termination and not kinked.
42672 122209
26
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
TAN to WHI/BRN in
Main Wiring Harness
BLK to Main
Wiring Harness
WHI to Main
Wiring Harness
BLK from Limit
Thermostat
BLK from Tank
Heater Switch
BLK to Main
Wiring Harness
MECHANICAL THERMOSTAT
ELECTRONIC THERMOSTAT
P1448
FIG. 15 THERMOSTAT TERMINALS
42672 122209
27
SERVICE (cont.)
DISPENSE SWITCHES (FMD-1,-2,-2FD,-3,-4,-5)
FMD-5 shown
If voltage is present as described, proceed to #7.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
7. Check for continuity across the terminals (top right
to top left; bottom right to bottom left) of the dis-
pense switch with the switch in the “ON” position.
Continuity must not present when the switch is in
the “OFF” released position.
If continuity is present as described, reconnect the
connector to the door interconnect wiring harness, the
switch is operating properly.
If continuity is not present as described, replace the
switch.
P2636
FIG.16 DISPENSE SWITCHES
Removal and Replacement
1. Open the dispenser door.
2. Remove the six #8-32 screws securing the bottom
door cover and remove cover.
Location:
The dispense switches are located on the lower
outside of the dispenser door.
3. Disconnect the wires on the dispense switch from
the door interconnect wiring harness.
4. Compress the clips inside the door on the dispense
switch and gently push the switch through the
opening
5. Push the new switch into the opening and spread
the clips to hold the switch in the door.
6. Reconnect the wires to the dispense switch from
the door interconnect wiring harness.
7. Reinstall the door bottom cover using six #8-32
screws.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Open the dispenser door and remove the bottom
door cover.
3. Disconnectthewiresfromthedoorinterconnectwir-
ing harness to the dispense switch to be tested.
4. Check for voltage across the black and red/white
wires for the dispense switch to be teseted from
the door interconnect wiring harness. Connect the
dispenser to the power supply. The indication must
be:
8. Refer to schematic wiring diagrams when recon-
necting the wires.
a) 120 volts ac for two wire 120 volt models.
b)120voltsacforthreewire120/208voltor120/240
volt models.
c) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
6. With a voltmeter, check the voltage across the
remaining two wires of the dispense switch being
tested from the door interconnect wiring harness.
Connect the dispenser to the power source. The
indication must be +5 volts dc.
P1449
FIG. 17 DISPENSE SWITCH TERMINALS
42672 122209
28
SERVICE (cont.)
DIGITAL TOUCH CONTROL SWITCH (FMD DBC-2,DBC-3)
FMD DBC-3 shown
If voltage is present as described, proceed to step 7.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring harness.
7. While pressing the appropriate switch, check for
continuity across the following pins of the digital
touch control switch assembly’s multi-pin connec-
tor:
Note: Pin 1 of the connector is identified by an arrow
embossed on the connector housing.
FMD DBC-3:
Left Small : pin 1 to pin 2
Left Medium: pin 2 to pin 3
Left Large: pin 1 to pin 3
Stop: pin 1 to pin 4
P1631
FIG.18 DIGITAL TOUCH CONTROL SWITCH
Center Small: pin 1 to pin 5
Center Medium: pin 5 to pin 6
Center Large: pin 1 to pin 6
Right Small: pin 1 to pin 7
Right Medium: pin 7 to pin 8
Right Large: pin 1 to pin 8
Hot Water: pin 1 to pin 13
Location:
The digital touch control switch is located on the lower
outside of the dispenser door.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Open dispenser door and remove the bottom door
cover.
3. Disconnect the wires from the door interconnect
wiring harness to the digital touch control switch
assembly.
4. With a voltmeter, and using pin 1 of the multi-pin
connector of the door interconnect wiring harness
as a reference (-), check for voltage at each of the
other pins of the connector. Connect the dispenser
to the power source. The indication must be +5
volts dc.
FMD DBC-2FD:
Left Small : pin 1 to pin 2
Left Medium: pin 2 to pin 3
Left Large: pin 1 to pin 3
Stop: pin 1 to pin 4
Right Small: pin 1 to pin 5
Right Medium: pin 5 to pin 6
Right Large: pin 1 to pin 6
Hot Water: pin 1 to pin 7
5. On dispensers with a hot water valve, with a volt-
meter, and using pin 1 of the multi-pin connector
of the door wiring harness as a reference (-), check
for voltage at pin 13 (blue/red wire). Connect the
dispenser to the power source. The indication must
be approximately 37 volts dc.
If continuity is present as described, the membrane
switch assembly is operating properly.
If continuity is not present as described, replace the
membrane switch assembly.
6. Disconnect the dispenser from the power source.
42672 122209
29
SERVICE (cont.)
DIGITAL TOUCH CONTROL SWITCH (cont.)
Removal and Replacement:
1. Open the dispenser door.
2. Remove the five #6-32 screws securing the bottom
door cover and remove cover.
TO DOOR INTERCONNECT
HARNESS CONNECTOR
Align arrows on
connectors
3. Disconnect the wires on the dispense switch to be
removed from the door interconnect wiring har-
ness.
4. From inside the door gently push the switch away
from the door and discard.
5. Remove the paper from the adhesive backing on
the switch and feed the ribbon cable on the back
of switch through the slot in the door.
6. Firmly press the new switch into the opening on
the door to hold the switch in the door.
7. Reconnect the wires to the dispense switch from
door interconnect wiring harness.
P1685
FIG. 19 DIGITAL TOUCH CONTROL
SWITCH
8. Reinstall the door bottom cover using five #6-32
screws.
9. Refer to Fig. 19 when reinstalling wires.
42672 122209
30
SERVICE (cont.)
EMI FILTER (230 Volt FMD DBC-3)
Removal and Replacement:
1. Disconnect the wires from the EMI Filter.
2. Remove the two #8-32 screws and nuts securing
the EMI Filter.
3. Remove and discard EMI Filter.
4. Install new EMI Filter using two #8-32 screws and
nuts to secure EMI Filter to its former location.
5. Refer to schematic wiring diagrams when recon-
necting the wires.
FIG. 20 EMI FILTER
Location:
The EMI Filter is located on the rear of the dispenser
base on FMD DBC-3.
118.0 kΩ - 118.5 kΩ
Across either pair
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the two black wires and two white
wires on the EMI Filter from the EMI Filter wiring
harness.
3. Check for resistance between the two black leads
on the EMI Filter.
FIG. 21 EMI FILTER CONNECTORS
If resistance is present as described the EMI Filter is
operating properly.
If resistance is not present as described, replace the
EMI Filter.
42672 122209
31
SERVICE (cont.)
VACUUM FAN (all Models)
FMD DBC-3 shown
Removal and Replacement:
1. Disconnect the vacuum hose from the fan.
2. Remove the two #8-32 locking screws securing the
fan to the dispenser housing base plate.
3. Disconnect the wires from the fan terminals and
discard the fan
4. Refer to schematic wiring diagrams when recon-
necting the wires.
5. Install new fan using two #8-32 locking screws.
6. Reconnect the vacuum hose to the fan.
BLK from Main
WiringHarness
P4102.40
FIG. 22 FAN
Location:
The fan is located inside the dispenser housing on
the right rear of the dispenser base plate.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the black and white wires from the fan
terminals.
3. With a voltmeter, check the voltage across the
black and white wires. Connect the dispenser to
the power source. The indication must be:
a) 120 volts ac for two wire 120 volt, three wire
120/208 volt and 120/240 volt models.
b) 240 volts ac for two wire 240 volt models.
c) 230 volts ac for two wire 230 volt models.
WHI from Main Wiring Harness
P1507
FIG. 23 FAN TERMINALS
If voltage is present as described, replace the fan.
If voltage is not present as described, refer to Wiring
Diagrams and check the dispenser wiring harness.
42672 122209
32
SERVICE (cont.)
FROTHER AND WHIPPER MOTOR (all Models except -2FD)
FMD DBC-3 shown
11 12 13
1
2
P4102.40
FIG. 24 FROTHER AND WHIPPER MOTOR
Location:
10
The frothers are located behind the dispenser door,
mounted on the whipper motor shaft inside the whipper
chamber.
9
8
7 6
5
4
3
P1630.35
The whipper motors are located on the back side
of the whipper motor mounting panel.
FIG. 25 MIXING/WHIPPER CHAMBER
COMPONENTS
1. Steam Collector
2. Mixing Chamber
3. Dispense Tip
4. Whipper Chamber
5. O-Ring
6. Frother
7. Nut
8. Receptacle w/Seal
9. Slinger
10. Motor Assy.
11. Fan
12. Vacuum Hose
13. Baffle
Test Procedure:
1. Check that the rinse/run switch is in the rinse (up)
position.
2. Disconnect the dispenser from the power source.
3. Disconnect both wires from the black leads on the
motor to be checked.
4. Press and hold the appropriate dispense switch
and, with a voltmeter, check the voltage across the
disconnected harness. Connect the dispenser to the
power source. The reading must be:
a) 120 volts ac for two wire 120 volt models, three
wire 120/208 volt and 120/240 volt models.
b) 240 volts ac for two wire 240 volt models.
c) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
Removal, Cleaning & Replacement (Refer to Fig. 25):
1. Disconnect the dispenser from power.
2. Open the dispenser door and turn elbows up.
3. Remove the steam collectors (1) by pulling forward
and at the same time twisting clockwise.
4. Pull the mixing chamber (2) out of the whipper
chamber (4).
5. Remove dispense tip (3) and twist the whipper
chamber (4) clockwise and pull it off the whipper
chamber receptacle (8).
If voltage is present as described, replace the motor.
If voltage is not present as described, refer to the Wiring
Diagrams and check the dispenser wiring harness
42672 122209
33
SERVICE (cont.)
FROTHER AND WHIPPER MOTOR (cont.)
20. Installwhipperchamber(4)onthewhipperchamber
receptacle (8) by twisting counterclockwise until
the tabs on the whipper chamber (4) lock with the
tabs on the whipper chamber receptacle (8). Be
sure dispense port is pointing down.
21. Install dispense tip (3) into the bottom of the whip-
per chamber (4).
22. Slipthemixingchamber(2)ontothemixingchamber
water inlet tube far enough so the mixing chamber
(2) will seat inside the whipper chamber (4).
23. Installthesteamcollector(1)ontothemixingcham-
ber (2) by pushing down and toward the dispenser
whiletwistinguntiltheflangeonthesteamcollector
lines up with the slot in the front panel.
24. Install hopper assembly in the dispenser by slid-
ing hopper assembly on the hopper support panel
until the slot in the bottom rear of the hopper seats
against the shoulder screw in the hopper support
panel.
6. Pull the frother (6) off the motor shaft. Notice the
flat side on the shaft and the matching flat inside
the frother. It is important that these two flats are
lined up when reassembling.
7. Slip the o-ring (5) off the whipper chamber recep-
tacle (8).
8. Removenearestsidepanelanddisconnectwhipper
motor wires.
9. Removethetwonuts(7)securingwhipperchamber
receptacle (8) and whipper motor (10) to the front
panel.
NOTE: To remove the recptacle only, rotate clockwise
until the receptacle clears the nuts (7) and slides
off of the motor shaft.
10. Slide the receptacle with seal off of the motor
shaft.
11. Slide the slinger (9) off of the motor shaft.
12. Remove motor and discard.
13. Install new motor (10) on rear of front panel and
secure with two nuts (7) and connect black leads
on the motor to the main wiring harness. Refer to
Fig. 27 when reconnecting wires
25. Reinstall side panel.
26. Reconnect to power and test.
14. Slide slinger (9) onto the motor shaft flush against
the front panel.
15. Wash remaining components in a mild solution of
dish detergent using a bristle brush.
16. Rinsethoroughlyandallowtodrybeforereinstalling
in the dispenser.
17. Slidewhipperchamberreceptaclewithseal(8) and
o-ring (5) on to the motor shaft.
18 Rotatethereceptaclewithseal(8)counterclockwise
untilitsnapsintoplaceonthemotormountingnuts
(7).
19. Push frother (6) onto the motor shaft, making sure
the flat in the frother (6) lines up with the flat on
the motor shaft.
BLK to Main Harness
BLK to Main Harness
FIG. 26 WHIPPER MOTOR TERMINALS P1451.40
42672 122209
34
SERVICE (cont.)
HOPPER DRIVE BOARD - FMD-1 ONLY
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness.
5. Check the voltage across the positive (red wire)
terminal and the negative (black wire) terminal on
the auger motor with a voltmeter. With the rinse/
run switch in the run (lower) position press and
hold the dispense switch. Connect the dispenser
to the power supply. After a .6 second delay the
indication must be 4.0 to 24.5 volts dc.
If voltage is present as described,the auger motor drive
is operating properly. If auger does not turn replace
the auger motor.
If voltage is not present as described, replace the hop-
per drive board.
P1665
FIG. 27 HOPPER DRIVE BOARD
Location
The hopper drive board is located inside the dispenser
mounted on the auger motor mounting bracket.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the white/red wire and the white wire
from the hopper speed control board.
3. Check the voltage across the white/red wire and
the white wire with a voltmeter. With the rinse/
run switch in the run (lower) position, connect the
dispenser to the power supply. The indication must
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models.
c) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power supply.
42672 122209
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SERVICE (cont.)
HOPPER DRIVE BOARD - FMD-1 ONLY
Removal and Replacement: (Refer to Fig. 27)
1. Remove hopper assy (17), and set aside for reas-
sembly.
RED from Hopper
Motor
2. Removethefour#8-32screwssecuringthehopper
support plate (12), remove plate and set aside for
reassembly.
J1 Connector for
Three Pin Plug from
Potentiometer
3. Remove the four #8-32 screws, located inside the
dispenerhousingonthelowerrightfrontoftheauger
motor mounting panel (21), securing auger motor
mounting bracket (18) and auger motor (19) to the
rear of the auger motor mounting panel (21).
4. Disconnect the wires from the terminals on the
hopper drive board and disconnect the three pin
plug (J1) from the hopper drive board.
5. Removeaugermotormountingbracket(18), auger
motor (19), dust seal (20) and hopper drive board
as an assembly.
6. Remove the two #8-32 screws securing the hopper
drive board to the auger motor mounting bracket.
7. Remove the two spacers from the hopper drive
board and discard board.
BLK from
Hopper Motor
RED/WHI from
Main Harness
WHI from Main
Harness
P1669
FIG. 28 HOPPER DRIVE BOARD TERMINALS
8. Install spacers on new hopper drive board.
9. Install new hopper drive board to the auger motor
mounting bracket using two #8-32 screws..
10. Refer to Fig. 22 and reconnect the wires to the
hopper drive board terminals.
11. Connect three pin plug from the potentiometer to
the hopper drive board J1. Refer to Fig. 28.
12. Install auger motor mounting bracket with auger
motorandhopperdriveboardtotherearoftheauger
motor mounting panel using four #8-32 screws.
13. Install hopper support plate using four #8-32
screws.
14. Install hopper assy (17).
42672 122209
36
SERVICE (cont.)
HOT/COLD SWITCH (Optional for FMD DBC-3)
Removal and Replacement:
1. Remove all wires from the switch terminals.
2. Remove the mounting nut on the front of the whip-
per motor mounting panel.
3. Remove the hot/cold switch from the rear of the
front panel and discard.
4. Reconnect the wires to the terminals on the rear of
the new switch.
5. Push new hot/cold switch through the hole on the
left side of the whipper motor mounting panel and
secure with mounting nut.
6. Refer to schematic wiring diagrams when recon-
necting the wires.
TAN to Main Harness
RED to Main Harness
P1684.40
FIG. 29 HOT/COLD SWITCH
Location:
WHI/YEL to
Cold Solenoid
The hot/cold switch is located on the left side of the
whipper motor mounting panel.
P1208
FIG. 30 HOT/COLD SWITCH TERMINALS
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the wires from the switch terminals.
3. With the switch in the “Cold” (upper) position check
for continuity between the center terminal and the
bottom terminal. With the switch in the “Hot”
(lower) position check for continuity between the
center terminal and the upper terminal.
If continuity is present as described, the hot/cold switch
is operating properly.
If continuity is not present as described, replace the
switch.
42672 122209
37
SERVICE (cont.)
INCREASE/DECREASE SWITCH (FMD-2,-2FD,-3,-4,-5)
FMD-3 shown
Removal and Replacement:
1. Open the dispenser door.
2. Removethefacenutsecuringtheincrease/decrease
switch to the whipper motor mounting panel.
3. Remove switch with wires attached from the back
side of the whipper motor mounting panel.
4. Disconnect the wires from the switch and discard
the switch.
5. Refer to schematic wiring diagrams when recon-
necting the wires.
6. Install new switch with wires attached through the
holeinthewhippermountingpanelandsecurewith
facenut.
P1666
FIG. 31 INCREASE/DECREASE SWITCH
P1208
FIG. 32 INCREASE/DECREASE SWITCH
Location:
TERMINALS
The increase/decrease switch is located on the lower
left front of the whipper motor mounting panel.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the wires from the switch terminals.
3. Checkforcontinuitybetweenthecenterterminaland
upper terminal with switch in the decrease position
(lower). Check for continuity between the center
terminal and the lower terminal with the switch in
the increase position (upper).
If continuity is present as described, the switch is
operating properly.
If continuity is not present as described, replace the
switch.
42672 122209
38
SERVICE (cont.)
LAMP HOLDER (all Models)
Removal and Replacement: (Refer to Fig. 33)
1. Open dispenser door (1).
FMD DBC-3 shown
1
2. Remove the five #6-32 screws securing lower door
panel (5) to the door (1) and remove cover.
3. Disconnect the door wiring harness from the door
interconnect wiring harness.
4. Remove five #6-32 screws securing the upper door
panel (4) to the door (1).
5. Remove the upper door cover (4), lamp (3), lamp
holders (2) and door wiring harness as an assem-
bly.
6. Disconnect the wires from the lamp holder to be
replaced from the door wiring harness.
7. Rotate lamp (3) 90° and remove from lamp holders
(2).
3
4
5
2
8. Remove the #6-32 screw securing the lamp holder
(2) to be removed, remove lamp holder (2) and
discard.
9. Install new lamp holder (2) and secure with a #6-32
screw.
10. Connect the wires on the new lamp holder to the
door wiring harness, black wire to red wire, and
white wire to blue wire.
6
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11. Install lamp (3) into lamp holders (2) and turn 90°
until the pins snap in place.
12. Install upper door panel (4), lamp (3), lamp holders
(2) and door wiring harness as an assembly using
five #6-32 screws.
13. Reconnect the plug on the door wiring harness
to the connector on the door interconnect wiring
harness.
14. Install the door lower panel (5) using five
#6-32 screws.
P1454.70
FIG. 33 LAMP HOLDERS
1. Door Assy
4. Upper Panel
5. Lower Panel
2. Lamp Holders
3. Lamp
6. Starter W/Socket
Location:
The lamp holders are located on the front of the upper
panel behind the display panel.
LAMP REPLACEMENT (Refer to Fig. 33)
1. Remove the outside window and display graphic.
2. Remove the two #4-40 screws securing the inside
window to the door and remove window.
3. Rotate lamp (3) 90° and remove from the lamp
holders (2).
4. Insert new lamp (3) into lamp holders (2) and turn
90° until the pins snap in place.
5. Using two #4-40 screws secure the inside window
to the door.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Remove upper door panel (4) and disconnect the
door wiring harness from the leads on the lamp
holders.
3. Remove lamp from lamp holders.
4. Check for continuity on each lead of the lamp hold-
ers.
If continuity is present as described, lamp holders are
operating properly.
If continuity is not present as described replace the
lamp holder.
6. Install outside window and slide display graphic
down between the inside window and the outside
window.
42672 122209
39
SERVICE (cont.)
Removal and Replacement (Refer to Fig. 33):
1. Open dispenser door assy (1)
LAMP STARTER and SOCKET
Location:
2. Remove the five #6-32 screws securing the door
lower panel (5) to the door assy (1).
3. Disconnect the leads on the starter socket from the
door wiring harness.
4. Remove lower door panel (5) and starter w/socket
(6) as assembly.
5. Compressthespringtabsonthesocketandremove
socket from the door bottom cover (5).
6. Rotate starter 90° and remove from the starter
socket.
7. Insert new starter (6) into socket and turn 90° until
the pins snap in place.
The lamp starter (6) is located inside the door assy (1)
on the top of the door lower panel (5).
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the starter leads from the door wiring
harness.
3. Remove lamp starter from starter socket.
4. Check for continuity on each lead of the starter
socket.
If continuity is present as described the starter socket
is operating properly.
If continuity is not present as described replace the
starter socket.
8. Install new socket by compressing spring tabs on
the socket and pushing the socket up through the
holeinthelowerdoorpanel(5)andreleasingspring
tabs.
9. Connect the sockets leads to the door wiring har-
ness.
10. Install door lower panel (5) with starter and starter
socket on door assy (1) using five #6-32 screws.
6. Remove starter (6) from starter socket.
7. Check for continuity across the pins on the bottom
of the starter (6).
If continuity is present as described, replace the
starter.
If continuity is not present as described, starter is
operating properly.
Note: If continuity tests are both as described and lamp
does not light, replace the starter.
42672 122209
40
SERVICE (cont.)
LEVEL CONTROL BOARD AND LEVEL PROBE (FMD-1 only)
4. Disconnect the dispenser from the power
source.
If voltage is present as described, proceed to #5.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check the dispenser wiring haness.
5. Reconnect the violet wire to terminal 1.
6. Carefully connect a piece of insulated jumper wire
to terminal 4. Keep the other end of this wire away
from any metal surface of the dispenser.
7. Check the voltage across terminals 1 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models,
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models,
c) 230 volts ac for two wire 230 volt models, after
a delay of approximately 5 seconds.
8. Touchthefreeendofjumperwiretothecomponent
bracket. The indication must be 0.
9. Move the jumper wire away from the component
bracket. The indication must again be:
P1665
a) 120 volts ac for two wire 120 volt models,
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models,
FIG. 34 LEVEL CONTROL BOARD AND PROBE
Location:
The level control board is located behind the lower
access panel mounted on the right side of the compo-
nent bracket.
The Level probe is located on the left center of the
tank lid just in front of the overflow tube.
c) 230 volts ac for two wire 230 volt models, after
a delay of approximately 5 seconds.
10. Disconnect the dispenser from the power source
and remove the jumper wire from terminal 4.
Ifvoltageispresentasdescribed,thelevelcontrolboard
is operating properly, proceed to #11.
If voltage is not present as described, replace the level
control board.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Remove the violet wire from terminal 1 & pink wire
from terminal 4 of the circuit board.
3. Check the voltage across terminals 2 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be:
11. Reconnect the pink wire to terminal 4.
12. Gently pull the probe out of the tank lid and inspect
for corrosion. Replace it if necessary.
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models.
c) 230 volts ac for two wire 230 volt models.
42672 122209
41
SERVICE (cont.)
LEVEL CONTROL BOARD AND LEVEL PROBE (cont.)
13. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
14. Check the voltage across terminals 1 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be:
Removal and Replacement:
1. Remove all wires from the level control board.
2. Remove two #8-32 keps nuts holding level control
board to right side of the component bracket.
3. Remove level control board and spacers.
4. Install the new level control board and spacers to
the right side of the component bracket using two
#8-32 keps nuts.
a) 120 volts ac for two wire 120 volt models,
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models,
c) 230 volts ac for two wire 230 volt models, after
a delay of approximately 5 seconds.
15. Move the probe’s flat end to the tank. The indication
must be 0.
16. Move the probe’s flat end away from the tank. The
indication should again be:
5. Refer to schematic wiring diagrams when recon-
necting the wires.
TI VIO to Inlet Solenoid Coil
T2 BLK to Main Harness
T3 WHI to Main Harness
T4 PNK to Probe
a) 120 volts ac for two wire 120 volt models,
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models,
c) 230 volts ac for two wire 230 volt models, after
a delay of approximately 5 seconds.
If voltage is present as described, reinstall the probe,
the level control board and level probe are operating
properly.
If voltage is not present as described, check the pink
probe wire for continuity.
P1671
FIG. 35 LEVEL BOARD TERMINALS
42672 122209
42
SERVICE (cont.)
LIMIT THERMOSTAT (all Models)
Ifcontinuityispresentasdescribed,thelimitthermostat
is operating properly.
FMD DBC-3 shown
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove all wires from the limit thermostat termi-
nals.
2. Carefully slide the limit thermostat out from under
the retaining clip and remove the limit thermo-
stat.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to schematic wiring diagrams when recon-
necting the wires.
P4102.40
FIG. 36 LIMIT THERMOSTAT
Location:
The limit thermostat is located in the center of the
tank lid.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect both black wires from the limit thermo-
P1800
FIG. 37 LIMIT THERMOSTAT TERMINALS
stat.
3. Check for continuity across the limit thermostat
terminals.
42672 122209
43
SERVICE (cont.)
OVERFLOW PROTECTION SWITCH (FMD-3,DBC-3-4,-5)
FMD DBC-3 shown
Removal and Replacement:
1. Disconnect the red leads from the overflow protec-
tion switch from the black wire and the blue wire
from the main harness.
2. Remove the nut beneath the copper overflow
cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that a gasket is in place around the
threaded switch stem.
NOTE - The magnets must be at the top of float and
there must be NO adjusting washers installed for the
overflow protection switch to operate properly.
5. Install the nut beneath the copper overflow cup. Be
sure not to overtighten.
6. Refer to schematic wiring diagrams when recon-
necting wires.
P4102.40
FIG. 38 OVERFLOW PROTECTION SWITCH
Location:
The overflow protection switch is located inside the
copper overflow cup on the left side of the tank.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Remove the wire nuts connecting the red wires
from the overflow protection switch to the black
wire and blue wire from the main harness.
3. Check for continuity across the safety overflow
switch red wires only until the plastic float is raised
and check that continuity returns when the plastic
float is again lowered.
P1212
FIG. 39 OVERFLOW PROTECTION
SWITCH LEADS
If continuity is present as described, reconnect the
red wires to the black wire and the blue wire from the
main harness.
If continuity is not present as described, replace the
overflow protection switch.
42672 122209
44
SERVICE (cont.)
RINSE /RUN SWITCH (all Models)
FMD DBC-3 shown
Removal and Replacement:
1. Open the dispenser door.
2. Remove the facenut securing the run/rinse switch
to the whipper motor mounting panel.
3. Remove switch with wires attached from the back
side of the whipper motor mounting panel.
4. Disconnect the wires from the switch and discard
the switch.
5. Refer to schematic wiring diagrams when recon-
necting the wires.
6. Install new switch with wires attached through
the hole in the whipper motor mounting panel and
secure with facenut.
P1684.40
FIG. 40 RINSE/RUN SWITCH
Location:
The rinse/run switch is located on the lower right side
of the whipper motor mounting panel.
FMD DBC-3,-2FD
P1456
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the wires from the switch terminals.
3. ModelsFMDDBC-2FDandDBC-3:Withtheswitch
in the “RUN” (lower) position check for continuity
between the center and the upper terminal. With
the switch in the “RINSE” (upper) position no
continuity should be present between center and
upper terminals.
Models FMD-2,-3,-4,-5: Check for continuity
between the center left terminal and left bottom
terminal, also between the center right terminal
and the right bottom terminal with the switch in the
rinse position (upper). Check for continuity across
the center left terminal and the top left terminal,
also between center right terminal and the top
right terminal with the switch in the run position
(lower). Continuity must not be present when the
switch is in the center position.
FMD-2,-3,-4,-5
P1644
FIG. 41 RINSE/RUN SWITCH TERMINALS
If continuity is present as described, the “RINSE/RUN”
switch is operating properly.
If continuity is not present as described, replace the
switch.
42672 122209
45
7. Check the solenoid valve for coil action. Connect the
dispenser to the power source. With “HOT/COLD”
switch in the “COLD” (upper) position press the left
dispense switch and listen carefully in the vicinity
of the solenoid valve for a “clicking” sound as the
coil magnet attracts.
SERVICE (cont.)
SOLENOID VALVE (COLD WATER - OPTIONAL for
FMD-2,-3,-4,-5)
FMD DBC-3 shown
8. Disconnect the dispenser from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before the solenoid valve or, the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Loosen the two screws securing the component
bracket to the dispenser base. Lift the component
bracket off of the base and move to the right.
2. Remove the white and white/yellow wires from the
solenoid valve.
3. Turn off the water supply to the dispenser.
4. Disconnect the water lines to and from the solenoid
valve.
P4102.40
FIG. 42 COLD WATER SOLENOID VALVE
Location:
The cold water solenoid valve is located on the left
side of the dispenser base just behind the component
bracket.
Test Procedures:
5. Loosen the two #8-32 screws and washers secur-
ing the solenoid mounting bracket to the base.
Remove solenoid bracket and solenoid valve as an
assembly.
1. Disconnect the dispenser from the power source.
2. Withthe“HOT/COLD”switchinthe“COLD”(upper)
position press any left dispense switch on front of
the door.
6. Remove the two #10-32 screws and lockwash-
ers securing the solenoid valve to the solenoid
bracket.
7. Using two #10-32 screws and lockwashers install
new solenoid valve on solenoid mounting brack-
et.
8. Install the solenoid valve and bracket on the dis-
penser base and tighten the two #8-32 screws.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to schematic wiring diagrams when recon-
necting the wires.
3. With a voltmeter check the voltage across the white
and white/yellow wires at the solenoid terminals.
Connect the dispenser to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power
source.
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to wiring
diagram and check dispenser wiring harness.
5. Disconnect the white and white/yellow wires from
the solenoid.
6. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
white and white/yellow wires to the solenoid.
If continuity is not present as described, replace the
solenoid valve.
P1215
FIG. 43 COLD WATER SOLENOID TERMINALS
42672 122209
46
6. Check the solenoid valve for coil action. Connect the
dispenser to the power source. With “RUN/RINSE”
switch in the “RINSE” (upper) position press the
appropriate dispense switch and listen carefully in
the vicinity of the solenoid valve for a “clicking”
sound as the coil magnet attracts.
SERVICE (cont.)
SOLENOID VALVES (DISPENSE) (all Models)
FMD DBC-3 shown
7. Disconnect the dispenser from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the tank water outlet before the solenoid valve
or, the solenoid valve may require inspection for wear,
and removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Remove the two wires from the solenoid valve.
2. Turn off the water supply to the dispenser.
3. Drain enough water from the tank (approximately
1.0 gallon) so the water level is below the dispense
valve mounting hole.
4. Disconnect the water line from the solenoid
valve.
P1637.40
FIG. 44 DISPENSE SOLENOID VALVES
Location:
The dispense solenoids are located on the side of
the tank.
5. Remove the #10-32 screw securing the solenoid
valve to side of the tank. Remove solenoid valve.
6. Using the #10-32 screw install new solenoid valve
on side of the tank
7. Push the water line onto the tube on bottom of
solenoid valve.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the two wires from the solenoid valve.
With the “RUN/RINSE” switch in the “RINSE” (up-
per)positionpresstheappropriatedispenseswitch
on front of the door.
3. With a voltmeter, check the voltage across the two
wires. Connect the dispenser to the power source.
The indication must be:
8. Refer to schematic wiring diagrams when recon-
necting the wires.
a) 120 volts ac for two wire 120 volt models, three
wire 120/208 volt, and 120/240 volt models.
b) 240 volts ac for two wire 240 volt models.
c) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power source,
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to Wiring
Diagrams and check dispenser wiring harness.
to Control Board
to Dispense Switch
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the two
wires to the solenoid.
If continuity is not present as described, replace the
solenoid valve.
P1645
FIG. 45 DISPENSE SOLENOID VALVE
TERMINALS
42672 122209
47
SERVICE (cont.)
HOT WATER DISPENSE SOLENOID VALVE (FMD-2FD,DBC-2FD,-3,DBC-3)
6. Check the solenoid valve for coil action. Connect
FMD DBC-3 shown
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound as the coil magnet attracts.
7. Disconnect the dispenser from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before the solenoid valve or the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
P4102
1. Remove the white and blue wires from the solenoid
valve.
2. Turn off the water supply to the dispenser.
3. Drain enough water from the tank (approximately
2.0gallons)sothewaterlevelisbelowthedispense
valve mounting hole.
FIG. 46 HOT WATER DISPENSE
SOLENOID VALVE
Location:
The hot water solenoid valve is located on the left side
of the tank.
4. Disconnect the water line from the solenoid
valve.
5. Loosen the #10-32 screw securing the solenoid
valve to side of the tank. Twist the solenoid valve
clockwise and remove solenoid valve.
6. Using the #10-32 screw install new solenoid valve
on side of the tank.
7. Push the water line onto the tube on bottom of
solenoid valve.
8. Refer to schematic wiring diagrams when recon-
necting the wires.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. With a voltmeter check the voltage across the white
and blue wires at the solenoid valve. Connect the
dispenser to the power source. The indication must
be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts for three wire 120/208 or 120/240 volt
models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagram and check dispenser wiring harness.
4. Disconnect the white and blue wires from the so-
lenoid valve.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
white and blue wires to the solenoid.
If continuity is not present as described, replace the
solenoid valve.
P1995.50
FIG. 47 HOT WATER DISPENSE
SOLENOID VALVE WIRING
42672 122209
48
SERVICE (cont.)
SOLENOID VALVE (INLET) (all Models)
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before the solenoid valve or, the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
FMD DBC-3 shown
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Remove the two wires from the solenoid valve.
2. Turn off the water supply to the dispenser.
3. Disconnect the water lines to and from the solenoid
valve.
4. Remove the two #8-32 screws securing the sole-
noid to the dispenser base. Remove solenoid.
5. Install new solenoid valve on the dispenser base
and secure with the two #8-32 screws.
6. Securely fasten the water lines to and from the
solenoid valve.
P4102.40
FIG. 48 INLET SOLENOID VALVE
7. Refer to Schematic Wiring Diagrams when recon-
necting the wires.
Location:
The inlet solenoid is located inside on the rear of
the dispenser base.
Early Models
Test Procedures:
1. Disconnect the dispenser from the power
source.
2. Disconnect the two wires from the solenoid
120V 1.2 kΩ
230V 3.84 kΩ
valve.
3. Check for continuity across the solenoid valve coil
terminals.
Late Models
If continuity is present as described, reconnect the two
wires to the solenoid.
If continuity is not present as described, replace the
solenoid valve.
120V 622 Ω
230V 1555 Ω
4. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound as the coil magnet attracts.
P1217
FIG. 49 INLET SOLENOID VALVE TERMINALS
5. Disconnect the dispenser from the power source.
42672 122209
49
4. Disconnecttheblackwireandthewhiteor redwire from
the tank heater terminals.
SERVICE (cont.)
TANK HEATER (all Models)
5. Disconnect the pink wire from the liquid level probe.
6. Disconnect the green wire from the tank.
7. Removethethermostatcapillarybulb/temperatureprobe
by firmly pulling up on the capillary at the tank lid. This
will disengage the grommet from the tank lid.
8. Remove the ten #8-32 nuts securing the tank lid to the
tank.
FMD DBC-3 shown
9. Remove tank lid with limit thermostat, liquid level probe
and tank heater as an assembly.
10. Remove the two hex nuts securing the tank heater to
the tank lid. Remove tank heater with gaskets and dis-
card.
11. Install new tank heater with gaskets on the tank lid and
secure with two hex nuts.
12. Install tank lid with limit thermostat, liquid level probe
and tank heater on the tank and secure with ten #8-32
hex nuts.
P4102.40
FIG. 50 TANK HEATER
13. Connect water inlet line to the tank lid.
14. Reconnect the black wires to limit thermostat, the pink
wire to the liquid level probe and the green wire to the
tank. Refer to the limit thermostat and the liquid level
board and probe sections in this manual when recon-
necting wires.
Location:
The tank heater is located inside the tank and secured to
the tank lid.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. With a voltmeter check the voltage across the black
and white wires 120 volt or 240 volt models or black
and red wires for 120/208 volt models or 120/240 volt
models. Connect the dispenser to the power source.
The indication must be:
15. Refer to Fig. 51 when reconnecting the wires to the tank
heater.
Resistance Values
7.8 - 9.2 ohms @ 68° - 75°F
15.3 - 17.9 ohms @ 68° - 75°F
120V
240V
a) 120 volts ac for two wire 120 volt models;
b) 208 volts ac for three wire 120/208 volt models.
c) 240 volts ac for three wire 120/240 volt models and
two wire 240 volt models.
WHI or RED to Main
Wiring Harness
BLK to Limit
Thermostat
d) 230 volts ac for two wire 230 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the dispenser
wiring diagram and check the wiring harness.
4. Disconnect the black wire and the white or red wire
from the tank heater terminals.
5. Check for continuity across the tank heater terminals.
If continuity is present as described, reconnect the wires,
the tank heater is operating properly.
If continuity is not present as described, replace the tank
heater.
NOTE - If the tank heater remains unable to heat, remove
and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Shut off water supply to the dispenser.
2. Disconnect the water supply tube on the tank lid.
3. Disconnect the black wires on the limit thermostat.
P1218
FIG. 51 TANK HEATER TERMINALS
42672 122209
50
SERVICE (cont.)
TANK HEATER RELAY (FMD-4,-5,120V Dispensers only)
6. With an ohmmeter, check for continuity between
the normally closed (NC-5) and common (COM-3)
terminals of the relay.
7. Place containers below any three dispense noz-
zles.
8. Connect the dispenser to the power source.
9. Simultaneously initiate dispenses at each of the
selected dispense stations while monitorintg con-
tinuity across the referenced terminals of the tank
heater relay. The indication must be open circuit.
1
J
2
J
4
J
3
J
1
J
2
J
4
J
3
J
If continuity is absent as described, the relay is func-
tioning correctly.
If continuity is present, replace the relay.
P4095
FIG. 52 TANK HEATER RELAY
Removal and Replacement:
Location:
1. Loosen the three #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
2. Pull component bracket out the front of the dis-
penser far enough so the tank heater relay can be
disconnected from the main wiring harness.
3 Disconnect the tank heater relay from the main
wiring harness.
4. Remove the two #8-32 screws securing the tank
heater relay to the rear of the component bracket.
5. Remove and discard the tank heater relay.
6. Install new tank heater relay on the rear of the
component bracket and secure with two #8-32
screws.
The tank heater relay is located behind the lower
front access cover, mounted on the left rear side of the
component bracket.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Place the tank heater switch in the “OFF” (upper)
position.
3. With an ohmmeter, check for continuity between
normally closed (NC-5) and common (COM-3)
terminals of the relay. The indication must be less
than 1 ohm.
7. Connect the tank heater relay to the main wiring
harness (see Fig. 53).
8. Place the component bracket into position and
tighten the three #8-32 screws.
If continuity is present as described, proceed to step
4.
If continuity is not present as described, replace the
relay.
4. With an ohmmeter, check the resistance across the
coil terminals (1 & 2) of the relay. The indication
must be approximately 4,000 ohms (4kΩ).
BLK from
Main Harness
If the resistance measures as described, proceed to
step 5.
Iftheresistancedoesnotmeasureasdescribed,replace
the relay.
BRN/BLK from
Main Harness
WHI from
Main Harness
No Connection
BLK from
Main Harness
5. Disconnectthewiresfromthenormallyclosed(NC-
5) and common (COM-3) terminals of the relay.
P2639
FIG. 53 TANK HEATER RELAY TERMINALS
42672 122209
51
SERVICE (cont.)
TANK HEATER SWITCH (all Models)
FMD DBC-3 shown
Removal and Replacement:
1. Refer to the hopper section in this manual and
remove the hopper assemblies and the hopper
support plate.
2. Remove the switch mounting nut on the front of
the front panel.
3. Remove switch with wires attached from the rear
of the front panel.
4. Remove the wires from the switch terminals and
discard switch.
5. Refer to schematic wiring diagrams when recon-
necting the wires.
5. Push new switch through hole in the front panel
and secure with face nut.
7. Refer to the hopper section in this manual and
install the hopper support plate and the hopper
assemblies.
P1684.40
FIG. 54 TANK HEATER SWITCH
Location:
The tank heater switch located is inside the dispenser
on the upper right of the whipper motor mounting
panel.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the black or white/brown wires from
the main harness.
FIG. 55 TANK HEATER SWITCH TERMINALSP1219
3. With the switch in the “ON” (lower) position check
for continuity between the center and the upper
terminal. With the switch in the “OFF” (upper)
position no continuity should be present between
center and upper terminals.
If continuity is present as described, the heater “ON/
OFF” switch is operating properly.
If continuity is not present as described, replace the
switch.
42672 122209
52
SERVICE (cont.)
TRANSFORMER (all Models)
5. Check the voltage between J1-1 and J1-2 on the
eight pin connector at the control board. Connect
the dispenser to the power source. The indication
must be 24 volts ac.
FMD DBC-3 shown
If voltage is present as described the transformer is
operating properly.
If voltage is not present as described, replace the
transformer.
Removal and Replacement:
1. Loosen the two #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
2. Pullcomponentbracketoutthefrontofthedispenser
far enough so the transformer connector can be
disconnected from the main wiring harness.
3 Disconnectthetransformerfourpinconnectorfrom
the four pin plug on the main wiring harness.
4. Removethetwo#6-32kepsnutssecuringthetrans-
former to the rear of the component bracket.
5. Remove and discard the transformer.
6. Installnewtransformerontherearofthecomponent
bracket and secure with two #6-32 keps nuts.
7. Connect the four pin connector on the transformer
to four pin plug on the main wiring harness.
8. Place the component bracket into position and
tighten the two #8-32 screws.
P1646
FIG. 56 TRANSFORMER
Location:
The transformer is located behind the lower
front access cover, mounted on the right rear side of
the component bracket.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnectthefourpinplugfromthemainharness
from the four pin connector on the transformer.
3 Check the voltage across black wire (pin 1) and
the
white wire (pin 2) on the plug from the main har-
ness. Connect the dispenser to power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts for three wire 120/208 and 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power source.
P1647
FIG. 57 TRANSFORMER TERMINALS
If voltage is present as described reconnect the plug
and the connector and proceed to #5.
Ifvoltageisnotpresentasdescribed, refertothewiring
diagrams and check the main wiring harness.
42672 122209
53
TRIAC MAPS for FMD
Q1
MOV1
Q2
Q5
MOV4
MOV2
MOV3
Q7
Bunn Part Number 28826.0006
Q1 & MOV1 controls
Q2 & MOV3 controls
Q5 & MOV4 controls
Q7 & MOV2 controls
Left Whipper Motor
@ J2-6
@ J2-3
@ J2-1
@ J2-5
Center Whipper Motor
Right Whipper Motor
Refill Valve
Q1
MOV1
Bunn Part Number 38739.0000
Q1
MOV1
Bunn Part Number 38739.0001
Q1 & MOV1 controls
Refill Valve
@ J4
42672 122209
54
SCHEMATIC WIRING DIAGRAM FMD-1
GRN
L2
N
L1
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
HEATER
SWITCH
RED-16 (3-WIRE MODELS)
WHI-16 (2-WIRE MODELS)
TANK HEATER
BLK-16
BLK-16
BLK-16
BLK-16
WHI
BLK
BLK
FAN
TANK INLET
VIO
HOPPER SPEED ADJUST
WHI
WHI
SOL
1
2
3
4
LIQUID
LEVEL
BOARD
BLK
PNK
GRN
RUN/RINSE
SWITCH
J1
PROBE
WHI
WHI/RED
RED
RED
RED
1 2
3
HOPPER
DRIVE
PCB
GRN
HOPPER
M
DISPENSE
WHIPPER
M
WHI
RED
WHI
RED
BLK
SOL
WHI
RED
BLK
BLK
FLUORESCENT
LAMP
BLU
BLK
BLK
DISPENSE SWITCH
BALLAST
BLK
RED
CHASSIS
GRN
1
4
1
DOOR
BLU
BLU
WHI
BLK
RED
RED
BLK
BLK
120 VOLTS A C - 2 WIRE
120/208-240 VOLTS AC - 3WIRE
SINGLE PHASE
STARTER
BLK
WHI
42672 122209
55
SCHEMATIC WIRING DIAGRAM FMD-1A
GRN
L2
L1
THERMAL
FUSE
BLK-16
THERMAL
FUSE
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
HEATER
SWITCH
TANK HEATER
WHI-16
WHI
BLK-16
BLK-16
BLK-16
BLK
BLK
FAN
TANK INLET
SOL
HOPPER SPEED ADJUST
VIO
WHI
WHI
1
2
3
4
LIQUID
LEVEL
BOARD
BLK
PNK
GRN
RUN/RINSE
SWITCH
J1
PROBE
WHI
WHI/RED
RED
RED
RED
1 2
3
HOPPER
DRIVE
PCB
GRN
HOPPER
M
DISPENSE
WHIPPER
M
WHI
RED
WHI
RED
BLK
SOL
WHI
RED
BLK
BLK
FLUORESCENT
LAMP
BLU
BLK
BLK
DISPENSE SWITCH
BALLAST
BLK
RED
CHASSIS
GRN
1
4
1
DOOR
BLU
BLU
WHI
BLK
RED
RED
BLK
BLK
230 VOLTS AC CE
2 WIRE + GND
SINGLE PHASE 50/60 HZ
STARTER
BLK
WHI
42672 122209
56
SCHEMATIC WIRING DIAGRAM FMD-2
GRN
L1
L2
N
TANK HEATER
SWITCH
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
RED-16 (3-WIRE MODELS)
WHI-16 (2-WIRE MODELS)
TANK HEATER
BLK-16
BLK-16
BLK-16
BLK-16
BLK-16
BLK
BLK
BLK
FAN
WHI
WHI
WHI WHI
WHI
VIO
WHI
BLK
J4-1
J4-4
TANK INLET
VIO
WHI
SOL
WHI/BLK
WHI/GRN
WHI
WHI/BLK
WHI/GRN
WHI
120V : 24V AC
TRANSFORMER
BLK
BLK
C
O
N
T
R
O
L
WHI/BLK
WHI/GRN
WHI
J3-1
WHI/ORN
WHI/RED
GRN
WHI/GRN
WHI/BLK
BLK
GRN
P
.
C
J3-6
J2-1
B
.
BRN/BLK
GRY
YEL
O
A
R
D
WHI
WHI
WHI/ORN
WHI/YEL
RED/BLK
WHI/RED
GRN
BLK
J2-5
RINSE/PROGRAM/
RUN SWITCH
GRN
GRN
PNK
GRY
RUN
GRN
BLK
J2-10
PGM
FLUORESCENT
INCREASE/
DECREASE
SWITCH
I
D
E
BLK
BLK
LAMP
YEL
N
C
RINSE
RUN
C
GRN
BALLAST
BRN/WHI
PGM
RINSE
BRN/BLK
RED/BLK
BRN/WHI
PROBE
GRN
RIGHT HOPPER
RIGHT DISPENSE
RIGHT WHIPPER
WHI/ORN
ORN
ORN
RED
BLK
WHI
WHI
GRN
GRN
M
M
SOL
LEFT DISPENSE
LEFT WHIPPER
LEFT HOPPER
WHI/RED
TAN
RED
WHI
RED
WHI
BLK
M
M
SOL
ORN
COLD DRINK OPTION (LEFT ONLY)
1
4
RED
RED
TAN
BLU
BLU
WHI
RED
RED
RED
SOL
JUMPER PLUG MUST BE
USED WHEN COLD
DRINK FEATURE NOT
INSTALLED
WHI
WHI
CHASSIS
120 VOLTS AC - 2 WIRE
120/208-240 VOLTS AC - 3 WIRE
SINGLE PHASE, 60 HZ
1
4
G
R
N
1
4
GRY
1
1
1
GRN/BLK
WHI/BLK
DOOR
PNK
"RINSE" L.E.D.
WHI
BLU
BLU
BLU
WHI
RED
BLK
BLK
1
STARTER
BLK
ORN
BLK
ORN
BLK
BLK/WHI
RED/WHI
BLU/WHI
RED
RED
BLK
WHI
LEFT DISPENSE SWITCH
RIGHT DISPENSE SWITCH
42672 122209
57
SCHEMATIC WIRING DIAGRAM FMD-2A
GRN
L1
L2
TANK HEATER
SWITCH
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
THERMAL
FUSE
BLK-16
THERMAL
FUSE
TANK HEATER
BLK-16
BLK-16
BLK-16
WHI-16
BLK-16
BLK
BLK
BLK
WHI
FAN
WHI WHI
WHI
WHI
VIO
WHI
BLK
J4-1
J4-4
TANK INLET
SOL
VIO
WHI
WHI/BLK
WHI/GRN
WHI
WHI/BLK
WHI/GRN
WHI
240V : 24V AC
TRANSFORMER
BLK
BLK
C
O
N
T
WHI/BLK
WHI/GRN
WHI
J3-1
WHI/ORN
WHI/RED
GRN
R
O
L
BLK
GRN
P
WHI/GRN
WHI/BLK
.
C
J3-6
J2-1
B
.
BRN/BLK
GRY
YEL
O
A
R
D
WHI
WHI
WHI/ORN
WHI/YEL
RED/BLK
WHI/RED
GRN
BLK
J2-5
RINSE/PROGRAM/
RUN SWITCH
GRN
GRN
PNK
GRY
RUN
GRN
BLK
J2-10
PGM
FLUORESCENT
INCREASE/
DECREASE
SWITCH
I
D
E
BLK BLK
LAMP
YEL
N
C
RINSE
RUN
C
GRN
BALLAST
WHI/BRN
PGM
RINSE
BRN/BLK
RED/BLK
WHI/BRN
PROBE
GRN
RIGHT HOPPER
RIGHT DISPENSE
RIGHT WHIPPER
WHI/ORN
ORN
ORN
RED
BLK
WHI
WHI
GRN
GRN
M
M
SOL
LEFT DISPENSE
LEFT WHIPPER
LEFT HOPPER
WHI/RED
TAN
RED
WHI
RED
WHI
BLK
M
M
SOL
ORN
COLD DRINK OPTION (LEFT ONLY)
1
4
RED
RED
TAN
BLU
BLU
WHI
RED
RED
RED
SOL
JUMPER PLUG MUST BE
USED WHEN COLD
DRINK FEATURE NOT
INSTALLED
WHI
WHI
CHASSIS
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE, 50 HZ
1
1
4
4
G
R
N
GRY
1
1
1
GRN/BLK
WHI/BLK
DOOR
PNK
"RINSE" L.E.D.
WHI
BLU
BLU
BLU
WHI
RED
BLK
BLK
1
STARTER
BLK
ORN
BLK
ORN
BLK
BLK/WHI
RED/WHI
BLU/WHI
RED
RED
BLK
WHI
LEFT DISPENSE SWITCH
RIGHT DISPENSE SWITCH
42672 122209
58
SCHEMATIC WIRING DIAGRAM FMD DBC-2
FREEZE DRIED W/HOT WATER
GRN
HOT WATER
WHI/VIO
WHI
SOL
RIGHT DISPENSE
RIGHT HOPPER
LEFT HOPPER
ORN
WHI
SOL
LEFT DISPENSE
RED
WHI
SOL
GRN/BLK
RED/WHI
GRN
CHASSIS
1
4
1
4
1
4
FLUORESCENT
LAMP
BALLAST
SWITCH UNIT ASSY
DOOR
1
1
BLU
BLU
WHI
BLK RED
BLK
BLK
STARTER
CENTER
LEFT
BLK RED
WHI BLU
M
D
M
D
S
M
S
M
HOT
WATER
L
G
L
G
STOP
42672 122209
59
SCHEMATIC WIRING DIAGRAM FMD-2FD
L1
L2
N
GRN
TANK HEATER
SWITCH
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
RED-16 (3-WIRE MODELS)
WHI-16 (2-WIRE MODELS)
TANK HEATER
BLK-16
BLK-16
WHI
BLK-16
BLK-16
BLK
BLK
FAN
WHI
WHI
TANK INLET
WHI
VIO
WHI
BLK
J4-1
J4-4
VIO
WHI
SOL
WHI/BLK
WHI/GRN
WHI
WHI/BLK
WHI/GRN
WHI
C
O
N
T
R
O
L
120V : 24V AC
TRANSFORMER
BLK
BLK
J3-1
WHI/ORN
WHI/RED
GRN
WHI/GRN
WHI/BLK
P
.
J3-6
J2-1
BLK
BLK
C
.
BRN/BLK
GRY
GRY
RUN
B
O
A
R
D
YEL
WHI/GRY
WHI/ORN
YEL
WHI/YEL
RINSE
J2-5
RED/BLK
WHI/RED
GRN
GRN
PNK
RINSE/RUN
SWITCH
GRN
WHI/GRY
DISP
J2-10
INCREASE/
DECREASE
SWITCH
GRN
BLK
I
D
BLK
BLK
BLK
BLU
FLUORESCENT
LAMP
BALLAST
N
C
E
C
GRN
GRN
PGM
DISP
BRN/WHI
PGM
PROBE
BRN/BLK
DISPENSE/PROGRAM
SWITCH
RED/BLK
GRN
WHI
WHI
RIGHT DISPENSE
RIGHT HOPPER
ORN
WHI
WHI/ORN
WHI/RED
RED
BLK
GRN
SOL
M
LEFT DISPENSE
LEFT HOPPER
RED
WHI
RED
BLK
GRN
GRN
SOL
HOT WATR
SOL
M
WHI/VIO
WHI
CHASSIS
WHI
BLU
BLU
BLU
WHI
BLK
RED
RED
1
1
4
G
R
N
1
4
BLK
BLK
GRY
1
STARTER
1
1
GRN/BLK
WHI/BLK
DOOR
BLK
WHI
PNK
"RINSE" L.E.D.
120 VOLTS AC - 2 WIRE
120/208-240 VOLTS AC - 3 WIRE
SINGLE PHASE, 60 HZ
ORN
BLK
ORN
BLK
BLK/WHI
RED/WHI
BLU/WHI
RED
BLK
ORN/BLK
HOT WATER
DISPENSE SWITCH
LEFT DISPENSE SWITCH
RIGHT DISPENSE SWITCH
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L1
N
L2
SCHEMATIC WIRING DIAGRAM FMD DBC-3
(WITH HOT WATER DISPENSE)
GREEN
BLK (2-WIRE MODELS)
MAIN ON/OFF SWITCH
(Late 3-wire Models only)
BLK (3-WIRE MODELS)
RED (3-WIRE MODELS)
WHI (2-WIRE MODELS)
120 VOLTS AC 2 WIRE + GND or
120/208-240 VOLTS AC - 3 WIRE + GND
SINGLE PHASE, 60 Hz
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SCHEMATIC WIRING DIAGRAM FMDA DBC-3
(WITH HOT WATER DISPENSE)
L1
L2
GRN/YEL
LIMIT
THERMOSTAT
TANK HEATER
SWITCH
CONTROL
THERMOSTAT
TANK HEATER
BLK-16
BLK-16
BLK-16
WHI
BLK-16
BLU/BLK
BLU/BLK
BLK
BLK
WHI
WHI
FAN
PNK
PROBE
GRN
BLK
BLK
WHI
WHI/GRN
WHI/BLK
WHI
120V : 24V AC
TRANSFORMER
WHI/GRN
WHI/BLK
PNK
WHI/GRN
WHI/BLK
J1-1
J1-5
TANK INLET
SOL
OVERFLOW SWITCH
BLU
RED
RED
VIO
WHI
WHI
GRN
WHI/ORN
WHI/BLU
WHI/RED
GRN
N.C.
J1-8
J2-1
WHI/VIO
BLK
ORN
WHI
BLU
J2-5
RED
C
O
N
T
R
O
L
RIGHT WHIPPER
RIGHT HOPPER
RED
M
RIGHT DISPENSE
WHI/BLU
WHI/ORN
WHI/RED
WHI/VIO
WHI/VIO
WHI
WHI
BLK
GRN
GRN
GRN
SOL
M
CENTER DISPENSE
CENTER WHIPPER
CENTER HOPPER
RED
ORN
WHI
ORN
WHI
BLK
M
M
SOL
LEFT WHIPPER
LEFT HOPPER
M
LEFT DISPENSE
P
C
RED
TAN
BLK
WHI
RED
WHI
M
SOL
B
O
A
R
D
COLD DRINK OPTION (LEFT ONLY)
HOT/COLD SWITCH
RED
RED
TAN
WHI
RED
RED
TAN
WHI/YEL
WHI
RED
RED
RED
SOL
JUMPER PLUG MUST BE
USED WHEN COLD
DRINK FEATURE NOT
INSTALLED
TAN
WHI
RED/BLK
BRN/BLK
WHI/BRN
WHI/VIO
WHI/BLU
ORN
J3-1
J3-5
BLU
HOT WATER
SOL
BLU
WHI
GRN
GRN
BLU
GRY
RED
J3-10
WHI/RED
WHI/ORN
BLK
RED-22
GRN-22
J4-1
J4-4
GRN-22
DISCONNECT
TO ENABLE
RINSE TIMER
FLOURESCENT
LAMP
AUX. CONTROL PC BOARD
BALLAST
SWITCH UNIT ASSY
GRN
CHASSIS
GRN/BLK
RED/WHI
RED
BLK
WHI/BLK
ORN
DOOR
BLU/WHI
BLU/BLK
RED/BLK
ORN/BLK
BLK/WHI
WHI/RED
BLU/RED
WHI
BLU
BLU
BLK
RED
BLK
BLK
STARTER
RED
BLU
BLK
WHI
CENTER
RIGHT
READY
LEFT
230 VOLTS AC - 2 WIRE
SINGLE PHASE
50/60 HZ
S
M
M
D
L
G
S
M
M
D
L
G
S
M
M
D
L
G
HOT
WATER
STOP
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SCHEMATIC WIRING DIAGRAM FMD-5A
L1
L2
GRN
WHI
BRN/BLK
WHI
J4-1
J4-4
CONTROL
THERMOSTAT
LIMIT
THERMOSTAT
TANK HEATER
SWITCH
THERMAL
FUSE
BLK-16
THERMAL
FUSE
C
O
N
T
K
BLK
TANK HEATER
BLK-16
BLK-16
BLK-16
WHI-16
BLK-16
K
R
O
L
FAN
M
BLK
WHI
WHI
BLK
BLK
C
I
J3-1
R
C
U
I
LAMP #1
BALLAST
BLK
BLK
RED
RED
BLK
BLK
BLK
BLK
BLK
LAMP #2
BALLAST
WHI/BLU
WHI/YEL
GRN
WHI/GRN
WHI/BLK
WHI
J4-1
J4-4
VIO
T
C
O
N
T
R
O
L
J3-5
J2-1
WHI
WHI/VIO
B
O
A
R
D
#
2
REFILL VALVE
WHI/BLK
LOAD
WHI/GRN
VIO
WHI
WHI
WHI/VIO
GRY
OVERFLOW PROTECTION SWITCH
RED RED
SOL
240V : 24V AC
TRANSFORMER
LINE
WHI
BLK
WHI/VIO
WHI/GRY
WHI/BLU
BLU/BLK
RED/BLK
WHI/YEL
WHI/ORN
C
WHI/ORN
WHI/RED
BRN/WHI
GRN
WHI/GRN
WHI/BLK
J2-5
J3-1
I
R
C
U
I
J3-5
J2-1
J2-5
WHI/BLK
T
J2-10
J1-1
B
O
A
R
D
#
1
WHI/VIO
GRY
WHI/GRY
WHI/RED
TAN
RED/BLK
WHI/BLK
WHI/ORN
GRN
WHI/RED
J1-4
PNK
J2-10
J1-1
I
N
C
D
INCREASE/
DECREASE
SWITCH
HOPPER #1
HOPPER #2
WHI/RED RED
HOPPER #3
HOPPER #4
WHI/YEL RED
M
HOPPER #5
M
E
C
BRN/WHI
RED
BLK
M
BLK
WHI/ORN RED
BLK
BLK
WHI/BLU RED
BLK
M
M
J1-4
GRN
STATION #1
WHIPPER
STATION #2
WHIPPER
STATION #3
WHIPPER
STATION #4
WHIPPER
STATION #5
WHIPPER
PROBE
RINSE/PROGRAM/
RUN SWITCH
BLK
BLK
M
BLK
BLK
WHI
BLK
BLK
WHI
BLK
YEL
BLK
BLK
BLU
BLK
M
M
M
M
WHI/GRY
RINSE
STATION #1
DISPENSE
VALVE
STATION #2
DISPENSE
VALVE
STATION #3
DISPENSE
VALVE
STATION #4
DISPENSE
VALVE
STATION #5
DISPENSE
VALVE
GRN
BLK
PGM
GRY
RUN
BRN/BLK
RINSE
TAN
WHI
SOL
RED
ORN
WHI
WHI
PGM
RUN
SOL
SOL
SOL
SOL
BRN/BLK
COLD DRINK OPTION (LEFT ONLY)
HOT/COLD SWITCH
1
4
WHI/YEL
BRN
BRN
TAN
WHI
RED
RED
TAN
WHI
COLD
JUMPER PLUG MUST BE
USED WHEN COLD
DRINK FEATURE NOT
INSTALLED
RED
RED
RED
SOL
HOT
PNK
1
1
6
1
6
1
4
RED/WHI
BLU/WHI
GRY
1
"RINSE" #1-3 L.E.D.
PNK
RED/GRN
ORN/RED
GRY
"RINSE" #4 & 5 L.E.D.
1
1
2
3
4
5
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE, 50/60HZ
WHI/RED
BLK
WHI/RED
BLK
RED
RED/BLK
WHI/RED
BLK
WHI/RED
BLK
GRN/WHI
GRN/BLK
WHI/RED
BLK
BLU
BLU/BLK
BLK/WHI
WHI/BLK
ORN
ORN/BLK
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