47D40-801
Demand Defrost Control
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 47D40-801 control is a microprocessor-based demand
defrost controller intended for Rheem heat pump systems.
This controller uses basic differential temperature means to
detect degradation of system performance due to ice build-up
on the outdoor coil. The controller uses “self-calibrating” prin-
ciples to calibrate to the heat pump system. The defrosting is
performed by reversing the refrigerant direction of flow.
The 47D40-801 is meant to replace the following controllers
in Rheem heat pump systems:
47-21517-16
47-21517-17
47-21517-18
47-21517-23
47-21517-24
47-21517-11
47-21517-14
47-21517-13
47-21517-82
47-21517-88
47-102685-01
47-102685-03
47-102684-01
47-102684-03
47-102684-83
DDL-013102-1RH
DDL-017002-2RH
DDL-017102-1RH
DDL-017702-1RH
DDL-117702-3RH
DDL-013002-0RH
DDL-013002-1RH
47D40-801
PRECAUTIONS
WARNING
• Topreventelectricalshockand/orequipmentdamage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
CAUTION
• This control is intended only for Rheem heat pump
systems.
!
!
• Replace 47D40-801 control as a unit - no user service-
able parts.
• This control is not intended for use in locations where
it may come in direct contact with water. Suitable
protectionsmustbeprovidedtoshieldthecontrolfrom
exposure to water (dripping, spraying, rain, etc.)
If in doubt about whether your wiring is millivolt, line or low
voltage, have it inspected by a qualified heating and air
conditioning contractor or licensed electrician.
• Label all wires prior to disconnection when servicing
controls.Wiring errors can cause improper or loss of
heat pump operation and/or shock hazard.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
• Followinginstallationorreplacement,followappliance
manufacturer’s recommended installation/service
instructions to insure proper operation.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could
cause the control to malfunction.
• Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
CONTENTS
Description................................................................ 1
Precautions .............................................................. 1
Specifications ........................................................... 2
Operation.................................................................. 2
Installation ................................................................ 3
PART NO. 37-7200A
1039
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INSTALLATION
On some units, the Outdoor Ambient Temperature (OAT) and
Outdoor Coil Temperature (OCT) sensors may be attached
permanently to the controller. The 47D40-801 includes
replacement OAT and OCT sensors that plug onto the 2- and
3-pin connectors on the controller board.
NOTE
All wiring should be installed according to local and national
electrical codes and ordinances.
The 47D40-801 control may be mounted on any convenient
surface using the four standoffs provided.
Before removing the old controller, note the location of the
OCT sensor on the outdoor coil. The new sensor should
be attached to the coil in the same location, or as close as
possible. The OAT sensor is typically 24-48” long, although
some controllers have the sensor on the board. Placement of
the OAT sensor is not as critical as the OCT sensor, but both
sensors are required for the controller to operate.
The control must be secured to an area that will experience
a minimum of vibration and remain below the maximum
ambient temperature rating of 150o F. The control is approved
for minimum ambient temperatures of -40o F.
Any orientation is acceptable.
Four metal standoffs are used to support and mount the
control into the unit.
Refer to the wiring diagram and wiring table when
connecting the 47D40-801 control to other components of
the system.
UL approved, 105o C rated 18 gauge min., stranded 2/64”
thick insulation wire is recommended for all low voltage safety
circuit connections.
Board size is 3.375 in. x 3.625 in. and requires 1 inch of
headroom (not including mounting).
Typical System Wiring Table
47D40
Terminal
C
RV
UL approved, 105o C rated 16 gauge min., stranded 2/64”
thick insulation wire is recommended for all line voltage
connections.
Type
System Component Connection
Reversing valve common
Reversing valve output
Compressor contactor coil
Compressor call output
Common, 24VAC return
Defrost output
Compressor call input
Heating mode signal input
24VAC input
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
Following installation or replacement, follow appliance
manufacturer’s recommended installation or service
instructions to insure proper operation.
CC
Yout
C (2)
D
Y
B
R (2)
Fan (2)
OAT
OCT
Outdoor fan control
2-pin connector Outdoor ambient temperature sensor
3-pin connector Outdoor coil temperature sensor
C
COMPRESSOR
OUTDOOR
FAN MOTOR
HERM
FAN
R
C
S
R
S
C
RUN CAPACITOR
CC
COMPRESSOR
CONTACTOR
TO THERMOSTAT
L1
L2
D
Y
C
R
B
FAN
FAN
Yout
CC
RV
C
OAT
OCT
REVERSING
VALVE
RV
Legend
Low Voltage
Line Voltage
Demand Defrost Control
Internal Control
Tracing
Fig 1.Typical System Wiring Diagram
3
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White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
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