48/50A020-060, 48/50P030-100,
48/50Z030-105
CO Sensor Accessory
2
Installation Start-Up and
Service Instructions
Part No. CRCBDIOX002A00
The unit utilizes a 4 to 20-mA analog signal. The ComfortLink
CONTENTS
controller uses this signal to control the economizer damper
position and ensure adequate level of outside air in the
building. This is one of several approved methods of control-
ling the indoor-air quality (IAQ) in a building and meets the
requirements of local building codes and ASHRAE (American
Society of Heating, Refrigerating and Air Conditioning
Engineers) Standard 62. The control sensor features a mem-
brane-covered waveguide and sample chamber that produces
stable, reliable, and highly accurate carbon dioxide readings.
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Check Package Contents. . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Configuring the ComfortLink™ Controller. . . . . . . . 4
Verification and Calibration . . . . . . . . . . . . . . . . . . . . . . 4
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The sensor is self-calibrating and should not need to be
manually calibrated.
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Check Package Contents — Remove accessory pack-
aging and inspect shipment for damage. If any damage is found,
file a claim with the shipping agent immediately. If any item is
missing or any part does not assemble properly, notify your
Carrier distributor. Table 1 lists the accessory package contents.
SAFETY CONSIDERATIONS
Installing, starting up and servicing HVAC (heating, ventila-
tion, and air conditioning) equipment can be hazardous due to
system pressures, electrical components and equipment
locations.
Table 1 — Accessory Package Contents
Only trained, qualified installers and service technicians
should install, start up and service this equipment.
When working on HVAC equipment, observe precautions
in the literature, labels attached to the equipment and any other
safety precautions that apply. Follow all safety codes. Wear
safety glasses and work gloves. Use care when handling and
installing the sensor.
ITEM
QUANTITY
CO2 Sensor (Part No. HH99ZZ019)
Bracket (48/50A)
No. 8-18 x 1/4 Screw
1/4 AB-14 x 5/8 Screw
Electrical Harness*
1
1
2
2
1
1
Bracket (48/50P,48/50Z)
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety alert
*Do not use the electrical harness provided in this kit for 48/50P and
48/50Z units.
symbol
. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies a hazard which could result in personal
injury or death. CAUTION is used to identify unsafe practices
which would result in minor personal injury or property
damage.
WARNING
Prior to installation of this accessory, make sure all power
is disconnected to the unit and locked out. Failure to dis-
connect power supply prior to servicing may result in seri-
ous injury.
GENERAL
The CO sensor (Fig. 1) is designed to monitor carbon
2
dioxide (CO ) levels in the return air and interface with the
2
SIDE VIEW
FRONT VIEW
MOUNTING PLATE
ComfortLink™ controller on the rooftop air-conditioning unit.
The sensor perceives CO levels in the 0 to 2,000 parts per
2
Fig. 1 — CO Sensor
2
million (ppm) range and provides outputs indicating this level.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480064-01 Printed in U.S.A. Form 48/50-73SI Pg 1 8-09 Replaces: 48/50A-4SI
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PL18
(48/50A
ONLY)
to
CO SENSOR
2
AND BRACKET
HOLES MUST LINE-UP
BRACKET
(48/50A)
SENSOR MOUNTING PLATE
Fig. 6 — CO Bracket for 48/50P030-050 and
2
COVER SCREW
SENSOR COVER
48/50Z030-050 Units Side View (Economizer with
Power Exhaust)
Fig. 3 — CO Sensor Assembly
2
CO SENSOR
2
AND BRACKET
Fig. 4 — Harness Wiring Connections
Fig. 7 — CO Bracket for 48/50P030-050 and
2
48/50Z030-050 Units (Economizer Only)
CO SENSOR
2
AND
BRACKET
CO SENSOR
2
AND BRACKET
Fig. 5 — CO Bracket for 48/50P030-050 and
2
48/50Z030-050 Units (Economizer with Power
Exhaust)
Fig. 8 — CO Bracket for 48/50P030-050 and
2
48/50Z030-050 Units (No Economizer or Power
Exhaust)
3
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START-UP
After applying power, the CO sensor will enter a warm-up
2
mode. Warm-up duration will be from 1 to 10 minutes. The
warm-up duration will be shorter in warmer temperatures and
longer in cooler temperatures. During warm-up, the signal
output will be 4 mA. Once the unit has warmed up, the voltage
or current output will be set up to indicate the CO level. The
2
display will show a steady reading 1 minute later.
Configuring the ComfortLink™ Controller —
CO SENSOR
2
AND BRACKET
The CO sensor is defaulted to provide 4 mA at 0 ppm and
2
20 mA at 2000 ppm. If a different range is necessary, contact
Carrier Application Engineering to reconfigure the sensor. If
the sensor is reconfigured, the mA range on the ComfortLink
controller must be configured to match the new values. Refer
to Controls and Troubleshooting Guide for configuration
details.
Sensor Self Calibration — The CO sensors employ a
2
self-calibration system. The system eliminates the need for
Fig. 9 — CO Bracket for 48/50P055-100 and
2
manual calibration in applications where the indoor CO level
2
48/50Z055-105 Units (Economizer with Power
drops to outside levels during unoccupied periods (e.g., during
evening hours). A special software routine in the sensor re-
members the background readings for 14 consecutive eve-
nings, calculates if there is a sensor drift, and then corrects for
it.
Exhaust)
NOTE: This only applies when used in typical indoor or ambi-
ent air conditions. Consult Carrier application engineering if
other gases or corrosive agents are part of the application
environment.
SERVICE
CO SENSOR
2
AND BRACKET
Cleaning — The controller is a rugged and lightweight unit
that requires very little maintenance. Clean external surfaces
periodically with a dampened cloth.
TROUBLESHOOTING
The following occurrences may indicate abnormal opera-
tion, caused primarily by power input fluctuations, surges, or
spikes.
• The unit remains in warm-up mode for more than
10 minutes.
Fig. 10 — CO Bracket for 48/50P055-100 and
2
• The LED glows with no pulse.
48/50Z055-105 Units (Economizer Only)
• CO indication (display numbers or signal output) is
2
frozen.
• Numbers on the display change continuously for longer
than 1 minute.
Normal operation can usually be restored by removing
power, shutting down the unit for at least 15 seconds, then
reconnecting power. The unit should warm up, as described
above, then return to normal operation. If the situation
continues, remove and replace the sensor.
CO SENSOR
2
AND BRACKET
Fig. 11 — CO Bracket for 48/50P055-100 and
2
48/50Z055-105 Units (No Economizer or Power
Exhaust)
Copyright 2009 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480064-01 Printed in U.S.A. Form 48/50-73SI Pg 4 8-09 Replaces: 48/50A-4SI
Download from Www.Somanuals.com. All Manuals Search And Download.
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