Carrier Air Conditioner 48 50P030 100 User Manual

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  
 
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
 
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 ComfortLinkController —  
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  
 

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