Carrier 48/50P030-100 specifications Start-Up, Service, Troubleshooting

CO2 SENSOR

AND BRACKET

Fig. 9 — CO2 Bracket for 48/50P055-100 and 48/50Z055-105 Units (Economizer with Power Exhaust)

CO2 SENSOR

AND BRACKET

Fig. 10 — CO2 Bracket for 48/50P055-100 and

48/50Z055-105 Units (Economizer Only)

CO2 SENSOR

AND BRACKET

Fig. 11 — CO2 Bracket for 48/50P055-100 and 48/50Z055-105 Units (No Economizer or Power Exhaust)

Copyright 2009 Carrier Corporation

START-UP

After applying power, the CO2 sensor will enter a warm-up 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 CO2 level. The display will show a steady reading 1 minute later.

Configuring the ComfortLink™ Controller —

The CO2 sensor is defaulted to provide 4 mA at 0 ppm and 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 CO2 sensors employ a self-calibration system. The system eliminates the need for manual calibration in applications where the indoor CO2 level 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.

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

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.

•The LED glows with no pulse.

•CO2 indication (display numbers or signal output) is 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.

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