Carrier 48/50P030-100 START-UP, Configuring the ComfortLink Controller , Sensor Self Calibration , SERVICE Cleaning , TROUBLESHOOTING

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

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.

•CO

2 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.

CO2 SENSOR

AND BRACKET

CO2 SENSOR

AND BRACKET

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

48/50Z055-105 Units (Economizer Only)

Fig. 11 — CO2 Bracket for 48/50P055-100 and

48/50Z055-105 Units (No Economizer or Power

Exhaust)

Fig. 9 — CO2 Bracket for 48/50P055-100 and

48/50Z055-105 Units (Economizer with Power

Exhaust)

CO2 SENSOR

AND BRACKET