Cooling Troubleshooting - Carrier 48/50PD05 User Manual

ALARM
OR
DESCRIPTION
ALERT
NUMBER
Loss of Communication with the Capacity
T178
Control Board
Loss of communication with the Economizer
T179
Control Board
Loss of communication with the Economizer
T180
Actuator
A200 Linkage Timeout Error --- Comm Failure
A404 Fire Shutdown
T408 Dirty Filter
Fan Status Switch ON, Fan Contactor OFF
T409
Fan Status Switch OFF, Fan Contactor ON
Economizer Damper Actuator Out of
Calibration
Economizer Damper Actuator Torque Above
Load Limit
Economizer Damper Actuator Hunting
Excessively
T414
Economizer Damper Stuck or Jammed
Economizer Damper Actuator Mechanical
Failure
Economizer Damper Actuator Direction
Switch Wrong
T415 IAQ Input Out of Range
T416 OAQ Input Out of Range
LEGEND
ECB - - Economizer Control Board
IGC - - Integrated Gas Controller
MBB - - Main Base Board
OAT - - Outdoor- -Air Thermistor

Cooling Troubleshooting

Use the Scrolling Marquee display or a CCN device to view the
cooling status display and the cooling diagnostic display (see
Appendix A) for information on the cooling operation. Check the
current alarms and alarm history for any cooling alarm codes and
correct any causes. (See Table 9.)
Verify any unique control configurations per installed site
requirements or accessories. If alarms conditions are corrected and
cleared, operation of the compressors and fans may be verified by
using the Service Test mode. (See Table 5.) See Table 9 for general
cooling service analysis.
Table 8 — ComfortLink™ Alarm Codes (cont)
ACTION TAKEN BY
CONTROL
Unit shutdown ---HVAC
disable
No economizer
operation
No economizer
operation
No Linkage Operation
fall back to local SPT
Unit Shutdown
Alert Generated
If IDF.F = Yes, then Unit
Shutdown
If IDF.F = Yes, then Unit
Shutdown
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
No IAQ Operations
No OAQ Operations
30
RESET
PROBABLE CAUSE
METHOD
Communication wiring problem with AUX1 or faulty
Automatic
MBB, ECB, or AUX1
Communication wiring problem with ECB or faulty
Automatic
MBB, ECB, or AUX1
Automatic Communication wiring problem with actuator.
Received a table write from Linkage before, now not
Automatic
receiving any linked commands
Automatic Smoke detected by smoke detector
Automatic Dirty Filter
If IDF.F =
YES, then
Manual, Bad Fan Status Switch. Configuration incorrect.
otherwise
automatic
If IDF.F =
YES, then
Tripped Circuit Breaker. Broken belt. Bad indoor fan
Manual,
motor. Configuration incorrect. Bad fan status switch.
otherwise
automatic
Calibrate economizer (E.CAL). If problem still exist
Automatic
then determine what is limiting economizer rotation.
Automatic Actuator load too high. Check damper load.
Automatic Damper position changing too quickly.
No economizer motion. Check damper blades, gears,
Automatic
and actuator.
Automatic Check actuator and replace if necessary.
Automatic Actuator direction control switch (CCW, CW) wrong.
Bad sensor, bad wiring, or sensor configured
Automatic
incorrectly.
Bad sensor, bad wiring, or sensor configured
Automatic
incorrectly.