Stulz FLAIR series, Installation, Operation And Maintanance Manual

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FLAiR Series Installation, Operation & Maintenance Manual
(©Aug, 2007)
Air Technology Systems, Inc.
4-5
SYMPTOM PROBABLE CAUSE RECOMMENDATION
Compressor Fails to Start e. Minimum off time has not expired Wait for time to expire
System Short of Capacity a. Low refrigerant (indicated by bubbles Check for leaks Repair and recharge
in sight glass). system.
b. Expansion valve stuck or obstructed Remove valve and clear obstruction or
(short cycling or continuous running). replace valve.
c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.
d. Reduced airflow. Check belt tension, filters and
evaporator coil.
Compressor Short Cycles a. Low line voltage causing Check power source for cause of low
compressor to overheat. line voltage.
b. Dirty or iced-over evaporator coil. Defrost and/or clean coil.
c. Reduced airflow. Check filter and belt tension (when
applicable).
d. Lack of refrigerant Check for leak. Repair and recharge
system.
e. Short cycling of conditioned air. 1. Supply and/or return grilles are
incorrectly oriented. Reorient.
2. Supply and return grilles are too close
together. Move further apart.
3. Insufficient heat load. Add temporary
heat load to compensate.
f. Remote temperature sensor is Check for supply registers that may
improperly located. be too close to the remote temperature
sensor. Relocate if necessary.
Heater Inoperative a. Fuses blown or circuit breaker Check for short circuit, replace fuse or
tripped. re-set circuit breaker
b. Temperature setpoint too low. Increase temperature setpoint.
c. Overheat switch open. (Insufficient Check for dirty filters or obstructions that
air across heater elements.) may reduce air flow. Correct or replace
as needed.
d. Manual reset overheat safety Reset manual overheat safety switch
switch tripped. (See item immediately above).
e. Heater element burned out. Check continuity with an ohmmeter.
Replace heater element.
(cont.)