Stulz FLAIR series, Installation, Operation And Maintanance Manual

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FLAiR Series Installation, Operation & Maintenance Manual
(©Aug, 2007)
Air Technology Systems, Inc.
4-3
SYMPTOM PROBABLE CAUSE RECOMMENDATION
Water/Glycol Valve fails c. Actuator failed. Replace actuator.
Evaporator Coil Ices a. Low airflow. 1. Check filters. Replace as needed.
2. Check for and clear any obstructions
across or in the (supply) discharge
airstream.
3. Check correct rotation of evaporator
blower.
4. Check clearance height of raised floor.
b. Temperature setting too low Increase temperature setpoint.
(68°F min.).
c. Discharge air short cycling Check discharge grille orientation.
back to return.
d. Low refrigerant charge. Find leak, repair and recharge system.
Blower Fails to Start a. Power failure. Check main voltage power source input
cable.
b. Control transformer circuit Check for short circuit or ground fault. If
breaker tripped. none, reset circuit breaker.
c. Defective contactor. Repair or replace.
d. Condensate switch open. 1. Ensure unit is level
2. Check that condensate pan is draining
properly. Clear obstructions.
e. Motor circuit controller tripped. Reset motor circuit controller and check
amperage of motor. Compare to setting
on motor circuit controller and adjust to
FLA.
Control is Erratic Wiring improperly connected or broken. Check wiring against schematic diagram.
a. Condenser air intake is blocked. Remove debris and clean condenser.
b. Overcharge of refrigerant. Reclaim excess refrigerant from system.
c. Low water/glycol flow to Determine cause and fix.
condenser.
d. Condenser fan not operating. Check pressure/temperature operating
switches and motor. Replace as needed.
e. Non-condensable gas or air in the Recover system, vacuum to 50 microns
system. and recharge. Install new drier/strainer.
to Close (cont.)
Condenser Pressure
too High