Stulz CeilAir CW - Page 73

73OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
4.2 TROUBLESHOOTING
Symptom Probable Cause Recommendation
Condenser Pressure
Too Low
a. Loss of refrigerant (indicated by
bubbles in sight glass)
Locate and repair leak. Recharge system.
b. Condenser fan controls not set. Adjust or repair controls.
c. Water regulating valve adjusted too
low.
R407C: Readjust to 320 psig (2.20 MPa).
R410A: Readjust to 440 psig (3.03 MPa).
Noisy Compressor a. Expansion valve stuck in open
position (abnormally cold suction line).
Ensure feeder bulb is tight on suction line.
Check operation and superheat.
b. Worn or scarred compressor
bearings.
Replace compressor.
c. Liquid slugging. System overcharged. Reclaim excess
refrigerant.
d. Scroll compressor not properly
phased.
Phase correctly at main power source. Do
not rewire compressor.
Compressor Fails to
Start
a. Temperature set point too high. Adjust to desired temperature.
b. Compressor internal overload
protector is open.
Check compressor for short circuit or
ground.
c. Complete loss of refrigerant charge
(low pressure safety switch).
Locate and repair leak. Recharge system.
d. Condenser pressure too high (high
pressure safety switch).
Check condenser for obstructions.
e. Condensate switch open. 1. Ensure unit is level.
2. Check that condensate pan is draining
properly. Clear obstructions.
System Short of
Capacity
a. Low refrigerant (indicated by
bubbles in sight glass)
Check for leaks. Repair and recharge
system.
b. Expansion valve stuck or obstructed
(short cycling or continuous running).
Remove valve and clear obstruction or
replace valve.
c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.
d. Reduced airflow. Check belt tension, check filters, and clear
evaporator coil of debris.
Table 14. Troubleshooting Table, Continued