STULZ CyberRow DX Series Installation, Operation & Maintenance Manual
5-4
SYMPTOM
PROBABLE
CAUSE
RECOMMENDATION
Compressor Fails to Start
c. Complete loss of refrigerant charge
Locate and repair leak. Recharge system.
(cont.)
(low pressure safety switch tripped).
d. Condenser pressure too high
Check condenser for obstructions.
(high pressure safety switch tripped).
e. Minimum off time has not expired.
Wait for time to expire.
System Short of Capacity
a. Temperature setting too high.
Increase temperature setpoint.
b. Discharge air short cycling
Check air barrier between hot/cold aisles.
back to return.
c. Low airfl ow.
1. Check fi lters. Replace as needed.
2. Check for and clear any obstructions
across or in the (supply) discharge air
stream. Clear coil fi ns of debris.
3. Check evaporator coil for bent fi ns.
4. Check correct rotation of fans.
d. Low refrigerant (indicated by bubbles
Check for leaks Repair and recharge
in sight glass).
system.
e. Expansion valve stuck or obstructed
Remove valve and clear obstruction or
(short cycling or continuous running).
replace valve.
f. Clogged drier/strainer (feels cold).
Replace with new drier/ strainer.
System Short of Capacity
a. Low Water-Water/Glycol fl ow.
1. Check for leaks. Repair and recharge
(CSR-W & CRS-G Units)
system.
2. Check for obstructions in supply/return
lines.
3. Check for clogged strainer
(if applicable).
b. Supply water temperature too high.
Check chilled water supply.
Water-Water/Glycol Valve
a. Temperature setpoint too high.
Adjust to correct temperature setting.
Fails to Open or Close
b. No control power to the valve.
Valve actuator is wired incorrectly. Check
wiring diagram and rewire if required.
c. Actuator failed.
Replace actuator.
Summary of Contents for CyberRow DX CRS-042-G
Page 94: ......
