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Troubleshooting
Table 7.
Troubleshooting (continued)
SYMPTOM
Condenser Pressure Too High (cont.)
Condenser Pressure too Low
Noisy Compressor
Compressor Fails to Start
System Short of Capacity
Compressor Short Cycles
Water- Water/Glycol Valve Fails to Open or Close a. Temperature set point too high or too low.
44
PROBABLE CAUSE
d. Condenser fan not operating.
e. Control pressure set too high
f. Water/glycol temperature too high.
g. Flow of water/glycol too low.
h. Water/glycol solution not mixed prior to
adding to system.
a. Loss of refrigerant (indicated by bubbles in
sight glass).
b. Condenser fan controls not set properly.
c. Control pressure set too low.
a. Expansion valve stuck in open position
(abnormally cold suction line).
b. Worn or scarred compressor bearings.
c. Liquid slugging.
d. Scroll compressor not properly phased.
a. Temperature set point too high.
b. Compressor internal protector is open.
c. Complete loss of refrigerant charge (low
pressure safety switch).
d. Condenser pressure too high (high pressure
safety switch).
e. Minimum off time has not expired.
a. Low refrigerant (indicated by bubbles in sight
glass).
b. Expansion valve stuck or obstructed (short
cycling or continuous running).
c. Clogged drier/strainer (feels cold).
d. Reduced airflow.
a. Low line voltage causing compressor to
overheat.
b. Dirty or iced-over evaporator coil.
c. Reduced airflow.
d. Lack of refrigerant.
e. Short circuiting of conditioned air.
f. Return temperature sensor is improperly
located.
b. No control power to the valve.
RECOMMENDATION
Check pressure/temperature operating
switches and motor. Replace as needed.
Adjust setting to obtain correct pressure.
Check flow and operation of drycooler.
1.
Check glycol solution level and
concentration.
2.
Valves not open or partially open. Repair or
replace as needed.
3.
Air in system - bleed system.
4.
Check all strainers and clean if needed.
Remove solution and premix. Refill system.
Locate and repair leak. Recharge system.
Adjust or repair controls.
Readjust to 440 psig.
Ensure feeder bulb is tight on suction line. Check
operation and superheat.
Replace compressor.
System overcharged. Reclaim excess
refrigerant.
Phase correctly at main power source.
Do not rewire compressor.
Adjust to desired temperature.
Check compressor for short circuit or ground.
Locate and repair leak. Recharge system.
Check condenser for obstructions.
Wait for time to expire.
Check for leaks. Repair and recharge system.
Remove valve and clear obstruction or replace
valve.
Replace with new drier/ strainer.
Check fan speed setting, filters and evaporator
coil.
Check power source for cause of low line
voltage.
Defrost and/or clean coil.
Check air filters and supply fan speed setting
(when applicable).
Check for leak. Repair and recharge system.
1.
Supply and/or return grilles are incorrectly
oriented. Reorient grilles.
2.
Supply and return grilles are too close
together. Move further apart.
3.
Insufficient heat load. Add temporary heat
load to compensate.
Check for supply registers that may be too close
to the return temperature sensor. Relocate
sensor if necessary.
Adjust temperature setting.
Valve actuator wiring is faulty. Check wiring
against schematic and rewire if necessary.
SS-SVX002B-EN
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