FWE Air Supremacy Air Screen ASU-9 Installation Manual & Operating Instructions page 14

FWE ASU-9 AIR SUPREMACY AIR SCREEN
TROUBLESHOOTING GUIDE (cont'd)
PROBLEM
4. Condensing unit starts, but fails to switch
5. Condensing unit starts and runs, but short
cycles on overload protector.
6. Condensing unit runs but short cycles on.
7. Condensing unit operates for prolonged
periods or continuously.
POSSIBLE CAUSE/REMEDY
1. Improperly Wired - Check Wiring Against Diagram
off of "start" winding.
2. Low Voltage - Determine Reason & Correct
3. Relay Failing To Open - Determine Reason & Correct,
Replace If Necessary
4. Run Capacitor Defective - Determine Reason & Replace
5. Excessively High Discharge Pressure - Check Discharge
Shut-Off Valve, Or Insufficient Cooling On Condenser
6. Compressor Motor Has Winding Open Or Shorted -
Replace Compressor
7. Internal Mechanical Trouble In Compressor -
Replace Compressor
1. Additional Current Passing Through Overload Protector -
Check Wiring Diagram. Check For Added Fan Motors,
Pumps, etc., Connected To Wrong Side Of Protector
2. Low Voltage To Unit (or unbalanced if three phase) -
Determine Reason & Correct
3. Overload Protector Defective - Check Current - Replace
Protector
4. Run Capacitor Defective - Determine Reason & Replace
5. Excessive Discharge Pressure - Check Ventilation,
Restrictions In Cooling Medium, Restrictions in Refrigeration
System
6. Suction Pressure Too High - Check For Possibility Of
Misapplication. Use Stronger Unit
7. Compressor Too Hot (return gas) - Check Refrigerant Charge
(fix leak) Add If Necessary
8. Compressor Motor Has Winding Shorted - Replace
Compressor
1. Overload Protector - See #3 Above
2. Thermostat - Differential Set Too Close
3. High Pressure "Cut-Out" Due To:
a) Insufficient Air or Water Supply - Check Air or Water
Supply To Condenser, Correct
b) Overcharge - Reduce Refrigerant Charge
c) Air In System - Purge
4. Low Pressure "Cut-Out" Due To:
a) Compressor Valve Leak - Replace
b) Undercharge - Fix Leak, Add Refrigerant
c) Restriction In Expansion Device - Replace Device
1. Unit may need to be defrosted.
2. Shortage Of Refrigerant - Fix Leak, Add Charge
3. Control Contacts Stuck or Frozen Closed - Clean Contacts or
Replace Control
4. Excessive Heat Load Placed Into Cabinet - Allow Unit
Sufficient Time For Removal Of Latent Heat
5. Prolonged or Too Frequent Door Openings - Plan or
Organize Schedule To Correct Condition
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