1. Product zone temperature too high.
1. Control Setting Too High - Reset Control
2. Inadequate Air Circulation - Rearrange Product Load To Improve Air Circulation And Flow. Keep Empty Trays in Position.
3. Unit May Need To Be Manually Defrosted. (Refer to Page 5.)
4. Unit May Be In Defrost Cycle. See Indicator Light. Close Door And Wait 20 Minutes for Defrost Cycle To Finish.
5. Clean the Condenser (Refer to Page 11.)
2. Air Screen unit fails to start - no hum.
1. Power Cord is Disconnected - Reconnect
2. Fuse - Replace Fuse
3. Circuit Breaker has Tripped. Reset Breaker in Electrical Box.
4. Overload Protection - Determine Reason & Correct, Replace If Necessary
5. Unit may need to be defrosted or has tripped off due to overload. Wait 30 minutes: Unit will self-reset.
3. Condensing unit fails to start - hums but trips on overload protector.
1. Unit may need to be defrosted or has tripped off due to overload. Wait 30 minutes: Unit will self-reset.
2. Improperly Wired - Check Wiring Against Diagram
3. Low Voltage - Determine Reason & Correct
4. Starting Capacitor Defective - Determine Reason & Replace
5. Relay Not Closing - Determine Reason & Correct, Replace If Necessary
6. Compressor Motor Has Winding Open Or Shorted - Replace Compressor
7. Internal Mechanical Trouble In Compressor - Replace Compressor
4. Condensing unit starts, but fails to switch.
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
5. Condensing unit starts and runs, but short cycles on overload protector.
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
6. Condensing unit runs but short cycles on.
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) Liquid Line Solenoid Leaking - Replace
b) Compressor Valve Leak - Replace
c) Undercharge - Fix Leak, Add Refrigerant
d) Restriction In Expansion Device - Replace Device
7. Condensing unit operates for prolonged periods or continuously.
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
6. Evaporator Coil Iced - Defrost
7. Restriction In Refrigeration System - Determine Locations & Remove
8. Dirty Condenser - Clean Condenser
9. Filter Dirty - Clean or Replace
XII - Troubleshooting Guide
Содержание AIR CURTAIN ULTRA
Страница 13: ...XIII Wiring Diagram...
