ClimaCool IOM AR2 SERIES - Manual (Page 76)

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Troubleshooting Guide
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Troubleshooting Guide
WARNING!
The troubleshooting guidelines recommended in this section could result in exposure to electrical safety hazards. Refer
to the safety warnings provided in this manual. Failure to follow all of the recommended safety warnings provided
could result in death or serious injury. When possible, disconnect all electrical power including remote disconnects
before servicing. Follow proper lockout-tagout procedures. Only a qualified licensed electrician or persons trained to
handle live electrical components should only be allowed to work with energized electrical components.
CHILLER UNIT WILL NOT START
Possible Cause Remedy
1. Power off 1. Check main disconnect switch
2. Main line open 2. Check main fuses
3. Incorrect wiring 3. Check the wiring diagram
4. Loose terminals/connections 4. Tighten the terminal connections
5. Control circuit open 5. Check interlocks with auxiliary equipment, pressure and temperature
controls
6. Improper phasing of main power 6. Change any 2 of 3 phases of main power
COMPRESSOR HUMS BUT DOES NOT START
Possible Cause Remedy
1. Low voltage 1. Check at main power entry and power entry at unit
(consult power company if low)
COMPRESSOR RUNS BUT DOES NOT COOL
Possible Cause Remedy
1. Improper phasing of main power 1. Change any 2 of 3 phases of main power
2. Refrigeration service valves closed 2. Open all refrigeration system service ball valves
COMPRESSOR CUTS OUT ON LOW PRESSURE SAFETY CONTROL
Possible Cause Remedy
1. Refrigerant shortage 1. Check for leaks - add refrigerant
2. No load on water chiller 2. Check water pump operation
3. Restriction in liquid line 3. Plugged liquid line drier - replace liquid line drier
4. Suction valve partially closed 4. Open valves fully
5. Expansion valve clogged or inoperative 5. Repair / Replace the expansion valve
6. Low discharge pressure 6. Raise and control discharge pressure within design limits
7. Low water flow through the cooler 7. Check water flow through the cooler
8. Chilled water temp. too cold 8. Raise water temperature
9. Fouled evaporator brazed plate HX 9. Clean-in-place HX as described in previous section
10. Defective low pressure switch 10. Replace low pressure switch