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Chiller/Heater Troubleshooting
11. Symptom: High chilled water temperature (continued)
Possible Causes
Load higher than capacity of chiller/heater
Low refrigeration charge
Temperature sensor not properly installed
Fouled evaporator
Excessive flow through evaporator
12. Compressor thermal protector switch open (overloading)
Possible Causes
Electrical malfunction
Operating beyond design conditions
Discharge valve partially shut
Liquid floodback
Compressors overamping
13. Symptom: No low voltage (24 Vac)
Possible Causes
Control circuit fuse open
Phase monitor opened or tripped
No primary voltage on T1 or T2
14. Symptom: Flow switch open
Possible Causes
Insufficient water flow
Switch defective
15. Symptom: Electronic expansion valve superheat too high
Possible Causes
Water/glycol temperature too warm
Obstructed filter dryer
Low refrigerant charge
Improperly set superheat valve setting
16. Electronic expansion valve superheat too low
Possible Causes
Suction temperature sensor not properly located
Improperly set superheat valve setting
Low flow
17. Symptom: Contactor/relay inoperative
Possible Causes
Coil shorted or open
Mechanical parts broken or jammed
Coil shorted or open
Contacts broken or jammed
Contacts pitted or burned
No 24 Vac to coil
Bad relay on microprocessor controller
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Potential Solutions
Refer to chiller/heater design specifications
Conduct leak check on refrigeration system
Check that sensor is properly installed in well
Reverse flush evaporator; check strainer for debris
Reverse flush evaporator; check strainer for debris; check pump, valves
Potential Solutions
Check contactors for damage; check wiring for loose connections;
replace compressors
Allocate chiller/heater for use within operating capacity. Add equipment
Open valve
Adjust electronic expansion valve, increase flow, or raise set point
Correct refrigerant charge; check electrical connections
Potential Solutions
Check fuse prong contact points; replace fuse
Replace transformer, T1 or T2 primary or secondary fuse blown
Check breakers, fuses; check power supply specifications
Potential Solutions
Check strainer for debris; clean strainer
Replace flow switch
Potential Solutions
Low refrigerant level; adjust chiller/heater refrigerant charge as required
Replace filter dryer
Adjust refrigerant as per data plate
Reset valve settings to factory specifications
Potential Solutions
Check if secured to pipe or insulated; check sensor position on pipe at 4-
8-10-2 o'clock positions
Reset valve settings to factory specifications
Increase flow or clean strainer
Potential Solutions
Replace contactor
Replace assembly
Replace contactor
Replace contactor
Replace contactor
Check for loose wiring. Replace secondary fuse to T2 transformer
Replace microprocessor controller
ARTC-SVX005A-EN
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