ATS CyberChiller Series - Manual (Page 29)

(©October, 2006)
CyberChiller Series Installation, Operation & Maintenance Manual
4-2
4.2 Troubleshooting
WARNING
Turn off all power to the unit before conducting any troubleshooting procedures, unless the procedure specifi-
cally requires the system to operate. Keep hands, clothing and tools clear of the electrical terminals and
rotating components. Ensure that your footing is stable at all times.
SYMPTOM PROBABLE CAUSE RECOMMENDATION
Unit Fails to Start a. Incorrect phasing or voltage. Correct phase or voltage input.
b. Power failure. Check power source, power inlet and
fuses. Check control cables and
connections.
c. Overload protection tripped. Check for cause of overload and re-set
circuit breaker(s) or motor starter(s).
Suction Pressure Too Low a. Loss of refrigerant (bubbles in Locate leak and repair. Recharge
sight-glass). system.
b. Expansion valve stuck or obstructed Remove and clean or replace valve.
(short cycle or continuous running).
c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.
Evaporator Coil Ices a. Temperature setting too low Increase temperature setpoint.
b. Low refrigerant charge. Find leak, repair and recharge system.
c. Low water flow rate Increase flow rate
Pump Fails to Start a. Power failure. Check main voltage power source
input cable.
b. Control transformer circuit Check for short circuit or ground fault;
breaker tripped. if none reset circuit breaker.
c. Defective contactor. Repair or replace.
d. Motor starter protector tripped. Reset motor starter protector and check
amperage of motor. Compare to setting
on motor circuit controller and adjust to
FLA.
Control is Erratic Wiring improperly connected or Check wiring against schematic
broken. diagram.