ClimaCool UGW Manual - Manual (Page 65)

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Troubleshooting Guide
WARNING!
The troubleshooting guidelines recommended in this section
could result in exposure to electrical safety hazards . Please
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 .
Table 4
Chiller Will Not Start
Possible Cause Remedy
Power off Check main disconnect switch.
Main line open Check main fuses.
Incorrect wiring Check the wiring diagram.
Loose terminals/connections Tighten the terminal connections.
Control circuit open Check interlocks with auxiliary equipment, pressure and
temperature controls.
Improper phasing of main power Change any two of three phases of main power.
Compressor Hums But Does Not Start
Possible Cause Remedy
Low voltage Check at main power entry and unit power entry (consult
power company if low).
Phase loss Check power wiring and fuses.
Compressor Runs But Does Not Cool
Possible Cause Remedy
Improper phasing of main power Switch any two of three phases of main power.
Compressor Cuts Out On Low Pressure Safety Control
Possible Cause Remedy
Main chilled water valve closed or restricted Open valve to full open position.
Module chilled water isolation valves, if
provided, closed or restricted
Open valves to full open position.
Refrigerant storage Check for leaks – add refrigerant.
No load on water chiller Check water pump operation.
Restriction in liquid line Plugged liquid line drier – replace liquid line drier.
Expansion valve clogged or inoperative Repair/replace the expansion valve.
Low discharge pressure Raise and control discharge pressure within design limits.
Low water flow through the cooler Check water flow through the cooler.
Chilled water temperature too cold Raise water temperature setpoint.
Fouled evaporator brazed plate heat exchanger Clean-in-place heat exchanger as described on page 22.
Improper chilled water circulation Use an ample sized cleanable strainer in the chilled water
circuit; make certain the strainer is clean to insure full flow of
chilled water (strainer screen must be 60 mesh minimum).
Faulty suction pressure transducer Verify transducer calibration using a calibrated manifold gauge
and replace if defective.
Wrong suction pressure cutout setpoint Verify suction pressure cutout setpoint to be set equal to the
corresponding leaving chilled solution freeze temperature
equivalent pressure on a PT chart. (i.e. If the solution freeze
point is 32 o F, the equivalent pressure setpoint will be 101 psig).
43 .