ClimaCool SHC onDEMAND 30, 50, 70, 85 Manual - Manual (Page 60)

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58
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,
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‘••‹„Ž‡ƒ—•‡ ‡‡†›
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
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‘••‹„Ž‡ƒ—•‡ ‡‡†›
Low voltage Check at main power entry and unit power entry (consult power
company if low)
Phase loss Check power wiring and fuses
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‘••‹„Ž‡ƒ—•‡ ‡‡†›
Improper phasing of main power Switch any two of three phases of main power
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‘••‹„Ž‡ƒ—•‡ ‡‡†›
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 Ȃ add refrigerant
No load on water chiller Check water pump operation
Restriction in liquid line Plugged liquid line drier Ȃ 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 in IOM (page 31)
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.)
disconnect all electrical power including remote disconnects
before servicing. Follow proper lockout-tagout procedures.
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handle live electrical components should only be allowed
to work with energized electrical components.