Technical information

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VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
port. If the water out temperature of the evaporator reaches the
freezestat setting the switch will open and stop the refrigeration
compressor.
B. Check for restricted water flow and add a bypass line if necessary.
C. The setpoint is adjusted too low for the safety switch settings.
D. The freezestat is adjusted incorrectly or is defective.
4.9 OIL PRESSURE (Semi-hermetic Compressors)
A. This switch must be manually reset after the problem is resolved.
B. Check for low oil level in the compressor crankcase or insufficient
compressor warm up before start-up.
C. Defective crankcase heater, internal compressor damage causing
the compressor to pump too much oil through the system,
defective oil pump, or plugged pick up screen in compressor oil
sump. Note: only semi-hermetic compressors 15-30 tons have an
oil pressure safety switch.
4.10 CRANKCASE HEATER (Semi-hermetic Compressors)
A. If the crankcase heater is not drawing current during the
compressor off cycle, check for a defective crankcase heater,
defective fuses or defective interlock on the compressor starter.
4.11 ELECTRONICS
A. The Display/CPU is used for all normal set ups, diagnostics,
temperature readout and operational information. This is not
normally a field repairable part. It is designed to be easily removed
and replaced if a problem arises.