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2-40 HP Portable Chillers Chapter 4: Operation 33 of 78
Indicator Name Description
Low Water
Flow/Pressure
Light
The Low Water Flow/Pressure light comes on when
the flow switch (pressure switch on 2 & 3 hp
models) senses that the water/glycol flow rate
through the evaporator has dropped below an
acceptable level. The flow switch opens shutting
down the pump(s) and the chiller.
Low Refrigerant
Pressure Light
The Low Refrigerant Pressure light come on if the
compressor suction pressure drops below the limit
of the low pressure cutout switch. The compressor
shuts off, but the pump(s) continues to run.
The indicator turns off and compressor restarts
automatically when the refrigerant pressure rises to
the limit of the low-pressure cutout switch. Call a
qualified refrigeration service technician or contact
the Service Department.
Low Oil Pressure
Light
The Low Oil Pressure light is installed on chillers
with a semi-hermetic compressor that have an oil
pump. A differential pressure switch monitors the
difference between crankcase pressure and oil pump
pressure.
If the pressure drops to an unsafe level for more
than two minutes the switch will open the control
wiring circuit, shutting off the compressor, turning
the light on, but allowing the pump(s) to continue
running. This is a manual reset switch. Call a
qualified refrigeration service technician or the
Service Department.
Control Power
Lighted Switch
The green, lighted, sustained-on Control Power
Switch lights whenever the switch is in the ON
position and the control circuit is energized.
Alarm Silence
Switch
The red momentary-on Alarm Silence Switch is
used to turn off the audible alarm on chillers that are
built with the audible or audible/visual alarm option.
This switch is always provided and requires no
additional wiring if either alarm option is installed at
a later time.