Problem Possible Cause Possible Remedy
Does not cool
(continued)
Compressor internal thermostat
tripped causing compressor to
stop running
Compressor damaged
Evaporator damaged
Microprocessor failure
Allow time for compressor to
cool, determine cause, repair
Replace compressor
Call Lydall
Replace microprocessor
LOW LEVEL Low level in reservoir due to coolant
leakage, or evaporative loss
Inspect for leakage in chiller, repair,
refill reservoir
LOW
SUCTION
PRESSURE
Low compressor inlet pressure
could be caused by insufficient
refrigerant, restriction in flow of
coolant in the evaporator, or
freezing in the evaporator if the anti-
freeze concentration is too low. Hot
gas valve not functioning properly.
Check refrigerant flow in sight glass.
Note: Bubbles in sight glass
indicate refrigerant is too low. Call
Lydall.
PUMP Flashes in response to a signal
from the flow switch in the pump
discharge line that indicates low
(less than ½ gallon per minute) or
no flow.
Check if the pump is running or
stopped. Check if pump is
mechanically operable. Check if the
overload is open or closed.. Ensure
that sufficient liquid is available.
“Start” on overload must be
depressed for the pump to start
after a fault.
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