Lydall Affinity User Manual page 24

Problem
Chiller cools Microprocessor programmed
well below the incorrectly
desired Set-
Point Malfunctioning solenoid valve
Solid State Relay failure
Microprocessor failure
Chiller shuts Refrigeration high pressure cut-out
down during set too low
operation
Refrigeration low pressure cut-out
set too high
Water modulating valve set too high
Excess refrigerant charge
Pump overload setting too low
Pump overload tripped
Low voltage
Too much Flow control valve set too high
recirculating
pressure to Pressure relief valve set too high
process (unless not adjustable)
Compressor Compressor internal thermostat
does not run tripped
Defective Solid State Motor
Overload
Motor burned out
Possible Cause Possible Remedy
Reprogram microprocessor - Call
Lydall
Repair or replace solenoid valve
Replace Solid State Relay
Replace microprocessor
Adjust and reset refrigeration high
pressure cut-out
Adjust and reset refrigeration low
pressure cut-out
Adjust water modulating valve
Remove excess refrigerant, then
charge with type and amount of
refrigerated listed on serial tag
Adjust and reset pump thermal
overload relay to specifications, or
replace if faulty
Determine cause, if pump is
damaged, repair or replace
Check electrical service to chiller
Throttle flow control valve
Adjust pressure relief valve
Allow time for compressor to cool
and automatically reset
Replace module
Replace - Call Lydall