Lydall Affinity User Manual page 23

Problem
Low coolant Pump suction strainer clogged
flow
Flow control valve not fully open
Pressure relief valve set too low
(unless not adjustable)
Low coolant level in reservoir
Restriction in coolant lines external
to chiller
Frozen evaporator
Flow switch clogged
No coolant flow Pump not primed
Pump suction strainer clogged
No coolant in reservoir
Pump overload tripped
Pump motor shaft bound to seal
Pump housing improperly torqued
Damaged pump
Frozen evaporator
Clogged line or closed valve in
external piping
Leak(s) in external piping
Possible Cause Possible Remedy
Remove strainer, clean and reinstall
or replace
Open flow control valve
Adjust pressure relief valve to
specification
Fill reservoir to proper level
Eliminate restrictions in coolant
lines external to chiller
Call Lydall
Disassemble flow switch, clean and
reinstall, or replace
Prime pump
Remove and clean strainer, then
reinstall
Repair any leaks, then fill reservoir
Wait 5 minutes for overload to reset
Replace pump or renew seal
Remove pump, torque to
specifications, test, and reinstall
Replace pump
Call Lydall
Check external piping for dirt or
closed valve
Repair leaks as needed