Appendix D Troubleshooting - HL -i Series Use And Maintenance Handbook

Appendix D
TROUBLE
A ) Defective connection or open contacts
The unit doesn't The unit doesn' t start up
start up
Compress. delay timer
Safety device response is missing
The unit alarms
Wrong parameters setting
B ) Burned or seized compressor
Compressor
Compressor remote control switch is de-
doesn't start energised
Power circuit open
The unit alarms
Compressor's thermal overload circuit
breaker acts
C )
Compressor Control temperature return diffirence setting
starts and stops is too small
repeatedly
D ) Pressure switch out of order
Compressor
Excessive refrigerant charge
doesn't start
Clogged air condenser Too limited air
Because the
capacity
max. pressure
Condenser fans are not working
switch has been
Condenser fans rotate in wrong direction
actuated (HP1
or HP2 alarm)
Ambient air temperature is too high
E ) Pressure switch out of order
Compressor
Lack of refrigerant
does not start
because the
Water outlet sensor probe sets too low so that
min. pressure
the water freezes
switch has been
Water pump doesn't work
actuated
Water flow isn't enough
Clogged freon filter
Thermostatic expansion valve is not working
correctly
TROUBLESHOOTING
PROBABLE CAUSE
v x i
POSSIBLE CURE
Check voltage and close contacts
Press and hold for 5 seconds
Wait for set delay time
Check for the Error Code and do the
relevant cure
Reset
Replace compressor
Check voltage at compressor coil's ends and
check out for coil continuity
Try to find out the reason why protection is
activated close compressor's circuit
See point A
Reset
Raise the return diffirence setting ("r02"
parameter)
Check and replace
Recover excessive gas
Clean with compressed air or water jet
See point F
See Electric Connections paragraph
Reduce ambient temperature within design
limits, for example by increasing local
ventilation.
Check and replace
Call a qualified refrigeration engineer to
check for leaks and replenish refrigerant
Raise the set value or change the LP Switch
Check for the water pump
Check for whether the water filter is dirty
or clogged or not
Check and replace
Check, clean or, if necessary, replace