Westric IW Series, Installation, Operation And Maintenance Manual

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76-5276-05 Page 74 of 82
TROUBLESHOOTING GUIDE
PROBLEMS OR
SYMPTOMS
CAUSES TROUBLESHOOTING
Unit does not
work
1. - Power supply problem.
1. - Main Switch shut down (Off).
Switches and/or or actuated external fuses.
Loose cables and/or terminals.
Missing phase or bad neutral wiring, or two equal
phases.
2. - Room temperature lower than set-
point adjustment of Controller.
2 Add charge to the room or wait until room temperature
increases
3. - Shut down due to low pressure
switch.
3. - Check for cooling gas leaks.
Change clogged air filters
Check evaporator motor: burnt or locked.
4. - Shut down due to high pressure
switch
4. - Condenser motor locked or burnt.
Dirty condenser coil or with lumps
Excess gas, added in previous repair.
5. - Electrical wiring error 5. - Check electric wiring of assembly again
6. - No supply voltage reaches the
Controller
6. - Transformer is burnt or if DC to controller, key
switched off.
System
operates
continuou
sly and
insufficie
ntly.
1. - The unit is not enough to cool the
room.
1. - Make a heat balance, determine capacity to be
added.
2.- Damaged component malfunction.
2. - Replace damaged switches, adjust loose blowers,
clean dirty coils.
3 - Gas leaks
3. - Repair gas leaks, install and/or adjust service valve
caps and nuts. Charge additional gas.
4. - Defective compressor 4. - Replace compressor.
5. - Clogged air filter, low performance
(lack of air)
5. - Replace air filter.
Thermal
relays
of contactors
are actuated
1. - Inappropriate wiring for power
consumption
1. - Replace cable section.
2. - Defective motors and/or compressors 3.- Replace them
3.-Low voltage (10% lower than nominal
voltage)
4. - Manage troubleshooting.
Water inside
unit.
1. Drain pipe clogged and overflowing
into drain pan.
1.- Clean drain pipe.
Failure outputs are two relays which are always connected (on). Upon a failure, they change their status. If the PLC is
switched off, they also change their status because they are disconnected (off).
" Not Urgent " output is switched off with any failure.
" Urgent " output is switched off when two or more units have an alarm.
.