Unit installation

APPENDIX
Troubleshooter's guide
SYMPTOMS POSSIBLE CAUSE CORRECTIVE ACTION
Main disconnect switch open. Close switch, if safe to do so.
Faulty wiring or loose connections. Repair wiring or connections.
UVM tripped-Fautly power supply. Contact electric utility company to
investigate and rectify the problem.
Control switch OFF. Switch ON, if safe to do so.
No 24VAC supply to control board. Check control transformers and power
supply to control board.
Jumper PRG is closed Remove jumper
2. Unit does not run. Possible
Controller message:
No liquid flow through the cooler, flow
switch contacts are not made and control
circuit is open.
Ensure that pumps are running, valves are
correctly set and flow is established. Check
that flow switch is functional and is installed
properly.
ALARM MASTER NO WATER
CIRCULATION
Note: Pump starter is interlocked into the
chiller control circuit.
OR
ALARM MAKE SET UP: YXXX
PRESS <ON> to start
Compressor circuit breaker open. Close breaker and check circuit.
Faulty wiring or loose connections. Repair wiring or connections.
Possible Controller message: Low voltage, single phasing or phase
imbalance.
Determine reason and correct.
Defective contactor coil or contacts. Repair/ replace contactor.
Control circuit open. Locate cause and repair.
Shorted or grounded motor windings. Repair/ replace compressor.
Burntout compressor motor (open circuit). Repair/ replace compressor.
Internal compressor mechanical damage. Repair/ replace compressor.
Improperly wired. Check wiring diagram and rewire properly.
Low voltage, single phasing or phase
imbalance.
Determine reason and correct.
Possible Controller message: Bad contactor contacts. Replace contacts.
Overload Protector defective. Check and replace overload protector.
Shorted or grounded motor windings. Repair / replace compressor.
OR
Excessive suction or discharge pressures.
High discharge/ oil temperature,
insufficient oil charge or suction superheat
too high.
A
dd sufficient amount of proper compressor
oil or check suction superheat is within
range.
Tight bearings or mechanical damage in
compressor.
Repair/ replace compressor.
TROUBLESHOOTER'S GUIDE TO CHILLER PROBLEMS
(To be used by suitably qualifed personnel only)
1. Unit will not start, no display on
microprocessor controller panel.
Controller defect or problem with serial
cable integrity and connections.
Refer section on "Microprocessor
Controller" in this manual and take suitable
corrective action.
Incorrect setup values on the controller. Incorrect parameters should be reset
correctly on the controller.
Refer relevant sections in this guide and
take corrective action.
4. Compressor starts and runs, but
trips.
3. Compressor does not run (Hum
or No Hum).
ALARM COMPRESSOR N. # NO
RUN
ALARM COMPRESSOR N.#
BREAKER FAULT
ALARM COMPRESSOR N. #
SSPS FAULT
Check and maintain proper refrigerant
charge.
ALARM COMPRESSOR N. #
HIGH PRES. SWT FAULT
(represents overload relay fault)
OR
Compressor too hot- indadequate
compressor cooling (shortage of
refrigerant).
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