Service manual

Quantum Series Installation and Service Manual
Publication Number: 85289 - 12 - © 2002-2010, IMI Cornelius Inc.
TROUBLE-SHOOTING GUIDE
The following pages contain trouble-shooting charts designed to aid an experienced serviceman in diagnosing
any operating problems that may be experienced. In order to gain maximum benefit from the charts, please note:
1. Start at the beginning of the chart and supply the appropriate answer to each question.
2. Do not skip any section, unless instructed to do so. You may miss the solution to your problem.
3. Evaluate the possible problem causes in the sequence in which they are presented. In general, they began
with the most likely and/or easiest to check, and proceed to the less likely and/or more complicated.
4. If, after checking all indicated causes, the problem is not resolved, it is recommended that you try a second
time. Evaluate symptoms carefully and modify your answers as necessary.
5. If you are unable to resolve a problem after several attempts, contact customer service department at (1-800-
238-3600) for assistance.
PROBLEM PROBABLE CAUSE
REMEDY
Totally Inoperative
No power to dispenser due to tripped
circuit breaker.
Reset circuit breaker. Confirm that breaker is cor-
rect size and no other equipment is connected to
the same circuit. Also confirm that supply voltage
is +
10% of nameplate specifications.
Loose or broken power supply connec-
tion inside dispenser.
Repair connection
No cooling
Line voltage is not within +
10% of
nameplate specifications causing com-
pressor overload to trip
Contact an electrician
Both thermostats in OFF position Turn ON thermostats and recalibrate the tempera-
tures to 34
o
F -40
o
F (1.1
o
C –4.5
o
C).
Defective compressor overload or start
capacitor
Replace
Defective start relay located on upper
rear shelf inside dispenser
There should be line voltage on the black wire of
the relay when there is line voltage present on the
orange OR yellow wire. Replace relay if it fails this
test.
Compressor starts but hums and trips
overload
Seized or shorted compressor, replace.
Compressor starts but does not switch
off of start winding
Relay or compressor is defective. Test and
replace faulty item.
Compressor short cycles on overload Excessively high discharge pressure due to
restricted condenser or inoperative condenser fan
motor
Refrigerant leak Repair leak. Evacuate and recharge system.