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BC0530 Service Manual
Compressor Test Procedure
Safety:
•
Refer all service work to qualified technicians.
•
Knowledge of proper installation and service
procedures is essential to the safe maintenance of
equipment.
•
Do not operate equipment that has been damaged.
•
Always disconnect the power supply before
servicing the equipment. Some circuits remain
energized when the ice machine is switched off.
•
Never operate the ice maker with any covers,
panels or other parts removed or not properly
secured.
•
Never modify the circuitry of equipment from the
original specifications.
•
Use only genuine replacement parts.
•
Use of non-approved parts when servicing
equipment may create a safety hazard or cause
equipment and property damage.
•
Use of non-approved parts, when servicing
equipment, will void the equipment warranty.
Caution: Failure to comply with all service guidelines may cause personal injury,
CAUTION
equipment or property damage and voiding of the product warranty.
Note: • When servicing ice machine refrigeration
systems, all work performed must be consistent
with the best refrigeration service practices. These
systems must remain clean, dry and properly charged
with refrigerant, in order for the ice machine to
operate as designed.
•
All ice machine models utilize CSR (capacitor
start/capacitor run) compressors. Each model
includes a potential start relay, a start capacitor
and a run capacitor, in the compressor circuitry, to
start and operate these compressors properly and
with maximum efficiency. This procedure will help
diagnose problems with these compressors and all
related components.
Test Procedure for a Short Circuit to Ground
(Ground Fault)
1. Disconnect all electrical power to the system,
making sure all power legs are open.
•
Disconnect all electrical power before removing the
protective terminal cover.
•
Never energize the system unless the protective
terminal cover is securely fastened.
•
Never energize the system unless the compressor
is properly connected to ground.
•
Never reset a circuit breaker or replace a fuse
without checking for a short circuit to ground. An
open fuse or tripped circuit breaker is an indication
of a ground fault. Energizing a compressor with
a ground fault may cause terminal pin ejection,
which will allow oil and refrigerant to spray out
of the system. This oil spray, combined with
an electrical spark, can ignite causing harm to
personnel and property.
•
Discharge all capacitors with a 20,000 ohm resister
before working with them or removing them from
the ice machine. This must be done to avoid
damage to measuring devices and the risk of
electrical shock.
2. Remove the protective terminal cover. Inspect
for evidence of overheating at any connection.
Overheating is an indication that a compressor
motor problem exists. Disconnect all leads from
the terminal pins.
3. Check the compressor for a ground fault using
an ohm meter or a high potential ground tester.
Connect one lead to the copper suction line and
connect the other lead to one of the terminal
pins. Repeat this procedure for the two remaining
terminal pins. If the instrument indicates any
resistance less than 2 mega ohms between any
pin and the suction line (compressor housing), a
ground fault exists.
4. If a ground fault exists, replace the compressor.
Do not reconnect the compressor or re-use any
leads or terminal connectors that exhibit signs of
overheating.
March 2020
Page 29
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