Turbo Air TSD-27CF, Service Manual

Page: 8 / 26

CHEST FROZEN SHOWCASE
TSD-27CF
Cause Check Point Correction
Compressor
Check coils
resistances
Repair Procedure
1. Replace compressor if measured resistances differ from given standard
2. Abnormal noise
Not cooling
Check thermostat
setting
Repair Procedure
1. Operate unit for 10 minutes with thermostat set at maximum
Insufficient cooling Check gasket gap
Repair Procedure
1. Check if gap can be resolved by adjustment of door hinges fixing screws.
2. Defrost if accumulation of frost is more than 10mm.
Malfunction due to
leaks or clogged
system
Charged (purge) with
nitrogen into the
refrigeration system
& check for leaks on
welds or clogs
Repair Procedure
1. Check for clog or leak in the cooling system.
2. Repair or replace the clogged or leak section.
3. Evacuate and change filter dryer.
4. Purge with nitrogen to clean and check for leaks
5. Recharge refrigerant, test run and seal system
TROUBLE INSPECTION CAUSES REMEDY
Check electric power
supply voltage Open circuit breaker or
fuse
Fix or replace
Open Fuse Replace
No Power
Check electrical circuit
Worn out or defective A/C
cord
Replace
Check lamp
Open Replace
No Light
Check lamps socket
Corroded Replace
Low Cooling Check for thermo setting Setting too low Set thermostat higher
Deform or warp door
gasket. Adjust door hinges fixing
screws Check leaks
Poor weld on joints
Repair, purge with
nitrogen re-charge
refrigerant and test run.
Over storage or load or
heavy frost accumulation Reduce or re-arrange
load or defrost unit
Defective Cooling
System Check Thermostat Check if compressor runs
by shortening thermostat Replace thermostat if
compressor runs.
Check PTC starter
resistance against given
value
Open, no resistance or
differ from given value
Replace PTC starter.
Check Overload Protector Check for continuity Replace if open.
Check for leaks
Leaks or poor welds on
joints
Repair, re-weld, purge,
evacuate and recharge
refrigerant
Check Compressor
resistance against given
specification
Defective
Replace, weld, purge,
check for leaks and re-
charge refrigerant, test run
and seal system
Check Pipe System
Clogged Pipe System or
oil choke
1. Evacuate then Purge
with nitrogen to remove
clogs
2. Repair or replace
clogged section, evacuate,
purge, check leak and re-
charge refrigerant. Test
Run and seal system