Panasonic NR-AF162SNAE / NR-AF162SNWG Service Manual ▷ View online
XI. REFRIGERATING UNIT REPAIRING PROCEDURE
STANDARD PROCEDURE
Diagnosing the trouble
Discharging the refrigerant
Removing the Compressor
Checking the compressor oil
A little discoloration
(light yellow)
Severe discoloration
(light brown)
Purging the pipe At
high-pressure side
Purging the pipe at low-
pressure side
Joining compressor
and accumulator assy'
Setting the compressor and the dryer
Vacuum pumping and pot the electric parts
Charging the refrigerant
Leakage test
Test Run
Pinch-off seal of charge pipes
Finish
Refer to the TROUBLESHOOTING
* For purging the pipe, use HFC-134a as liquid state.
* Never use HCFC-141b, HCFC-22 for purging.
* Do not keep the pipes open to air more than 30 minutes.
* Never use HCFC-141b, HCFC-22 for purging.
* Do not keep the pipes open to air more than 30 minutes.
These process in total should be finished within
30 minutes.
* Rubber caps should be removed just before
compressor is used. Never leave the compressor
without the caps and open to the air.
Be sure to connect the adaptor with vacuum
pump.
Charge cylinder should be exclusive - use for
HFC-134a.
This is to prevent different refrigerant
( CFC-12, HCFC-22, CFC-113, HFCFC-141b, R-
502) from mixing with HFC-134a.
( CFC-12, HCFC-22, CFC-113, HFCFC-141b, R-
502) from mixing with HFC-134a.
IMPORTANT THINGS
-9-
XII. METHOD TO REPAIRING REFRIGERATING UNIT
CONDITION I. NOT COLD
Compressor not run
CONDITION II. COLD LESS
CONDITION III. VERY COLD
Both terminal direct
joining
joining
Compressor run
Compressor not run
Compressor run
Check with Ohm
Meter ( Tester )
Meter ( Tester )
Change Thermostat
OLP broken
Check with M.Tester
Change O L P
Starting PTC broken
Check with M.Tester
Change Starting PTC
Motor winding burn
Check with M.Tester
Change Compressor
Compressor noise
but not run
but not run
Power source broken
(Start Voltage not
enough )
(Start Voltage not
enough )
Starting P.T.C.
broken
broken
Motor winding
disconnect
disconnect
Starting Motor burn
Check Starting
P.T.C. Voltage under
load
Check with
M.Tester
P.T.C. Voltage under
load
Check with
M.Tester
Check with M.Tester
Repair Power Source
Change PTC Starting
Change Compressor
Change Compressor
Cooling Unit brooken
Gas leakage
Be found gas residu
Repair gas leakage
and re-charge
and re-charge
Gas nothing
Spray with gas
Compressor run but
not compress
not compress
Short time
Operation fault
Thermostat broken
Change Thermostat
Compressor running
Long time
Out side Evaporator
Evaporator closed by
frost to more
frost to more
Evaporator not close
by frost
by frost
Very Cold
Touch Defrost button
Cooling Unit broken
Repair at cooling unit
portion
portion
Joint pipe leakage
and clogged
and clogged
The door have more
gap
gap
Open the door very
long time
long time
Cold Less
Check Cooling Unit
Repair at cooling unit
portion
portion
Adjust the door
Give the direction to
customer
customer
Censor cappilary
Thermostat have
more gap
Thermostat have
more gap
Thermostat broken
Thermostat not have
voltage
voltage
Assembly censor
cappilary Thermostat
cappilary Thermostat
Check with M.Tester
Setting end of Censor
at center hole
at center hole
Change Thermostat
Repair Thermostat
wiring
wiring
Check with M.Tester
CHECK
CAUSE
SUSPECT
ANALYSIS
ACTION
-10-
1. TROUBLE - SHOOTING
Symptom: No cooling at all or insufficient cooling
Does compressor run ?
Check starting
circuit
Replace faulty electric
parts
No
No good
Check resistance of
motor winding with
ohm meter
Compressor locking
Check Oil Compressor
Pipe Cleaning
Replace compressor
Motor winding
disconnect or burn
OK
No Good
Change Thermostat
Does Thermostat good
operation?
Check Thermostat
No
Yes
Check frost on Evaporator
Yes
Clog caused by
moisture
Replace faulty
electric part
Check out weather oil is
oozing
Little Frosting or just on Inlet tube eva only
Gas leakage
Cut capillary tube at
outlet of dryer
Check the smell
Check compressor
oil
Can not repair
Bad smell
Occasionally frosting
Frosting too much
Yes
Compressor broken
Check Compressor Oil
Pipe Cleaning
Replace Compressor
Clog caused by
solid substance
solid substance
Clog caused by
solid substance
solid substance
Make compressor stop and
check if gas come out by
cutting capillary tube ar 35
mm from outlet of dryer
Gas come out from both dryer side
and evaporator side
and evaporator side
Gas come out from evaporator side only
Gas come out from dryer side only
No
(Clog near inlet of evaporator)
(Thermostat, starting relay, motor protector, starting
capacitor, running capacitor, defrost timer)
capacitor, running capacitor, defrost timer)
OK
OK
-11-
Check pressure at High Pressure side
1.
Note:
a.
b.
2. Suitable pressure measurement, next action is:
A. Gas Leakage ( A area / B area ) ……………..Can not repair
B.
Switch off theCompressorn then cut Capillary pipe ± 35 mm from Dryer out line. This
action for protect if clogged at Cooling Unit by refrigerant HFC-134a, then solid substance
will collect about ± 35 mm around Dryer out line.
action for protect if clogged at Cooling Unit by refrigerant HFC-134a, then solid substance
will collect about ± 35 mm around Dryer out line.
Install Pierching Plier with Pressure Gauge at Discharge near Compressor, then check
pressure from compressor running. If Compressor stop, start compressor again about ± 5
minutes until stabile pressure, then check pressure.
pressure from compressor running. If Compressor stop, start compressor again about ± 5
minutes until stabile pressure, then check pressure.
Before measuring, make sure the Pressure Gauge at " 0 " position. If not at " 0 "
position, adjust the Screw at Pressure Gauge.
position, adjust the Screw at Pressure Gauge.
Keep the gap from Pierching Plier about ± 4mm by adjust Screw at Pierching Plier.
Before release Pressure Gauge, catch poit (1) dan (2) with Pierching Plier. After Pressure
Gauge released, take Pierching Plier and cut point (3) and (4), then close again all pipe.
This action for keep the smell gas loose at atmosphere (HFC-134a will chemically
reaction).
Gauge released, take Pierching Plier and cut point (3) and (4), then close again all pipe.
This action for keep the smell gas loose at atmosphere (HFC-134a will chemically
reaction).
Compression not perfect and clogged by solid substance ( C area )
Area A
Area C
Area B
Normal
0
5
10
15
20
25
30
35
Sorrounding Temperatur [
o
C ]
P
re
s
s
u
re
[
k
g
f/
c
m
2
(
b
a
r)
]
-1
0
2
4
6
8
10
12
14
16
18
-12-
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