Panasonic NR-AF162SNAE / NR-AF162SNWG Service Manual ▷ View online
2. PREPARATION
1. Remove Cover Protector from Compressor
2. Replace Starting Relay.
3. Replace Over Load Protector (OLP).
2. Replace Starting Relay.
3. Replace Over Load Protector (OLP).
3. DISCHARGING THE REFRIGERANT
4. REMOVING THE COMPRESSOR
1.
2.
3.
5. MEMERIKSA OLI COMPRESSOR
CHECKING THE COMPRESSOR OIL
1.
2.
Note:
3.
4.
6. PURGING THE PIPE IN THE REFRIGERATING UNIT
Note:
1. For purging the pipe, use HFC-134a as liquid state only.
2. Standard of purging the pipe
a
b Continue to purge the pipe until no stained liquid come out.
c All pipes except for compressor and dryer should be cleaned by purging.
c All pipes except for compressor and dryer should be cleaned by purging.
Tilt the compressor slowly and let a little oil
(approx. 10 ml) flow out from the charge
pipe.
(approx. 10 ml) flow out from the charge
pipe.
In case of clog caused by solid substance,
when compressor oil has no discoloration
(light yellow) the compressor is installed
as it was. So don't collect the oil more
than approx. 10 ml. Otherwise it may
cause a malfunction.
when compressor oil has no discoloration
(light yellow) the compressor is installed
as it was. So don't collect the oil more
than approx. 10 ml. Otherwise it may
cause a malfunction.
According to "Diagnosing standard" of the
degree of the case of discoloration of the
oil.
degree of the case of discoloration of the
oil.
Purging the pipe is necessary when compressor oil deteriorates severely and when
compressor oil contains impurity.
compressor oil contains impurity.
The treatment of the case should be
decided by " Repairing Standard of HFC-
134a Refrigerating Unit".
decided by " Repairing Standard of HFC-
134a Refrigerating Unit".
Never use cleaning liquid which contain chlorine and blowing agent such CFC-12,
HCFC-22, CFC-113, HCFC-141b and R-502.
HCFC-22, CFC-113, HCFC-141b and R-502.
Prepare a clean vinyl bag (enclosed in the
compressor part case ) for the oil.
compressor part case ) for the oil.
Cut the compreesor sharge pipe and
capillary pipe near Dryer to discharge
Refrigerant.
capillary pipe near Dryer to discharge
Refrigerant.
Disconnect the Suction pipe from the
compressor with brazing
compressor with brazing
Disconnect the discharge pipe from the
compressor with brazing.
compressor with brazing.
Remove the Compressor.
Suction pipe
Compressor
Discharge Pipe
Dryer
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High pressure side
1.
Note:
2.
3.
4. Open the valve of charge cylinder.
5.
5.
6.
Note:
7.
8.
Low Pressure side
9. Connect the process - tube - fitting with the suction pipe by wrenches.
10. Connect the charge cylinder (for HFC-134a) with the process - tube - fitting.
11.
11.
12. Leave it until liquid surface in the glass tube of charge cylinder is stabilized (for approx. 10~20 seconds).
13.
14. Collect the liquid in the container and see how stained the discharge liquid.
15. If discharged liquid is stained, repeat the purging at low - pressure side.
16.
13.
14. Collect the liquid in the container and see how stained the discharge liquid.
15. If discharged liquid is stained, repeat the purging at low - pressure side.
16.
Open the valve of charge cylinder and pinch - off the end of cappilary tube when the refrigerant
start discharging.
start discharging.
Cut the end of capillary tube with capillary tube cutter and place a container at outlet.
When pipe cleaning at low - pressure side is finished, disconnect the process - tube fitting from the
suction pipe.
suction pipe.
Connect the process - tube - fitting with the
inlet pipe of dryer by wrenches.
inlet pipe of dryer by wrenches.
Do not purge the pipe at high - pressure side
from compressor side so that no deteriorated
oil can flow into the condenser.
from compressor side so that no deteriorated
oil can flow into the condenser.
Connect the charge cylinder (for HFC-134a)
with the process - tube - fitting.
with the process - tube - fitting.
Place a container at the inlet of discharge pipe
firmly.
firmly.
When pipe - cleaning at high - pressure side is
finished, disconnect the process - tube - fitting
from the inlet pipe of dryer.
finished, disconnect the process - tube - fitting
from the inlet pipe of dryer.
Close the valve of charge cylinder when liquid
come out.
come out.
Collect the liquid in the container and see how
stained the discharged liquid (the inside).
stained the discharged liquid (the inside).
In case that the pressure at the charge cylinder
is low, refrigerator may not come out as liquid.
is low, refrigerator may not come out as liquid.
If the inside is not cleaned yet, repeat purging
until the inside is completely cleaned.
until the inside is completely cleaned.
Container
Cylinder charge
Container
Charge Cylinder
Low pressure side
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7. ASSEMBLING THE COMPRESSOR AND THE DRYER
General Clause
> It should be finished within 30 minutes.
When pipe purging no need
When pipe purging has need
>
> The Dryer just special for HFC-134a refrigerant only.
Assembling Compressor
1.
>
>
2.
3.
>
>
4.
5.
6.
6.
7.
8.
Replacement Standard of Dryer
1.
2.
3. Insert the capillary tube ±15mm into the
dryer.
Bend the capillary tube at an obtuse angle of about 120o along 15mm from the cut end before
inserting the tube into the dryer. Then insert the tube until it is stopped by the bend. This is to
prevent the tube from going into the dryer too far and breaking the filter placed inside. Also this
insure that the tube goes into the dryer far enough not to be clogged with the filler metal during
brazing.
inserting the tube into the dryer. Then insert the tube until it is stopped by the bend. This is to
prevent the tube from going into the dryer too far and breaking the filter placed inside. Also this
insure that the tube goes into the dryer far enough not to be clogged with the filler metal during
brazing.
Break the package of dryer just before
use. This is to prevent dryer from
absorbing moisture in the air.
use. This is to prevent dryer from
absorbing moisture in the air.
If the
package is bruise, as air has leakage
into the package, never use the dryer in
the package.
into the package, never use the dryer in
the package.
use dryer within the term of validity
(which is marked in the package).
(which is marked in the package).
Joint capillary tube, Mullion dryer pipe and Charge pipe (Dia. 4 mm) to Draye with brazing.
From the process of removing compressor until the process of setting compressor and dryer
(just before vacuum pumping process).
(just before vacuum pumping process).
From the time just after pipe cleaning is completed until the process of setting compressor
and dryer (just before vacuum pumping process).
and dryer (just before vacuum pumping process).
If pipe are being kept open to air, moisture will go into the refrigerating unit and it may cause a
malfunction in the refrigerating unit again.
malfunction in the refrigerating unit again.
Note:
Joint the gascharge pipe with brazing.
Remove rubber caps of compressor just before
compressor is installed.
compressor is installed.
Shape and length of pipe must be suitable
with Discharge pipe.
with Discharge pipe.
If there is no sound of discharging gas, never
use the compressor.
use the compressor.
Joint the suction pipe and compressor with
brazing.
brazing.
Check the sound of discharging gas from the
compressor when rubber caps are removed.
compressor when rubber caps are removed.
Take out the dryer from the package just before
use.
use.
Note:
Set the compressor in the compressor room.
Joint the discharge pipe and compressor with
brazing.
brazing.
D joint must place in compreesor room at
Cooling unit.
Cooling unit.
Dryer
Discharge Pipe
Compressor
Suction Pipe
Suction
Suction
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8. VACUUM PUMPING
General Clause:
a Vacuum pumping should be done more than 60 minutes from 2 portions.
a Vacuum pumping should be done more than 60 minutes from 2 portions.
One portion at high - pressure side and one portion at low - pressure side.
b Be sure the Adaptor good connect to vacuum pump.
c
1.
2.
3.
4.
Note:
1. Check the reading of manifold gauge before use.
2.
2.
3.
4. For High Pressure
For Low Pressure
5.
6.
7.
After 2 minutes vacuum pumping, close the valve form manifold gauge and control
valve, make sure the indicator gauge no move.
valve, make sure the indicator gauge no move.
Open the Valve from manifold gauge and control valve, and one again vacuum
pumping more than 60 minutes.
pumping more than 60 minutes.
When to finish vacuum pumping, disconnect the coupler Socket at High Pressure and
close both Valve (red and yellow) from manifold Gauge. then stop the vacuum pumping.
close both Valve (red and yellow) from manifold Gauge. then stop the vacuum pumping.
Insert the coupler plug to compressor charge pipe and lock the lever. Then connect the
coupler plug with coupler socket.
coupler plug with coupler socket.
If the reading at low-pressure gauge does not reach 760 mmHg while the vacuum pump
alone is running, there is aleakage or something is wrong with the pump, check the
rubber packing of hose and the deterioration of vacuum pump oil.
alone is running, there is aleakage or something is wrong with the pump, check the
rubber packing of hose and the deterioration of vacuum pump oil.
Check the vacuum level by read the Vacuum Gauge periodicly, if gauge indication over
from 0.5 torr, change the oil vacuum pump and check the packing rubber.
from 0.5 torr, change the oil vacuum pump and check the packing rubber.
Inert the coupler plug to dryer charge pipe and lock the lever. Then connect the coupler
plug with coupler socket.
plug with coupler socket.
The Adaptor can stop oil flow from Vacuum Pump to Cooling Unit HFC-134a, after
Manifold Gauge and Charge Hose vacuum condition.
Manifold Gauge and Charge Hose vacuum condition.
Be sure the rapir tools which are exclusive use for HFC-134a (except vacuum pump).
Run the vacuum pump for 30 minutes before connecting. This is to resume the vacuum by
evaporating the cleaning liquid which is blent in the pump oil.
evaporating the cleaning liquid which is blent in the pump oil.
Connect repair tools such as control valve, manifold gauge, charge hose, coupler socket,
charge cylinder as shown in the figure.
charge cylinder as shown in the figure.
Connect the adaptor with vacuum pump properly and turn the switch to HFC-134a use.
Run the vacuum pump and open each valve (3 portions) of manifold gauge and check the
vacuum.
vacuum.
Coupler Socket
Charge cylinder
Control Valve
Manifol Gauge
Valve
state
state
open
Valve
state
close
Valve
state
close
Adaptor
Coupler plug
(one-touch type)
(one-touch type)
Coupler plug
(one-touch type)
(one-touch type)
Change Switch
HFC-134a
Low Pressure
Gauge
Gauge
High Pressure
Gauge
Gauge
Valve open state
during vacuum pumping
during vacuum pumping
Valve
state
during vacuum pumping
close
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