Panasonic Cs W7dkr Cs W9dkr Cs W7dkr Series Repair Manual

 2. Procedure and precautions for flare connection
Table 11 R410A flaring dimensionsNominal
diameterOutside
diameter
(mm)Wall thickness
(mm)A (mm)
R410A flaring
tool, clutch typeConventional flaring tool
Clutch typeWing-nuttype
1/46.350.80 - 0.51.0 - 1.51.5 - 2.0
3/89.520.80 - 0.51.0 - 1.51.5 - 2.0
1/212.700.80 - 0.51.0 - 1.52.0 - 2.5
Table 12 R22 flaring dimensionsNominal
diameterOutside
diameter
(mm)Wall thickness
(mm)A (mm)
R410A flaring
tool, clutch typeConventional flaring tool
Clutch...

Precau tions
 • Be sure to read the instructions for the vacuum pump,
vacuum pump adaptor and manifold gauge prior to use,
and follow the instructions carefully.
 • Make sure that the vacuum pump is filled with oil up to
the designa ted line on the oil gauge.
 • The gas pressure back flow prevention valve on the
charging hose is generally open during use.When you
are removing the charging hose from the service port, it
will come off moreeasily if you close this valve.
Fig. 12 Vacuum pump air purging...

11.4.2. Transferring (Using New Refrigerant Piping)
 1. Removing the unit
 a. Collecting the refrigerant into the outdoor unit by pumping down
The refrigerant can be collected into the outdoor unit (pumping down) by pressing the TEST RUN button, even when the
temperature of the room is low.
 • Check to make sure that the valve stems of the 2-way valve and 3-way valve have been opened by turning them counter-
clockwise. (Remove the valve stem caps and check to see that the valve stems arefully opened...

11.4.5. Recharging Refrigerant During Servicing
Whenrecharging is necessary, insert the specifie d amount of new refrigerant in accordance with the followin g procedure.
 1. Connec t the charging hose to the service port of the outdoor unit.
 2. Connec t the charging hose to the vacuum pump adaptor. At this time,fully open the 2-way valve and 3-way valve.
 3. Fully open the handle Lo of themanifold gauge, turn on the power of the vacuum pump and continue the vacuum process for
at least one hour.
 4....

11.4.6. Brazing
As brazing requires sophisticated techniques and experiences, it must be performed by a qualifie d person.
In order to prevent the oxide filmfrom occurring in the pipe interior during brazing, it is effective to proceed with brazingwhile letting
dry nitrogen gas (N
2) flow.

 1. Attach a reducing valve to the nitrogen gas cylinde r.
 2. Apply a seal onto the clearance between the piping and inserted pipe for the nitrogen gas in order to prevent the nitrogen gas
from flowing backward.
 3....

 • Electronic controller and Display Complete unit can be seen
by followin g the below removal procedures.
Fig. 1
 − Remove the 2 caps and 2 screws at the bottom of the
Front Grille. (Fig. 1)
Fig. 2
 − Remove the Front Grille Complete. (Fig. 2)
Fig. 3
 − Release the taps on top and on the right side of metal
plate cover. (Fig. 3)
 − Then remove the metal plate cover. (Fig. 3)
 − Remove the indicato r complete screw, and then remove
the indicato r complete. (Fig. 3)
12 Servicing Information
12.1....

Fig. 4
 − 
To remove the electronic controller.
 − 
Release CN-FM connectors. (Fig. 4)
 − 
Release CN-Sonic connector. (Fig. 4)
 − 
Release CN-FB connector. (Fig. 4)
 − 
Release CN-ION connector. (Fig. 4)
 − 
Release CN-TH connector. (Fig. 4)
 − 
Release CN-STM connector. (Fig. 4)
 − 
Release CN-REC/DISP connector. (Fig. 4)
 • 
Remove Control Board Cover
Fig. 6
 − 
Remove the screw on the left of the unit. (Fig. 6)
 − 
Pull the hook to the left and lift up the evaporator.
(Fig. 6)
 − 
Pull down the...

 − Release the generator complete wire (green and red).
(Fig. 8)
 − Remove 2 screws on the right and 1 screw at the left
side of the control board. (Fig. 7)
 − Press down the hook on the left side of control board.
(Fig. 7)
 − Then pull out the Control Board Completefrom the unit.
(Fig. 7)
Fig. 9
 − Remove the cross flow fan bushing from the chassis.
(Fig. 9)
 − Loosen the fan boss screw at the cross flow fan. (Fig. 9)
 • W hen the batteries are inserted for the first time or the
batteries are replaced,...

12.5. Auto OFF/ON Button
 • The“Auto OFF/ON Button”(behind the front grille) is used to operate the air conditio ner if remote control is misplaced or
mulfunctioning.
 • Forced cooling operation is possible by pressing the“Auto OFF/ON Button”for more than 5s where“beep”sound is heard then
release the button.
 • User able to select remote control transmission code and toggle remote control signal receiving sound under various setting
mode.
 • To enter various setting mode:
 − Press the“Auto OFF/ON...

In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insuffic ient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depend s on various conditio ns, the standard
values for them are shown in the table to the right.
13 Troubleshooting Guide
13.1. Refrigeration Cycle System
70
CS-W7DKR CU-W7DKR / CS-W9DKR...