Panasonic Cs W7bkp Cs W9bkp Cs W12bkp Repair Manual

11.1.2. Pumping down
Procedure:
 1. Confirm that both the 2-way and 3-wayvalves are set to
the opened position.
 • Remove the valve stem caps and confirm that the valve
stems are in the opened position.
 • Be sure to use a hexagonal wrench to operate the valve
stems.
 2. Operate the unit for 10 to 15 minutes.
 3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-wayvalve.
 • Connect the charge hose with the push pin to the Gas
service port.
 4. Air purging of...

11.1.3. Evacuation of Re-installation
WHEN REINSTALLING AN AIR CONDITIONER, BE SURE TO
EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES
in the following procedure.
 1. Connect a charging hose with a push pin to the Low
side of a charging set and the service port of the 3-way
valve.
 • Be sure to connect the endof the charging hose with the
push pin to the service port.
 2. Connect the centre hose of the charging set to a
vacuum pump.
 3. Turn on the power switchof the vacuum pump and
make sure that the...

(Lack of refrigerant in the refrigeration cycle)
Procedure:
 1. Confirm that both the 2-way and 3-wayvalves are set to
the open position.
 2. Connect the charge set tothe 3-way valve’s service
port.
 • Leave the valve on the charge set closed.
 • Connect the charge hose with the push-pin to the
service port.
 3. Connect the charge set’s centre hose to refrigerant
reclaiming equipment.
 • Purge the air from charge hose.
 4. Open the valve(Low side) on the charge set and
discharge the refrigerant until the...

(No refrigerant in the refrigeration cycle)
Procedure:
 1. Connect the vacuum pump to the charge set’s centre
hose.
 2. Evacuation for approximately one hour.
 • Confirm that the gauge needle has moved toward -0.1
MPa (-76 cmHg) [vacuum of 4 mmHg or less.]
 3. Closethe valve(Low side) on thecharge set, turn off
the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning
off the vacuum pump).
 4. Disconnect the charge hose from the vacuum pump.
 • Vacuum pump...

(After Evacuation)
Procedure:
 1. Connect the charge hose to the charging cylinder.
 • Connect the charge hose which you disconnected from
the vacuum pump to the valve at the bottom of the
cylinder.
 2. Purge the air from the charge hose.
 • Open the valve at the bottom of the cylinder and press
the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
 3. Open the valve(Low side) on thecharge set and charge
the system with liquid refrigerant.
 • If the system cannot be...

Required tools: hexagonal wrench, adjustable wrench, torque
wrenches, wrench to hold the joints and gas leak detector.
The additional gas for air purging has been charged in the
outdoor unit.
However, if the flare connections have not been done correctly
and there gas leaks, a gas cylinder and the charge set will be
needed.
 1. Recheck the piping connections.
 2. Open thevalve stemof the2-wayvalvecounter-
clockwise approximately 90°, wait 10 seconds, and
then set it to closed position.
 • Be sure to use...

 1. Confirm that both the 2-way and 3-wayvalves are set to
the opened position.
 • Remove the valve stem caps and confirm that the valve
stems are in the opened position.
 • Be sure to use a hexagonal wrench to operate the valve
stems.
 2. Operate the unit for 10 to 15 minutes.
 3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-wayvalve.
 • Connect the charge hose with the push pin to the Gas
service port.
 4. Air purging of the charge hose.
 • Open the...

11.2.3. Re-air purging (Re-installation)
 1. Confirm that both the 2-way and 3-wayvalves are set to
the closed position.
 2. Connect the charge set and a charging cylinder to the
service port of the 3-wayvalve.
 • Leave the valve on the charging cylinder closed.
 3. Air purging.
 • Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the flare nut on
the 2-wayvalve approximately 45° for3 seconds then
closing it for 1 minute; repeat 3 times.
 • After purging the air, use...

(Gas leakage)
 1. Confirm that both the 2-way and 3-wayvalves are set to
the open position.
 2. Connect the charge set tothe 3-way valve’s service
port.
 • Leave the valve on the charge set closed.
 • Connect the charge hose with the push pin to the
service port.
 3. Open the valves(Low side) on the charge set and
discharge the refrigerant until the gauge indicates 0.5
to 1 kg/cm
2G (0.05 to 0.1 MPa) .
 • If there is no air in the refrigeration cycle [ the pressure
when the air conditioner is not running...

(No refrigerant in the refrigeration cycle)
 1. Connect the vacuum pump to the charge set’s centre
hose.
 2. Evacuation for approximately one hour.
 • Confirm that the gauge needle has moved toward -0.1
MPa (-76 cmHg) [vacuum of 4 mmHg or less.]
 3. Closethe valve(Low side) on thecharge set, turn off
the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning
off the vacuum pump).
 4. Disconnect the charge hose from the vacuum pump.
 • Vacuum pump oil
If the...