Panasonic CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD / CS-PA9DKD / CU-PA9DKD / CS-PC9DKD / CU-PC9DKD Service Manual ▷ View online
10 2-way,3-way Valve
2-way Valve (Liquid Side)
Works
Shaft Position
Shaft Position
Service Port
Shipping
Close
Closed
Closed
(With cap)
Air purging(Installation and Re-
installation)
Open
Closed
Open
(Counter-clockwise)
(clockwise)
(Push-pin)
Operation
Open
Open
Closed
(Counter-clockwise)
(With cap)
Pumping down
(Transferring)
Closed
Open
Open
(Clockwise)
(Counter-clockwise)
(Connected manifold
gauge)
Evacuation
(Servicing)
(Servicing)
Open
Open
Open
(With vacuum pump)
Charging
(Servicing)
(Servicing)
Open
Open
Open
(With charging cylinder)
Pressure check
(Servicing)
Open
Open
Open
(Connected manifold
gauge)
Gas releasing
(Servicing)
Open
Open
Open
(Connected manifold
gauge)
3-way Valve (Gas Side)
(With valve cap)
(With valve cap)`
49
(With valve cap)`
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
10.1. Evacuation of Installation
When installing an air conditioner, be sure to evacuate the air inside the indoor unit and pipes in the following procedure.
Required tools:
Hexagonal wrench, adjustable wrench, torque wrench,
wrench to hold the joints, gas leak detector, charging set
and vacuum pump.
The air in the indoor unit and in the piping must be purged.
If air remains in the refrigeration piping, it will affect the
compressor , reduce cooling capacity, and could lead to a
malfunction.
(Indoor unit)
(Liquid side)
(Outdoor unit)
2-way
valve
(Gas side)
Open
3-way
valve
Open
Low
High
Open
Closed
Service port cap
Be sure, using a torque wrench to tighten the service port cap(after using the service port),so that it prevents the gas leakage
from the refrigeration cycle.
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.
2.Connect the centre hose of the charging set to a
vacuum pump.
3.Turn on the power switch of the vacuum pump and
make sure that the needle in the gauge moves from 0
cmHg (0 Mpa) to -76 cmHg (-0.1 Mpa). Then evacuate
the air for approximately 10 minutes.
4.Close the valve of the Low side of the charging set
and turn off the vacuum pump. Make sure that the
needle in the gauge does not move after approximately
5 minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS REFRIGERANT LEAKAGE.
5.Disconnect the charging hose from the vacuum pump
and from the service port of the 3-way valve.
.
Be sure to connect the end of the charging hose with the
push pin to the service port.
6.Tighten the service port caps of both the 3-way valve
and the 2-way valve at a torque of18 N.m with a torque
wrench.
7.Remove the valve caps of both the 3-way and the 2-way
valves.
Position both of the valves to
using a hexagonal
wrench (4 mm).
8.Mount valve caps onto both of the 3-way valve and the
2-way valve.
“open”
50
Vacuum Pump
Caution
If gauge needle does not move from 0 cmHg(0 Mpa) to -76cmHg
(-0.1MPa) in step (3) above, take the following measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
(-0.1MPa) in step (3) above, take the following measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
repair the location of the leak.
Be sure to check for gas leakage.
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
(Indoor unit)
(Liquid side)
(Outdoor unit)
Open
2-way
valve
(Gas side)
Closed
3-way
valve
Closed
Closed
Low
High
10.2. Pumping down
(For Re-Installation)
Procedure
1.Confirm that both 2-way and 3-way valves are set to open
positions.
Remove the valve stem cap and confirm that the valve
stems are in the open position.
Be sure using a hexagonal wrench to operate the valve
stems.
2.Operate the unit for 10-15 minutes.
3.Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-way valve.
Connect the charge hose with the push pin to the
service port.
4.Air purging of the charge hose.
Open the low-pressure valve of the charge set slightly
to purge air from the charge hose.
5.Set the 2-way valve to the close position.
6. Operate the air conditioner at the cooling cycle and stop it
when the gauge indicates 2
G (0.1Mpa).
If the unit cannot be operated at the cooling mode
operation (weather is rather cold), short the Pumping
Down pins on the Main Control P.C.B.
7. Immediately set 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating
1 to 3
.
kg/cm
kg/cm G (0.1 to 0.3 Mpa).
8. Use refrigerant reclaiming equipment to collect refrigerant
from indoor unit and pipes.
9. Disconnect the charge set, and mount the 2-way and 3-way
valve stem s nuts and service port cap.
Use torque wrench to tighten the service port cap to a
torque 1.8kgf.m (18N.m).
Be sure to check for gas leakage.
10. Disconnect pipes from indoor unit and outdoor unit.
2
2
’
51
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
10.3.Re-air Purging
(Re-installation)
(Indoor unit)
(Liquid side)
(Outdoor unit)
2-way
valve
(Gas side)
Open
3-way
valve
Open
Low
High
Open
Closed
Vacuum Pump
Be sure to connect the end of the charging hose with the
push pin to the service port.
2.
3.
4.
1.Connect a charging hose with a push pin to the
Low
side of a charging set and the service port of a 3-way
valves.
Connect the centre hose of
the
charging
set
to a
vacuum pump.
Turn on the power switch of the vacuum pump and
make sure that the needle in the gauge moves from 0
cmHg (0 Mpa) to -76 cmHg (-0.1 Mpa). Then evacuate
the air for approximately 10 minutes.
Close the valve of the Low side of the charging set
and turn off the vacuum pump. Make sure
that the
needle in the gauge does not move after approximately
5 minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS REFRIGERANT LEAKAGE.
7.Tighten the service port caps of both the 3-way valve
and
the 2-way valve at a torque of 18 N.m with a
torque wrench.
8.Remove the valve caps of both the valves. Position
both of the valves to
using a hexagonal wrench
(4 mm).
9.Mount valve caps onto both the valves.
"open"
5.Disconnect the charging hose from the vacuum pump
52
Caution
If gauge needle does not move from 0 cmHg(0 Mpa) to -76cmHg
(-0.1MPa) in step (3) above, take the following measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
(-0.1MPa) in step (3) above, take the following measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
repair the location of the leak.
6.Charge the pipes and indoor unit with gas refrigerant
from 3-way valve service port, and then discharge the
refrigerant until low side ( gas side ) gauge needle
indicates 0.3 Mpa (3 kg/cm ).
2
BE SURE TO USE REFRIGERANT RECLAIMING
EQUIPMENT
WHILE
DISCHARGING
THE
REFRIGERANT.
Purge the air from charge set’s centre hose.
Be sure to check for gas leakage.
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
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