Panasonic CS-MC90KA / CU-MC180KA / CS-MC90KA / CU-3MC200KA / CS-MC120KA / CU-MC240KA Service Manual ▷ View online
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MAC9902014C3
CS-MC90KA
4
Gas charging
(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.
from the vacuum pump to the valve at the bottom of
the cylinder.
●
If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can be
charged with liquid.
and reverse the cylinder so that the system can be
charged with liquid.
(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). The
procedure is the same if using a gas cylinder.
press the check valve on the charge set to purge
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
(3) Open the valve (Lo side) on the charge set and
charge the system with liquid refrigerant.
●
If the system cannot be charged with the specified
amount of refrigerant, it can be charged with a little
at a time (approximately 150g each time) while
operating the air conditioner in the cooling cycle;
however, one time is not sufficient, wait approximately
1 minute and then repeat the procedure. (pumping
down-pin).
amount of refrigerant, it can be charged with a little
at a time (approximately 150g each time) while
operating the air conditioner in the cooling cycle;
however, one time is not sufficient, wait approximately
1 minute and then repeat the procedure. (pumping
down-pin).
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
●
Stopping partway will allow the refrigerant to be
discharged
discharged
●
If the system has been charged with liquid refrigerant
while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
(5) Mount the valve stem nuts and the service port
cap.
●
Use a torque wrench CWHAD-9211 to tighten the service
port nut to a torque of 1.8 N•m.
port nut to a torque of 1.8 N•m.
●
Be sure to check for gas leakage.
(Gas side)
Charging
cylinder
cylinder
(Indoor unit)
(Liquid side)
3-way valve
Open
3-way valve
Open
OPEN
Hi
Lo
CLOSED
Check valve
(Outdoor unit)
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CS-MC90KA
MAC9902014C3
Shaft Position
Closed
(With valve cap)
Closed
(Clockwise)
Open
(With valve cap)
Open
(Counter-clockwise)
Open
Open
Open
Open
2-way Valve (Liquid Side)
3-way Valve (Gas Side)
Works
Shipping
Air Purging
Installation and
Re-installation
Operation
Pumping down
(Transferring)
Evacuation
(Servicing)
Gas charging
(Servicing)
Pressure check
(Servicing)
Gas releasing
(Servicing)
Shaft Position
Close
(With valve cap)
Closed
(Counter-Clockwise)
Open
(With valve cap)
Closed
(Clockwise)
Open
Open
Open
Open
2-way
•
3-way Valve
To outdoor unit
Valve cap
Service
port cap
port cap
Service port
To
piping
connection
piping
connection
Flare nut
To
piping
connection
piping
connection
Hexagonal wrench (4 mm)
Service Port
Closed
(With cap)
Open
(Push-pin)
Closed
(With cap)
Open
(Connected manifold
gauge)
Open
With vacuum pump
Open
(With charging cylinder)
Open
(Connected manifold
gauge)
Open
(Connected manifold
gauge)
Closed position
Flare nut
To outdoor unit
Open position
Open position
Closed position
Closed position
Pin
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CS-MC90KA
MAC9902014C3
1 Air purging (Installation)
Required tools: hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints and gas leak detector.
joints and gas leak detector.
The air in the indoor unit and in the piping must be purged.
If air remains in the refrigeration pipings, it will affect the
compressor, reduce the cooling capacity, and could lead
to a malfunction.
If air remains in the refrigeration pipings, it will affect the
compressor, reduce the cooling capacity, and could lead
to a malfunction.
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.
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.
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.
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.
(6) Set the 3-way valve to the opened position
(7) Mount the valve stem nuts to the 2-way and 3-way
valves
(8) Check for gas leakage
●
At this time, especially check for gas leakage from the
2-way and 3-way valve’s stem nuts, and from the service
port cap.
2-way and 3-way valve’s stem nuts, and from the service
port cap.
Procedure:
(1) Recheck the piping connections
(2) Open the valve stem of the 2-way valve counter-
clockwise approximately 90
°
, wait 10 seconds,
and then set it to closed position
●
Be sure to use a hexagonal wrench to operate
the valve stem.
the valve stem.
(3) Check for gas leakage
●
Check the flare connections for gas leakage.
(4) Purge the air from the system
●
Set the 2-way valve to the open position and remove the
cap from the 3-way valve’s service port.
cap from the 3-way valve’s service port.
●
Using the hexagonal wrench to press the valve core pin,
discharge for three seconds and then wait for one minute.
Repeat this three times.
discharge for three seconds and then wait for one minute.
Repeat this three times.
(5) Use torque wrench to tighten the service port cap
to a torque of 1.8 kg•m. (18 N•m)
Caution
If gas leakage is discovered in step (3) above,
take the following measures:
take the following measures:
If the gas leaks stop when the piping connections are
tightened further, continue working from step (4).
tightened further, continue working from step (4).
If the gas leaks do not stop when the connections are
retightened, repair the location of the leak, discharge
all of the gas through the service port, and then
recharge with the specified amount of gas from a gas
cylinder.
retightened, repair the location of the leak, discharge
all of the gas through the service port, and then
recharge with the specified amount of gas from a gas
cylinder.
Liquid side
Gas side
2-way
valve
OPEN
3-way
valve
Closed
Outdoor unit
(Indoor unit)
Close
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CS-MC90KA
MAC9902014C3
2 Pumping down (Re-installation)
Procedure:
(1) Confirm that both the 2-way and 3-way valves are
set to the open position
●
Remove the valve stem caps and confirm that the valve
stems are in the open position.
stems are in the open position.
●
Be sure to use a hexagonal wrench to operate the valve
stems.
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-way valve
3-way valve
●
Connect the charge hose with the push pin to the
service port.
service port.
(4) Air purging of the charge hose
●
Open the low-pressure valve on the charge set slightly
to air purge from the charge hose.
to air purge 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 1 kg/cm
2
G
(0.1 MPa)
●
If the unit cannot be operated at the cooling (weather is
rather cool), press the Pump Down Switch on the Indoor
unit. So that the unit can be operated.
rather cool), press the Pump Down Switch on the Indoor
unit. So that the unit can be operated.
(7) Immediately set the 3-way valve to the closed
position
●
Do this quickly so that the gauge ends up indicating
3 to 5 kg/cm
3 to 5 kg/cm
2
G. (0.3 to 0.5 MPa).
(8) Disconnect the charge set, and mount the
2-way and 3-way valve’s stem nuts and the service
port cap
port cap
●
Use torque wrench to tighten the service port cap to a
torque of 1.8 kg•m (18 N•m).
torque of 1.8 kg•m (18 N•m).
●
Be sure to check for gas leakage.
(Outdoor unit)
(Liquid side)
Lo
Hi
CLOSE
CLOSE
Open
3-way valve
2-way valve
(Gas side)
(Indoor unit)
Close
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