Panasonic CS-C7DKD / CU-C7DKD / CS-C9DKD / CU-C9DKD / CS-C12DKD / CU-C12DKD Service Manual ▷ View online
(Lack of refrigerant in the refrigeration cycle)
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to
1. Confirm that both the 2-way and 3-way valves are set to
the open position.
2. Connect the charge set to the 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.
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 gauge indicates 0.05
MPa (0.5 kg/cm
MPa (0.5 kg/cm
2
G) to 0.1 MPa (1 kg/cm
2
G).
•
If there is no air in the refrigeration cycle (the pressure
when the air conditioner is not running is higher than 0.1
MPa (1 kg/cm
when the air conditioner is not running is higher than 0.1
MPa (1 kg/cm
2
G), discharge the refrigerant until the
gauge indicates 0.05 MPa (0.5 km/cm
2
G) to 0.1 MPa (1
kg/cm
2
G). If this is the case, it will not be necessary to
apply a evacuation.
•
Discharge the refrigerant gradually; if it is discharged
too suddenly, the refrigeration oil will also be
discharged.
too suddenly, the refrigeration oil will also be
discharged.
5. Turn on refrigerant reclaiming equipment.
11.1.4. Balance refrigerant of the 2-way, 3-way valves
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(No refrigerant in the refrigeration cycle)
Procedure:
1. Connect the vacuum pump to the charge set’s centre
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.]
MPa (-76 cmHg) [vacuum of 4 mmHg or less.]
3. Close the valve (Low side) on the charge set, turn off
the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning
off the vacuum pump).
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 vacuum pump oil becomes dirty or depleted,
replenish as needed.
If the vacuum pump oil becomes dirty or depleted,
replenish as needed.
11.1.5. Evacuation
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(After Evacuation)
Procedure:
1. Connect the charge hose to the charging cylinder.
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.
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).
the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3. Open the valve (Low 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 150 g 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 150 g 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)
This is different from previous procedures. Because you are
charging with liquid refrigerant from the gas side, absolutely do
no attempt to charge with large amount of liquid refrigerant
while operating the air conditioner.
charging with liquid refrigerant from the gas side, absolutely do
no attempt to charge with large amount of liquid refrigerant
while operating the air conditioner.
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 caps and the service port cap.
•
Use torque wrench to tighten the service port cap to a
torque of 18 N.m.
torque of 18 N.m.
•
Be sure to check for gas leakage.
11.1.6. Gas charging
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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.
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 the valve stem of the 2-way valve counter-
2. Open the valve stem of the 2-way valve counter-
clockwise approximately 90°, wait 10 seconds, and
then set it to closed position.
then set it to closed position.
•
Be sure to use a hexagonal wrench to operate the valve
stem.
stem.
3. Check for gas leakage.
•
Check the flare connection 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).
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.
remains in the refrigeration pipings, it will affect the
compressor, reduce the cooling capacity, and could lead to a
malfunction.
6. Set the 3-way valve to the opened position.
7. Mount the valve stem nuts to the 2-way and 3-way
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’s stem nuts, and from the service port
cap.
way and 3-way’s stem nuts, and from the service port
cap.
Caution
If gas leakage is discovered in step (3) above, take
the following measures:
the following measures:
If the 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.
11.2. Air Purging of the Piping and Indoor Unit
11.2.1. Air purging (Installation)
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.
Procedure:
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