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10.4. Balance refrigerant of the 2-way,3-way walves
(Gas leakage)
(Indoor unit)
(Liquid side)
(Outdoor unit)
2-way
valve
(Gas side)
Open
3-way
valve
Open
Low
High
Open
Closed
Vacuum pump
Procedure
1.
2.
Leave the valve on the charge set closed.
Connect the charge hose with the push-pin to the
service port.
Confirm whether the pressure indicates more than 1
kg/cm G (0.1MPa).
Confirm that both the 3-way valve and 2-way valve are
set to the open position.
Connect the charge set to the 3-way valve’s service
port.
2
53
Turn on refrigerant reclaiming equipment to collect the
refrigerant until the needle indicates 0 (no refrigerant
is remaining).
4.
5.
Open the valve (Low side) on the charge set and
discharge the refrigerant until the gauge indicates 0.05
MPa (0.5 kg/cm G) to 0.1 MPa (1 kg/cm G).
2
2
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 G), discharge the refrigerant until the
gauge indicates 0.05 MPa (0.5 km/cm G) to 0.1 MPa (1
kg/cm 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.
2
2
2
3.Connect the charge set’s centre hose to refrigerant
reclaiming equipment.
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
10.5. Evacuation (Installation)
(No refrigerant in the refrigeration cycle)
(Indoor unit)
(Liquid side)
(Outdoor unit)
2-way
valve
(Gas side)
Open
3-way
valve
Open
Low
High
Open
Closed
Vacuum Pump
Procedure
1.
2.
Confirm that the gauge needle has moved toward -76cmHg
(-0.1MPa) [vacuum of 4 mmHg or less].
3.
4.
Vacuum oil
If the vacuum pump oil becomes dirty or depleted, replenish
as needed.
Connect the vacuum pump to the charge set’s centre hose.
Evacuation for approximately 1 hour.
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).
Disconnect the charge hose from the vacuum.
54
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
10.6. Gas charging
(After Evacuation)
(Indoor unit)
(Liquid side)
(Outdoor unit)
2-way
valve
(Gas side)
Open
3-way
valve
Open
Low
High
Open
Closed
Charging
cylinder
cylinder
Procedure
1.Connect the charge hose to the charging cylinder.
2.Purge the air from the charge hose.
3 Open the valve (Low side) on the charge set and charge
the system with liquid refrigerant.
Connect the charge hose which was disconnected 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.
Open the valve at the bottom of the cylinder and use a
screwdriver to 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.
.
If the system cannot be charged with the specified
amount of refrigerant, it can be charge 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.
5.Mount the valve stem nuts and the service port.
Stopping part-way will allow the refrigerant to be
discharged.
If the system has been charged with liquid refrigerant
while operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
Use a torque wrench to tighten the service port cap
to a torque of 1.8kgf.m (18 N.m)
Be sure to check for gas leakage.
55
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.
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
56
11
Disassembly of the parts
1. Open the intake grille and pull it to the horizontal
position. (Fig. 1)
2. Pull up the intake grille until it falls off.(Fig. 2)
Removal Procedure For Intake Grille
1.Remove the two caps at the discharge port (right and
left)
(Fig. 3)
2.Release the two screws under the both caps. (Fig. 4)
Removal Procedure For Front Grille
Cap
Fixing Screw
Fig. 3
Fig. 4
Fig. 2
Fig. 5
Front Grille
3.Pull out the front grille from the unit body. (Fig.5 )
Fig. 1
Opener
Opener
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
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