Panasonic CS-MC90KH / CU-MC140KH / CS-MC90KH / CU-MC180KH / CS-MC90KH / CU-3MC200KH Service Manual ▷ View online
– 32 –
ORDER NO. MAC9807010C3
CS-MC90KH
2-1 Re-air purging
(Re-installation)
Procedure:
(1) Remove the cap nut from 3-way valves.
●
Remove the cap nut from 3-way valves after carefully
checked whether the piping connection was properly
and certainly done.
checked whether the piping connection was properly
and certainly done.
(2) Confirm that the valve in both 3-way valve
are set to the CLOSED.
(3) Connect the gas cylinder to the liquid-side (high-
pressure) 3-way valve and the charge set to the
gas side (low-pressure) 3-way valve.
gas side (low-pressure) 3-way valve.
●
Remove the flare nut from the service port to connect the
charge set and gas cylinder.
charge set and gas cylinder.
●
Close the valves on the gas cylinder and charge set.
(4) Air purging.
●
Open the valve on the gas cylinder.
●
Open the valve on the charge set, discharge for three
seconds and wait for one minute. Repeat this three
times.
seconds and wait for one minute. Repeat this three
times.
(5) Check for gas leakage.
●
Check the flare connections for gas leakage.
(6) Discharge the refrigerant.
●
Close the valve on the gas cylinder and discharge
the refrigerant until the gauge indicates 3 to 5 kg/cm
the refrigerant until the gauge indicates 3 to 5 kg/cm
2
G.
(7) Disconnect the charge set and the gas
cylinder.
(8) Mount the valve stem cap nuts and the flare nuts
for service port onto the 3-way valves.
(9) Mount the cap nut and service port nut onto the
3-way valves.
●
Be sure to use a torque wrench (CWHAD-9211) to
tighten the service port nut.
tighten the service port nut.
●
Be sure to check for gas leakage.
Charging cylinder
(Indoor unit)
(Outdoor unit)
(Gas side)
3-way valve
3-way valve
(Liquid side)
Lo
Hi
Closed
Open
OPEN
CLOSED
Untitled-19
6/26/00, 3:41 PM
32
– 33 –
ORDER NO. MAC9807010C3
CS-MC90KH
2-2 Balance refrigerant of the 3-way valves
(Gas leakage)
Procedure:
(1) Confirm that both the 3-way valve are set to the
open position.
(2) Connect the charge set to the Gas side 3-way
valve’s port.
●
Leave the valve on the charge set closed.
●
Connect the charge hose with the push pin to the
service port.
service port.
(3) Open the valves (Lo side) on the charge set and
discharge the refrigerant until the gauge indicates
0kg/cm
0kg/cm
2
G.
●
If there is no air in the refrigeration cycle [the pressure
w h e n t h e a i r c o n d i t i o n e r i s n o t r u n n i n g i s
higher than 1kg/cm
w h e n t h e a i r c o n d i t i o n e r i s n o t r u n n i n g i s
higher than 1kg/cm
2
G], discharge the refrigerant
until the gauge indicates 0.5 to 1kg/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.
discharged too suddenly, the refrigeration oil will
also be discharged.
(Outdoor unit)
3-way valve
(Indoor unit)
(Liquid side)
(Gas side)
3-way valve
Lo
Hi
OPEN
CLOSED
Open
Open
Untitled-19
6/26/00, 3:41 PM
33
– 34 –
ORDER NO. MAC9807010C3
CS-MC90KH
3 Evacuation
(No refrigerant in the refrigeration cycle)
Procedure:
(1) Connect the vacuum pump to the charge set’s
center hose.
(2) Evacuation for approximately one hour.
●
Confirm that the gauge needle has moved toward
–76 cmHg [vacuum of 4 mmHg or less].
–76 cmHg [vacuum of 4 mmHg or less].
(3) Close the valve (Lo 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).
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 vacuum pump oil becomes dirty or depleted,
replenish as needed.
If the vacuum pump oil becomes dirty or depleted,
replenish as needed.
3-way valve
3-way valve
OPEN
Vacuum pump
Lo
Hi
OPEN
(Indoor unit)
(Outdoor unit)
(Gas side)
(Liquid side)
Open
Open
Untitled-19
6/26/00, 3:41 PM
34
– 35 –
ORDER NO. MAC9807010C3
CS-MC90KH
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)
Untitled-19
6/26/00, 3:41 PM
35
Click on the first or last page to see other CS-MC90KH / CU-MC140KH / CS-MC90KH / CU-MC180KH / CS-MC90KH / CU-3MC200KH service manuals if exist.