Panasonic CS-TZ50TKEW / CU-TZ50TKE Service Manual ▷ View online
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13.6 Installation, Relocation, and Service
13.6.1 Air purge and gas leak test for new installation (using new refrigerant pipes)
using vacuum pump
(From the point of view of global environment protection, do not release CFCs into the atmosphere during installation
work)
1. Connect the charging hose of manifold gauge to the service port of 3-way valve (pushing insect pin).
2. Fully open the handle Lo of manifold gauge and operate vacuum pump.
work)
1. Connect the charging hose of manifold gauge to the service port of 3-way valve (pushing insect pin).
2. Fully open the handle Lo of manifold gauge and operate vacuum pump.
(If the needle of the low-pressure gauge reaches the vacuum immediately, check 1 procedure again)
3. Perform vacuuming 15 minutes or more, and make sure low pressure gauge reaches to －0.1 MPa (-76cmHg).
When the vacuuming completes, fully open the handle Lo of manifold gauge and stop the operation of vacuum
pump, and leave it for 1 ~ 2 minutes. Then, remove the connection side of the charging hose of vacuum pump
adopter after checking the needle of manifold gauge does not turn back.
pump, and leave it for 1 ~ 2 minutes. Then, remove the connection side of the charging hose of vacuum pump
adopter after checking the needle of manifold gauge does not turn back.
4. Open the stem of 2-way valve to 90° in anti-clock wise, and close the 2-way valve after 10 seconds, and perform
gas leakage test.
5. Remove the charge hose from the service port of 3-way valve, and open the stems of 2-way and 3-way valves
(open the valves to anti-clock wise carefully, do not use full strength to open)
6. Tighten the service port cap with torque wrench 18
N•m (1.8 kgf•m)
Tighten the caps of 2-way and 3-way valves with torque wrench 18 N•m (1.8kg f•m)
7. After the tightening of each cap, check gas leakage around the cap.
Liquid side
Gas side
2-way valve
Valve stem caps
Service
port cap
port cap
Service port
valve core
valve core
-0.1 MPa
(-76cmHg)
Lo Handle
Vacuum pump
adaptor
Vacuum
pump
3-way valve
Manifold gauge
Hi Handle
High-pressure
gauge
gauge
Low-pressure
gauge
Charging hoses
Hex wrench
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13.6.2 Process of refrigerant recovery
1. Connect the center charging hose of manifold gauge to the in-let side of recovery device.
2. Connect the valves of the discharge side of recovery device and liquid side of refrigerant cylinder with red hose
2. Connect the valves of the discharge side of recovery device and liquid side of refrigerant cylinder with red hose
(charging hose).
3. Connect the yellow float switch cable of the recovery device to the refrigerant cylinder.
4. Open the low pressure side valve of manifold gauge.
5. Slightly loosen the charging hose of in-let connecting side of recovery device and perform air purge.
6. Open the liquid valve of refrigerant cylinder and slightly loosen the charging hose in discharging side of recovery
4. Open the low pressure side valve of manifold gauge.
5. Slightly loosen the charging hose of in-let connecting side of recovery device and perform air purge.
6. Open the liquid valve of refrigerant cylinder and slightly loosen the charging hose in discharging side of recovery
device, and perform air purge (the recovery cylinder needs slight inside pressure).
7. Insert electric plug of recovery device into electrical outlet (the fan operation starts).
8. Turn the valve 1 and 2 of recovery device to pressure equalization point.
9. After a few seconds, turn back the valve 1 and 2 to the original position.
10. Turn the switch of the recovery device to “ON”. (the compressor operation starts)
11. When the low pressure of manifold gauge is close to “0”, close the low pressure side valve, turn “OFF” the
8. Turn the valve 1 and 2 of recovery device to pressure equalization point.
9. After a few seconds, turn back the valve 1 and 2 to the original position.
10. Turn the switch of the recovery device to “ON”. (the compressor operation starts)
11. When the low pressure of manifold gauge is close to “0”, close the low pressure side valve, turn “OFF” the
recovery device switch.
12. Remove the center charging hose of manifold gauge from the recovery device.
(Liquid side)
(Indoor unit)
(Outdoor unit)
(Gas side)
Two-way valve
Close
Close
Three-way valve
Hi
Lo
Vacuum
Pump
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13.6.3 Relocation
1. Removing the air conditioning unit
a) Recovery of outdoor unit refrigerant by pumping down
Press “forced cooling button” (as a general rule, since 1998 the name of cooling testing button is changed,
and this name is unified within the air conditioning industry), and then you are able to start cooling operation
in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.
1. Check the valve stems of two-way and three-way valves are open by being turned to anti-clockwise
and this name is unified within the air conditioning industry), and then you are able to start cooling operation
in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.
1. Check the valve stems of two-way and three-way valves are open by being turned to anti-clockwise
(Remove the caps, and confirm the bars are fully open. Use hexagon wrench <4 mm> to open and close
the valves).
the valves).
2. Press the “Emergency Operation” button of the indoor units for five seconds and release [Forced cooling
operation] (for old models, press “forced cooling” button). Then, operate the air conditioning unit for about
10 minutes.
10 minutes.
3. Turn the stem of the two-way valve to the clock-wise and close the valve.
4. After about 2 ~ 3 minutes, turn the stem of the three-way valve quickly to the clock-wise, and stop the
4. After about 2 ~ 3 minutes, turn the stem of the three-way valve quickly to the clock-wise, and stop the
operation.
Caution: In the pump down operation, stop the compressor before removing the refrigerant pipes.
If you do not stop the compressor operation, and if the valve is open and remove the refrigerant pipes, the air
may be sucked into the system and causes extreme high temperature in the refrigerant cycle. This may result in
rupture or injury, etc.
If you do not stop the compressor operation, and if the valve is open and remove the refrigerant pipes, the air
may be sucked into the system and causes extreme high temperature in the refrigerant cycle. This may result in
rupture or injury, etc.
5. Attach and tighten the caps of two-way and three-way valves with torque wrench.
6. Remove the connecting pipes (liquid side and gas side).
6. Remove the connecting pipes (liquid side and gas side).
b) Removal of indoor and outdoor units
1. Remove the connecting pipes and wires between the indoor and outdoor units.
2. Attach capping flare nuts on the edges of the pipes, connecting the indoor and outdoor units, in order to
prevent dust and moisture get into the pipes.
3. Remove the indoor and outdoor units.
2. Unit
installation
Use new refrigerant pipes for the installation, and perform air purging using vacuum pump and gas
leakage testing stated in 14.5.1.
leakage testing stated in 14.5.1.
13.6.4 Replacement of air conditioning units and evacuation (when re-using the existing
pipes)
When replacing the air conditioning units, you might use the existing pipes, but it is recommended to perform flaring
again. In case of unit replacement, even if the unit is new refrigerant air conditioner, if the refrigerant oil is different, it
may cause problem. Further, when re-using the existing refrigerant pipes, it is recommended to evacuate the pipes
as much as possible, due to the reason that much refrigerant oil may be attached on the surface of the pipes. If the
pipes are used without evacuation, the remaining refrigerant oil may cause under-performance and abnormal
refrigerant cycle caused by non-compatibility of those oils.
again. In case of unit replacement, even if the unit is new refrigerant air conditioner, if the refrigerant oil is different, it
may cause problem. Further, when re-using the existing refrigerant pipes, it is recommended to evacuate the pipes
as much as possible, due to the reason that much refrigerant oil may be attached on the surface of the pipes. If the
pipes are used without evacuation, the remaining refrigerant oil may cause under-performance and abnormal
refrigerant cycle caused by non-compatibility of those oils.
13.6.5 Inter-changeability of refrigerant
Do not operate air conditioning units inserting wrong (or mixed) refrigerant (R22, R410A, R32). It may cause mal-
function of the units, and at the same time, may cause serious incident such as rupture of the refrigerant cycle.
function of the units, and at the same time, may cause serious incident such as rupture of the refrigerant cycle.
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13.6.6 Re-insertion of refrigerant in service
When re-insertion is needed, follow the procedures to ensure the insertion of new refrigerant at correct amount.
1. Attach charging hose (blue) to the service port of the outdoor unit.
2. Attach charging hose (red) to the vacuum pump. Fully open the 2-way and 3-way valves.
3. Place the refrigerant cylinder on the digital scale for refrigerant charging and connect the charge hose (yellow) to
1. Attach charging hose (blue) to the service port of the outdoor unit.
2. Attach charging hose (red) to the vacuum pump. Fully open the 2-way and 3-way valves.
3. Place the refrigerant cylinder on the digital scale for refrigerant charging and connect the charge hose (yellow) to
the connection port of the vacuum pump and the digital scale. Leave the cylinder valve fully open.
4. Fully open the handles Lo and Hi of the manifold gauge, and switch on the vacuum pump, and then perform
evacuation for at or more than one hour.
5. Confirm the compound gauge of -0.1 MPa (-76cmHg) and fully open the handles of Lo and Hi, and switch off the
vacuum pump. Leave it for about 1 ~ 2 minutes and confirm the needle of the compound gauge does not turn
back.
Refer to the picture below to follow the procedures below.
back.
Refer to the picture below to follow the procedures below.
6. Remove the charging hose (red) of the manifold gauge from the vacuum pump adopter.
7. After adjusting the digital scale to zero, open the cylinder valve and the valve Lo of the manifold gauge, and
7. After adjusting the digital scale to zero, open the cylinder valve and the valve Lo of the manifold gauge, and
insert the refrigerant.
8. If it is not possible to insert the refrigerant at regulated amount at once, operate the cooling mode and gradually
insert the refrigerant (recommended amount approx. 150 g / 1 time)
*Do not insert much refrigerant at once.
*Do not insert much refrigerant at once.
9. Close the open/close valve and insert the refrigerant in the charging hose to the outdoor unit.
*Perform this procedure during operating cooling operation. Close the stem of the two-way valve, and when the
pressure of the manifold gauge becomes zero (0), quickly remove the charging hose (blue). Immediately open
the 2-way valve, and stop the cooling operation.
pressure of the manifold gauge becomes zero (0), quickly remove the charging hose (blue). Immediately open
the 2-way valve, and stop the cooling operation.
10. Final checking • • • Confirm the 2-way and 3-way valves are fully open.
Attach the caps of the service port and control valve, and then check the gas leakage around the caps.
(Liquid side)
(Indoor unit)
(Outdoor unit)
(Gas side)
Two-way
valve
Open
Open
Three-way
valve
Hi
Lo
Vacuum
pump
adaptor
Vacuum
pump
Vacuum pump
charging hose
Electronic scale
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