DOWNLOAD Panasonic U-2E15GBE / U-2E18CBPG Service Manual ↓ Size: 2.48 MB | Pages: 47 in PDF or view online for FREE

21

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the
following procedure.

1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way valve.

• Be sure to connect the end of the charging hose with the push pin to the service port.

2. Connect the center hose of the charging set to a vacuum pump with check valve, or vacuum pump and vacuum pump

adaptor.

3. Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from 0 cmHg (0 MPa) to 

-76 cmHg (-0.1 MPa). Then evacuate the air approximately 15 minutes.

4. Close the  Low and High side valve of the charging set and turn off the vacuum pump. Make sure that the needle in the gauge

does not move after approximately five minutes.
Note: BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.

5. Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of 18 N

l

m with a torque wrench.

7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN” using a hexagonal

wrench (4 mm).

8. Mount valve caps onto the both 3-way valve.

• Be sure to check for gas leakage.

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1. Remove the control board cover from the unit by loosening the screw.

2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 x 1.5 mm

2

 flexible

cord, type designation 245 IEC 57 (H05RN-F) or heavier cord.

3. Secure the cable onto the control board with the holder (clamper).
4. Attach the control board cover in its original position with the screw.

1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap

the insulated piping end to prevent water from going inside the piping.

2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E

FOAM with thickness 6 mm or above.

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• Operation modes which can be selected using the remote control unit:

- Automatic, Cooling, Dry, Heating and e-ion operation mode.

• Types of operation modes which can be performed simultaneously

- Cooling operation and Cooling, Dry or e-ion operation
- Heating operation and Heating operation

•  Types of operation modes which cannot be performed simultaneously

- During cooling operation, heating operation is impossible at another indoor unit in another room.
- The priority is given to cooling operation if the cooling mode is selected first. In another room where heating mode is selected

afterward, the POWER LED blinks to indicate the heating operation is in standby condition, where the fan is stopped hence
no discharged air.

-  During heating operation, cooling operation is impossible at another indoor unit in another room.
- The priority is given to heating operation if the heating mode is selected first. In another room where cooling mode is selected

afterward, the POWER LED blinks to indicate the cooling operation is in standby condition, where the fan is stopped hence
no discharged air.

• Operation mode priority control

- The operation mode designated first by the indoor unit has priority.
- If the priority indoor unit stops operation or initiates the fan operation, the priority is transferred to other indoor units.

“Waiting” denotes the standby status in which the POWER LED blinks (ON for 2.5 seconds and OFF for 0.5 seconds) and the fan
is stopped. 

In the e-ion mode, priority is transferred to a non-priority unit.
Note 

• C: Cooling operation mode
• D: Dry operation mode
• H: Heating operation mode
• E: e-ion operation mode 

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• The compressor operation frequency is determined by room temperature, capacity, and model type.

a) When operation is started after the air conditioner has been stopped for more than one hour, the air conditioner operates at a 

high frequency which lowers the room temperature quickly for cooling (or raises it quickly for heating).

b) If two or more indoor units are operating simultaneously, the thermostat is set to OFF in one room; the automatic expansion

valve is closed to adjust the flow of refrigerant so as to control the room temperature.

c) When the thermostat is set to OFF during 1-room operation, the compressor and fan of the outdoor unit are stopped. (The

outdoor unit fan is stopped 30 seconds after the compressor stops).

d) It takes about 180 seconds to restart operation when the compressor has been stopped (Time delay safety control).

• During Heating operation, the deice operation judgment method:

According to outdoor heat exchanger temperature, operation time and outdoor air temperature.

• Deice operation

1. The outdoor heat exchanger temperature falls below 3°C continuously for 3 minutes.
2. During deice operation; the 4-way valve is switched to cooling cycle to melt the frost.
3. Deice operation ends about 12 minutes of operation or the temperature of heat exchanger rises above 25°C.