DOWNLOAD Panasonic CU-3E18JBE / CU-4E23JBE Service Manual ↓ Size: 7.68 MB | Pages: 75 in PDF or view online for FREE

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• Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines below.
• For any of the below installation patterns, the wall height on the exhaust side should be 1200mm or less.

• After selecting the best location, start installation to Indoor/

Outdoor Unit Installation Diagram.

1. Fix the unit on concrete or rigid frame firmly and

horizontally by bolt nut (ø10 mm).

2. When installing at roof, please consider strong wind and

earthquake.
Please fasten the installation stand firmly with bolt or
nails.

• Remove the control board cover (resin) from the unit by

loosening three screws

Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge. Make flare after inserting the
flare nut (locate at valve) onto the copper pipe.
Align center of piping to valves and then tighten with torque
wrench to the specified torque as stated in the table.

Model

A

B

C

D

CU-3E18***
CU-4E23***

613 mm

131 mm

16 mm

360.5 mm

Piping size

Torque

1/4” [6.35 N

•

m]

[18 N

•

m (1.8 kgf.m)]

3/8” [9.52 N

•

m]

[42 N

•

m (4.3 kgf.m)]

1/2” [12.7 N

•

m]

[55 N

•

m (5.6 kgf.m)]

5/8” [15.88 N

•

m]

[65 N

•

m (6.6 kgf.m)]

3/4” [19.05 N

•

m]

[100 N

•

m (10.2 kgf.m)]

Do not over tighten, over tightening cause gas leakage.

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1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3. Please make flare after inserting the flare nut onto the copper pipes.

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 gas side
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.

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 ten minutes.

4. Close the Low 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 TAKE 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 gas side 3-way valve at a

torque of 18 N

•

m with a torque wrench.

7. Remove the valve caps of both of the gas side and liquid

side 3-way valve. Position both of the valves to “OPEN”
using a hexagonal wrench (4 mm).

8. Mount valve caps onto the gas side and liquid side of the

3-way valve.

• Be sure to check for gas leakages.

• If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step 

 above take the following measure: 

- If the leak stops when the piping connections are tightened further, continue working from step 

.

- If the leak does not stop when the connections are retightened, repair the location of leak.
- Do not release refrigerant during piping work for installation and reinstallation. 
- Take care of the liquid refrigerant, it may cause frostbite. 

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1. Remove the control board cover metal from the unit by

loosening two screws.

2. Cable connection to the power supply through isolating

Devices (Disconnecting means).

• Connect approved type polychloroprene sheathed

power supply cord 3 x 2.5 mm

2

 245 IEC 57 type

designation or heavier cord to the terminal board, and
connect the others end of the cord to Isolating Devices
(Disconnecting means).

3. 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 or heavier
cord.

4. Connect the power supply cord and connecting cable

between indoor unit and outdoor unit according to the
diagram as shown.

5. For wire stripping and connection requirement, refer to the diagram below.
6. Secure the power supply cord and connecting cables onto the control board with the holder.
7. Attach the control board cover back to the original position with screw.

 This equipment must be properly earthed.

• Note: Isolating Devices (Disconnecting means) should have minimum 3.0 mm contact gap.
• Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason.

32

Use a material with good heat-resistant properties as the heat insulation for the
pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes
are not adequately insulated, condensation or water leakages may occur.

Liquid-side pipes Material shall

withstand 
120

°C or higher

Gas-side pipes