DOWNLOAD Panasonic CU-4E27PBD / CU-5E34PBD Service Manual ↓ Size: 7.53 MB | Pages: 60 in PDF or view online for FREE

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š  If an awning is built over the unit to prevent direct 

sunlight or rain, be careful that heat radiation from 
the condenser is not obstructed. 

š  There should not be any animal or plant which 

could be affected by hot air discharged. 

š  Keep the spaces indicated by arrows from wall, 

ceiling, fence or other obstacles. 

š  Do not place any obstacles which may cause a 

short circuit of the discharged air. 

 

Refrigerant piping size 

Outdoor Unit 

CU-4E27*** 

CU-5E34*** 

Liquid - side 

ø 6.35 t0.8 

ø 6.35 t0.8 

Gas - side 

ø 9.52 t0.8 

*(ø 12.7 t0.8) 

ø 9.52 t0.8 

*(ø 12.7 t0.8) 

*In case of indoor is CS-E21***, CS-XE21***, 

CS-ME21***, CS-E24***, then ø 12.7 t0.8 gas-
pipe size must be used together with CZ-MA2P 
(pipe size expander) 

 

Outdoor Unit 

CU-4E27*** 

CU-5E34*** 

Equivalent length 

45 m 

45 m 

š  If total piping length of all indoor units exceed the 

equivalent length listed above, additional charge 
with 20g of refrigerant (R410A) for each additional 
meter of piping. 

 

 
 

 
 
 
 
 
 
 

 

Allowable piping length 

Outdoor Unit 

CU-4E27*** CU-5E34*** 

Allowable piping length of each indoor unit (min. ~ max.) 

3 m ~ 25 m 

3 m ~ 25 m 

Allowable total piping length of all indoor unit 

70 m or less 

80 m or less 

Height difference between indoor and outdoor unit 

Outdoor unit located on upper side 

 

15 m or less 

15 m or less 

Outdoor unit located otherwise 

 

7.5 m or less 

7.5 m or less 

Height difference between indoor unit 

Outdoor unit located on upper side 

 

7.5 m or less 

7.5 m or less 

Outdoor unit located otherwise 

 

15 m or less 

15 m or less 

 

 

 
 
 
 
 

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š  Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation 

guidelines below. 

š  For any of the below installation patterns, the wall height on the exhaust side should be 1200mm or less. 

 

 

š  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. 

 

 

 

Model A 

B 

C 

D 

CU-4E27***, 

CU-5E34*** 

620 mm 

170 mm 

20 mm 

380.5 mm

š  Remove the cabinet side plate (metal) from the 

unit by loosening six screws. 

 
Connecting The Piping To Outdoor Unit 

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. 

 

Do not over tighten, over tightening may cause gas leakage 

Piping size 

Torque 

1/4" [6.35 mm]  

[18N•m (1.8 kgf.m)] 

3/8" [9.52 mm] 

[42 N•m (4.3 kgf.m)] 

1/2" [12.7 mm] 

[55 N•m (5.6 kgf.m)] 

5/8" [15.88 mm] 

[65 N•m (6.6 kgf.m)] 

3/4" [19.05 mm] 

[100N•m (10.2 kgf.m)] 

 

 

 
 
 
 
 
 
 
 

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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. 

o

 

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 (0MPa) 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. 

o

 

Be sure to check for gas leakage. 

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 

 

š 

If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step e above take the following measure: 

- 

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

- 

If the leak does not stop when the connections are retightened, repair location of leak. 

- 

Do not release refrigerant during piping work for installation and reinstallation. 

- 

Take care of the liquid refrigerant, it may cause frostbite.