Panasonic S-36PU1E5 - Page 184

1
1-178
Application for ether-based oil
Dimensions when adding fl are nuts and the tightening torque
Precautions for flare nut installation
Piping size Tightening torque Flare section dimensions A Flare confi
guration
ø 6.35
14.2N•m ~ 17.2N•m
(1.4kgf•m ~ 1.7kgf•m)
8.7 ~ 9.1
90° ± 2°
45° ±1°
ø 9.52
32.7N•m ~ 39.9N•m
(3.3kgf•m ~ 4.0kgf•m)
12.8 ~ 13.2
ø 12.7
49.5N•m ~ 60.3N•m
(5.0kgf•m ~ 6.0kgf•m)
16.2 ~ 16.6
ø 15.88
68.0N•m ~ 75.5N•m
(6.8kgf•m ~ 7.6kgf•m)
19.3 ~ 19.7
After piping connection has completed, ensure there is no gas leakage.
When tightening the fl are nut, coat the fl ares (inner surface only) with refrigerant oil
on the fl ares
Firstly, screw in 3-4 turns by hand.
Ensure not to get oil on the screw part.
Refrigerant oil used is ether-based.
Once the piping connections are completed, perform leakage inspection using nitrogen
gas.
Outdoor unit
3-way
valve
Indoor unit
Once the piping connections are completed, perform
leakage inspection using nitrogen gas (leak tightness test)
using the 3-way valve for the outdoor unit and then close
it.
(Test the pressure with 3.8 MPa)
Ensure to use a vacuum pump (with a back-fl
ow prevention
device) for inside the refrigerant system.
Vacuuming process will take place after the leak test.
Ensure to fi ll only with liquid refrigerant when refi lling.
If gas refrigerant is fi lled, the refrigerant composition will
not be balanced and will cause abnormal operation.
Cylinder with
a siphon tube
Liquid refrigerant
Siphon tube
Cylinder
Cylinder
Gas refrigerant
Possible
(For refi lling due to a leak)
Not possible
VACUUM PURGING
Use nitrogen gas for the leak tightness test.
Using fl ammable gas can cause an explosion.
Pressure
meter
Nitrogen Refrigerant
meter
Vacuum
pump
REGARDING REFRIGERANT FILLING
Precautions during refrigerant fi lling
Charging with refrigerant
If using cylinders as shown in the bottom left diagram; without
a siphon tube inside, turn it upside down and use it.
(It is recommended to use the manifold with the side glass.)
Use tools that are designed specifi cally for R410A, for pressure resistance and to prevent mixing impurities.
Fill the refrigerant from the 3-way valve’s service port on the liquid-side.
For fi lling and replacing all refrigerant
For refi lling refrigerant, fi rst collect all residual refrigerant and after vacuum dehydration using the vacuum pump. Refi ll the
refrigerant according to the prescribed amount stated on the placard affi xed to this unit.
Precautions after the pipes’ connection have completed
Ensure to open the 3-way valve after completing the piping installation, leak test and vacuuming. If it is closed during
operation, it can lead to compressor failure.
At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 30m.
If the equivalent pipe length used will be 30m or less, no additional charging will be necessary.
If the equivalent pipe length will be between 30 and 50 / 75m, charge with additional refrigerant according to the equivalent
length given in the table below.
For standard type
Liquid refrigerant
Additional charging amount Equivalent length Minimum length
m
5m05m/g05P17/06-U
m
5m
5
7
m
/
g
0
5
P
0
4
1
/
5
21
/
0
01-
U
SM830211-02PAC-i.indb178SM830211-02PAC-i.indb178 2012/07/1713:56:592012/07/1713:56:59