Panasonic S-45PU1E5 Technical Data & Service Manual page 373

Precautions for flare nut installation
Dimensions when adding flare nuts and the tightening torque
Piping size
14.2N•m ~ 17.2N•m
ø 6.35
{1.4kgf•m ~ 1.7kgf•m}
32.7N•m ~ 39.9N•m
ø 9.52
{3.3kgf•m ~ 4.0kgf•m}
49.5N•m ~ 60.3N•m
ø 12.7
{5.0kgf•m ~ 6.0kgf•m}
68.0N•m ~ 75.5N•m
ø 15.88
{6.8kgf•m ~ 7.6kgf•m}
After piping connection has completed, ensure there is no gas leakage.
When tightening the flare nut, coat the flares (inner surface only) with
refrigerant oil on the flares
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.
VACUUM PURGING
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 :
3.8 MPa : Type PE1
4.15 MPa : Type PEY1
Ensure to use a vacuum pump (with a back-flow
prevention device) for inside the refrigerant system.
Vacuuming process will take place after the leak test.
REGARDING REFRIGERANT FILLING
Precautions during refrigerant filling
Ensure to fill only with liquid refrigerant when
refilling. If gas refrigerant is filled, the refrigerant
composition will not be balanced and will cause
abnormal operation.
Liquid refrigerant
Cylinder with
a siphon tube
Use tools that are designed specifically 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 filling and replacing all refrigerant
For refilling refrigerant, first collect all residual refrigerant and after vacuum dehydration using the vacuum
pump. Refill the refrigerant according to the prescribed amount stated on the placard affixed 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.
Tightening torque Flare section dimensions A
Siphon tube
(For refilling due to a leak)
8.7 ~ 9.1
12.8 ~ 13.2
16.2 ~ 16.6
19.3 ~ 19.7
Use nitrogen gas for the leak tightness test.
Using flammable gas can cause an explosion.
Pressure
meter
Nitrogen Refrigerant
meter
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.)
Gas refrigerant
Not possible
Possible
Cylinder
1-363
(unit: mm)
Flare configuration
Application for ether-based oil
Outdoor unit
3-way
valve
Indoor unit
Vacuum
pump
Liquid refrigerant
Cylinder
1