Connecting The Refrigerant Pipe - Vivax ACP-12CT35GECI Service Manual

Installation Manual

6.Connecting the refrigerant pipe

1)Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leaks.
Coat here with refrigeration oil
2)Align the centres of both flares and tighten the flares and tighten the flare nuts 3 or 4 turns by hand.
Then tighten them fully with the torque wrenches.
3)To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces in the flare. (Use refrigeration oil for
R410A.)
Flare nut tightening torque
Gas side
25/35 class
3/8 inch
32.7-39.9 N.m
(333-407kfg.cm)
6-1.Caution on piping handling
1)Protect the open end of the pipe against dust and moisture.
2)All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
(Bending radius should be 30 to 40mm or larger.)
6-2. Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the
following:
1)Insulation material: Polyethylene foam
Heat transfer rate:0.041 to 0.052W/mK(0.035 to 0.045kca/(mh
Refrigerant gas pipe's surface temperature reaches 110
Choose heat insulation materials that will withstand this temperature.
2)Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
G s a s d i
2 5 3 / 5 c a l s s
O.D. 9.55mm
T i h
3)Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Liquid side
50 class 25/35/50 class
1/2 inch 1/4 inch
49.5-60.3 N.m 14.2-17.2 N.m
(505-615kgf.cm) (144-175kgf.cm)
e
Liquid side
5 0 c a l s s
O.D. 12.7mm O.D. 6.4mm
k c n e s s 0 8 . m m
Wrench
Indoor unit tubing
Gas pipe
max.
Gas pipe
insulstion
G s a p p i e h t r e m l a n i u s a l o i t
2 5 3 / 5 c a l s s 5 c 0 a l s s
I.D. 12-15mm I.D. 14-16mm
T i h k c n e s s 1 0
Open-end wrench (fixed)
Flare nut
Connection pipe
Be sure to
place a cap.
If no flare cap is
available,cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wiring
Finising tape
Liquid pipe
n
thermal insulation
I.D. 8-10mm
m m M i . n
Liquid pipe
Liquid pipe
insulation
31