Refrigerant piping
Connection
Page 31
5. Clamp flare form on the end of the pipe.
The end of the pipe must extend beyond
the flare form.
Flare form
Pipe
6.
Place flaring tool onto the form.
7.
Turn the handle of the flaring tool
clockwise until the pipe is fully flared. Flare
the pipe in accordance with the dimensions.
PIPING EXTENSION BEYOND FLARE FORM
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for cracks
and even flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit first,
then connect it to the outdoor unit. You should
first connect the low-pressure pipe, then the high-
pressure pipe.
1.
When connecting the flare nuts, apply a
thin coat of refrigeration oil to the flared
ends of the pipes.
2.
Align the center of the two pipes that you
will connect.
Indoor unit tubing
Flare nut
Pipe
3.
Tighten the flare nut as tightly as possible
by hand.
4.
Using a spanner, grip the nut on the unit
tubing.
5. While firmly gripping the nut, use a torque
wrench to tighten the flare nut according
to the torque values in above table.
NOTE:
Use both a spanner and a torque wrench
when connecting or disconnecting pipes to/from
the unit.
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Flare shape
Min.
Max.
Ø 6.35
R0.4~0.8
45
°±
2
90
°
±
4
A
Ø 9.52
Ø 12.7
Ø 16
Ø 19
Ø 22
65-67 N.m
(663-683 kgf.cm)
23.2/0.91
23.7/0.93
75-85N.m
(765-867 kgf.cm)
26.4/1.04
26.9/1.06
18-20 N.m
(183-204 kgf.cm)
8.4/0.33
8.7/0.34
25-26 N.m
(255-265 kgf.cm)
13.2/0.52
13.5/0.53
35-36 N.m
(357-367 kgf.cm)
16.2/0.64
16.5/0.65
45-47 N.m
(459-480 kgf.cm)
19.2/0.76
19.7/0.78
CAUTION
•
Ensure to wrap insulation around the piping.
Direct contact with the bare piping may
result in burns or frostbite.
•
Make sure the pipe is properly connected.
Over tightening may damage the bell mouth
and under tightening may lead to leakage.
