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4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
5. Clamp flare form onto the end of the pipe. The
end of the pipe must extend beyond the flare
form.
Flare form
Pipe
Fig. 7.4
Refrigerant Piping
Connection
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
shown in table 7.1.
Table 7.1: PIPING EXTENSION BEYOND FLARE
FORM
Pipe
Diamt.
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Flare shape
Min.
Max.
Ø 1/4
14.2-17.2 N.m
(144-176 kgf.cm)
8.3/0.3
8.3/0.3
R0.4~0. 8
45
°±
2
90
°
±
4
A
Fig. 7.5
Ø 3/8
32.7-39.9 N.m
(333-407 kgf.cm)
12.4/0.5
12.4/0.5
Ø 1/2
49.5-60.3 N.m
(504-616 kgf.cm)
15.4/0.6
15.8/0.6
Ø 5/8
61.8-75.4 N.m
(630-770 kgf.cm)
18.6/0.7
19/0.75
Ø 3/4
97.2-118.6 N.m
(990-1210 kgf.cm)
22.9/0.9
23.3/0.91
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for cracks
and even flaring.
Step 4: Connect pipes
First connect the copper pipes to the indoor unit,
then connect them 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 leak guard or refrigeration oil to
the flared mating ends of the pipes.
2. Align the center of the two pipes that you will
connect.
Indoor unit tubing
Flare nut
Pipe
Fig. 7.6
3. Tighten the flare nut by hand as tightly
as possible.
4. Using a spanner, grip the nut on the unit
tubing (using double wrenches).
5. While firmly gripping the nut, use a torque
wrench to tighten the flare nut according to
the torque values in table 7.1.
NOTE:
Use both a spanner and a torque wrench
when connecting or disconnecting pipes to/from
the unit to prevent twisting or other damage.
Fig. 7.7
CAUTION
•
Be sure 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 flare cone
and under-tightening may lead to leakage.
NOTE ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle
according to the diagram below.
DO NOT
bend
the tubing more than 90° or more than 3 times.
Bend the pipe with thumb
min-radius 10cm (4”)
Fig. 7.8
6. After connecting the copper pipes to the
indoor unit, wrap the power cable, signal
cable, and the piping together into a bundle
using binding tape.
NOTE:
While bundling these items together,
be careful not to intertwine or cross the signal
cable with any of the other wiring. Keep this wire
segregated.
7. Thread this pipeline through the wall and
connect it to the outdoor unit.
8. Insulate all piping, including the valves
of the outdoor unit.
9. Repeat this process one circuit at a time, for
each of the occupied circuits, starting with
circuit A (bottom) and working upwards.
C AUTION
DO NOT OPEN any of the valves until a complete
evacuation and leak checking procedure is
performed for each of the circuits, one at a time
(refer to the evacuation section of this manual).
Mark every pair of pipes to identify circuit letter.
Ø 7/8
109.5-133.7 N.m
(1117-1364 kgf.cm)
27/1.06
27.3/1.07
