Kaysun KPD-105 DTN11, Installation Manual

Page: 21 / 40

21
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.
4
5
°
±
2
5.
Clamp flare form on the end of the pipe. The
end of the pipe must extend beyond the
flare form.
Flare form
Fig. 7.7
Pipe
Fig. 7.10
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 7.5.
Table 7.5: 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.
min-radius 10cm (3.9”)
Fig. 7.11
6.
After connecting the copper pipes to the
indoor unit, wrap the power cable, signal
cable and the piping together with binding
tape.
NOTE: DO NOT intertwine signal cable with other
wires. While bundling these items together, do not
intertwine or cross the signal cable with any other
wiring.
7.
Thread this pipeline through the wall and
connect it to the outdoor unit.
8.
Insulate all the piping, including the valves
of the outdoor unit.
Indoor unit tubing
Fig. 7.9
Flare nut
Pipe
9.
Open the stop valves of the outdoor unit to
start the flow of the refrigerant between the
indoor and outdoor unit.
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
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Flare shape
Min. Max.
Ø 6.4
18-20 N.m
(183-204 kgf.cm)
8.4/0.33 8.7/0.34
90
°±
4
Ø 9.5
25-26 N.m
(255-265 kgf.cm)
13.2/0.52 13.5/0.53
A
Ø 12.7
35-36 N.m
(357-367 kgf.cm)
16.2/0.64 16.5/0.65
R0.4~0.8
Ø 15.9
45-47 N.m
(459-480 kgf.cm)
19.2/0.76 19.7/0.78
Fig. 7.8
Ø 19.1
65-67 N.m
(663-683 kgf.cm)
23.2/0.91 23.7/0.93
Ø 22
75-85N.m
(765-867 kgf.cm)
26.4/1.04 26.9/1.06
CAUTION
CAUTION
NOTE: Use both a spanner and a torque wrench
when connecting or disconnecting pipes to/from
the unit.
•
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.
Check to make sure there is no refrigerant leak
after completing the installation work. If there is
a refrigerant leak, ventilate the area immediately
and evacuate the system (refer to the Air
Evacuation section of this manual).