Refrigerant Pipe Connection - Lennox PISO-TECHO Installation Manual

Use the market brass pipe.
Be sure to use the same insulating materials when you buy the brass pipe. (More than
9mm thick)
2. Locate The Pipe
1) Drill a hole in the wall (suitable just for the size of the wall conduit, 90mm in general), then
set on the fittings such as the wall conduit and its cover.
2) Bind the connecting pipe and the cables together tightly with binding tapes. Do not let air
in, which will cause water leakage by condensation.
3) Pass the bound connecting pipe through the wall conduit from outside. Be careful of the
pipe allocation to do no damage to the tubing.
3. Connect the pipes.
4. Then, open the stem of stop valves of the outdoor unit to make the refrigerant pipe conne-
cting the indoor unit with the outdoor unit fluently flow.
5. Be sure of no leakage by checking it with leak detector or soap water.
6. Cover the joint of the connecting pipe to the indoor unit with the soundproof/insulating
sheath (fittings), and bind it well with the tapes to prevent leakage.

REFRIGERANT PIPE CONNECTION

1. Cut a pipe with a pipe cutter.
2. Insert a flare nut into a pipe and flare the pipe.
lean crude burr
90
Chart 15
Fasten the nut
Put the connecting tubing at the proper position,
wrench the nuts with hands then fasten it with
a wrench. (Refer to Chart a)
Caution
Too large torque will harm the bellmouthing and
too small will cause leakage. Please determine
the torque according to Table 2.
Use frozen oil
Bend the pipe with thumb
Chart 12
Outside-
diameter
6. 5mm
f
9.53mm
f
12.7mm
f
f 16mm
19mm
f
Min-radius 100mm
Chart 13
A(mm)
Max
3
8.7
12.4
15.8
19.0
23.3
Table 1
Tubing Size
9.53
f
12.7
f
f 19 9
8
Make the ends
straight
Chart 14
Min
8.3
12.0
15.4
18.6
Chart 16
22.9
Chart a
Torque
26~30
26~30
35~40
Table 2
. N m
. N m
. N m