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2) Through the wall: upon the wall penetration, the pipeline for indoor and outdoor unit must be equipped
with wall cannula, to avoid damage of pipes and wires, as shown in Figure 16:
Indoor unit
Wall hole
3) Eliminate the negative pressure, evacuation, leaks in the connecting pipe, pipeline of indoor unit:
After installation of the unit connecting pipe and the indoor unit, first fill nitrogen into the connecting pipes
and the indoor unit pipe up to 2.4-3.0Mpa (absolute pressure); and maintain this pressure for 24 hours, the
change of this pressure should not be less than 0.03Mpa; Also check with soap bubbles for any leaks on
the connecting head and the welding position, the nitrogen is discharged after confirmation of no leakage,
after evacuated, the pressure should reach 130Pa (absolute pressure), and maintain this pressure for 24
hours, the variation of this pressure should not be greater than 20Pa, then open the valve to perform a trial
run, if the parameters of the condenser exceeds conventional regulations it needs additional R410A of
refrigerant, the following methods can be referred to:
Note: Upon sipping of the outdoor unit, the refrigerant has not been emptied, during installation, it should be
evacuated with vacuum pump.
4) Thermal insulation. After leak check of the pipeline and completion of the pressure test, and everything is
normal, the insulation layer can be wrapped, the requirements of the insulation layer is as following:
a.Piping insulation layer must be tightly wrapped, no crack is allowed.
b.Thickness not less than 8 mm.
c.After wrap of the insulation layer, the outer surface must be treated against rain, moisture (generally wrap
outside with cable ties).
d.When the air conditioner system is in cooling run, dew is definitely not allowed to be condensed on the
outer surface of the connecting copper pipe.
4.Installation guide
(Sectional view of hole through the wall)
Figure 16
（
（
Total length of
R=
× .024kg
0
liquid pipe for 9.5
diameter(m)
Outdoor unit
Inclination
Wall pipe is sawed off based
on wall thickness
2-5
Wall pipe
（
（
Total length of
+
× . 12kg
liquid pipe for 6.4
0 0
diameter(m)
19
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