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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 below:
( lndoor 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 R32 of refrigerant, the following methods can
be referred to:
R =
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.lnstallation of unit
Inclination
(Sectional view of hale through the wall)
otal length of
�
J
X0.024kg
quid pipe for
f
G
.5 diameter(m)
17
(
Outdoor unit
)
Wall pipe is sawed
off based on wall
thickness
otal length of
pipe for
X0.0 1 2kg
liquid
)
_
6.4 d1ameter(m
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