4.2 Installation of the Connection Pipe
Connecting piping for
the
indoor unit and outdoor unit are in
the
manifold mode
(see the figure below).
Fig 6
4.2.1 Piping between the Indoor and Outdoor Units
(1) If the liquid and gas stop valves
,
which have the sign A , B, C, D or E
,
have not been connected to the
indoor units, turn off the screw cap with the spanner airproof.
(2) Refer to Fig.7 for the
appropriate amount
of torque
to tighten the
screws.
(3)
Point
the flare end of the copper pipe at the screw and tighten the screw by hand.
(4)
Next
, tighten the screw
with
the torque wrench
until
it
emits a sound
(as shown in Fig.7).
(5) The bending degree of the pipe can not be too small; otherwise it will crack.
Use
a pipe tube
bender to bend the pipe.
(6) Wrap the exposed refrigerant pipe and the joints by sponge and then tighten them with the plastic tape.
P ip e
F la re N u t
S p a n n e r
Fid 7
1)
During the connection of the indoor unit and the refrigerant pipe, never pull
the
indoor unit joints
forcefully,
otherwise the capillary or other
pipes
may crack, which would result in leakage.
2)
The refrigerant pipe should be supported by brackets
.
Do not allow the
unit
to support the weight of the refrigerant pipe.
3) If the piping connection size of
the
outdoor unit does not match the piping connection size of
the
indoor unit, use the
piping connection dimension of
the
indoor unit.
Use
different-diameter joints which is installing on the place of
the piping connection to connect the indoor unit.
4) For the Free Match system, each pipe should be labeled to
indicate
which system it belongs to avoid mistaken
inaccurate piping.
4.2.2 Allowable pipe length and drop height among indoor and outdoor units
If the total refrigerant pipe length (liquid pipe) is
shorter
than that listed in the table below, no additional
refrigerant will be charged.
Table 6
Model
Total Liquid Pipe
Length
(a+b+c+d+e)
131.2ft
131.2ft
131.2ft
Pipe
diameter
Thickness of
copper tube
Tightening
torque
ĭ
1/4 inch
0315 inch
11
̚
22 ft·lbf
ĭ
3/8 inch
0315 inch
26
̚
29 ft·lbf
ĭ
1/2 inch
0315 inch
33
̚
37 ft·lbf
ĭ
5/8 inch
0.0394 inch
44
̚
48 ft·lbf
36K
42K
1
1
Specifications are subject to change without notice.
3
0
K
