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5.
Insulate the copper pipe
Before test operation, the joint parts should
not be heat insulated.
6.
Flare the pipe
Insert a flare nut into the pipe before flaring
the pipe
According to the following table to flare the
pipe
Flare
dimension
Pipe
(mm)
diameter
Min
Max
1/4"
8.3
8.7
(6.35)
3/8"
12.0
12.4
(9.52)
1/2"
15.4
15.8
(12.7)
5/8"
18.6
19.1
(15.9)
3/4" (19)
22.9
23.3
After flared the pipe, the opening part must
be seal by end cover or adhesive tape to
avoid duct or exogenous impurity come into
the pipe.
7.
Drill holes if the pipes need to pass the
wall.
8.
According to the field condition to bend the
pipes so that it can pass the wall smoothly.
9.
Bind and wrap the wire together with the
insulated pipe if necessary.
10. Set the wall conduit
11. Set the supporter for the pipe.
12. Locate the pipe and fix it by supporter
For horizontal refrigerant pipe, the distance
between supporters should not be exceed
1m.
For vertical refrigerant pipe, the distance
between supporters should not be exceed
1.5m.
13. Connect the pipe to indoor unit and outdoor
unit by using two spanners.
Be sure to use two spanners and proper
torque to fasten the nut, too large torque
will damage the flare, and too small torque
A
Flare shape
90 ° 4
- +
A
R0.4~0.8
may cause leakage. Refer the following
table for different pipe connection.
Torque
Pipe
Diameter
(kgf.cm)
1/4" (6.35)
144~176
3/8" (9.52)
333~407
1/2" (12.7)
504~616
5/8" (15.9)
630~770
3/4" (19)
990~1210 9270~11860
12.4.3 Installation for the first time
Air and moisture in the refrigerant system have
undesirable effects as below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may
freeze and block capillary tubing.
● Water may lead to corrosion of parts in the
refrigerant system.
Therefore, the indoor units and the pipes
between indoor and outdoor units must be leak
tested and evacuated to remove gas and
moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent
on the indoor unit connections or outdoor unit
connections by a soft brush to check for
leakage of the connecting points of the piping. If
bubbles come out, the pipes have leakage.
1. Air purging with vacuum pump
41
Sketch map
(N.cm)
1420~1720
3270~3990
4950~6030
6180~7540
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