Installation
24 I
nstallation
5.2.10 Set the wall conduit
5
.2.11 Set the supporter for the pipe.
5.2.12 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.
5.2.13 Connect the pipe to indoor unit and outdoor unit by using two spanners (Side discharge
outdoor unit).
Be sure to use two spanners and proper torque to fasten the nut, too large torque will damage the flare,
and too small torque may cause leakage. Refer the following table for different pipe connection.
Torque Sketch map
Pipe Diameter
(k
gf.cm) (N.cm)
1/4" (6.4) 144~176 1420~1720
3/8" (9.52) 333~407 3270~3990
1/2" (12.7) 504~616 4950~6030
5/8" (16) 630~770 6180~7540
3/4" (19) 990~1210 9270~11860
5.2.14 Connect the pipe to indoor unit and outdoor unit by brazing (Top discharge outdoor unit and
A
ir Handler indoor units)
Top discharge outdoor unit and air handler indoor units connections are copper-to-copper and should
be brazed with a phosphorous-copper alloy material such as Silfos-5 or equivalent. DO NOT use soft
solder. The outdoor units have reusable service valves on both the liquid and vapor connections. The
total system refrigerant charge is retained within the outdoor unit during shipping and installation. The
reusable service valves are provided to evacuate and charge per this instruction.
Serious service problems can be avoided by taking adequate precautions to assure an internally clean
and dry system.
CAUTION: Dry nitrogen should always be supplied through the tubing while it is being brazed, because the
temperature required is high enough to cause oxidation of the copper unless an inert atmosphere is provide.
The flow of dry nitrogen should continue until the joint has cooled. Always use a pressure regulator and
safety valve to insure that only low pressure dry nitrogen is introduced into the tubing. Only a small flow is
necessary to displace air and prevent oxidation.
Precautions should be taken to prevent heat damage to service valve by wrapping a wet rag around it
as shown in following picture. Also, protect all painted surfaces, insulation, during brazing. After brazing
cool joint with wet rag.
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