5
A. Refrigerant pipe connection
When fastening and loosing the nut,
operate with double spanners,
because only one spanner cannot
execute firmly.
If threading the nut as not aiming
at the center, the screw thread will
be damaged, further it will cause
leakage.
spanner
spanner
connector
nut
To ensure the efficiency, the pipe should be
as short as possible.
Daub the refrigerant oil on the connector and
the flare nut.
When bending the pipe, the bending semi-
diameter should be as large as possible
against the pipe being broken or bent.
When connecting the pipe, aim at the center
to thread the nut by hand and tighten it with
the double spanners.
Don't let the impurity such as sand, water etc
into the pipe.
Pipe connection method:
1. When welding the connector with hard solder, charge nitrogen into the pipe against oxidation.
Or the oxygen film in the pipe will clog the capillary and the expansion valve, even caue the
deathy accident.
2. The refrigerant pipe should be clean. If the water and the other impurity enter the pipe,
charge the nitrogen to clean the pipe. The nitrogen should flow under the pressure of about
0.5Mpa and when charging the nitrogen, stop up the end of the pipe by hand to enhance the
pressure in the pipe, then loose the hand (meanwhile stop up the other end).
3. The piping installation should be executed after the stop valves are closed.
4. Before welding the valve and the pipes, use the wet cloth to cool down the valve and the
pipes.
5. When the connection pipe and the branch pipe need to be cut down, please use the special
shears and cannot use the saw.
Cautions in piping installation:
Pipe material and specs selection
1.
Please select the refrigerant pipe of the below material.
Material: the phosphoric oxidize seamless copper pipe, model: C1220T-1/2H (diameter is
over 19.05); C1220T-0(diameter is below 15.88).
2.
Thickness and specs:
Confirm the pipe thickness and specs according to the pipe selection method(the unit is with
R410A, if the pipe over 19.05 is 0-type, the pressure preservation will be bad, thus it must be
1/2H type and over the min. thickness.
3.
The branch pipe must be from Airwell.
4.
When installing the stop valve, refer to the relative operation instruction.
5.
The pipe installation should be in the allowable range.
6.
The installation of branch pipe and gather pipe should be performed according to the relative
manual.
Installation procedure
