12
Installation procedure
A. Refrigerant pipe connection
Pipe connection method:
Pipe material and specs selection
• To ensure the ef
fi
ciency, the pipe should be as short as
possible.
• Daub the refrigerant oil on the connector and the
fl
are
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.
• Fastening torque please refers to "pipe specs and
fastening torque" on page 15.
• Don't let the impurity such as sand, water etc into the
pipe. Antifouling measures refer to page 13.
When fastening and loosing the
nut, operate with double spanners,
because only one spanner cannot
execute
fi
rmly.
If threading the nut as not aiming
at the center, the screw thread
will be damaged, further it will
cause leakage.
spanner
connector
nut
spanner
Cautions in piping installation:
1. When welding the pipe with hard solder, charge nitrogen into the pipe against oxidation. The
pressure gauge should be set at 0.02MPa.Perform the procedure with nitrogen circulation.
Otherwise, the oxide
fi
lm in the pipe may clog the capillary and expansion valve resulting in
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
fl
ow 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. When welding the valve and the pipe, cool down the valve with wet towel.
5. When the connection pipe and the branch pipe need to be cut down, please use the special
shears and cannot use the saw.
6. When welding copper pipe, use the phosphor copper welding rod without any welding
fl
ux.
(welding
fl
ux will damage the piping system. The welding
fl
ux containing chlorine will corrode
pipe, especially, the welding
fl
ux with
fl
uorin will damage refrigeration oil.)
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:
Con
fi
rm 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 and the gather pipe must be from Haier.
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.
