Haier AD482MPERA - Page 215

214
A. Refrigerant pipe connection
• To ensure the efciency, the pipe should be as short as possible.
• Daub the refrigerant oil on the connector and the ared 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 56.
• Don't let the impurity such as sand, water goes into the pipe.
Antifouling measures refer to Page 49.
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 good nitrogen circulation. Otherwise, the oxide 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 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 check 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 do not
use the saw.
6. When welding copper pipe, use the phosphor copper welding rod without any welding ux. (Welding ux will
damage the piping system. The welding ux containing chlorine will corrode pipe. Especially, the welding ux with
uorine will damage refrigeration oil.)
1. Please select the refrigerant pipe according to the below material.
Material: the phosphoric oxidize seamless copper pipe, model: C1220T-1/2H (diameter is over 19.05); C1220T-O
(diameter is below 15.88).
2. Thickness and specications: The unit is charged with R-410A.
O-type should not be used for the pipe which diameter is over 19.05, or poor pressure resistance will happen.
Therefore, 1/2H type with its thickness over min. regulation should be chosen.
3. The manifold pipe and branch pipe must be from JCI.
4. When installing the check valve, refer to the relative operation instruction.
5. The pipe installation should be in the allowable range.
6. The installation of manifold pipe and branch pipe should be performed according to the relative manual.
When fastening and loosing the
nut, operate with double spanners,
because only one spanner cannot
execute rmly.
If threading the nut without aiming
at the center, the screw thread will
be damaged, further it will cause
leakage.
Pipe connection method
Pipe material and specs selection
Spanner
Connector
Nut
Spanner