Haier MRV 5-RC VP1-112B Service Manual page 119

<Notes>
• Please do not let any type of gas other than the specified refrigerant go into the refrigeration system;
• In case of refrigerant leakage during operation, please replace the gas. (Fill the refrigerant at the outdoor unit)
Select piping material
• Make sure both the internal surface and external surface of the pipes are intact and are free from harmful
contaminants such as sulphur, oxide, foreign matter, cutting powder, grease and water.
• Please use the following materials for refrigerant pipe.
Pipe material
Model
High pressure gas pipe
Suction gas pipe
Function Liquid pipe (outdoor side)
Gas pipe (indoor side)
Liquid pipe (indoor side)
Wall thickness and size: select proper sizes according to Selection of piping dimensions
• For the permissible maximum length, permissible elevation difference and permissible length after branching,
please refer to the installation instructions or technical data attached to the outdoor unit.
• The branching pipe for the pipe must have refrigerant branching suite. For selection of refrigerant branching suite,
please refer to the installation instructions or technical data attached to the outdoor unit.
Piping maintenance
During installation, provide maintenance as specified in the table in order to prevent water, foreign matter and dust
from entering the pipes.
Location Work period
More than 1 month
Outdoors
Less than 1 month
Indoors ——
Note
Particularly when a pipe is to penetrate through a wall or extend to outdoors, make sure foreign matter and dust
etc cannot enter the pipe.
Attention item for piping connection
• To connect a pipe to or remove it from the valve box, do use pliers for screws and torque spanner;
• When installing the valve box, please fix the box and connecting pipes in an efficient way to avoid shaking when
changing valve box.
• For the sizes of the flares, please refer to <Table-3>.
<Note>
• For connection at a flare, apply ester or ether oil to the flare (both inner surface and outer surface). Apply such oil
for 3 to 4 times and insert the screw in the first use (Refer to Fig.9).
• The tightening torque for the flare is given in <Table-3>.
If no torque wrench is available, act as the follows.
Use a spanner to tighten the nut of the flare to a position where the tightening torque sharply increases.
The tightening angle for the position where the tightening torque sharply increases <Table -4>.
After the work, make sure there is no air leakage.
Phosphorized copper seamless pipe for air conditioner (TP2)
112B
Ø12.7
Ø15.88
Ø9.52
Ø15.88
Ø9.52
Maintenance method
Screw
Screw or strap
116
180B 280B
Ø15.88 Ø19.05
Ø15.88 Ø22.22
Ø9.52 Ø9.52
Ø15.88 Ø22.22
Ø9.52 Ø9.52