Haier MRV5-H - Page 230

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<Notes>
• Please do not let any type of gas other than the specied 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 Phosphorized copper seamless pipe for air conditioner (TP2)
Model 112B 180B 280B
Function
High pressure gas pipe 1/2 (12.7) 5/8 (15.88) 3/4 (19.05)
Suction gas pipe 5/8 (15.88) 5/8 (15.88) 7/8 ( 22.22)
Liquid pipe (outdoor side) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52)
Gas pipe (indoor side) 5/8 (15.88) 5/8 (15.88) 7/8 ( 22.22)
Liquid pipe (indoor side) 3/8 (9.52) 3/8 (9.52) 3/8 (9.52)
Wall thickness and size: select proper sizes according to Selection of piping dimensions
• For the permissible maximum length, permissible elevation di󰀨erence 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 specied in the table in order to prevent water, foreign matter and dust
from entering the pipes.
Attention item for piping connection
Location Work period Maintenance method
Outdoors
More than 1 month Screw
Less than 1 month
Screw or strap
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.
• 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 x the box and connecting pipes in an e󰀩cient way to avoid shaking when
changing valve box.
• For the sizes of the ares, please refer to <Table-3>.
<Note>
• For connection at a are, apply ester or ether oil to the are (both inner surface and outer surface). Apply such oil
for 3 to 4 times and insert the screw in the rst use (Refer to Fig.9).
• The tightening torque for the are is given in <Table-3>.
If no torque wrench is available, act as the follows.
Use a spanner to tighten the nut of the are 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.