Haier MRV 5-RC VP1-112B Service Manual page 143

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-1>.
<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
• The tightening torque for the flare is given in <Table-1>.
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 -2>.
After the work, make sure there is no air leakage.
<Table-1>
Tube size Tightening torque (N.m)
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Ø22.22
Maintenance method
Screw
Screw or strap
Machined flare size A (mm)
14.2~17.2
32.7~39.9
49.5~60.3
61.8~75.4
97.2~118.8
117.2~138.8
8.7~9.1
12.8~13.2
16.2~16.6
19.3~19.7
23.7—23.9
28.2-28.5
140
Flare shape