Haier AB072MRERA Service Manual page 479

Pipe Materials & Specifications
Model
Gas Pipe
Pipe Size (mm)
Liquid Pipe
Refrigerant Recharge Amount
Recharge the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant
must be performed with a measure gage to ensure the specified amount or compressor failure can be caused by
too much or less refrigerant.
Connecting Procedures of Refrigerant Tubing
Proceed the flare tube connecting operation to connect all the refrigerant tubes.
■ Dual wrenches must be used in the connection of indoor unit tubing.
■ Mounting torque refers to the right table.
Cutting and Enlarging
Cutting or enlarging pipes should be proceeded by
installation personnel according to the operating
criterion if the tube is too long or flare opening is
broken.
Vacuumizing
Vacuumize from the stop valve of outdoor units with
vacuum pump. Refrigerant sealed in indoor machine
is not allowed to use for vacuumization.
Open All Valves
Open all the valves of outdoor units. [NB: oil
balancing stop valve must be shut up completely
when connected one master unit.]
Checkup for Air Leakage
Check if there is any leakage at the connecting part
and bonnet with hydrophone or soapsuds.
AE072/092MLERA AD122/162/182MLERA
Φ9.52
Φ6.35
Outer diameter
of tubing (mm)
Φ6.35
Φ9.52
Φ12.70
Φ15.88
Enlarge
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1. Connecting circular terminals:
The connecting method of circular terminal is
shown in the Fig. Take off the screw, connect it to
the terminal tier after heading it through the ring at
the end of the lead and then tighten it.
2. Connecting straight terminals:
The connection methods for the circular terminals
are shown as follows: loosen the screw before
putting the line terminal into the terminal tier, tighten
the screw and confirm it has been clamped by
pulling the line gently.
3. Pressing connecting line:
After connecting line is completed, press the
connecting line with clips which should press on the
protective sleeve of the connecting line.
471
Φ12.7
Φ6.35
Mounting torque
(N.m)
11.8 (1.2kgf.m)
24.5 (2.5kgf.m)
49.0 (5.0kgf.m)
78.4 (8.0kgf.m)
Connecting
AE242MLERA
Φ15.88
Φ9.52
Increase mounting
torque (N.m)
13.7 (1.4kgf.m)
29.4 (3.0kgf.m)
53.9 (5.5kgf.m)
98.0 (10.0kgf.m)