Haier AB072MRERA - Page 434

426
Pipe Materials & Specications
Refrigerant Recharge Amount
Add 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 specied amount or compressor failure can be caused by lling
too much or little refrigerant.
Connecting Procedures of Refrigerant Tubing
Proceed the are 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
Vacuumizing
Open All Valves
Checkup for Air Leakage
Cutting or enlarging pipes should be proceeded
by installation personnel according to the
operating criterion if the tube is too long or are
opening is broken.
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 the valves of outdoor units. [NB: oil
balancing stop valve must be shut up completely
when connected one master unit.]
Check if there is any leakage at the connecting part
and bonnet with hydrophone or soapsuds.
Connecting
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 conrm 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.
Model AD182MHERA AD242-482MHERA
Tubing Size
(mm)
Gas pipe Φ12.7 Φ15.88
Liquid pipe Φ6.35 Φ9.52
Tubing
Material
Phosphor deoxy bronze seamless pipe (TP2) for air
conditioner
Outer diameter of tubing (mm) Mounting torque
Φ6.35 11.8~13.7N
.
m
Φ9.52 32.7~39.9N
.
m
Φ12.7 49.0~53.9N
.
m
Φ15.88 78.4~98.0N
.
m
Model AD722MHERA AD962MHERA
Tubing Size
(mm)
Gas pipe Φ25.4 Φ25.4
Liquid pipe Φ9.52 Φ9.52
Tubing
Material
Phosphor deoxy bronze seamless pipe (TP2) for air conditioner
W
L
G
C
A
W
D
A