352
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
Pipe Materials & Specications
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 specied amount or compressor failure can be caused by lling
too much or little refrigerant.
Connecting Procedures of Refrigerant Tubing
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 conrm 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 AD302-482MNERA
Tubing Size (mm)
Gas pipe Φ15.88
Liquid pipe 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
Φ19.05 97.2~118.6N
.
m
W
C
T
P
W
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