172
Pipe Length & Height Difference
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 while compressor failure can be caused by too
much or less 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 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.
Please refer to the attached manual of outdoor units.
Outer diameter
of tubing (mm)
Mounting
torque (N.m)
Increase
mounting torque
(N.m)
Φ6.35 11.8 (1.2kgf.m) 13.7 (1.4kgf.m)
Φ9.52 24.5 (2.5kgf.m) 29.4 (3.0kgf.m)
Φ12.7 49.0 (5.0kgf.m) 53.9 (5.5kgf.m)
Φ15.88 78.4 (8.0kgf.m) 98.0 (10.0kgf.m)
Model AC092MCERA AC122-182MCERA
AC242MCERA
AC28~482MFERA
Pipe Size
(mm)
Gas pipe Φ9.52 Φ12.7 Φ15.88
Liquid pipe Φ6.35 Φ6.35 Φ9.52
Pipe
Material
Phosphor deoxy bronze seamless pipe (TP2) for air conditioner
W
C
T
P
W
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