13
Refrigerant Filling 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 specified amount while compressor failure can be caused by filling too
much or little 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
Outer Diameter of Tubing
(mm)
Mounting Torque
(N-m)
Increase mounting Torque
(N-m)
Ø6.35
11.8(1.2kgf-m)
13.7(1.4kgf-m)
Ø9.52
24.5(2.5kgf-m)
29.4(3.0kgf-m)
Ø12.7
49.0(5.0kgf-m)
53.9(5.5kgf-m)
Ø15.88
78.4(8.0kgf-m)
98.0(10.0kgf-m)
wrench
Installation Procedures
Tubing Permissible Length & Height Difference
Please refer to the attached manual of outdoor units.
Tubing Permissible Length & Height Difference
Model
AC092MDERA
AC122
~
182MDERA
AC242
~
482MDER
Tubing Size (mm)
Gas pipe
Ø9.52
Ø12.7
Ø15.88
Liquid pipe
Ø6.35
Ø6.35
Ø9.52
Tubing Material
Phosphor deoxybronze seamless pipe (TP2) for air conditioner
Cutting and Enlarging
Connecting
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.
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.
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 main unit.]
Checkup for Air Leakage
Check if there is any leakage at the connecting part
and bonnet with hydrophone or soapsuds.
Connecting
circular
terminals:
correct
pressing
wrong
pressing
terminal tier
pressing clip
