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 specied amount while compressor failure can be caused by lling too
much or little refrigerant.
Connecting Procedures of Refrigerant Tubing
Proceed with the are tube connecting operation to connect all the refrigerant tubes.
• Dual wrenches must be used for connecting the indoor unit tubing.
• For mounting torque, refer to the table on the right.
wrench
Installation Procedures
Outer Diameter of Tub-
ing (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)
Cutting or enlarging pipes should be carried out by
installation personnel according to the operating
criterion, if the tube is too long or the are opening is
broken.
1. Connecting circular terminals:
The connecting method of the circular terminal is
shown in the Fig. Remove the screw, connect it to
the terminal tier after inserting it
through the ring at the end of the
lead and then tighten it.
2. Connecting straight terminals:
The connection method for circular
terminals is shown in the Fig. Loosen the screw before
inserting the line terminal into the terminal tier, tighten the
screw and conrm that it has been clamped by pulling the
line gently.
3. Pressing connecting line:
After line connection is completed, press the
connecting line with clips that should be pressed on the
protective sleeve of the connecting line.
Cutting and enlarging Connecting
Connecting
circular
terminals:
terminal tier
correct
pressing
wrong
pressing
pressing
clip
13
Vacuumize from the stop valve of outdoor units with
vaccum pump. Refrigerant sealed in indoor machine
is not allowed to use for vaccumization.
Vacuumizing
Open all the valves of outdoor units. [NB: oil balancing
stop valve must be shut up completely when only
connected one main Unit].
Open All Valves
Check if there is any leakage at the connecting part
and bonnet with hydrophone or soapsuds.
Check for Air Leakage
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