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Installation Procedures
12. Refrigerant Tube
Pipe Length & Height Difference
Please refer to the attached manual of outdoor units.
Piping Materials & Heat Insulating Materials
As to prevent condensation, heat insulating treatment
should be performed. The heat insulating treatment
for gas and liquid piping should be done respectively.
Tubing Materials & Specifications
Model
Gas pipe
Tubing Size
Liquid pipe
Tubing Material
Refrigerant Recharge Amount
Add the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant must be
performed with a digital scale to ensure the proper charge. Compressor failure can be caused by over or under charging
the system.
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
Cutting and Enlarging
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.
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.
Piping Material
Heat Insulating Material
MVAH009~018MV2AA
1/2
1/4
Seamless copper pipe rated for R410A refrigerant
wrench
Hard PVC tube VP 1in (inner bore)
Vesicant polythene thickness: over 1/4in
MVAH024~048MV2AA
5/8
3/8
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 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.
correct
pressing
12
Connecting
circular terminals:
terminal tier
wrong
pressing
pressing clip
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