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11
Installation Procedures
Pipe Length & Height Difference
Please refer to the attached manual of outdoor units.
Model MVAW007~018 MVAW024~030
Tubing Size
in(mm)
Gas pipe Ø1/2"(Ø12.7) Ø5/8"(Ø15.88)
Liquid pipe Ø1/4"(Ø6.35) Ø3/8"(Ø9.52)
Tubing Material Seamless copper pipe rated for R410A refrigerant
Tubing Materials & Specications
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.
Refrigerant Recharge Amount
Proceed the are tube connecting operation to connect all the refrigerant tubes.
Connecting Procedures of Refrigerant Tubing
• Dual wrenches must be used in the connection of indoor unit tubing.
• Mounting torque refers to the right table
Outer Diameter of
Tubing in (mm)
Mounting Torque
lb-in (N-m)
Flare Torque Spec
ft-lb (N-m)
Ø1/4"(Ø6.35) 104.4 (11.8) 13 (18)
Ø3/8"(Ø9.52) 216.8 (24.5) 30 (40)
Ø1/2"(Ø12.7) 443.7 (49.0) 43 (59)
Ø5/8"(Ø15.88) 693.9 (78.4) 76 (103)
refrigerant oil
joint nut
wrench wrench
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.
Cutting and Enlarging
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.
Connecting
Vacuumize from the stop valve of outdoor units with
vacuum pump. Refrigerant sealed in indoor machine is
not allowed to use for vacuumization.
Vacuumizing
Open all the valves of outdoor units. [NB: oil balancing
stop valve must be shut up completely when connected
one main unit.]
Open All Valves
Check if there is any leakage at the connecting part
and bonnet with hydrophone or soapsuds.
Checkup for Air Leakage
Connecting
circular
terminals:
correct
pressing
wrong
pressing
terminal tier
pressing clip
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.
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