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10
Please refer to the attached manual of outdoor units.
Special tools for R410A should be used for cutting and enlarging pipes.
Model MVAD007~018MV2AA MVAD024MV2AA
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
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.
Installation Procedures
Pipe Length & Height Difference
Tubing Materials & Specications
Refrigerant Recharge Amount
1. Connecting using circular crimp terminals:
The method of using circular terminal is shown in the gure. Take off the screw, connect it to the
terminal after placing it through the ring at the end of the lead and tighten it down.
2. Connecting using straight terminals:
The method of using straight terminals is shown as follows: loosen the screw before putting the wire into the terminal
block, tighten the screw and conrm it has been tightened by pulling the line gently.
3. Clamp the wires:
Secure the wires with clips which should press on the insulation of the wires.
Wire Connections
Connecting
circular
terminals:
correct
pressing
wrong
pressing
terminal tier
pressing clip
Connecting Procedures of Refrigerant Tubing
Connect all the refrigerant tubes via are connections.
• Dual wrenches must be used in the connection of indoor unit tubing.
• For tightening torque refer 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)
wrench
Cutting and Enlarging
• Cut the tube to the needed length.
• Ream the cut to remove shoulder. Do this with the tube facing down to help llings fall out.
• Add supplied are nut to tube.
• Use 45° are tool to create are.
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