91
MINI 4-way cassette
type indoor unit
Connecting Procedures of Refrigerant Tubing
Proceed the are 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)
wrench
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
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.
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 are
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.
Connecting
circular
terminals:
correct
pressing
wrong
pressing
terminal tier
pressing clip
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