Service Manual 91
Installation
• When connecting indoor units, make sure to connect refrigerant pipes and connection wires to the appropriate con-
nection ports maked with matching alphabets. (A, B, C, D)
:
• Be sure to mark all the local refrigerant piping(liquid
pipes, gas pipes, etc.) for each indoor unit designating
clearly which room it belongs in.(A, B, C, D)
:
For flaring work the piping, follow the instructions in the installation manual to each unit.
Connecting the pipings to the indoor unit
and drain hose to drain pipe
1. Align the center of the pipings and sufficiently tighten
the flare nut by hand.
2. Tighten the flare nut with a wrench.
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe insulation material and
the indoor unit pipe insulation material. Bind them
together with vinyl tape so that there is no gap.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
Close up a socket for unoccupied room
with a brass cap.
1. Align the center of the piping and sufficiently tighten
the brass cap by hand.
2. Tighten the brass cap with a wrench.
3. Wrap the joint part with insulation.
BD Unit Socket Flare nut Pipes
Wrench
BD Unit Socket
Open-end wrench (fixed)
Connection pipe
Flare nut
mm inch kg
.
m
Ø6.35 1/4 1.8
Ø9.52 3/8 4.2
Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6
Outside diameter Torque
Vinyl tape(narrow)
BD Unit
Connecting cable
Vinyl tape (wide)
Wrap with vinyl tape
Indoor unit pipe
Pipe
BD Unit Socket Pipe sealed
or welded
Brass cap
ABCD
CAUTIONS
• Never use the plastic cap for sealing.
• Make sure to use brass cap with the end of
pipe sealed or welded tightly.
Connection of Piping
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