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5-2. Connecting Tubing Between Indoor and Outdoor
Units
(1) Preparing the Joint Tube (10 HP only).
● The tubing of the gas main has a diameter of ø22.22, but
the connection to the service valve of the outdoor unit has a
diameter of ø19.05, so a flare has to be used.
Consequently, be sure to use the enclosed joint tube B and
joint tube A in making connections (braze).
● Align the joint tube in the direction the tubing comes out and
see the following references "Examples of Making Tube
Connections" 1 to 4 in cutting it to the required length and
then braze it.
● For the connection to the service valve on the outdoor unit,
use the supplied joint tube B.
Thereby, perform flaring process in a ø19.05 on the joint
tube end B (connecting side to the service valve).
● Cut out the supplied joint tube A according to the required
length by referring to the following connection tubing
samples 1 to 4.
● Perform brazing the supplied joint tube A with the supplied
joint tube B in the appropriate direction.
● To protect the wiring and parts inside the unit, perform
the brazing outside the unit. (Also, take note that each of
the joint tubes in 1 to 3 have to be installed in a specific
direction, so make sure they are as depicted in the figure
when you braze them.)
● Make a flare connection of the supplied joint tubes A and B
to the gas side service valve on the outdoor unit.
Examples of Making Tube Connections
1. Out Front
Flare process
Cutout
Joint tube A
Joint tube B
2. Out Right
Flare process
Cutout
Joint tube A
Joint tube B
3. Out Rear
Flare process
Joint tube B
Cutout
Joint tube A
4. Out Bottom
Flare process
Joint tube B
Joint tube A
Cutout
35
Front view
Right side view
Right side view
Right side view
Right side view
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