Installation guide

ENGLISH
Installation of Indoor
Installation Manual 15
Piping Connection
1. Form the piping according to its routing.
Avoid bending and bending back the same
piping point more than three times. (This will
result in hardening the pipe.)
2. After deforming the piping, align centers of the
union fitting of the indoor unit and the piping,
and tighten them firmly with wrenches.
3. Connect pipe to the service valve or ball
valve which is located below the outdoor unit.
4. After completing the piping connection, be
sure to check if there is gas leakage in indoor
and outdoor connection.
Vacuum drying
After completing the piping connection, execute vacuum
drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out using the
service ports of both the liquid and gas side valves.
Connection of the pipes
1. When piping installation work you must be
used the connector.
Connecting pipe size
Outdoor
unit
Liquid side
Flare connection
Flare connection
Gas side
Indoor
unit
A
B
Gas side Liquid side
ABA B
24k Ø15.88 Ø12.7 Ø9.52 Ø6.35
30k, 36k - - Ø9.52 Ø6.35
Indoor Units
Indoor Units Gas side Liquid side
7k, 9k, 12k Ø9.52 Ø6.35
18k, 24k Ø12.7 Ø6.35
30k, 36k Ø15.88 Ø6.35
Flare nut fastening torque
mm inch kgf
.
m
Ø6.35 1/4 1.8~2.5
Ø9.52 3/8 3.4~4.2
Ø12.7 1/2 5.5~6.6
Ø15.88 5/8 6.3~8.2
Ø19.05 3/4 9.9~12.1
2. Align the center of the pipings and sufficiently tighten the flare nut by hand
3. Finally, tighten the flare nut with torque wrench until the wrench clicks.
■ When tightening the flare nut with torque wrench, ensure the direction for tightening follows the
arrow on the wrench.
CAUTION: Use two wrenches and tighten with regular torque.