30
Multi Air Conditioner
Flaring Work and Connection of Piping
Align the center of the piping and sufficiently
tighten the flare nut by hand.
Connecting pipe order
1) ROOM A~C gas side pipe
2) ROOM A~C liquid side pipe
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.
Ø 12.7(1/2 inch)
Connector
Outdoor unit
Liquid
side piping
Main Liquid
side valve
Main gas
side valve
ROOM A
ROOM B
ROOM C
Gas side
piping
Connection of piping - Outdoor
Outside diameter
Torque
mm
inch
N.m
kgf.m
lbf.ft
Ø 6.35
1/4
14~18
1.4~1.8
10~13
Ø 9.52
3/8
34~42
3.5~4.3
25~31
Ø 12.7
1/2
49~61
5.0~6.2
36~45
Ø 15.88
5/8
69~82
7.0~8.4
51~60
Ø 19.05
3/4
100~120 10.0~12.2
73~88
Outdoor unit (36,42 kBtu/h class)
(only indoor units
18,24 kBtu/h class)
(only indoor units
36 kBtu/h class- connect “D ROOM”)
(BD Unit : PMBD3641)
(BD Unit : PMBD3640)
A R
OO
M
B ROO
M
C
ROOM
D R
OOM
A R
OO
M
B RO
OM
C ROOM
D ROO
M
BD Unit
Refrigerant Connections Pipe
Size (inch (mm))
Connectable
Indoor Unit
Capacity (kBtu/h
class)
Liquid
Gas
PMBD3620
1/4 (Ø 6.35)
x 2 EA
3/8 (Ø 9.52) x 2
EA
7,9,12,15,18,24 k
PMBD3630
1/4 (Ø 6.35)
x 3 EA
3/8 (Ø 9.52) x 3
EA
7,9,12,15,18,24 k
PMBD3640
1/4 (Ø 6.35)
x 4 EA
3/8 (Ø 9.52) x 4
EA
7,9,12,15,18,24 k
PMBD3641
1/4 (Ø 6.35)
x 4 EA
3/8 (Ø 9.52)
x 3 EA
7,9,12,15,18,24 k
(A,B,C ROOM)
1/2 (Ø 12.7)
x 1 EA
24,36 k
(D ROOM)
h
BD Unit(PMBD3641) includes the socket.
(Ø 12.7
→
Ø 15.88 x 1 EA, Ø 6.35
→
Ø 9.52 x 1 EA)
