Mitsubishi Electric MXZ-8B140VA Technical & Service Manual page 20

■ Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit
Indoor unit type
(kW)
Liquid
Pipe size (mm)
Gas
When using 60 type indoor unit of MEXZ series, use the flare nut in the indoor unit accessory for the gas side connecting of
indoor unit.
Do not use the flare nut (gas side) attached to the indoor unit. If it is used, a gas leakage or even a pipe extraction may occur.
■ Pipe size (Branch box-Indoor unit) *Case of P series Indoor unit
Indoor unit type (kW)
Liquid
Pipe size
(mm) Gas
When using 35, 50 type indoor unit of P series, use the flare nut (for R410A) attached to the indoor unit.
Do not use the flare nut (for R407C) in the indoor unit accessory. If it is used, a gas leakage or even a pipe extraction may occur.
w For the connection of P100 indoor unit(s), use the refrigerant pipes specified in the table below.
Branch box
a
Port A
a
Port B
Port C
Port D
Port E
(1) Valve size for outdoor unit
For liquid
For gas
(2) Valve size for branch unit
Liquid pipe
UNIT
Gas pipe
Liquid pipe
UNIT
Gas pipe
Liquid pipe
UNIT
Gas pipe
Liquid pipe
UNIT
Gas pipe
Liquid pipe
UNIT
Gas pipe
3- branch type is only for
Different-diameter joint (optional parts) (Fig.7-1)
Connected pipes diameter
Model name
mm
9.52
MAC-A454JP
12.7
MAC-A455JP
12.7
MAC-A456JP
6.35
PAC-493PI
9.52
PAC-SG76RJ-E
Y-shape connection pipe for 100 type indoor unit (optional parts)
(Fig.7-2)
Model name
Liquid
PAC-AK52YP-E
Gas
OCH480A
20 22
15
6.35 6.35 6.35
9.52 9.52 9.52
35 50
6.35 6.35
12.7 12.7
Y-shape connection pipe
Indoor unit
b
(P100)
<Length limit>
1[m]≤a
a+b≤15[m]
, , and unit.
Diameter A Diameter B
mm
12.7 9.52
9.52 12.7
15.88 12.7
9.52 6.35
15.88 9.52
Connected pipe diameter Diameter A Diameter B
mm
ø6.35 → ø9.52
ø9.52 → ø15.88
25 35
42
6.35 6.35 6.35
9.52 9.52 9.52
60 71 100
9.52 9.52 9.52
15.88 15.88 15.88
Distance between
branch box and
Y-shape connection
pipe (=a)
1 to 10 [m]
10 [m] or more
1 To connect a 12.7 gas pipe, use a joint pipe (MAC-A454JP)
9.52 mm
15.88 mm
6.35 mm
9.52 mm
6.35 mm
9.52 mm
6.35 mm
9.52 mm
6.35 mm
9.52 mm
6.35 mm
12.7 mm
mm
12.7
9.52
A
15.88
Fig.7-1
9.52
15.88
mm mm
ø6.35 ø9.52
ø9.52 ø15.88
20
50 60
6.35 6.35
12.7 15.88
Liquid Gas
a b a
6.35 9.52 9.52
6.35 9.52 12.7 1
Conversion formula
1/4 inch 6.35mm
3/8 inch
9.52mm
1/2 inch 12.7mm
B
5/8 inch 15.88mm
3/4 inch
19.05mm
A
B
Fig.7-2
71 80
9.52 9.52
15.88 15.88
b
15.88
15.88