10. Installation
Outdoor unit
Classification
Condition
Example
First branch joint ~
Farthest Indoor unit
45m ≤ b+c+d+e+f+g+p ≤ 90m: branch pipes (b, c, d, e, f, g) size must
be increased by 1 grade
b
h
i
j
k
l
m
n
H2
1
2
3
4
5
6
7
8
aA
B
C
D
E
F
G
H1
c
d
e
f
g
p
Total length of
extended pipe
If the size of pipe (main pipe), between the first branch joint and
the outdoor unit, is not increased by 1 grade, a+(b+c+d+e+f+g)×2
+h+i+j+k+l+m+n+p ≤ 1000 m
If the size of pipe (main pipe), between the first branch joint and
the outdoor unit, is increased by 1 grade, (a+b+c+d+e+f+g)×2
+h+i+j+k+l+m+n+p ≤ 1000 m
Each Y-joint ~
Each indoor unit
h, i, j, … p ≤ 45 m
Difference between the distance of the outdoor unit to the farthest indoor unit and nearest
indoor unit ≤ 45m, (a+b+c+d+e+f+g+p)-(a+h) ≤ 45m
Note 2) When indoor unit is located at higher level than outdoor unit, allowable height difference is 110m, (If the height difference is over
40m, contact your local dealer for more information.)
but when the indoor unit is located at lower level than outdoor unit, allowable height difference is 110m (If the height difference is
over 50m, need to decide whether to install PDM kit or not.)
Model name of the PDM kit : MXD-A38K2A, MXD-A12K2A, MXD-A58K2A
How to connect the pipes
Pipe connection to indoor unit
Gas pipe (welding)
Liquid pipe (welding)
Protect with wet towel
when welding
70 mm
Pipe connection from outdoor unit
← Default installing direction.
Low pressure gas pipe connection
(welding)
High pressure gas pipe connection
(welding)
Liquid pipe connection (welding)
70 mm
※
When installing MCU, use the pattern sheet for installation that is provided with the product.
※
When welding the gas pipes, protect the product with the flame-proof sheet.
※
When connecting the MCU with outdoor units, default direction is set in the MCU.
If installing opposite direction, weld the enclosed copper cap in each high pressure, low pressure and liquid pipes.
