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10. Installation
Refrigerant pipe installation
Note 1) 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
Note 2) Required condition
Classification Condition Example
First branch joint ~
Farthest Indoor unit
branch liquid and low pressure gas pipes (b,
l, m) must be increased by 1 grade.
MCU
MCU
MCU
o
h
n
H4
H1
H2
H3
p q
r
l
m
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+l+m) x
If the size of pipe (main pipe), between
the first branch joint and the outdoor
unit, is increased by 1 grade, (a+b+l+m) x
MCU ~
Each indoor unit
Difference between the distance of the outdoor unit to the farthest
Note 3) For indoor units to which no MCU is connected, be sure to set their options to “Cooling only indoor unit,” and then
connect them to a low pressure gas pipe and a liquid pipe. Be sure to combine the cooling only indoor units so
that their total capacity becomes 50% or less of the total capacity of all indoor units.
Note 4) In case of connecting more than one indoor unit in one MCU Port, the below indoor units can not be combined.
Note 5) In case of connecting two MCU ports with Y-joint, the indoor units can not be combined to more than one.
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