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49
ENGLISH
Classification
Example
Remarks
Maximum
allowable
height
difference
Outdoor unit ~
Indoor unit
Pipe length
110 m / 110 m
(361'/361')
Note 1)
H1 ≤ 110 m / 110 m (361'/361')
Indoor unit ~
Indoor unit
40 m(131')
or less
H2 ≤ 40 m(131')
But, when AM
✴✴✴
HNQDC
✴
is installed, H2 is 15 m(49') or less.
Indoor unit ~
Indoor unit
(in one MCU)
15 m(49')
or less
H3 ≤ 15 m(49')
MCU ~ MCU
30 m(98')
or less
H4 ≤ 30 m(98')
Maximum
allowable
length after
branch
joint
First branch
joint ~ Farthest
Indoor unit
Pipe length
45 m(148')
or less
Installing only with
MCU
g+j ≤ 45 m(148')
45 ~ 90 m
(148'~295')
Note 2)
Installing with MCU
and Y-joint
b+h+k ≤ 45 m(148')
l+p ≤ 45 m(148')
Required conditions must be satisfied
Distribution kit
Model
Remarks
From distribution kit to
indoor unit
Actual pipe length
2 m(6.6')
or less
MEV-24SA
(For 1 indoor unit)
Applied to products without EEV
(wall-mounted)
Note 1) When indoor unit is located at higher level than outdoor unit, allowable height difference is 110 m(361'), (If the height difference is
over 40 m(131'), contact your local dealer for more information.) but when the indoor unit is located at lower level than outdoor unit,
allowable height difference is 110 m(361') (If the height difference is over 50m(164'), 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
45 m ≤ b+h+k, l+m+q, l+r ≤ 90 m(295') : Size of the branch
liquid and low pressure gas pipes (b, l, m) must be
increased by 1 grade.
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 2+c+d+e+f+g+h+i+j+k+n+o+p+q+r ≤
1000 m(3281')
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 2+c+d+e+f+g+h+i+j+k+n+o+p+q+r ≤
1000 m(3281')
MCU ~ Each
indoor unit
c+d, c+e, c+f, g, h+i, h+j, h+k, n, o, p, q, r ≤ 45 m(148')
Difference between the distance of the outdoor unit to the farthest indoor
unit and nearest indoor unit ≤ 45 (a+b+h+k) - (a+b+c+d) ≤ 45 m(148')
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 cannot be combined. ERV plus (AM
✴✴✴✴
NK
✴
C
✴✴
),
OAP duct (AM
✴✴✴✴
NE
✴
C
✴
), Hydro Unit HE (AM
✴✴✴✴
NBDC
✴
), Hydro Unit HT (AM
✴✴✴✴
NBFC
✴
), AHU kit (MXD-K
✴✴✴
AN, MCM-
D
✴✴✴
N)
Note 5) In case of connecting two MCU ports with Y-joint, the indoor units cannot be combined to more than one.
❋
Total refrigerant amount of the system must be less than 100 kg(220 lb). If total refrigerant amount of system is over than 100 kg(220 lb), the system
has to be divided into smaller system, each less than 100 kg(220 lb).
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