Securing Installation And Service Space; Checking The Installation Site - Mitsubishi Electric CMB-P-NU-J1 Installation Manual

3.3. Securing installation and service
space
1. For hanging from the ceiling
(This is a reference view showing the least installation space.)
[Fig. 3.3.1]
<Top view>
A
450 (17-23/32)
C
B
D
INDOOR UNIT SIDE
D A
<Front view>
B
A Inspection hole
C Control box
*1 Dimensions with which pipe connection can be handled at site
Model name A
CMB-P104NU-J1
596
CMB-P106NU-J1
[23-15/32]
CMB-P108NU-J1
911
CMB-P1012NU-J1
[35-7/8]
1135
CMB-P1016NU-J1
[44-11/16]
911
CMB-P108NU-JA1
[35-7/8]
CMB-P1012NU-JA1
[9-27/32]
1135
CMB-P1016NU-JA1
[44-11/16]
CMB-P1016NU-KA1
CMB-P104NU-KB1 596
[23-15/32]
CMB-P108NU-KB1

3.4. Checking the installation site

Check that the difference of elevation between indoor and outdoor units and the
length of refrigerant piping are within the following limitations.
1. CMB-P104, 106, 108, 1012, 1016NU-J1 (In the case the outdoor unit
is 12.5-hp (P120 model) or below, and 16 or fewer ports are used.)
CMB-P108, 1012, 1016NU-JA1, CMB-P1016NU-KA1 (When no Sub BC
controller is connected)
[Fig. 3.4.1]
Unit 1
Ⓐ
A
A
Ⓕ
a
a
Ⓓ
(Unit: mm [in])
E B
B On the side of outdoor unit piping
D On the side of indoor unit piping
B C D E
398 73
[9-11/16] [2-7/8]
250
-
231
[9-27/32]
[9-1/8]
343
[13-9/16]
545
231
[21-15/32]
[9-1/8]
250 300
[11-13/16]
343
[13-9/16]
398 250 73
-
[9-11/16] [9-27/32] [2-7/8]
Ⓑ
Ⓓ
b
b
d
d
Ⓖ
B
B
c
c
Ⓔ
Ⓓ
Ⓗ
A Outdoor unit (Heat source unit)
C BC controller (Sub)
E Indoor unit (Total capacity of downstream indoor unit: 72 to 96)
F Twinning pipe (Model name: CMY-R160-J1)
G 2-Branch Joint Pipe
H Up to three units for 1 branch hole
Total capacity: 30 or below. (but same in cooling/heating mode)
Item
Total piping length
Longest piping length
Between outdoor (heat source) unit
and BC controller
Between indoor units and BC controller
Above outdoor
Between indoor
(heat source) unit
and outdoor
(heat source)
Below outdoor
units
(heat source) unit
Between indoor units and BC controller "h1"
Between indoor units
Notes:
*1 Refer to "Restrictions on piping length" on P. 8.
*2 Refer to the graph "Distance between main BC controller and farthest
indoor unit (direct connection)". (However, when P72 or P96 model of
indoor unit is connected, the maximum allowable distance between
BC controller and farthest indoor unit is 40 m [131 ft].)
*3 The values in the parentheses show the maximum piping length to
be followed when the connection capacity of the indoor unit is 72 or
more.
*4 In the system to which indoor units of the P72 model or above are
connected, neither a branch joint nor a branch header may be used.
*5 Do not connect the P72 or P96 models of indoor units and other
models of indoor units at the same port.
*6 Indoor units that are connected to the same branch joint cannot be
simultaneously operated in different operation modes.
*7 When connecting multiple indoor units to one branch port, those
indoor units must be installed in the same room.
*8 For connecting 6 to 18 model indoor units
Have pipe expansion of indoor unit connecting port by cutting the piping at
the cutting point which depends on the indoor unit capacity.
Distance between main BC controller and farthest indoor unit (direct connection)
70 [229]
60 [196]
50 [164]
40 [131]
30 [98]
20 [65]
10 [32]
0
0 5 [16]
Height difference between BC controller and farthest indoor
unit (m [ft])
B BC controller (Main)
D Indoor unit
(Unit: m [ft])
Piping portion Allowable value
Not to exceed
"A+B+a+b the maximum
+c+d" refrigerant piping
length *1
165 [541] or less
"A+B+c" (Equivalent length
of 190 [623] or less)
"A" 110 [360] or less
"a" or "b" or
60 [196] or less *2
"B+c" or "B+d"
"H" 50 [164] or less
"H1" 40 [131]or less
15 [49] or less
(10 [32] or less *3)
30 [98] or less
"h2"
(20 [65] or less *3)
10 [32] 15 [49]
5