Checking The Installation Site - Mitsubishi Electric CITY MULTI CMB-P-V-J Manuel D'installation

2.4. 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, 1016V-J (In the case the outdoor unit is 14-hp (P350 model) or below, and 16 or fewer ports are used.)
CMB-P108, 1012, 1016V-JA, CMB-P1016V-KA (When no Sub BC controller is connected)
Unit 1
Ⓐ
A
A
a
Ⓓ
Item
Total piping length
Longest piping length
Between outdoor (heat source)
unit and BC controller
Between indoor units and BC
controller
Above outdoor
Between
(heat source) unit
indoor and
outdoor (heat
Below outdoor
source) units
(heat source) unit
Between indoor units and BC
controller
Between indoor units
10
Ⓑ
Ⓕ
Ⓓ
b
a
b
d
d
Ⓖ
B
B
c
c
Ⓔ
Ⓓ
(Unit: m)
Piping portion Allowable value
Not to exceed the
"A+B+a+b
maximum refrigerant
+c+d"
piping length *1
165 or less
"A+B+c" (Equivalent length of
190 or less)
"A" 110 or less
"a" or "b" or
60 or less *2
"B+c" or "B+d"
"H" 50 or less
"H1" 40 or less
15 or less
"h1"
(10 or less *3)
30 or less
"h2"
(20 or less *3)
Ⓐ Outdoor unit (Heat source unit)
Ⓑ BC controller (Main)
Ⓒ BC controller (Sub)
Ⓓ Indoor unit (Total capacity of downstream indoor unit: 15 to 80)
Ⓔ Indoor unit (Total capacity of downstream indoor unit: 100 to 250)
Ⓕ Twinning pipe (Model name: CMY-R160-J1)
Ⓖ 2-Branch Joint Pipe
Notes:
*1 Refer to "Restrictions on piping length" on P. 3.
*2 Refer to the graph "Distance between main BC controller and farthest
indoor unit (direct connection)". (However, when P200 or P250 model of
indoor unit is connected, the maximum allowable distance between BC
controller and farthest indoor unit is 40 m.)
*3 The values in the parentheses show the maximum piping length to be
followed when the connection capacity of the indoor unit is 200 or above.
*4 In the system to which indoor units of the P200 model or above are
connected, neither a branch joint nor a branch header may be used.
*5 Do not connect the P200 or P250 models of indoor units and other
models of indoor units at the same port.
*6 In the system to which indoor units of the P100 through P140 models
are connected, merge the two ports before connecting them. (Set DIP
SW4-6 on the BC controller to ON.)
*7 It is possible to connect the P100 through P140 models of indoor units to
a single port. (Set DIP SW4-6 to OFF.) Note that the cooling capacity will
somewhat decrease. (The factory setting for DIP SW4-6 is OFF.)
When connecting only PEFY-P50/63/71/80VMHS2-E units, set the
dipswitches SW4-1 and SW4-6 on the BC controller to ON.
*8 Indoor units that are connected to the same branch joint cannot be
simultaneously operated in different operation modes.
*9 When connecting PEFY-P50/63/71/80VMHS2-E units to two ports, use a
Joint Pipe Kit CMY-R160-J1.
Distance between main BC controller
and farthest indoor unit (direct connection)
70
60
50
40
30
20
10
0
0 5 10
Height difference between
BC controller and farthest indoor unit (m)
*10 For connecting 15 to 50 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.
15