Grouped Operation Of Units In Separate Refrigerant Circuits - Mitsubishi Electric HP120TNU-A Service Handbook

[2-7 Example System with an MA Remote Controller ]
2-7-3

Grouped Operation of Units in Separate Refrigerant Circuits

(1) Sample control wiring
L11
Leave the male
connector on
CN41 as it is.
SW5-1 OFF
OS
52
TB3
M1 M2
TB7
M1 M2 S
To be left
unconnected
L21
Leave the male
connector on
CN41 as it is.
SW5-1 OFF
OS
56
TB3
M1 M2
TB7
M1 M2 S
To be left
unconnected
(2) Cautions
1) ME remote controller and MA remote controller cannot both
be connected to the same group of indoor units.
2) No more than 2 MA remote controllers can be connected to
a group of indoor units.
3) Do not connect the terminal blocks (TB5) on the indoor units
that are connected to different outdoor units with each other.
4) Replacement of male power jumper connector (CN41) must
be performed only on one of the outdoor units.
5) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only one of
the outdoor units.
6) When the number of the connected indoor units is as shown
in the table below, one or more transmission boosters (sold
separately) are required.
To connect two transmission boosters, connect them in par-
allel. (Observe the maximum number of connectable indoor
units that are listed in the specifications for each outdoor
unit.)
When the P72 and P96 models are
not included in the connected indoor
units
When the P72 and P96 models are in-
cluded in the connected indoor units
The table above shows the number of transmission
HWE18220_GB
Move the male connector
from CN41 to CN40.
Group
SW5-1 OFF
OC BC
51 53
TB5
TB3 TB02
M1 M2
M1 M2 M1 M2 S
TB7
M1 M2 S
To be connected
Leave the male
connector on
CN41 as it is.
SW5-1 OFF
OC BC
55 57
TB5
TB3 TB02
M1 M2
M1 M2 M1 M2 S
TB7
M1 M2 S
To be left
unconnected
Number of transmission boost-
er (sold separately) required
1 unit 2 units
27 - 50 units -
21 - 39 units 40 - 50 units
L12
Group
IC IC
01 03
TB15 TB5 TB15
S M1 M2 S
1 2 1 2
A1 B2 A1 B2
MA MA
L22
Group
IC IC
02 04
TB5 TB15
TB15
S
1 2 M1 M2 S 1 2
A1 B2
MA
boosters that is required by the system with three BC
controllers. For each BC controller added or subtracted,
subtract or add two indoor units.
Refer to the DATABOOK for further information about
how many booster units are required for a given system.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm
L11+L12 200m [656ft]
L21+L22 200m [656ft]
2) Transmission line for centralized control
L31+L21 200m [656ft]
3) MA remote controller wiring
Same as 2-7-1
4) Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L12(L11)+L31+L22(L21) 1000 m [3280ft] (500 m
*1
[1640ft])
*1 If a given system includes one or more unit or remote
controller that does not support the maximum allow-
able cable distance of 1000 m [3280 ft], the maximum
allowable cable distance in the system will be 500 m
[1640 ft]. Refer to the latest catalog for information on
which units and remote controllers support the maxi-
mum allowable cable distance of 1000 m [3280 ft].
Interlock operation with
the ventilation unit
Group
LC
IC
06 07
TB5 TB15 TB5
M1 M2 S
M1 M2 S 1 2
A1 B2
MA
IC
05
TB5 TB15
M1 M2 S
1 2
m5
2
[AWG16] or larger)
chapter 2 -
17