Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 54

[ II Restrictions ]
10. An example of a system in which a system controller is connected to the indoor-heat source transmission line (ex-
cept LM adapter) <PQRY>
(1) Sample control wiring
L11
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
OS
52
TB3
M1 M2
TB7
M1 M2
S
To be left
unconnected
L21
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
SW2-1 OFF ON SW2-1 OFF ON
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 con-
nected 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 heat source units with each other.
4) Replacement of male power jumper connector (CN41) must be per-
formed only on one of the heat source units.
5) Provide grounding to S terminal on the terminal block for transmis-
sion line for centralized control (TB7) on only one of the heat source
units.
6) A maximum of 3 system controllers can be connected to the indoor-
heat source transmission line, with the exception that only one G(B)-
50A may be connected.
7) When the total number of indoor units exceeds 20 (12 if one or more
indoor units of the 72 model or above is connected), it may not be
possible to connect a system controller to the indoor-heat source
transmission line.
8) 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 parallel.
(Observe the maximum number of connectable indoor units that are
listed in the specifications for each heat source unit.)
HWE09080
Move the male connector .
from CN41 to CN40.
SW2-1 OFF ON
Group
OC BC
51 53
TB3 TB02
TB5
M1 M2
M1 M2 S M1
TB7
M1 M2 S
To be connected
Group
OC BC
55 57
TB3 TB02
TB5
M1 M2 M1 M2 S
M1 M2
TB7
M1 M2 S
To be left Note1
unconnected
System controller
A B S
Interlock operation with
the ventilation unit
L12
Group
IC IC
01 02
TB15 TB5 TB15
M2 M1 M2
S 1 2 S 1 2
A B A B
1 2 1 2
MA MA
L22
Group
IC IC
04 05
TB5 TB15
TB15
S 1 2 M1 M2 S 1 2
A B
1 2
MA
m3
Note1 LM adapters cannot be connected to the
indoor-heat source transmission line.
When the P72 and P96 models are not in-
cluded in the connected indoor units
When the P72 or P96 model is included in
the connected indoor units
ŒThe table above shows the number of transmission boosters that is
required by the system with three BC controllers. For each BC con-
troller that is subtracted from the above-mentioned system, two ad-
ditional indoor units can be connected.
(3) Maximum allowable length
1) Indoor-heat source transmission line
Maximum distance (1.25mm
L11+L12 200m [656ft]
L21+L22 200m [656ft]
L25 200m [656ft]
2) Transmission line for centralized control
L31+L21 200m [656ft]
3) MA remote controller wiring
Same as [5] 6.
4) Maximum line distance via heat source unit
2
(1.25mm [AWG16] or larger)
L25+L31+L12(L11) 500m [1640ft]
L12(L11)+L31+L22(L21) 500m [1640ft]
- 45 - 45
Group
LC
IC
03 07
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
1 2
MA
LC
IC
08
06
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
1 2
MA
Number of transmission
booster (sold separately)
required
1 unit 2 units
27 - 50
units
21 - 39 40 - 50
units units
2
[AWG16] or larger)
-
GB