Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 52

[ II Restrictions ]
9. A system in which a system controller is connected to the transmission line for centralized control and which is pow-
ered from a heat source unit <PQRY>
(1) Sample control wiring
L11
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS
52
TB3
M1M2
TB7
M1M2
S
To be left
unconnected
L21
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS
56
TB3
M1M2
TB7
M1M2
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) Short-circuit the shield terminal (S terminal) and the earth terminal (
) on the terminal block for transmission line for centralized control
(TB7) on the heat source unit whose power jumper connector is mat-
ed with CN40.
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 parallel.
(Observe the maximum number of connectable indoor units that are
listed in the specifications for each heat source unit.)
When the P72 and P96 models are
not included in the connected in-
door units
When the P72 or P96 model is in-
cluded in the connected indoor
units
HWE09080
Move the male connector
from CN41 to CN40.
SW2-1 OFF
Group
OC BC
51 53
TB3 TB02 TB5
M1M2 M1M2 S M1M2
TB7
M1M2
S
To be connected
Leave the male
connector on
CN41 as it is.
Group
SW2-1 OFF
OC BC
55 57
TB3 TB02
TB5
M1M2
M1M2 S
M1M2
TB7
To be left
M1M2
S
unconnected
Note1
System controller
A B S
Number of transmission booster
(sold separately) required
1 unit 2 units
27 - 50 units -
21 - 39 units 40 - 50 units
Interlock operation with
the ventilation unit
L12
Group
IC IC
01 02
TB15 TB5 TB15
S 1 2 M1M2 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 M1M2 S 1 2
A B
1 2
MA
m3
Note1 When only the LM adapter is connected,
leave SW2-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 208 - 230V.
ŒThe left table shows the number of transmission boosters
that is required by the system with three BC controllers. For
each BC controller that is subtracted from the above-men-
tioned system, two additional indoor units can be connected.
7) When a power supply unit is connected to the transmission
line for centralized control, leave the power jumper connec-
tor on CN41 as it is (factory setting).
(3) Maximum allowable length
1) Indoor-heat source transmission line
Same as [5] 8.
2) Transmission line for centralized control
Maximum line distance via heat source unit (1.25 mm
[AWG16] min.)
L31+L32(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)
L32+L31+L12(L11)
L32+L22(L21) 500m [1640ft]
L12(L11)+L31+L22(L21)
- 43 - 43
Group
LC
IC
03 07
TB5 TB15 TB5
M1M2 S 1 2 M1M2 S
A B
1 2
MA
LC
IC
08
06
TB5 TB15 TB5
M1M2 S 1 2 M1M2 S
A B
1 2
MA
500m [1640ft]
500m[1640ft]
2
GB