Mitsubishi Electric PQHY-P120THMU-A, Service Handbook

Page: 58 / 414

[
II
Restrictions ]
49 - 49 - HWE09080 GB
[6] An Example of a System to which an ME Remote Controller is connected
1. A system in which a system controller is connected to the centralized control transmission line <PQHY>
(1) Sample control wiring
(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 3 ME 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) Replace the power jumper connector of the control board
from CN41 to CN40 on only one of the heat source units.
5) Provide an electrical path to ground for the S terminal on
the terminal block for centralized control on only one of
the heat source units.
6) A transmission booster must be connected to a system
in which the total number of connected indoor units ex-
ceeds 20.
7) A transmission booster is required in a system to which
more than 16 indoor including one or more indoor units
of the 72 model or above are connected.
8) When a power supply unit is connected to the transmis-
sion line for centralized control, leave the power jumper
connector on CN41 as it is (factory setting).
(3) Maximum allowable length
1) Indoor-heat source transmission line
Same as [5] 3.
2) Transmission line for centralized control
Same as [5] 4.
3) ME remote controller wiring
Maximum overall line length
(0.3 to 1.25mm
2
[AWG22 to 16])
m1 10m [32ft]
m2+m3 10m [32ft]
If the standard-supplied cable must be extended, use a
cable with a diameter of 1.25mm
2
[AWG16]. The section
of the cable that exceeds 10m [32ft] must be included in
the maximum indoor-heat source transmission line dis-
tance described in 1).
When connected to the terminal block on the Simple re-
mote controller, use cables that meet the following cable
size specifications: 0.75 - 1.25 mm
2
[AWG18-14].
4) Maximum line distance via heat source unit
(1.25mm
2
or larger)
Same as [5] 4.
IC
TB5
S
TB15
1 2
01
IC
TB5
S
TB15
1 2
02
LC
TB5
S
07
IC
TB5
S 1 2
TB15
IC
TB5
S
TB15
1 2
05 04
LC
TB5
S
08
IC
TB5
S
TB15
1 2
03
IC
TB5
S
TB15
1 2
06
A B
RC
101
A B
RC
102
A B
RC
103
Group
Group
Group Group Group
M1 M2 M1 M2 M1 M2 M1 M2
M1 M2 M1 M2 M1 M2 M1 M2
L12 L11
L22 L21
L31
A B S
L32
Note1
System controller
Interlock operation with
the ventilation unit
OC
TB3
TB7
S
51
m1
OS1
TB3
TB7
S
52
OS2
TB3
TB7
M1 M2 M1 M2 M1 M2
M1 M2 M1 M2 M1 M2 S
53
OC
TB3
TB7
S
54
OS1
TB3
TB7
S
55
OS2
TB3
TB7
M1 M2 M1 M2 M1 M2
M1 M2 M1 M2 M1 M2 S
56
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
SW2-1 OFF ON
Move the male connector
from CN41 to CN40.
To be connected
To be left
unconnected
To be left
unconnected
To be left
unconnected
To be left
unconnected
To be left
unconnected
104
A B
RC
154
A B
RC
m3
106
A B
RC
m2
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.