Group Operation Of Units In A System With Multiple Heat Source Units - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ II Restrictions ]
3. Group operation of units in a system with multiple heat source units <PQHY>
(1) Sample control wiring
L11
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
SW2-1 OFF SW2-1 OFF
OS2
53
TB3
M1 M2 M1 M2
TB7
M1 M2 S M1 M2
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 SW2-1 OFF
OS2
56
TB3 TB3
M1 M2 M1 M2
TB7 TB7
M1 M2 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 heat source units
with each other.
4) Replacement of male power jumper connector (CN41)
must be performed only on one of the heat source units.
5) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only
one of the heat source units.
6) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 72 model or above is connected) are con-
nected.
HWE09080
Move the male connector
Group
from CN41 to CN40.
SW2-1 OFF
OS1 OC
52 51
TB5
TB3 TB3
M1 M2
M1 M2
TB7 TB7
S M1 M2 S
To be left
unconnected
To be connected
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS1 OC
55 54
TB5
TB3
M1 M2
M1 M2
TB7
M1 M2
S S
To be left
unconnected
To be left
unconnected
L12
Group
IC IC
01 03
TB15 TB5 TB15
S 1 2 M1 M2 S 1 2
A B A B
MA MA
L22
Group
IC IC
02 04
TB5 TB15
TB15
S 1 2 M1 M2 S 1 2
A B
MA
(3) Maximum allowable length
1) Indoor-heat source 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 [5] 1.
4) Maximum line distance via heat source unit
2
(1.25mm [AWG16] or larger)
L12+L31+L22 500m [1640ft]
L11+L31+L21 500m [1640ft]
- 31 - 31
Interlock operation with
the ventilation unit
Group
LC
IC
06 07
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
MA
IC
05
TB5 TB15
M1 M2 S 1 2
2
[AWG16] or larger)
GB