2. M-NET control
DATA U5
SYSTEM DESIGN
Syste
m H
The power to System controller (excluding LMAP03-U) is supplied via M-NET transmission line. M-NET transmission line
at TB7 side is called Central control transmission line while one at TB3 side is called Indoor-Outdoor transmission line.
There are 3 ways to supply power to the System controller .
A) Connecting to TB3 of the Outdoor unit and receiving power from the Outdoor unit.
B) Connecting to TB7 of the Outdoor unit and receiving power from the Outdoor unit.
C) Connecting to TB7 of the Outdoor unit but receiving power from power supply unit PAC-SC51KUA.
Maximum 3 System controllers can be connected to TB3.
If there is more than 1 Outdoor unit, it is necessary to
replace power supply switch connector CN41 with CN40
on one Outdoor unit.
Maximum 3 System controllers can be connected to TB7
and receiving power from the Outdoor unit.
It is necessary to replace power supply switch connector
CN41 with CN40 on one Outdoor unit.
2-3-3-A. When connecting to TB3 of the Outdoor unit and receiving power from the Outdoor unit.
2-3-3-B. When connecting to TB7 of the Outdoor unit and receiving power from the Outdoor unit.
2-3-3-C. When connecting to TB7 of the Outdoor unit but receiving power from PAC-SC51KUA.
2-3-3. Ensuring proper power supply to System controller
Outdoor unit
MA remote controller
Group
Group
Indoor unit
M-NET transmission lines
(transmission lines
for central controller)
Outdoor unit
ME remote controller
Group
Group
Indoor unit
Replacement of
CN41 with CN40
Use CN41
as it is.
TB7
TB3
System controller
(excluding LMAP03-E)
M-NET transmission lines
(Indoor-Outdoor transmission lines)
TB7
TB3
System
controller
Maximum 3 System controllers can be connected to TB3,
but maximum 2 in the case of G-50A.
Fig. 2-3-3-A
M-NET transmission lines
(transmission lines
for central controller)
MA remote controller
ME remote controller
Group
Group
Group
Group
Indoor unit
Indoor unit
TB3
Outdoor unit
Outdoor unit
Replacement of
CN41 with CN40
Use CN41
as it is.
System
controller
TB7
TB7
TB3
Maximum 3 System controllers can be connected to TB7.
M-NET transmission lines
(Indoor-Outdoor transmission lines)
Fig. 2-3-3-B
PAC-SC51KUA
M-NET transmission lines
(transmission lines
for central controller)
MA remote controller
ME remote controller
Group
Group
Group
Group
Indoor unit
Indoor unit
TB3
Outdoor unit
Outdoor unit
Use CN41
as it is.
Use CN41
as it is.
System
controller
TB7
TB7
TB3
CAUTION
M-NET transmission lines
(Indoor-Outdoor transmission lines)
Fig. 2-3-3-C
When using PAC-SC51KUA to supply transmission
power, the power supply connector CN41 on the Outdoor
units should be kept as it is. It is also a factory setting.
1 PAC-SC51KUA supports maximum 1 AG-150A unit
due to the limited power 24VDC at its TB3.
However, 1 PAC-SC51KUA supplies transmission power
at its TB2 equal to 5 Indoor units, which is referable at
Table 2-3-2.
If PZ-52SF, Timers, System controller, ON/OFF controller
connected to TB7 consume transmission power more
than 5 (Indoor units), Transmission booster
PAC-SF46EPA is needed. PAC-SF46EPA supplies
transmission power equal to 25 Indoor units.
AG-150A / G-50A is recommended to connect to TB7 because it performs back-up to a number of data.
In an air conditioner system has more than 1 Outdoor units, AG-150A / G-50A receiving transmission power through TB3 or TB7 on one of the Outdoor units
would have a risk that the connected Outdoor unit failure would stop power supply to AG-150A / G-50A, and disrupt the whole system.
When applying apportioned electric power function, AG-150A / G-50A is necessary to connected to TB7 and has its own power supply unit
PAC-SC51/50KUA.*
*Power supply unit PAC-SC50KUA is for G-50A, and PAC-SC51KUA is for AG-150A.
4 - 77
