Mitsubishi Electric G-50A Technical Manual page 27

Table 5-3 Connection number of Power supply unit PAC-SC50KUA
Connectable
Power supply unit
G-50A/system
PAC-SC50KUA
(2) Connecting to the indoor/outdoor transmission line
To connect G-50A to the indoor/outdoor transmission line, use the DC12V output terminal (TB3) of PAC-
SC50KUA only to supply DC12V from this terminal to G-50A.
For the M-NET terminal of G-50A, connect the indoor/outdoor transmission M-NET line.
*The M-NET terminal (TB2) of PAC-SC50KUA is not used. Never connect the M-NET line.
When connecting G-50A to the indoor/outdoor transmission line, the quantity of indoor units
connectable to the refrigerant system decreases. The quantity of indoor units connectable is decreased
by 2 sets per 1 set of the system controller (including G-50A) connected to the indoor/outdoor
transmission line.
[Example : In case of BIG Y Series (PUHY-P400YMF)]
The quantity of indoor units connectable to an outdoor unit counts for 16 sets. When connecting the
system controller (like G-50A) to the indoor/outdoor transmission line, the connectable quantity will be
14 sets. (16 sets –2 sets = 14 sets)
PUHY-P400YMF
M-NET model
001
G-50A
TB3 TB2
(DC12V) (M-NET)
Power supply unit
PAC-SC50KUA
1 set Together with G-50A, other system controllers can be connected to the
centralized control transmission line. The G-50A of one set and other system
controllers up to 4 sets can be connected to the centralized control
transmission line.
When connecting the Lossnay remote controller to the centralized control
transmission line, that up to 16 sets can be connected when one set of G-50A
is connected without other SCs.
The table below converts the receiving capacity of each system controller into
that of Lossnay for your reference.
System remote controller : PAC-SF44SRA
Schedule timer : PAC-YT34STA
Group remote controller : PAC-SC30GRA
ON/OFF remote controller : PAC-YT40ANRA
002 010
For the connection with the indoor/outdoor transmission line, connect
the DC12V output (TB3) of PAC-SC50KUA only to G-50A.
For the M-NET terminal of G50A, connect the indoor/outdoor transmission line.
Never connect the M-NET line to the M-NET terminal (TB2) of PAC-SC50KUA.
Allow the wiring length of DC12V up to 10m maximum.
Figure 5-6 Connection of the indoor/outdoor transmission line
Remarks
Receiving capacity of system controllers
Type of system controller
011 012 013
Converted in Lossnay numbers
2 sets
2 sets
2 sets
4 sets
014 015 016
Connectable sets reduced
23