23
(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)
Table 5-3 Connection number of Power supply unit PAC-SC50KUA
Power supply unit
PAC-SC50KUA
Connectable
G-50A/system
1 set
Remarks
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.
Type of system controller
System remote controller : PAC-SF44SRA
Schedule timer : PAC-YT34STA
Group remote controller : PAC-SC30GRA
ON/OFF remote controller : PAC-YT40ANRA
Converted in Lossnay numbers
2 sets
2 sets
2 sets
4 sets
Receiving capacity of system controllers
Figure 5-6 Connection of the indoor/outdoor transmission line
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.
PUHY-P400YMF
M-NET model
Connectable sets reduced
001
002
G-50A
010
011
012
013
014
015
016
Power supply unit
PAC-SC50KUA
TB3
(DC12V)
TB2
(M-NET)
Summary of Contents for Central Controller G-50A
Page 2: ......
