Selecting The Power Supply Unit - Mitsubishi Electric G-50A Technical Manual

5.1.3 Selecting the power supply unit

G-50A is driven by DC12V from the Power supply unit : PAC-SC50KUA. To communicate with the air
conditioner, it is necessary to connect to the M-NET transmission line in addition.
First determine whether G-50A is connected to the centralized control transmission line or to the
indoor/outdoor transmission line.
Centralized control
transmission line
G-50A
TB3
(DC12V)
TB2
(M-NET)
Power supply unit
PAC-SC50KUA
To connect with the centralized
control transmission line,
leave the power supply
connector of the outdoor unit
being connected to CN41.
CAUTION
(1) Connecting to the centralized control transmission line
The Power supply unit : PAC-SC50KUA is required.
Upper class SC
No. 000 unit
(DC12V)
(M-NET)
Power supply unit
PAC-SC50KUA
Lower class SC
Connectable wit Lossnay remote controller
but with restriction on the connecting numbers
22
Indoor/outdoor transmission line
Outdoor unit
ME remote controller
Power supply unit
Figure 5-4 Caution for power supply
As G-50A works to back up each data, recommend to install it on the centralized
control transmission line.
If G-50A is installed on the indoor/outdoor transmission line, communication can
not be performed even with air conditioners in other systems at power failure if
occurred on the connected outdoor unit. To use the power consumption
apportioning function, therefore, be sure to install it on the centralized control
transmission line.
Centralized control
transmission line
TB3
TB2
No.201 unit
Figure 5-5 Connection of centralized control transmission line
To connect with the indoor/outdoor transmission line,
G-50A
connect the DC12V output (TB3) of PAC-SC50KUA to
G-50A only. For the M-NET terminal (TB2) of G-50A,
connect the indoor/outdoor transmission line.
Never connect M-NET line to the M-NET terminal (TB2) of
TB3 TB2
PAC-SC50KUA.
(DC12V) (M-NET)
Allow the wiring length of DC12V up to 10m maximum.
Please observe the following restrictions also.
- Connect the power supply connector to CN40 on the one
PAC-SC50KUA
- outdoor unit only.
- To use the power consumption apportioning function,
- do not install on the indoor/outdoor transmission line.
Indoor/outdoor transmission line
Indoor/outdoor transmission line
Lossnay Lossnay
Transmission line
booster unit
(PAC-SF46EP)
Lossnay