Mitsubishi Electronics PAC-YG60MCA Example of System Configuration, Restrictions

5Example of System Configuration

Up to 4 contacts

* This figure omits the power supply line and only shows the transmission line.

Note:

•For the shield ground of the M-NET centralized control line for central control, use single-point grounding at the power unit for the transmission line.

However, when supplying electric power to the M-NET centralized control line from the R410A series outdoor unit without using a power supply unit for the transmission line, use single-point grounding at the TB7 of that outdoor unit.

Furthermore, when connecting this device to the M-NET indoor control line, use grounding at the TB3 for each outdoor unit system.

•Connecting an Uninterruptible power supply (UPS) to the 24 VDC power supply is recommended in order to prevent the loss of pulse data in the event of a power failure.

If a UPS cannot be connected, try to make the AC power supply to the 24 VDC power supply as much same as the power supply line to the meters.

•This device does not support level meters. To use a level meter, incorporate a Converter circuit externally and convert to pulse input.

•If this device is connected to an M-NET indoor control line and the outdoor unit is down because, for example, the power supply is interrupted for servicing or there is a failure, the PI controller cannot be controlled from the system controller.

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