Lennox MMA048S4

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4. Connection to Centralized Controller, ON/OFF and Alarm Devices
4.1. Centralized Controller
Mini-Split indoor units can be connected to a centralized controller (e.g. Lennox VRF Manager - LVM or Trane
Tracer) or a BACnet or Lonworks gateway using the XYE terminals on the indoor unit main board.
To CCM
Comm.Bus
X Y
(
E
)
Y/G
Figure 13. Typical Central Controller Connection Point Example
Figure 14. Typical Central Controller Connection Point Example 2
4.2. ON/OFF Devices
Mini-Split indoor units can be connected to an external device such as a re alarm system using two dry contacts on
the indoor unit main board. These dry contacts allow the external device to turn the indoor unit on or o󰀨.
Dry contacts can be used for
alarm notice that oat switch
tripped etc.
Remote on-o
ports
Central
control
ports (VRF)
Figure 15. Indoor Unit Connection Points for ON/OFF