Connection To Centralized Controller, On/Off And Alarm Devices; Centralized Controller; On/Off Devices - Lennox MMA018SM4 Service Manual

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.

4.2. ON/OFF Devices

Mini-Split indoor units can be connected to an external device such as a fire 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 off.
Figure 13. Typical Central Controller Connection Point Example
Figure 14. Typical Central Controller Connection Point Example 2
Dry contacts can be used for
alarm notice that oat switch
tripped etc.
Figure 15. Indoor Unit Connection Points for ON/OFF
(E)
X Y
Y/G
To CCM
Comm.Bus
Central
Remote on-o
control
ports
ports (VRF)
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