Leisure Temp LT1000, Installation Manual

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b.1 Connecting Smart Bus Controllers
External Controller
Communication Port
Wire Connections
1. Deactivate power to heat pump and external controller.
2. Remove electrical access panels on the heat pump and external controller.
3. Route 22-gauge, 2-conductor, low-voltage wires from the external controller
communication port (com port) to the low voltage side of the heat pump's electrical
enclosure. Do not use the power or ground wire.
Figure 1
4. Connect control wires to the heat pump's "Port B" of the
microprocessor as indicated. See Figure 1 and Figure 2.
l
It is OK to double up wires at the external controller
connection if necessary.
l
If, for example, the external controller is using the data
port for an indoor controller, add wires to the existing
configuration.
Connectors can be removed from
terminals for ease in connecting wires. See Figure 3
Typically a smart bus controller will have four wires on its smart bus for a heat pump. The
power and ground (usually the 1st and 4th wire) are not used.
Figure 2
Figure 3
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