Connecting Smart Bus Controllers - Aquacal WATER SOURCE WS03 Installation Manual

NOTICE
Do not use an electric heater connection on external controllers for
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heat pump wiring. This can cause damage to external controllers, heat
pumps, and pad equipment. This damage is NOT covered by warranty.
The wire size connecting the external controller to the heat pump must be 22-
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gauge, 2-conductor, low-voltage wire.
Use the two middle data lines on the external controller's standard communication port (RS-485). Do not use the
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outside power or ground connection on the port.
c.1 Connecting Smart Bus Controllers
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.
4. Connect control wires to the heat pump's "Port B" of the
microprocessor as indicated. See Figure 1 and Figure 2 .
It is OK to double up wires at the external controller
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connection if necessary.
If, for example, the external controller is using the data
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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
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Failure to heed the following may result in damage to equipment.
Figure 3
External Controller
Communication Port
Figure 1