Aquacal WATER SOURCE WS03 Installation Manual page 38

WARNING
This section is only for qualified installers who are familiar with the swimming pool and spa safety standards.
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The installer must be familiar with service industry techniques.
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1. Deactivate power to heat pump.
2. Remove heat pump electrical access panel.
3. Route 22-gauge (minimum), 2-conductor, low-voltage wires from the
controller to the low voltage side of the heat pump's electrical
enclosure. Follow all National Electric Codes (NEC) unless State or
Local guidelines supersede.
4. Connect the controller wires to the microprocessor port labeled "Ext
Controller" with the terminals labeled "Y" and "Z" as follows. See
Figure 4 .
Connect one wire to "Y".
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Connect other wire to "Z".
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The polarity of the wire is not important.
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5. Reattach heat pump access panel.
6. Apply power to heat pump.
7. Configure the heat pump to accept a 2-wire external controllers signal as shown. See "Configure 2-wire
controller" below.
Configure 2-wire controller
Enter "Installer Menus", then proceed
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Failure to heed the following may result in injury or death.
Figure 4