Aquacal Leisure Temp LT55 Installation Manual page 32

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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Figure 4