Aquacal HeatWave SuperQuiet SQ120R, Installation Manual

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c.2 Connecting Two-wire Controllers (with internal thermostat)
PLEASE NOTE
2-Wire controllers are not designed to control chiller operation.
For full functionality, the Heat and Cool, and Cool Only heat pumps must use an external
controller that has a SMART bus connection. Check with the external controller
manufacturer for more information.
DANGER
Failure to heed the following will result in injury or death.
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RISK OF ELECTRICAL SHOCK FROM ENERGY STORED IN CAPACITORS - MODELS EQUIPPED
WITH VARIABLE FREQUENCY COMPRESSOR DRIVES STORE ELECTRICITY EVEN AFTER THE
POWER HAS BEEN DEACTIVATED AT THE POWER BREAKER.
Wait for 2 minutes after the shut down
of equipment before servicing.
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Deactivate power while routing wiring to control board.
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Follow all National Electric Codes (NEC) and/or State and Local guidelines.
WARNING
Failure to heed the following may result in injury or death.
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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.
Figure 4
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.
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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.
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 " on the next page.
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