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.

 

  • 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.
  • Deactivate power while routing wiring to control board.
  • Follow all National Electric Codes (NEC) and/or State and Local guidelines.

WARNING

Failure to heed the following may result in injury or death.

 

  • This section is only for qualified installers who are familiar with the swimming pool and spa safety standards.
  • 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.
    • Connect one wire to ā€œYā€.
    • Connect other wire to ā€œZā€.
    • 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.

 

Configure 2-wire controller

Enter "Installer Menus", then proceed