External Controllers

To support a direct connection to an external controller, AquaCal® chillers are equipped with option terminal blocks. These terminals are on the microprocessor located on the low-voltage side of the electrical enclosure.

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

  • This section is only for qualified installers who are familiar with swimming pool and spa safety standards.
  • The installer must be familiar with service industry techniques.
  • Deactivate power while routing wiring to control board.

CAUTION - Failure to heed the following may result in equipment damage.

  • The wire size connecting the controller must be 16-gauge, 2-conductor, or larger low-voltage wire.
  • Use direct connection (dry contact) provided on the microprocessor for external controllers.

Connections to Chiller

Dry Contact Connection Points to the Microprocessor

Figure 1

Please confirm the type of external controller to be installed and follow the appropriate instructions.

  • A two-wire controller (with an internal thermostat). The user can set and adjust the temperature at the controller's screen.
  • A three-wire controller (with an "OFF" position). The user adjusts the temperature at the heat pump. The user can select pool or spa mode or turn off the heat pump using the controller.
  • A three-wire controller (without an "OFF" position). The user adjusts the temperature at the heat pump. The user can select pool or spa mode, but must turn off the heat pump at the heat pump control panel.

Two-wire controller (with internal thermostat):

  1. Deactivate power to chiller.
  2. Remove chiller electrical access panel.
  3. Route the control wiring to the low voltage side of the electrical enclosure. Follow all National Electric Codes (NEC) unless State or Local guidelines supersede.
  4. Connect the controller wires to the microprocessor as follows:
    • Connect one wire to “Y”. See Figure 1.
    • Connect other wire to “Z”.
    • The polarity of the wire is not important.
  5. Reattach chiller access panel.
  6. Apply power to chiller.
  7. Program chiller for a two-wire controller. See "Programming for External Controller - using JAO interface"
  8. Test external controller. See "Operating Chiller (With an External Controller)"

 

Three-wire controller (with "OFF" position):

  1. Deactivate power to chiller.
  2. Remove chiller electrical access panel.
  3. Route the control wiring to the low voltage side of the electrical enclosure. Follow all National Electric Codes (NEC) unless State or Local guidelines supersede.
  4. Connect the controller wires to the microprocessor as follows:
    • Connect "High" or "Spa" wire to "X". See Figure 1.
    • Connect "Common" wire to "Y".
    • Connect "Low" or "Pool" wire to "Z".
  5. Reattach chiller access panel.
  6. Apply power to chiller.
  7. Program chiller for a three-wire controller. See "Programming for External Controller - using JAO interface"
  8. Test external controller. See "Operating Chiller (With an External Controller)"

 

Three-wire controller (without an "OFF" position):

  1. Deactivate power to chiller.
  2. Remove chiller electrical access panel.
  3. Route the control wiring to the low voltage side of the electrical enclosure. Follow all National Electric Codes (NEC) unless State or Local guidelines supersede.
  4. Connect the controller wires to the microprocessor as follows:
    • Connect "Common" wire to one terminal of "FS2". See Figure 1.
    • Connect "Spa" to other terminal of "FS2".
    • The third wire is not used.
  5. Reattach chiller access panel.
  6. Apply power to chiller.
  7. Program chiller for an external controller. See "Programming for External Controller - using FS2 interface"
  8. Test external controller. See "Operating Chiller (With an External Controller)"