Applies To

All AHN Heat Pumps and Traditional Series Heat Pumps manufactured after 2019 or equipped with the four-button controller.

Question / Problem

How do I connect a remote system to a heat pump with a four-button controller?

Common Installation / Application Conditions

• The heat pump is installed and operating with the built-in four-button digital controller.
• An external automation or remote system will be used to start and stop heating.
• The remote system provides either a two-wire dry contact connection or a three-wire common and spa connection. In a three-wire connection, the pool wire from the controller is not used.
• All remote wiring is low-voltage control wiring (18-gauge minimum) routed in accordance with local electrical codes.
• Power to the heat pump and the remote automation system must be turned off before making or changing any connections.

Step-by-Step Resolution

Identify which type of remote connection you have by reviewing the documentation for the automation or remote system. Follow the corresponding set of instructions below.

Option 1: Connect a Two-Wire Remote to the Y and Z Terminals

1. Disconnect Power

   Turn off power to the heat pump and the remote automation system at the breakers.

2. Connect the Wiring

   Connect the two low-voltage wires from the remote system to the terminals labeled Y and Z on the heat pump microprocessor board.

3. Restore Power

   Close the heat pump access panels and restore power to both the heat pump and the remote automation system.

4. Turn the Thermostats Off

   Turn the pool thermostat off and turn the spa thermostat off.

5. Begin Control Board Configuration

   Simultaneously press and hold the UP and DOWN keys until CF1 appears on the display.

6. Set LOC

   Press the POOL/SPA key until LOC appears. Press the UP key until the display shows 50.

7. Set JAO

   Press the POOL/SPA key until JAO appears. Press the UP key until the display shows 2, then wait.

8. Confirm Operation

   After about 15 seconds, the water temperature will appear. The heat pump is now configured for two-wire remote operation using the Y and Z terminals.

Option 2: Connect a Three-Wire Remote to the FS-2 Terminals

In this option, only the Common (C) and Spa (H) wires from the external controller are used. The Pool wire from the controller is not used. These controllers switch the heat pump thermostats between Pool and Spa.

1. Disconnect Power

   Turn off power to the heat pump and the remote automation system at the breakers.

2. Run Low-Voltage Wiring

   Route 18-gauge minimum low-voltage wiring from the external controller Common (C) and Spa (H) terminals. The pool wire is not used.

3. Connect to FS-2

   Connect the Common (C) and Spa (H) wires from the controller to the FS-2 terminals on the heat pump using female spade connectors.

4. Restore Power

   Close the heat pump access panels and restore power to both the heat pump and the controller.

5. Turn on Circulation

   Turn on the pool circulation pump.

6. Set Temperatures

   Set the desired pool and spa temperature set points on the heat pump controls.

7. Begin Control Board Configuration

   Simultaneously press and hold the UP and DOWN keys until CF1 appears on the display.

8. Set LOC

   Press the POOL/SPA key until LOC appears. Press the UP key until the display shows 50.

9. Set JAO

   Press the POOL/SPA key until JAO appears. Press the UP key until the display shows 1, then wait.

10. Confirm Operation

    After about 15 seconds, the water temperature will appear. The heat pump is now configured for three-wire remote operation using the FS-2 terminals. When the external controller selects Pool, the FS-2 circuit is open and the heat pump follows the Pool temperature setting. When the external controller selects Spa, the FS-2 circuit is closed and the heat pump follows the Spa temperature setting.

Tips / Additional Notes

• When a remote system is calling for heat, the heat pump display will show Spa mode regardless of which body is being heated.
• Refer to the remote or automation system manual for any additional configuration requirements.
• If the remote system does not start the heat pump, verify wiring connections, circulation flow and that temperature set points are above the current water temperature.

Visual Reference

Option 1: Terminal group used for two-wire (Y and Z) connection.

Option 2: Terminal group used for three-wire (FS-2) connection.