Compatibility and System Design
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      Installing a Homely on a Grant Heat Pump

      Reference Documentation

      For guidance on wiring a three-port valve and DHW cylinder temperature sensor, refer to:

      📄 Grant Aerona³ (R32) Installation and Servicing Instructions (DOC 0136 Rev2.4, Feb. 2024)

      🔗 Download the document

       

      Key Sections:

      • Appendix C (Page 81): Wiring for a three-port valve with hydraulic separation

      • Appendix M (Page 89): Wiring for a three-port valve with no hydraulic separation

       

      Key Components for Installation

      For a Grant Aerona³ installation with Homely, the most important components are:

      ✅ V4044C Diverter Valve

      ✅ Aerona³ Controller

      ✅ DHW Cylinder Temperature Sensor

      ✅ ASHP Terminals

       

      Components that can left unconnected when using Homely

      The following components should not be connected, as they are unnecessary:

      🚫 HPIDTM4 DHW Timer

      🚫 EP002 Heat Pump Interface

      🚫 Hot Water Priority Relay (HPWPR1)

       

      Additional Wiring Considerations

      • If zone valves, buffer valves, or secondary pumps are present, their contacts can be wired in as described in the Homely Installation Manual.

      • Since Homely sends heating/DHW commands directly to the Grant controller, no remote contacts need to be wired in.