Grant heat pump settings

The Passiv Smart Thermostat requires the following changes on the Grant controller to permit communication. Please set the following parameters in the Service Level menu. The Service Level menu is accessed by pressing the “-” or “+” buttons to change the first two digits to 99 and then press the “+” button. The second two digits will blink. Press the “-” or “+” buttons to change these to 99 and press the “+” button. The parameter value will be displayed as “0”, press the “+”,”-” to change the value to “738” and then press the set (tick) button:

- 52 01: BMS Address changed from 1 to "207"

- 52 02: Baud rate changed to "3" for 9600 baud rate

- 52 03: Stop bit changed to "1" for 1 stop bit

- 52 04: Parity changed to "0" for even parity

To prevent accidental changes on the Grant remote controller, set the key lock by pressing the bottom left key lock button for 3 seconds.