Remotec ZXT120 - cannot set temperature

I’m having trouble getting the Remotec ZXT120 to set and/or stick to any specific temperature on a mini-split indoor unit. For example, the Lovelace card (default named Remotec ZXT-120US Mode) has up/down arrows to set the temperature, but always defaults back to 32F. The wall unit will beep indicating commands received (on, off, mode change, fan, vanes) all work, but not setting temperature.

Because of that I tried creating a script to simply set the HVAC mode to cool and the temperature to 72F.

The script is:

hvac_cool:
alias: set HVAC to cool and 72F
mode: single
sequence:

  • device_id: …
    domain: climate
    entity_id: climate.remotec_zxt_120us_mode
    hvac_mode: cool
    temperature: 72
    type: set_hvac_mode

When running the above script, the error is:
hvac_tool: Error executing script. Invalid data for device at pos 1: extra keys not allowed @data[‘temperature’]

Any ideas? Docs are for the Remotec are thin wrt to HA.