To enable the Passiv Smart Thermostat to control Mitsubishi heat pumps, it requires a MelcoBEMS mini communication module, which is fitted and connected inside the Mitsubishi indoor unit.
On the MelcoBEMS mini are a set of eight DIP switches which must be set correctly 1 OFF, 2-7 ON, 8 OFF for the Passiv Smart Thermostat to communicate successfully with the heat pump.
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MelcoBEMS in the middle of the RS485 cable runMelcoBEMS at the end of the RS485 cable run
Guidance
- Connect both screened drain wires together, insulate and carefully locate it at the edge of the unit to reduce the chance of a short-circuit. Do NOT use the GND connection for this purpose
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RS485 termination within the Passiv Programmer (see the Installation guide page 9)
Guidance
- Do NOT use the RS485 termination within the Passiv Programmer (see the Installation guide page 9)
- Unscrew the MelcoBEMS mini and connect the jumper J1 inside the module. This connects a termination resistor.
Connect the pre-fitted red connector to CN105 red connector on the right-side of the main PCB and secure the MelcoBEMS mini safely inside the unit.