Smart Thermostat Accent Air Central AC Installation/Assistance

LMarcman on 26/05/2022 - 17:08

G’day all,

I was hoping someone in the community can assist me with a goal of installing a smart thermostat (preferably the Ecobee) into my existing central ducted unit. The unit is an Accent Air unit with a BM2 24H 4Z wall mounted controller and is controlling 4 zones (bedroom, lounge etc)

The controller does not seem to have the correlating standard wires coming out of the wall like most thermostats hence not sure where these should be connected on the Ecobee. My unit has 4 wires, see pictures and is not labelled like the Ecobee (G, Rc, Rh, O/B, Y, W, C etc)

I have done quite a bit of research (youtube, forums etc) and whilst I understand a C wire is needed for the smart thermos, nothing really fits my scenario for the balance of cables. Here is what I have found that may be useful.

Voltage Multi meter readings from the wall controller below;
• Measuring COM and Power-C I get 36V
• Measuring Key-A and Power-C I get 24V

That leads me to think is the 24V between Key-A and Power-C a C Wire?
I assume my yellow cable is a sensor based of the labelling however where would the rest of the cables need to go?

Ideally would be to have the new thermostat control the temperature (AC / Fan) schedule operation hours and turn on / off the 4 zones)

I would highly appreciate if someone can point me in the right direction on how to do it or if you know someone who can do it in the Gold Coast.

PS I am yet to buy the Ecobee hence happy to take feedback.
Thanks in advance.

Pics below:
https://imgur.com/a/DPr8RH3

Electrical & Electronics

Comments

  • Stewardo on 26/05/2022 - 17:13
    +1

    https://www.ezlink.store/

    • Marcman on 26/05/2022 - 17:24

      My system not listed and no stock on the others. Have messaged them :) Thanks though.

  • Marcman on 26/05/2022 - 17:16

    Thanks @Stewardo.

  • Marcman on 01/06/2022 - 20:40

    Ezlink are not responding and last updates a few year ago hence nudging this post to see if anyone else had any suggestions please.

  • lgacb08 on 04/06/2022 - 21:12

    Based on the diagram of the system I don't think Ecobee will be a good choice, you're likely to get 24vac and ground to power the ecobee from power-c and com but the control signal could be proprietary because the other 2 wires might send digital signal to the main board to control the damper and other things. Remember ecobee and nest are designed to work with dump HVAC and multiple wires for each signal, it's not designed to work with a little smarter system where manufacturers uses multiple digital pulses into single wire or two to control it. Best outcome you might get is turning the whole system on/off to reach set temperature but you don't known until you try.
    To tell if you need external power, measure voltage between com and power-c when the system is off and running to see any changes, if it remains consistent 24v then it's sufficient to get the ecobee to power on and function but that's just a starting point.

  • Marcman on 15/06/2022 - 06:49

    Sorry for the delayed reply. Thanks for the advice. I’ll give that a try and feedback on outcome.

  • rahuahuj on 02/07/2023 - 20:23

    Hey .. did you go with Ecobee or some other brand?
    Thanks

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