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  1. #1

    Exclamation Install help - Ecobee Smart Si on a fan coil system

    I bought an Eco Bee Smart Si Thermostat. The system is an AE -Air fan coil running on the building's cold and hot water loops. The only control I have in the system is opening and closing the actuator vales for the hot or cold loops and running the fan. See the system:

    The old thermostat had 5 wires. R/C/W/Y/G, I wired them accordingly to the smart si thermostat. See the wiring digram of how things are wired now that I drew.

    The problem I am having is I can not get the system work work properly. Do I call this a heat pump in the thermostat settings? If I do then I can get the cold system working, but not the hot. If I call it a furnance I can get the hot system working but not the cold. Have I made a mistake on the wiring, or is there a setting in the thermostat that is wrong? It seems to me this should be a very simple system. There are two valves and a fan, nothing more.

    Any help is appreciated in setting this up.

  2. #2
    Join Date
    Oct 2010
    Anderson, South Carolina, United States
    No DIY on this site. Call a pro to get it set up properly. Dependent on what type of control voltage you are working with the ecobee stat may not work for that application.

  3. #3
    The Transformer is 24V. If it makes you feel better the install was done by my brother who is a tin basher. He just doesn't know the product very well and he was just in town for an hour.

  4. #4
    Join Date
    Oct 2010
    Anderson, South Carolina, United States
    A tech should be able to get it going if its 24v. We aren't allowed to get into specifics with Homeowners on this site

  5. #5
    Join Date
    Jan 2004
    You don't have the configuration settings correct. Keep reading them.
    Contractor locator map


    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Jul 2008
    Rochester NY
    I've started an album of chart screenshots from my Ecobee portal. Look what can be learned by tracking how a home and it's equipment interact with each other and the environment.

    This thing tracks indoor, outdoor temps, run time, and RH.

    Each vertical red line represents up to 5 minutes of run time.
    Green line is indoor temp
    Black is outdoor temp.
    Dotted red is set temp

    Really interesting to see cycle time and impact.

    Name:  ecobee%u00252B%2Bweb%2Binterface%2B-%2BGoogle%2BChrome%2B10132012%2B105220%2BPM.bmp.jpg
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    Last edited by tedkidd; 10-25-2012 at 01:32 AM.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to, or RESNET, and find an auditor near you.

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