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Thread: 3M-50 Wi-Fi Thermostat

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  1. #1
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    3M-50 Wi-Fi Thermostat

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    The 3M-50 is a Wi-Fi Thermostat that can be controlled for a computer, Iphone or smart phone. The 3M-50 can be programmed as a 7 day, 5-1-1 or 5-2 thermostat. The 3M50 can be setup for full or partial system lock functionality and is provided with a 5 year warranty.

    Radio Thermostat CT50 7-Day Programmable Thermostat (WiFi Enabled), iOS & Android App Controls




    The 3M-50 can run on 3 AA batteries (not provided) or if your system has a common C wire the 3M50 will run on the R and C wires. A constant power source (24 volts A/C power to the R terminal and the C wire connected to the common side of the 24vac transformer) is required when using a radio module.

    Update amazon now offers a free smart home consultation

    3M-50 thermostat additional features:
    Change filter indicator for cleaner air
    Vacation and holiday program
    Mercury free
    Energy-saving home and away button


    3M-50 thermostat is compatible with:
    Compatible with most residential HVAC systems
    One or two stage cooling units
    One or two stage conventional heating systems (gas/oil/electric)
    Heat Pumps with single stage or with auxiliary heat
    Zoned forced air and zoned hot water 2 or 3 wire
    millivolt systems


    Manual
    radiothermostat.com/filtrete/guides/3M-50-Installation-27may10.pdf


    Operation Manual
    radiothermostat.com/filtrete/guides/3M-50-Operation-13may10.pdf



  2. #2
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    4 wire Filtrete 3m50 wiring diagram for a 1 cool 1 heat unit

    4 wire Filtrete 3m50 wiring diagram for a 1 cool 1 heat unit
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  3. #3
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    Filtrete 3m50 2 cool 2 heat wiring diagram

    Filtrete 3M-50 2 stage cooling 2 stage heating wiring diagram
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  4. #4
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    Filtrete 3M-50 heat pump with aux heat wiring diagram

    Filtrete 3M-50 heat pump with aux heat wiring diagram
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  5. #5
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    I have this stat and may have a problem with it. I have noticed the 2nd stage of my American Standard Alligence 16 keeps cycling. In fact, the flashing "cooling" for 1st stage running flashes but the "2nd stg" does not even show up on the display when it does run. I also noticed that the voltage across RC to Y2 keeps going from 24vac (comp off) to 4vac (comp on, but should be 0vac) which explains the cycling of the compressor. My question, is the 3M-50 doing this, if not where else do I look? I verfied and re-verified all wiring.


  6. #6
    HVAC Thermostat Specialist

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    Is your 3m-50 set up for 2 stage cooling #3 or #5?

    With mode in off press menu and touch HVAC SET UP. Use +/- icons to select HVAC SET UP number on screen. The LCD display will show your selection and indicate the number of stages you have selected. During setup, 2nd stage will blink when both heat and cool have 2nd stages.

    If you have a Normal HVAC system and you want fast temperature recovery:
    HEAT and COOL select 1
    2 stage HEAT, 1 stage COOL select 2
    2 stage HEAT, 2 stage COOL select 3

    If you want efficient [but slower] recovery...
    2 stage HEAT, 1 stage COOL select 4
    2 stage HEAT, 2 stage COOL select 5

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