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    Yes. Replacing industry standard with updated...

    Yes. Replacing industry standard with updated version of industry standard.
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    If this was an HVAC forum I'm thinking they would...

    If this was an HVAC forum I'm thinking they would say what you are doing is not recommended. When combining systems they need to have matched blower sizes otherwise the lower speed one may be...
  3. Thread: Wire id

    by Stuff
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    Some of those old thermostats used the 6 as a...

    Some of those old thermostats used the 6 as a inverse heat to close a zone valve in a hot water system. Modern valves are spring loaded so they close when power is removed and don't need a 6. Older...
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    I think you dove too deep into this. PWM is...

    I think you dove too deep into this. PWM is Pulse Width Modulation and isn't normally enabled for hydronic systems but for electric systems. Check if the thermostat has it enabled - pg 18 (radiant...
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    Todd - If you don't have gas/oil/propane then...

    Todd -
    If you don't have gas/oil/propane then most likely the "emergency heat" is an electric coil and can be configured as auxiliary heat which will make your life easier. Move the white wire to...
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    1 - Your system uses a proprietary 3 wire...

    1 - Your system uses a proprietary 3 wire thermostat feed so Nest or any other regular thermostat won't work with it. 1, 2, 3 are ground, power, and data (or something like that).

    3 - Looks like...
  7. From your description of X going to the...

    From your description of X going to the transformer at the equipment end it should be a common wire so connect to Nest's C. Hooking up a C wire prevents some strange problems down the road.

    Nest ...
  8. With a standard gas furnace the fan/blower is...

    With a standard gas furnace the fan/blower is controlled by the furnace itself. Blower doesn't start until a bit after the burner as don't want to circulate cold air. Then continues running for a...
  9. If it didn't work right with a professional...

    If it didn't work right with a professional install then you should review the entire system. Do you have a gas furnace, electric furnace, or heat pump? What model numbers are the outside unit and...
  10. Change thermostat settings from gas to electric...

    Change thermostat settings from gas to electric heat and then the fan will do what you want.
    Look on page 7 of the manual -...
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    Now makes some sense. Blue does go to B (usually...

    Now makes some sense. Blue does go to B (usually Ruud or Rheem system outside). That thermostat needs a jumper added between Y and W for heat pump applications. See figure 7: ...
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    move the blue to O. otherwise make sure to...

    move the blue to O. otherwise make sure to program the thermostat to say that it is a heat pump.

    Something not right as the1F86-0244 doesn't have a B terminal or separate Rh/Rc. It has a single...
  13. It seems every boiler installation is unique. ...

    It seems every boiler installation is unique. You will need to trace wires to find out which ones go to the thermostat and which to the transformer. Strange that you have one wire on the TH/TR...
  14. First your idea should work. You would need to...

    First your idea should work. You would need to reverse Y and W on the relay as W should come from the NO contacts since you will set the O/B to B (powered in heat mode).
    You may need a 3 pole relay...
  15. Yes, sorry. Y to G at the air handler.

    Yes, sorry. Y to G at the air handler.
  16. What you can do is re-purpose the green wire for...

    What you can do is re-purpose the green wire for a C. Move it from G to C at both the thermostat and air handler. Then put a jumper to connect Y and G at the air handler. You lose independent...
  17. With Nest verify you have a C wire connected. ...

    With Nest verify you have a C wire connected. You probably have a bad contactor in the outside unit.
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    Thermostats usually get power from the Rc so...

    Thermostats usually get power from the Rc so leave the jumper in.
  19. Your new thermostat is 24vac based. You need the...

    Your new thermostat is 24vac based. You need the line voltage version.
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    That is a digital dehumidistat which is not...

    That is a digital dehumidistat which is not compatible with Nest or other standard thermostats/dehumidistats. The control board of you system might have contacts for a standard two wire relay...
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    You could mount the old thermostat near the...

    You could mount the old thermostat near the controller and only use the TN4, R, and C wires. Then in parallel use R, C, W for the new wifi thermostat. A bit of a compromise as you couldn't control...
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    Honeywell t874r1442 with base Q674L1504. The X...

    Honeywell t874r1442 with base Q674L1504. The X in those is a common. Goes to C in most new thermostats. B goes to O/B terminal and gets configured as B-activate on heat. W2 is aux which goes to...
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    There are many ways to wire. Do you have a...

    There are many ways to wire. Do you have a humidistat? What wires changed with the new thermostat? If you put the old one back does the humidifier work?
    Where do the humidifier solenoid wires...
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    Follow the wires from the solenoid. Should be a...

    Follow the wires from the solenoid. Should be a humidistat and that should connect to the furnace which I don't see.
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    Yes, X on that thermostat base is the same as C...

    Yes, X on that thermostat base is the same as C on Nest.

    When asked tell Nest you have single fuel. The B wire goes to the O/B terminal and you need to tell Nest it is activated on heating.
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