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    Your old thermostat was wired as a heat pump...

    Your old thermostat was wired as a heat pump (wire on O is the indicator). Some of those thermostats weren't smart enough so needed the Y to W jumper to properly drive the heat pump. Nest does not...
  2. The pictures explain things. The Taco SR501...

    The pictures explain things. The Taco SR501 relay box appears to only be used to trigger the boiler and pump so doesn’t figure in directly for a thermostat C. That SR501 would be fed from the green...
  3. First off, those are Taco zone valves. You need...

    First off, those are Taco zone valves. You need to follow the wires as they likely connect to a zone controller (usually green box) where the wires to the thermostats are connected along with a...
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    Sorry but no solution here. What you are asking...

    Sorry but no solution here. What you are asking about is proprietary and not documented so only Trane people can answer. Try going to https://www.hvac-talk.com/ and post that you need answers and...
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    You plan looks good. Assume you re-using the...

    You plan looks good.

    Assume you re-using the old transformer for the HZ311's R and C "power" connections. Keep them isolated from the "equipment" connections.

    From your description blue and...
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    You didn't ask a question? Comments: Damper...

    You didn't ask a question?

    Comments:
    Damper wiring should connect to M1 and M4 on new panel.
    AC connection to generator is either to not run it at all while on generator power or to not run it...
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    1. Correct, the thermostats select heat/cool/fan...

    1. Correct, the thermostats select heat/cool/fan so you don't need a master switch.
    2. The zone controller doesn't control a humidifier. Normally you connect the humidifier to the main thermostat...
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    You shouldn't need to run wires to the outside...

    You shouldn't need to run wires to the outside unit as the control board will still use 1,2 to communicate with it. So just need to wire from there to the thermostat - 7 wires (you left out G).
    ...
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    You lose status messages but they are of little...

    You lose status messages but they are of little use. If you wire up W2 and Y2 then you get the benefit of two speeds at least.
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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...
  12. 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...
  16. 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 ...
  17. 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...
  18. 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...
  19. 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...
  22. 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...
  23. 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...
  24. Yes, sorry. Y to G at the air handler.

    Yes, sorry. Y to G at the air handler.
  25. 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...
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