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Two Thermostats Furnace Hook Up One

How to Wire a Thermostat for a Furnace and AC Unit!

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But you can, with mechanical thermostats, wire a heat-only T-stat "in parallel" with a combo T-stat. Connect the white and red wires from the combo T-stat to the heat-only one. But you must be careful to never set the combo T-stat to cool while the other one is turned up, or you'll have the heat and cooling on. 3 Mar Nest allows for two usage scenarios in this situation: one, using multiple Nest Thermostats within a single home, and two, using a Nest Thermostat with a non- Nest Thermostat. .. This will turn on the furnace bringing the temp back up to 21 C on the main floor and make the basement temp rise a bit more. You could probably wire two up, but as tester mentioned, it won't really help with your problem. What you probably want is one thermostat with multiple thermometers (one built in to the thermostat, and one remote). Usually the temperature is averaged across both thermometers, so while not perfect.

Posted By RobinJoeMar 4, at 6: Our thermostat is in the hall, halfway between the livingroom with our wood-burning stove and our Master Bedroom. We have central forced hot air with a gas furnace, and central airconditioning. Is there a simple way to add a second thermostat source the bedroom in parallel with the thermostat in the hall?

If the basement thermostat calls for heat, the heat will be delivered to the whole house. This is just he kind of problems I love to work on. I am attempting to wire a smart switch to replace the switch. If nothing else I've either given you some ideas or turned you off on the whole idea. Does that make sense?

Or will they interefere with each other? We would like the heat to kick on if either thermostat drops below 69 degrees. I could also install some sort of switch near the hall thermostat to switch between the two, but would like to avoid that if possible. It requires a double-throw switch to allow one or the other thermostat to control: I see you haven't received any responses.

I'm confused - what are you trying to control with the second thermostat? There is an easy way to add a second thermostat if you are looking to add another device that needs control. But I can't quite tell what it is you're trying to do here I suppose you could do just that If either stat closed, it would close the circuit and the heat come on.

Then once both stats were above the set point, the heat would go off. Northeastern MA Hook Up Two Thermostats One Furnace Lowell. I agree with Gooserider. You could cause problems. You might need to isolate the 2 thermostats from each other. What kind of thermostat do you have currently?

I'm always confused, FWIW, but don't all of the low-voltage hot wires generate from the same source, and all the neutrals return to the same point?

What diff does it make if two Tstats' hot wires meet at the relay?

Switch is not resetting. Thank you for your interest in this question. Do all digital programmable thermostats behave that way? I think I understand, both thermostats run on batteries so I think I am ok from wiring perspective.

Nothing will happen, since they already "met" at the source, right? I don't see a problem. I'm not sure off hand either - I'm not sure just what they use for output circuitry in those thermostats, but I DO know that the instructions on several that I've looked at SAY don't attempt to fire off the furnace by shorting the thermostat leads at the burner Which is a fairly standard trick used by many burner techs, and which is fine on something controlled by one of those old round Honeywell mercury stats.

I do know that I've had electronic stats that have failed to work right after that was done. Putting two stats on the same contacts is going to be doing effectively the same as jumping the contacts for the one that doesn't turn on first Some day, when I grow up, I am going to learn more Off to the click at this page. BTW, if I remember, those instructions about not hot jumping are generic, and somewhat archaic, too.

This induced a magnetic resonance in the capillary thermisters, that, if it became harmonic, would cause them to explode, like the original crankshafts on the experimental 3-cylinder Mercedes engine many years ago that is why it never came into mass production.

Hook Up Two Thermostats One Furnace

It was not a pretty site, and too many boiler techs lost fingers. That is a good point, goose - It may be they are worried about some type of inductive kickback from throwing a screwdriver across the terminals at the motor and the resulting surge when you break the contact.

Though, 'technically' that's not what you're doing with the two stats. But it's always better to be safe than sorry!

How the 2 stage thermostat works

Well, I read instructions of how to build a tool to do it and they suggested not to simply short the two pins, but to put a small resistor in series with the pins for a particular reason. I'm no EE or physics major but maybe this is what the purpose was for Could something similar be designed for 2 t-stats on one zone? If these click on DC current it would be relatively easy to isolate each thermostat using a diode.

However, I believe they operate on volt AC. I'm thinking a dual-coil relay might be a solution but I"m going to ask some guys as work for other ideas.

Hook Up Two Thermostats One Furnace

I'm thinking now Hook Up Two Thermostats One Furnace with a few diodes and a relay this may be relatively easy except for the fact that you may need to control the compressor, fan, and gas burner separately. If you just needed to control one of those you could use 2 diodes and a relay as shown the attached drawing. BTW, since you're working with AC there is no positive or negative 24 volts as I've shown but it helps to think of it that way when you're wiring it up.

The diodes isolate each thermostat from seeing the other one and also rectify the AC to DC. Relays don't really care whether you're using AC or DC to trip source the addition of a capacitor is needed for AC operation.

The contacts in the relay serve the same role as the contacts in the original thermostat. I'm just not sure how to address the three different things you need to control. This would require buying a 2nd thermostat. The thermistor is the semiconductor temperature sensing device that most electronic thermostats use.

You could then place the 2nd thermistor in the bedroom so that the original thermostat would essentially sense the higher, lower, or combination of the temps in both rooms. This may be the easiest solution.

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Again, I'll talk to the guys sat work for a sanity check. This is just he kind of problems I love to work on.

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I'll be lying awake tonight thinking about this one. If nothing else I've either given you some ideas or turned you off on the whole idea. You must log in or sign up to post here. Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: