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- Two Thermostats controlling 1 furnace - media-aid.com Community Forums
I added a new wire to extend from the R terminal and also left the original R wire connected.
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On the new digital programmable thermostat: I connected the R wire to the R terminal. I connected the G wire to the G terminal. When it calls for either heat or cool, the fan comes on as well. The G wire is not connected, so the switch that moves the fan from 'auto' to 'on' does not function.
The new thermostat controls the fan. If I put the thermostat in cool mode, the fan comes on when the set temperature is exceeded. If I put the thermostat in heat mode, the fan comes on when the temperature drops below the set temperature. I can also use the swtich to manually turn the fan on.
Glad I found your post. I had the exact same problem. Trying to parallel a second thermostat to turn on the furnace fan when the upstairs gets too hot from our wood stove.
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Thanks for the solution!! Should be able to combine them Best would be to get a zone control unit for several hundred dollars, so that the thermostats can never "fight" each other. 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 at the same time. It may be suggested to wire the heat-only T-stat to the green and red wires, to turn on just the fan when the T-stat calls for heat, but doing so will also turn on the AC through an oddity in how virtually all T-stats are made , probably not the desired effect.
Or at least should be able to As some pointed out Do this with the furnace fan or have a dedicated fan conceptually punched through the floor to the level above. These types of problems inwhich the temperature where the thermostat is located is not the temperature you want to control the HVAC system can sometimes be solved using a thermostat that has the ability to remote temperature sensor. Some will average the local thermostat sensor and the remote sensor, other thermostats will be controlled entirely by the remote thermostat. Flat list Threaded list.
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Two Thermostats controlling 1 furnace
Not no how, not no where! Probably paralleling will work with digital thermostats, but it's a little iffy. The best solution for your setup would be to get the system zoned. During the morning and evening the furnace run often enough to keep the floors balanced. William the Geezer, the sequel to Billy the Kid - Shoe.
I think matt has the answer to your problem - 2nd thermostat to control fan only in heat mode. Never underestimate the value of a sharp pencil or good light. Jazzy - did you solve this? Would you please explain what worked? The thermostat for my new Lennox 2 stage gas furnace is in their suite.
The furnace supplies heat to both suites and I have baseboard heaters to augment the heat in my suite. The issue I have is high gas bills and tenants who won't implement the night setback on their programmable thermostat. Everytime I am in their suite, I see that the night setback temp is only 1 degree below the daytime temp. Heat included in the rent. I want to place another programmable thermostat in my suite to override their thermostat at night time and during working hours. The thermostat is battery powered with 2 18 guage wires leading to the furnace.
What type of signal is sent to the furnace through those wires? I have access to the wall cavity. Can I wire a new thermostat in series or in parrallel? Find all posts by Handyman in Van. If you wire the two t-stats in series with one another should achieve what you are looking to do. Since a t-stat is nothing more than a switch that completes a circuit, sending 24 volts back to the board both t-stats will need to be calling for heat for the furnace to run. If their's is set for 75 and yours only 70, 70 it is. Find all posts by hankhill A two-stage furnace really should have a two-stage thermostat but it is possible that your furnace is actuating the second stage by means of an internal timer.
If the thermostat in the tenant's suite has only two wires then they should be colored red and white and connected to the R or RH or Rh terminal and the W or W1 terminal respectively. To have your own night setback thermostat you would have to cut the white lead and connect the ends to the R and W terminals in a new battery-operated thermostat.
Program this new thermostat with the times and setback temperature you desire but set the "home" temperature to a much higher than normal setting. The result will be the tenant's thermostat will control anytime the new your thermostat is in one of the "home" time periods and your thermostat will control during the "away" time periods as long as the tenant's do not turn down their thermostat below the setting of yours.
I want to warn you, subject to whatever landlord-tenant laws may be in effect in your area what you propose doing may be grounds for breaking the lease and possibly even legal action against you. Having a situation were heat is included in the property and yet removing control from the tenant is a dicey proposition. Find all posts by Furd.
I think that you can technically do what you want but I will also comment that in a rental situation what you want is not right. I think you need to find a solution that does not take away what you promised to provide.
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Find all posts by GregH. Something to toy with: Many models of motion detectors are available with a dry contact type output. Any of these sensors can be connected to the thermostat at the CK1 and CK2 terminals. Whenever the motion detector senses motion, the thermostat will be forced into Occupied mode.
Two Thermostats controlling 1 furnace - media-aid.com Community Forums
Just a thought, Could'nt you run the furnace blower on low while your heating with wood to help distribute the heat throughout the home? I have done that in my previous home and it worked quite well. Yes I have put the furnace on blower only, but it doesn't seem to push enough heat into the lower bedrooms when the kids go to bed. I think the problem is that the duct work cools down while the fire is burning so the fan just keeps the duct work warm.
I have thought about running it the entire time I have a fire burning to keep things more even, but I only need the heat downstairs right as the kids go to bed and a hour or so longer. I like the idea of the occupancy sensor. I will look into that. As I started to plan out the second thermostat I am realizing that the main thermostat is a two stage. So the question now is whether it is ok to have second thermostat single stage that is hooked up to the furnace ignoring the low stage.
Again this would only be a thermostat that would have control of the furnace during those nights when we have a fire.