I have a rental house where the renters tore off old t-stat, purchased a Hunter heat only T-stat to install. The problem is, it only has two wires for T-stat. One is red which has 24V and one blue. Question is, there are 3 other wires that has been snip off, to check for volts on red wire I had to go to snip white to read volts on red, there are no volts on blue, which I think is the heat or fan, not sure. Can a gas furnace and T-stat run on two wires only? or do I need another wire to complete circuit. It's a Hunter model #40020 T-stat. Thanks for any HELP....Sam
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This past week I changed out an old hot air furnace in a rental unit that made me question why the tenant did not go to the owner and offer to pay more rent in exchange for getting the furnace changed out sooner. If you are a renter that is paying the gas bill, then you need to think about this.
The hot air furnace was at least 60 years old. It had been coal fired furnace that was converted to gas many decades ago. The pilot light of this beast was more of a torch than a pilot light. When the thermostat called for heat the flame roared for 15 minutes before the exterior blower unit that was added when the furnace was converted to gas, started up to move air through the furnace and into the house.
As I was starting up the new unit, which took up less than 1/3 of the space of the old beast, the renter came and sat down on the basement steps looking on in amazement. How would that little thing make enough heat for the house? A few minutes later those questions were put to rest very quickly.
After starting the new furnace and burning off the oil that always smokes up the house a bit on a new startup the new little unit had the house warm as toast and was shutting down. Wow, that took less time than the old beast took to just warm up!
The renter related to me how that the old furnace cost over one hundred dollars a month just to run the pilot over the summer months. The wintertime heating bills were many times higher than that. The difference between the bills of the old unit and the bills that will be coming now will be unbelievable. A savings of 40-50% is not at all out of the question.
Now, if you are renting and are paying the bill to feed an old monster of a heating system, I suggest that you make a proposal to your landlord. Offer to pay a bit more rent in exchange for a new heating system. Not only will you decrease your gas bills enough to pay some extra rent and still come out ahead, but you will have the peace of mind that you have a safer heating system under the roof that you also live under.
It sounds like a standard gas fired heating system and electric cooling. Leave the jumper between the RC and RH and attach the red wire.to one of them it does not matter since they are jumped. Attach green to G attach the white to W attach the yellow to Y if there is no C screw on the new thermostat leave the blue wire disconnected and not touching anything. It is the common and many systems use feedback to provide the common power. The O & B terminals are used for heat-pump systems only. Their purpose is for the reversing valve. Depending on the make or model either the O or B is used not both but remember the O & B are for heat-pumps only not gas fired furnaces. NOTE the best wiring practice is strip the wire with your thumb nail not wire strippers they tend to leave nicks in the wire and will break in the future also wrap the wire around the screw in a clockwise direction it will pull the wire into the connection tightly if you wrap the wire counterclockwise it will push the wire away from the connection. Good luck. I assume the new thermostat is digital. If it is not digital the heat anticipator must be set. If that is the case let me know and I'll give you instructions on how to set it.
The Red and White wires coming from the furnace are the only ones that call for heat. the Green wire turns on the fan continuously, the yellow is for AC. If you have another wire color, it may be a Common wire and should not be used if your t-Stat has batteries. If no batteries, it goes to the C screw.
Depending on where the wires were connected on the old thermostat, would be the best place to start, but if that is not an option you could try to trace the wires back to your furnace and see where they connect to. It appears you have either an oil fired furnace, or a single stage heat pump. If you need more assistance please just provide type of heat used. Hope this helps
well i don't know you live but i live in iowa and the here you still will need a furnace because your air to air heat pump is only good to about 20 deg. that is where i have mine set any colder out side and i cant pick up enough heat from the outside to heat my house. but what i did was just put the heat pump on my old furnace so it will run on the heatpump till the temp get to cold then goes to the gas furnace this way you should cut cost down by using the old furnace for the blower and just replace the indoor coil and the condenser outside. they have t-stats now that will do all the brain work for the heat pump (switching heat sources) also you might try to find someone who installs goodman i have installed quiet a few of them and they are a good value for the price
On the back of most t-stats is a dip switch that is marked E or G that is changes the stat to work with either Electric heat or Gas heat just make sure you set it for the appropriate type of heat source your house has. Usually when we speak of Furnaces we are talking about gas, if that is so just change the switch to G. Good luck
Here is a link that will have wiring diagram it is for a similar model hunter. Also check your dip switch on the back of the stat to ensure it is set for gas (HG) or electric heat (HE) depending on your type of unit. Good Luck. Rule of thumb for most four wire systems is RED (power to stat) Yellow (Cooling) Green (Fan) White (heat)