Okay, the red button is a manual reset that is the heat enchanger gets to hot it opens the safety cicruit. The new one does not have the red button so therefore it will automatically reset itself once the temperature of the heat exchanger cools down. Once you install the new one verify the control shuts the unit down. The easiest way for you to do this is to cover the return grilles with a plastic bag with a little tape to hold it to the grille. Then start the heat cycle and observe the furnace operations. There should be a little tab near the 200 degree temp. once it gets to the 12 oclock point the burners should shut down. If it shuts down properly pull plastic bags off returns and satisfy tstat. now turn heat on again and observe what temp the blower comes on
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The terminals on the old stat should be basically the same as on the new stat...with a couple exceptions anyway. Note the color of wire on each terminal before removing them and reconnect to the new stat on the same terminals. 8 wires typically indicate a heat pump, so in the configuration menu you'll have to tell it whether to energize the O terminal in cool or not. If you have individual wires on Rc and Rh terminals, you must remove the factory jumper between those two terminals on the new stat. If not, you'll burn out one of the two control transformers or possibly damage your new stat.
In the configuration menu, you'll have to tell it whether its a gas furnace or electric furnace, select the way the fan operates and possibly limit the cycles per hour on both heat and cool modes. There's a lot of subtle entries that need to be done to 'tailor' the new stat to your likings also.
I think it would be best to rely on someone thats a bit familiar with HVAC to change out your stat for you..... as once it is changed, all possible functions of the stat need to be verified as correct in operation.
Hi, these Honeywell combination fan/limit controls are used for turning the fan on after the combustion changer reaches the factory setting on the round dial that you see when you remove the cover. The high limit will turn the fan on when it reaches this temperature, and off when the stat is satisfied. If the blower motor fails due to a burn out or short, it shuts the main burners down on the high limit setting. These controls can be removed and you can clean the probe which has a set of contacts at the end. Sometimes this will fix the problem. Check the settings on the dial to see if they are set right to come on, the time it takes between cycles, and the temperature they are set to shut off. This sounds as though you need to check your thermostats also. They could be a problem. You say electric heat, but then you are saying flames? If these limits have the manual fan button, make sure they are on auto. Long delays could also mean you have a dirty flame sensor located by the pilot. You can clean the metal tip with steel wool or fine sanding cloth. Short heating cycles may be your thermostats like I said before. You shouldn't have to replace the fan/limits as I told you what they control. These will cause a fan to run and not shut off after the stat is done, so check to see if they are dirty. Please keep me posted. Shastalaker7 A/C, & Heating Contractor
if it is the fan that wont cut off, make sure the manual over ride button,(white push/pull) is in the auto position.if the burner will not cut off then the spring on the control is failing and the control should be replaced.control can be found online or at most heating supply companies.
If the jumper has been removed, then the control is working in the low voltage circuit. Black should be 120v in, White the 120 going out to the fan, and the red or limit wire is (should be) in the low voltage control circuit. Have you looked at the wiring diagram for the F and L Control? If not I will provide a link for you. https://customer.honeywell.com/techlit/pdf/69-0000s/69-0117.pdf
Your original wiring configuration seems to indicate that you have an air conditioner (not heat pump) and either a gas or electric furnace. If this is the case you may need a different thermostat for your application.
should be installed with
1) red to rc and jumpered to rh
2) green to g
3) yellow or blue to y
4) white to w
to test: remove t-stat connect white and red - furnace should operate normally unitil you disconnect.
if it does replace t-stat
That is an old style t-stat i would replace it with a more up to date model. Your problem may be in the limit switch. But yes to answer your question most fans can be adjusted just depends on if it has a manual limit that looks like a silver box on the interior of your furnace or if it has a mother board control system.
The fan limit switch is basically like a thermostat.When the plenum heats up to a certain degree it turns on the fan to start heating your house, and turns off when the fan off when the plenum gets around 80-90 degrees so that you’re not pumping cold air in to house. It also acts as a safety switch if the fan does not come on the plenum will get way to hot so this fan limit will kick the furnace off before that happens. As far as that little white button it should always be on auto you can try to use needle nose pliers to get it back into the auto position, or if you have the broken piece you can try to glue it back on. The white button goes in and out it does not turn or anything just make sure you turn the power off first and if u can’t fix it replace.