Question about Goodman GMS90703BXA Heater

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Seems that furnace runs every 5-10 minutes

Thermostat anticipator is set correctly. Just seems the unit runs more than it should.

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Check air filter is clean also automatic fan control settings try that first

Posted on Jan 08, 2009

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WHAT SHOULD THE heat anticipator BE SET AT ON A MODEL COAT066BDA COLEMAN EVCON FURNACE


The typical starting point for heat anticipation is .4 amp. If you do not have a clamp-on ammeter, adjust it to .45 and observe operation for a few days. If not quite right and still short cycling slip it to .5. Then keep doing this until you are satisfied cycle time is correct.

If you have an amprobe or can borrow one, remove the stat and take a single loooooong thermostat wire. Attach it to the R or Rh and wrap it around the clamp on ammeter ten times then attach the other end to the W terminal. The furnace will initiate the heat cycle at that point. Observe the amp reading on the amprobe when full heat is on, DIVIDE that reading by ten (for the wraps of wire) and adjust the heat anticipator to THAT setting.

Feb 05, 2015 | Coleman Heaters

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How do I Set the Thermostat Anticipator


If you have an older thermostat that has a heat anticipator in it then there are some things that you need to know about setting it and what it actually does.

First the function of the heat anticipator is to fake the thermostat into feeling the room temperature as hotter than it really is. The heat anticipator is actually a variable output heater inside your thermostat. The amount of heat that it actually produces is very, very small. This heat does, however, make a difference in how the room temperature feels to your thermostat.

If no extra heat is made inside the thermostat it will not react quickly enough to shut off the heating source. This will make the room “overshoot” the set point of the thermostat.
By heating the thermostat up very slightly it then shuts down the furnace or heat source before it actually reaches the temperature set point. This will allow the left over heat to go into the room and raise the temperature to the set point by the time it is all used up.

If you are experiencing wild temperature swings or the room temperatures are either not getting to the set point or going over the set point then the heat anticipator either is not adjusted right or it is burnt out and not working at all.

There are a couple of different types of heat anticipators. They will usually look like one of these.

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If your heating is running too long then you will need to adjust the setting to a lower number. If you are not getting enough heat then go to a higher number. All you are changing when you do this is the amount of the heat coil you are using. Make small adjustments to the anticipator and then give it at least a half day before making more adjustments. Small changes can have a big effect if the heat anticipator is working correctly.

You also can set the anticipator by checking the current draw of the system. To do this you need to use an amp meter and measure the current draw of the heating unit when it is running. Then set the heat anticipator to the corresponding number of the current draw. This will at least get you a good starting point and some fine small adjustment can be made from there.

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For more advanced digital thermostats there are cycle change features that do what this heat anticipator does in older thermostats. These often incorporate many things in determining the cycle length of the heating. These thermostats will not have a heat anticipator setting.

Like many things when it comes to your comfort, all people feel things a bit differently. You need to make the changes to the thermostat so that YOU feel comfortable. There is no right way it has to be done. Make it work for you and adjust the thermostat so that you are the most comfortable!

http://www.fixya.com/support/r3892721-programmable_honeywell

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3584298-air_conditioning_programmable_thermostat

http://www.fixya.com/support/r3898732-lux_thermostat_500

on Jan 30, 2010 | Heaters

1 Answer

My furnace will not reach the desired house temperature in one cycle. It will run for several minutes, shut off, and repeat. It eventually reaches the desired temp but it take a long time and I feel it...


There are a few different reasons for short cycling of a furnace.
1. Inadequate air flow. Not enough air moving through the furnace can cause it to overheat and trip the high temperature limit switch.
check to see that all registers are open and returns are not blocked.
2 Improper heat anticipator setting on thermostat. Some thermostats have a heat anticipator and too low of a setting can cause short cycling.

4 Partially blocked drain hoses. If the condensate backs up into the furnace it can shut the flame off and then when the condensate drains the furnace starts again. Check all drain hoses to make sure they are clear.
These are just some of the possible reasons for short cycling .
Hope this helps.

Dec 26, 2013 | Heaters

1 Answer

I have installed a new Honeywell CT87 non-mercury manual thermostat. It runs but the the furnace turns off the room temperature alway at or beloe the furnace setting so the furnace turns back on again and...


Hi, these mechanical thermostats have what is called a heat antcipator on them. If you remove the cover you will see in increments or numbers such as 1.0, o.1, .2, .3, .4 or o.1, 2, 3, 4, . The stat and main gas valve work together and have to draw the same amount of amps to cycle the unit properly. This stat will have a copper arrow pointing at a number. A good place to start is to set it at .4. If the unit does not cycle right, set it at 1.0 and go from there until it cycles. Let it go through several full cycles during each time you adjust it until it is correct. These are good dependable stats as I have many on my service truck. If it doesn't take care of the problem, take it back and return it for one that is not faulty which happens often. Best of luck to you.
Ps, the small manual that comes with a new stat has that information on it, anticipator settings.
Shastalaker7
A/C, & Heating Contractor

Mar 11, 2011 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

One of the thermastat wires attaching to the williams heating on the wall became loose from the screw and didn't seem to be making little of no solid contact like a car battery might due. i tightened the...


If it touched a grounded metal surface, it is possible, leave the wires hooked up at the furnace, pull the thermostat off of the wall, disconnect the 2 thermostat wires, and then twist them together, the furnace should fire, if it does, then the thermostat is shot. Replace the thermostat, usually when there is a short, it burns out the heat anticipator on the thermostat.
Good Luck,
Paul Gibson

Apr 03, 2010 | Williams 1403622 Gas Compact Heater

1 Answer

HAVE A BRAND NEW GKS90904CX FURNACE. IT RECYCLES EVERY 2-3 MINUTES.WHAT WOULD MAKE THAT HAPPEN?


Hello
In the thermostat is a anticipator which controls the cycles.

Either the anticipator is set wrong or the thermostat is bad.

Feb 02, 2010 | Goodman Heaters

1 Answer

I have JANITROL GAS FURNACE that the MAIN LIMIT


First, replace the limit. What causes a furnace to cycle frequently would be either a malfunctioning thermostat, a shorted thermostat wire, a bad control or the thermostats heat anticipator is not set right.

Jan 30, 2010 | Heaters

4 Answers

Thermostat seems to be working, furnace does not always turn on


Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off

Jan 15, 2009 | Honeywell Electronic Programmable...

2 Answers

Lennox Gas Frunace fires goes out, fires goes out, fires goes out


Check your thermostat anticipator setting. If you dont know how to do this don't try on your own or you may damage your thermostat.

Dec 12, 2008 | Honeywell Electronic Programmable...

1 Answer

Room temp is not where it should be before furnace shuts down


Did the installer check the amperage at your thermostat and then adjust the heat anticipator? Or you may need to have the blower time settings changed to suite your needs. Get them back in to check.

Nov 10, 2008 | Heaters

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