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Honeywell thermostat for (heat/AC pump) #T874G1246 Temperature levers for heat and cool are only adjustable in tandem, ie: can not adjust them independently.

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Your heat pump can only do one thing at a time. its either cooling, heating or off. you have no need to adjust set points individually.

Posted on Dec 10, 2008

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How do i adjust AC temperature variance on a Honeywell TH5220D1003 thermostat


If you are talking about the difference between heating mode and cooling mode and the room setpoint, you can not change it. It comes from the factory with a 3 degree difference. In other words if you raise the heat setpoint until it is within 3 degrees of the cooling setpoint, for every degree you raise the heat setpoint the cooling will raise a degree.
About all you can do is increase the distance between the heat and cooling setpoint. To do this either lower the cooling setpoint to 3 degrees higher than the heat setpoint you want and then increase the cooling setpoint the desired setting. For example heat and cool setpoints are 67 and 70 respectively, and you want 65 and 73. Lower the cooling setpoint to 68 and then raise the cooling setpoint to 73. Now your heating will come on 3 degress lower than 68, the 65 you wanted and cooling will come on at 73. Remember, the thermostat new setpoints will turn on the cooling at 75 and turn back off at 73 and heat will turn on at 63 and turn off at 65.
You can perform the same using the heating setpoint, just have to look at it backwards. If you need to lower the difference I recommend a 8000 series thermostat. They are the most functional thermostat that Honeywell makes, be in mind they are about 3 times more expensive and many of the setting require a well trained tech to interpret and set properly.
Hope this helps.

Aug 24, 2014 | Honeywell Th5220d1003 Non-programmable...

Tip

Honeywell th8110u1003


The Honeywell TH8110U1003 thermostat is a universal programmable thermostat that gives you electronic control of 24V AC heating and cooling systems. It also has the capability to be used on 750mV heating systems


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One of the best features of this thermostat is it’s big clear backlit display. The current temperature, the set temperature and the date/time of day are displayed at all times. Simply touching the screen also activates the back light feature.

This digital thermostat has a menu programming guide the helps you through the process of setting up your schedule. You are able to select multiple days and customize the thermostat for any kind of unique schedule you may have. This thermostat also let’s you take it off the wall and still be able to program it. This lets you watch TV and program it at the same time.

There are built in backups that will hold the time for you if the power goes out. This t-stat will also update for daylight savings time. There are HOLD features that allow you to modify your program and hold it and then go back to the original.

Change reminders that are built in include the air filter, UV light, humidifier service and of course the batteries of the thermostat. The blower of you furnace can also be programmed to run extra to help increase the air quality in your home.

If you decide you want to know the outdoor temperature you can purchase an additional sensor and then hook it to you thermostat. The outdoor temperature will then be displayed on you thermostat. This feature also gives you the capability of using the sensor to monitor indoor temperatures remotely.

This thermostat will keep you very comfortable as the variation typically in temperature from set point is less than 1 degree F. The thermostat after a period of time learns the characterizes of the way the house or building heats and cools and then adjusts to get the most efficient operation of the heating or cooling system while maintaining a very close temperature tolerance.

By changing a few of the parameters in the thermostat this can be can be configured for either single stage conventional heat/cool systems or any single stage heat pump system.

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

http://www.fixya.com/support/r3869033-replacing_thermostat

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

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

on Jan 17, 2010 | Heating & Cooling

1 Answer

Aux keeps coming on on regular heat is there something wrong with heat


See if it happens only when your temperature of the room is more than 3 degrees of your setpoint temperature. Since you have a heat pump, the auxiliary (electric heat strips) is use for backup of the heat pump when it can't keep up. The heat pump will run by itself if it can maintain temperature within a couple degrees. If it is too cold outside to handle the load or you set the temperature more than 2 degrees past room temperature, the auxiliary will turn on. The thermostat has a memory of how long it takes to reach desired temperature. If it goes into auxiliary mode trying to satisfy setpoint during the last call for heat, it will start the next call for heat in both aux & heat pump mode until the thermostats algorithm (timed program) allows only the heat pump to run. Not sure if you have an air to air, or geothermal heat pump. The outside air temperature will affect only the air to air system ie. when the temps drop outside, the heat coming out of your vents will be cooler...the air to air systems drops efficiency when the outdoor air drops.

Nov 08, 2013 | Honeywell TH3210D1004 PRO 3000...

1 Answer

Dear Sir,I have an Amana Distinction 2.0 Ton heat pump, SEER 14 installed in my department about 4 months ago. I've noticed that the AC has a regular pattern running in the on/off cycle and that i


You need a tech. All 14 seer units have an X13 motor which speeds up and down on start up. A tech will adjust your tstat programing. Fan stays on after unit is done cooling to help drain water in cooling and cool off heat strips in heating,

Jun 15, 2013 | Heating & Cooling

1 Answer

My air conditioning will not turn on. The thermostat control has only four buttons,two adjusting the temp up or down,one turns the fan on or on auto and the other selects the system cool heat or off. When...


After setting the unit to cool and adjusting the temperature, the compressor should run if the light stops flashing. Check the condenser, if the fan and compressor does not run, check the contactor if it is energized or pulled in. If the contactor is not pulled in there must be no power or the holding coil is open. If the condenser fan is running without the compressor, check your compressor, high pressure switch, and capacitor.

Sep 09, 2011 | Honeywell Heating & Cooling

1 Answer

RTH2510B thermostat Honeywell How do we adjust the temperature to cool it down. We are in Florida and it is 89 in the house. How can we set it easily for 70 all day and night?


Hi, You should be able to just push the down arrow button...

Here is a tip that tells you how to get a manual for most any Honeywell productonline...

Manual Honeywell How to Find Honeywell Manuals

heatman101

Jul 24, 2011 | Honeywell Heating & Cooling

1 Answer

How do I set my thermostat so that it doesn't keep going off and leaving me with no hot water .I have a Honeywell digital thermostat.


The problem is not your thermostat. It is the person who told you that your AC would be your sole source of hot water. The purpose of heat recovery is to ASSIST with hot water production and reduce the current used by your water heater. The only time your AC heats your water is when it is working to cool (or if it's a heat pump, cool and heat) your home. Turn your water heater back on and let your AC help keep the water hot. It's not supposed to do it alone.

Mar 19, 2011 | Honeywell Heating & Cooling

1 Answer

How do I change the temperature range on a Honeywell TH8110u1003 thermostat. The range now won't let me go below 77 in AC mode.


Try adjusting the heat range up. Set it a 77 then try the cool.
I believe the Honeywells have a max range between cool and heat.
also sometimes there is a lock out code on them you'll need the book.
Good luck

May 20, 2008 | Honeywell Heating & Cooling

1 Answer

The Honeywell Programmable Heat Pump Thermostat CT3611R is not adjusting the temperature to a cool setting. Cool air is coming out of the vents however the temperature on the thermostat remains the same...


if your problem has existed since the begining of installment it could be a return/ thermostat placement problem. if the return is to close to any supply vents it will run like that and your thhermostat will read like that

Apr 24, 2008 | Heating & Cooling

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