Is there a programmable thermostat for a unit that has 1 ac unit and 2 thermostats?


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2005-09-26 15:18:54
2005-09-26 15:18:54

You need to be a bit more specific in your question. You state you have 1 AC system but 2 thermostats. What type of heating system do you have? Gas furnace, Boiler, Electric heat, Hot Water? Is your heating unit separate from your cooling unit?

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Improperly programmed programmable thermostat.

yes, if the ac unit has 2 zones, you will need a thermostat for each zone. if the ac unit provides both ac and heat, you can connect a thermostat for each. not a good way to go. better to use 1 therm in that case that has a heat-cool switch on it so the unit is not putting out both heat and ac at the same time.

can a faluty thermostat affect your central ac working?

I wanted to add some details: Currently I have two AC units on the roof that share returns and ducts, but are controlled by two thermostats separated by 2'. Can I run both units off the same thermostat? It seams no matter how I set the thermostats one unit ends up running more than the other. But maybe this is a good thing? Yes, you can operate both units from one thermostat. The best way would be to use a two stage thermostat. Then a relay will have to be installed in one of the units to separate the control transformers.

You obviously have a problem with your ac unit which cannot be dianosed here.

C to F Buy a programmable thermostat. Most decent ones allow you to toggle between C and F

The AC unit is fully controlled by the contactor. If the unit turns off by thermostat control such as setting tstat to off, the contactor is ok. The thermostat could be the problem though. yeah i understand that but when i say old unit i mean its so old that the thermostat only have two cables the red one and the white one! the auto and cont the unit has it in the indoor unit!!!

Absolutely. Use a small 'torpedo' level, place on the top of the thermostat to insure accuracy.

Your a/c unit uses different relays(switches) that are energized when the thermostat calls for A/C.

Need more specific information. Give more details. Is the outdoor unit running, is the indoor unit running, what type of thermostat, heatpump or straight AC.

No. You must keep a separate thermostat for each air conditioning unit even if the two thermostats have been physically installed side-by-side.The reason is very simple to understand: a thermostat is, very roughly, a bit like the cruise control in a car. When the speed drops from the set speed the cruise control gives the engine some more gas until it senses that the car's speed is fast enough and then it reduces the gas supply to the engine to maintain the set speed. No car engine can share the same cruise control with another engine. It is exactly the same for two air conditioning units - they each need to have their own thermostat.Now this particular question itself raises yet another question: Why has the installer placed both thermostats alongside each other? That is not good practice at all!The installer was either "cutting corners" - to save having to do some extra wiring for each separate thermostat - or was plain incompetent.To ensure that a particular air conditoner is controlled correctly its thermostat must be installed somewhere within the "zone of cooling" for that air conditioner.You should have been asked which areas you want to be controlled the closest. If you chose say the main bedroom for Zone A and the living room for Zone B, that is where the thermostats for each air conditioner should have been placed. But, as they have been installed side-by-side, if they are both set to the same temperature then the zone furthest away from the thermostats may never be cooled enough or may be over-cooled, whilst the zone closest to the thermostats may be controlled ok.To understand the reason why that would be true, let's consider what would result if each thermostat were set to a different temperature: it is obvious that the thermostat set to the cooler temperature will keep its ac unit running long after the thermostat set to the higher temperature has turned off its own ac unit.The resulting overall effect depends on which of the two zones is set to be cooler: * If the "set-to-be-cooler" zone is the zone closest to the position of the two thermostats then that zone will be controlled ok but the more distant "set-to-be-warmer" zone may never get any air conditioning!That more distant zone could just heat up to the temperature of the outside air because its "own" thermostat is telling it that the air around it (meaning the thermostat, not the ac unit!) is cool enough already...* If the "set-to-be-cooler" zone is the zone furthestfrom the position of the two thermostats then that zone will, again, never be controlled properly because the ac unit in the nearer "set-to-be-warmer" zone will always turn off its ac unit to maintain a temperature that is warmer than the other, more distant zone requires.So, again, that more distant zone will always get too much cooling because its "own" thermostat is telling it that the air around it (meaning the thermostat, not the ac unit!) is not warm enough yet!

An AC unit isn't supposed to heat! If you mean a heat pump, then you may have a relay switch problem. Or maybe, your thermostat is in the cooling mode. Contact a repairman.

No, it is better to replace your thermostat with a programmable one. You can typically save 10-15% on your bill by using a setback. It is an easy diy project.

The thermostat is located to the left of the headers right under the ac compressor. Generally all automotive thermostats are located near the where the large top hose connects to the engine.There is a housing that is usually connected to the engine with 2 or 3 bolts and this is where you will find the thermostat.

No. The refrigerator thermostat has different cut-in (when the unit turns on) and cut-out (when the unit shuts off) temperatures than a regular wall thermostat. A refrigerator thermostat cut-in/out values are usually 30 degrees - 35 degrees, respectively. If you used this on your wall, your AC unit would constantly be running trying to make your house a giant refrigerator!

If it totally dies, the AC unit will not operate. If it is "failing", the unit will not maintain the proper temperatures.

Either the thermostat is not set correctly or is ultra sensitive; or the unit is low on freon.

A central air conditioning unit will commonly turn on and off intermittently. To stop this, adjust the temperature on the thermostat or switch the unit either on or off rather than the automatic setting on the thermostat.

You can`t... There is normally no relay on the indoor unit that starts and stops the outdoor unit. The switching of the thermostat starts and stops the condensing unit, if it is not running, and the thermostat cooling contact is closed, the problem is outside.

You answered your own question correctly, use the progamammable thermostat, you will have less humidity to contend with and the unit will work less. the area you are trying too keep cool will be cool, the only time the unit will come on is when the temp goes above the set point that you have put in to maintain a cool temp.

That is the function of the thermostat. There are Auto and Manual changeover models made. Since you asked this question you must have an Auto changeover model.

A 24 volt heating only or a 24 volt heating/cooling (if you have ac on the unit)thermostat.

Furnace, Dryer, AC unit, stove, oven, or any other device that produce a temperature change that you regulate in some way.

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