Replacing Thermostat

The main function of the thermostat is to switch the heating system on and off as and when required. It works by sensing the air temperature and switches on the heating system when the temperature falls below the level that is set in the thermostat and again switching it off when the temperature again reaches that level. Mechanical thermostats work on the principle of thermal expansion. The two most common types of mechanical thermostat include the bimetallic strips and the gas filled bellows. As these strips expands and contracts on receiving heat, the electrical circuit breaks and the heat flow stops.

Thus, it is quite clear that thermostats are very important to control the room temperature with respect to central heat, air conditioning or the furnaces at home without air. However, it is true that thermostats are quite reliable objects but sometimes even they might go wrong and then repair or replacement is the only solution. When your heating or cooling system fails to bring into the room the desired temperature the chances are high that the thermostat has stopped working. During such scenarios you might try out some of the DIY methods before calling in an HVAC expert.

For example, you can set the thermostat five degrees higher or lower than the normal setting depending on the season. For instance, during the heating season you can set the temperature five degrees higher than the normal setting and during winter you can set it five degrees lower.

It is important that you check whether the thermostat is properly set to heating or cooling mode based on the requirement. If not you need to adjust it accordingly. You should also find out whether the batteries of the thermostat are worn out or not, if that is the case you need to replace them.

Now let us have a look at the steps that might be involvement in the thermostat replacement of a furnace or an air conditioner.

First of all, you need to start by shutting off the power to the heating or the cooling system. This will help you in protecting the HVAC unit.

Secondly, if you are replacing a mechanical unit, you can remove the cover or the unit to get to the wire connections. In some of the units, you can do so by loosening two or three tiny screws while some of the units will have to be removed from the wall to have access to the wires and in case of the digital units they will just snap off the mounting base.

An important step in thermostat replacement is to write down the terminals and the color of the wire. However, the thermostat replacement continues by mounting the new base on the wall. Last but not the least, you will have to check the functionality of the new thermostat by setting the power back to the heating or the cooling system. In case, even after following all these steps your thermostat does not start functioning you need to get in touch with an HVAC technician for better diagnosis.



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