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The following article was published in our article directory on November 28, 2011.
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Thermostats

Article Category: Home Management

Author Name: Yilitza Acosta

Heating and air conditioning systems use a wide variety of controls. Thermostats, aqua stats relays and timers are all basically on and off switches. This means that these mechanisms regulate when the unit is in operation and its temperature at certain times of the day and night.

Mechanical Thermostats

Thermostats come in two different forms. There are mechanical and electronic thermostats that are available to consumers. The mechanical design is based on the expansion rate of certain metals. By welding two, dissimilar pieces of flat metal together to create a bar, heat or cold will cause movement that, in turn, measures the temperature. Electronic thermostats are mainly used in residential areas and the mechanical are used in businesses. However, there are cases where both are used in other situations.

Some manufacturers put glass bulbs with liquid mercury and electrical contacts within the lever for more accurate temperature readings. These types are the most commonly used thermostats.

Mechanical thermostats need to be mounted correctly in order to provide readings that are on target. Dust and dirt can also interfere in the precision of the temperature display as well. This is why regular maintenance is very important when you own a HVAC unit.

Electronic Thermostats

Unlike mechanical thermostats, the electronic version is designed to be programmable. For this reason, the electronic thermostat allows for more energy efficiency and comfort within the home. To determine room temperature, these thermostats use a special sensor called a thermistor. This sensor is also able to switch the cooling on and off. If you listen closely enough, the thermostat will give a ticking sound when cutting on and off.

Not only do programmable thermostats offer more flexibility than their mechanical counterparts, this electronic version also combines convenience with energy conservation. Most companies will install these types of units when available. There is the option of programming the thermometer which permits users to lower the heated or cool air during more inactive hours.

Replacing a Thermostat

Before removing or replacing a thermostat, you need to look at the power supply. Most homes that have electric baseboard or wall cavity electric heat have thermometers that are fueled by line voltage. That's why the power must be turned off prior to any handling of the thermostat. It's possible that high voltage could exist and cause injury.

Central heating and air conditioning systems generally use low voltage thermostats. Although low voltage isn't a safety threat, there is still the potential to damage the thermostat or other controls when disconnecting. So it's important to turn the power off before the thermostat is removed. If you ever decide to perform system maintenance, it is always best to remember that all electricity to the unit is turned off.

Keywords: air conditioner, air conditioning system, heating systems, air conditioning and heating installations, air filters

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