User:Scrappalottaman

One of the best jobs that I have ever had was working as a sub contractor in the building trades.

The Heating and Cooling Cycle

In heating and cooling any space it all begins at the thermostat where a person must adjust the temperature by the switch to a higher number for heating or a lower number for cooling. If a person sets the thermostat at a higher temperature then an electrical signal produced inside of the thermostat by way of a coiled spring that makes contact with mercury sending the electricity on to turn an ignition switch which is also a coiled spring increasing the voltage and turning on a heating element within the furnace and heat will be produced and a moment later a fan will come on to push that heat out of the furnace and into duct work that goes throughout the place and the heat will then exit into the space through a vent and into the room and when the heat reaches the thermostat somewhere near the center of the room the thermostat will turn off the heating element and the fan at the furnace by disconnecting the mercury from the coiled spring. When the person sets the thermostat at a lower temperature then an electrical signal will be sent to a packaged unit above, below, inside or outside of the space to be cooled and make contact with a relay switch left in the open position closing it allowing a higher voltage to pass through and turn on a compressor, motor and fan all at the same time, after a moment a switch attached to the motor, compressor will then turn on a fan at the furnace and the coiled tubing inside of the furnace containing refrigeration delivered from the motor compressor will be warmed because it will absorb the moisture from the air passing over it and will cool the air that is being pushed by the furnace fan through the duct work and out of the same vent causing it to circulate throughout the room and when it reaches the thermostat the packaged unit will be turned off by the thermostat as the coiled spring will have relaxed and the mercury having moved away and this true in both heating and cooling cycles.