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2. Is It Time for a Furnace Upgrade? 10 Warning Signs to ... - AOL

   www.aol.com/time-furnace-upgrade-10-warning...

   Depending on the problem and the age of the furnace, it may be more cost-effective to invest in a replacement furnace instead of making expensive repairs to an old system. 10. Visible Signs of ...

3. Pilot light - Wikipedia

   en.wikipedia.org/wiki/Pilot_light

   Flame rectification occurs when electrons flow through the flame burning, which the ignition controller senses and knows the flame is there, keeping the gas valve open. If the appliance loses gas or the flame goes out, the ignition controller does not see the flame, closing the gas valve. A red-hot surface can also be used to provide ignition.

4. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   At the furnace, cool air passes into the furnace, usually through an air filter, through the blower, then through the heat exchanger of the furnace, whence it is blown throughout the building. One major advantage of this type of system is that it also enables easy installation of central air conditioning , simply by adding a cooling coil at the ...

5. Crankcase heater - Wikipedia

   en.wikipedia.org/wiki/Crankcase_heater

   A crankcase heater is an electrical component in a compressor in an air-conditioning system, heat pump system, or chiller system. The crankcase heater is normally on all the time, even when the unit is not running, though temperature sensors and set points may turn it off when not needed.

6. Freeze stat - Wikipedia

   en.wikipedia.org/wiki/Freeze_stat

   In practical situations, when an air coil freeze stat is not used, bypassed, or defeated, the air coil can freeze, and this causes a lack of air flow to the facility. [3] By contrast, when a water coil freeze stat is not used, the water coil can get so cold that it can freeze the cooling liquid in the exchanger and burst the exchanger. [ 5 ]

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