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  2. HVAC Troubleshooting: Common complaints and how to ... - AOL

    www.aol.com/news/2008-03-26-hvac-troubleshooting...

    With the way we take a home's heating and cooling systems for granted, it s easy to think that because you press a button and air flows, everything's working as it should. In reality, this couldn ...

  3. Trace heating - Wikipedia

    en.wikipedia.org/wiki/Trace_heating

    Trace heating may be used to protect pipes from freezing, to maintain a constant flow temperature in hot water systems, or to maintain process temperatures for piping that must transport substances that solidify at ambient temperatures. Electric trace heating cables are an alternative to steam trace heating where steam is unavailable or ...

  4. Condition monitoring of transformers - Wikipedia

    en.wikipedia.org/wiki/Condition_monitoring_of...

    Condition monitoring of transformers in electrical engineering is the process of acquiring and processing data related to various parameters of transformers to determine their state of quality and predict their failure. This is done by observing the deviation of the transformer parameters from their expected values.

  5. Dissolved gas analysis - Wikipedia

    en.wikipedia.org/wiki/Dissolved_gas_analysis

    An oil sample tube is used to draw, retain and transport the sample of transformer oil in the same condition as it is inside a transformer with all fault gases dissolved in it. It is a gas tight borosilicate glass tube of capacity 150 ml or 250 ml, having two airtight Teflon valves on both the ends.

  6. Electrical fault - Wikipedia

    en.wikipedia.org/wiki/Electrical_fault

    In a high resistance grounded distribution system, a feeder may develop a fault to ground but the system continues in operation. The faulted, but energized, feeder can be found with a ring-type current transformer collecting all the phase wires of the circuit; only the circuit containing a fault to ground will show a net unbalanced current. To ...

  7. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

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