The Heating Season Begins…

As autumn progresses, daily temperatures begin to drop.  And so the heating season begins.  It’s that time of year when particular attention should be paid to making sure that your furnace is in good operating condition.  This means that the blower motor and burners should be thoroughly cleaned, old filters should be replaced, and the cyclic operation tested to make sure that everything works properly.  The cyclic operation is tested simply by turning up your thermostat to a temperature above the ambient where the burners should ignite and the blower motor should begin circulating air.  When the thermostat is turned down to a temperature below the ambient, the burners should turn off and the blower motor should also stop after a few minutes.  If you furnace is in a closet, make sure that anything stored in the closet that is combustible is removed and stored elsewhere or discarded.  If you will be using a gas logs unit, be sure that the burner and logs are free from dust and lint before using.  In addition, be sure that the unit is properly ventilated, your chimney damper is open or you have a window open to draw in air with a non-vented appliance.  Gas ranges are NOT intended to be used as heating appliances – please do not light all burners and keep it going indefinitely.  Carbon Monoxide can fill an enclosed room and become deadly.  Electric furnaces do not have this problem because they are not gas burning appliances.  However, heat can eventually cause wiring insulation to become brittle and short circuits can occur, leading to fires in homes and businesses.  When the heating demand is increased on boiler applications, pumps should be checked to make that water flow is not restricted and that all safety devices are operational.  Similarly, in geothermal applications water flow is critical in heat transfer between the heat source and the heat sink.  It is imperative that all piping, pumps and controls be inspected to assure proper operation and the prevention of loss due to fire.  Lastly, if you don’t know how to service your heating equipment, call a qualified service company!

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Fires and Appliance Safety

The weather has definitely gotten colder and heating systems are being put to the test. There are different kinds of systems; electric resistance, gas-fired forced air, hot water, and steam to name a few.  Regardless of the type of system, the potential for accidental fire is part of all heating systems.   During this time of year, it not uncommon for problems to develop which, when left unattended, can result in significant damage to homes and businesses.  For example, furnaces, both gas and electric, should be cleaned at least once per year; at the beginning of the heating season.  Some people think that just because they change their air filters every once-in-awhile maintenance is complete.  NOT SO!  Depending on the efficiency of the filter in use, some dust particles will pass through the filter media and accumulate on blower blades, motors, and heat exchanger surfaces.  The burning smell often detected when the furnace is first started is the result of dust accumulation.  If the furnace is never cleaned, dust accumulation can ignite and spread outside of ductwork.  Similarly, if the controls area is never cleaned, burners can become clogged resulting in poor combustion and sometimes, delayed ignition.  Delayed ignition of gas/air mixtures can become explosive and when ignited, can release a tremendous amount of heat with deadly force.  Poor combustion can also produce carbon monoxide which when inhaled can be deadly, especially to elderly people and young children with respiratory problems.  Similarly, electric heating systems such as heat pumps should be checked for proper operation as well as components that are in good working condition.  One of the biggest problems that should be guarded against is the wiring insulation that becomes brittle with age and cracks.  Exposure of conductors can result in short circuiting leading to a fire which can then spread to the structure.  Just because a circuit is protected with a circuit breaker doesn’t mean that a fire can never develop.  Circuit breakers are current limiting devices NOT thermal limiting devices.  Heat exchange coils, motor, fans, and blowers in heat pumps should also be kept clean.  Heat pumps come in different configurations such as air to air, air to water, and air to ground.  In the last two configurations, a fluid such as water or glycol is circulated to transfer heat to or from the heat pump.  In order to do so, a pump is used to circulate the fluid and must also be serviced at certain times.  Failure to do so can result in pump motor burnouts that could result in fire.  Remember, the pump and its motor are usually two separate components unless intentionally manufactured as a single unit.  Lastly, there is not much that can be done with hot and steam boilers except to make sure that the wiring is in good condition, stack temperature is not excessive, and piping is also in good condition.  Also, remember that piping can also be a source of ignition.  Hot piping can ignite combustibles if contact is maintained long enough.  Maintenance is the key to preventing fires in heating equipment.

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