2014년 1월 22일 수요일

About 'furnace blower fan'-HVAC Blower Motor?







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About 'furnace blower fan'-HVAC Blower Motor?








Furnace               and               central               air               conditioning               thermostats               generally               come               with               two               fan               settings.

One               setting               is               "auto."               This               causes               the               fan               to               be               turned               on               and               off               when               the               furnace               or               air               conditioner               has               heated               or               cooled               the               inside               of               the               unit               enough               for               the               air               to               be               distributed               throughout               the               dwelling.

The               second               setting               is               "on."               In               this               setting,               the               fan               will               run               continuously               regardless               of               what               is               going               on               with               the               heating               and               cooling               system.

Leaving               the               fan               in               the               "on"               position               all               of               the               time               can               produce               some               positive               and               some               negative               results.

Always               consult               the               owners               manual               of               your               unit               for               the               manufacturer's               suggestions.
               Some               furnaces               are               designed               to               do               more               than               just               heat               your               house.

They               have               built               in               systems               to               maintain               a               constant               humidity               in               the               home               regardless               of               whether               the               furnace               or               air               conditioner               is               running.

Some               of               these               units               also               contain               special               filtration               devices               to               remove               particulate               matter               and               allergens               from               the               air.

Leaving               these               fans               on               can               have               some               beneficial               effects.
               Filtering               devices               installed               in               the               central               heating               system               may               require               the               fan               to               run.
               If               you               have               a               special               filter               built               into               your               system,               it               may               be               wise               to               let               the               fan               run.

Although               it               will               use               some               additional               electricity,               the               benefit               of               the               filter               may               easily               outweigh               any               additional               cost.

The               same               is               true               with               a               humidifier/dehumidifier.

These               units               may               require               a               constant               flow               of               air               to               monitor               the               humidity               in               your               home               and               make               appropriate               adjustments.
               Some               argue               that               the               fan               will               last               longer               if               it               is               just               allowed               to               run               continuously               when               your               furnace               is               operating.
               The               idea               behind               this               argument               is               that               constantly               turning               the               fan               on               and               off               can               damage               the               coils               and               mechanical               parts               of               the               blower               motor.

By               letting               the               fan               run,               the               strain               of               starting               up               and               sitting               idle               will               be               eliminated.

Of               course,               you               do               run               the               risk               of               wearing               out               the               bushings               or               bearings               on               the               shaft               when               you               do               this.
               There               are               people               who               like               the               continuous               air               flow               in               their               home.
               When               the               air               is               in               motion,               it               gives               the               feeling               that               fresh               air               is               being               brought               into               the               home.

However,               this               is               not               usually               the               case.

Most               of               the               air               that               goes               through               your               furnace               is               recycled               through               your               cold               air               return               from               inside               your               house.

So,               although               it               can               be               a               little               refreshing               for               some               people               to               feel               the               breeze               the               fan               creates,               it               is               not               fresh               air.
               Letting               the               fan               blow               constantly               will               reduce               the               temperature               in               your               house               in               cold               weather.
               Unheated               moving               air               loses               heat.

This               is               why               a               fan               works               to               cool               your               room               in               the               summer.

When               your               furnace               fan               continues               to               run               after               your               furnace               has               cooled,               it               will               bring               a               flow               of               unheated               air               through               your               air               ducts.

In               many               cases,               these               ducts               run               through               the               attic               or               crawl               space               where               the               temperature               outside               of               the               duct               is               many               degrees               cooler               than               you               keep               the               inside               of               your               house.

Letting               the               fan               circulate               this               cooled               air               will               cost               you               more               on               your               heating               bill.

The               same               can               be               true               for               the               air               conditioner               in               the               summer.

In               fact,               during               the               summer,               the               fan               may               bring               moisture               back               into               your               home               from               the               water               collection               pan               below               your               cooling               coil               and               make               your               house               feel               warmer               due               to               increased               humidity.






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