"ROBERT SAYRE" wrote to "MIKE ROSS" (25 Dec 02  14:15:00)
 --- on the topic of "Furnace fan?"

 RS> I wonder if it would be better to monitor the
 RS> air temp being taken from the room and comparing
 RS> that to the air temp blowing out into the room.

The idea is to compare what energy is going up the chimney with what is
being extracted from the exchanger. Say for example, if there is a lot
more oil burning than is needed to heat up the house, that extra heat
goes up the chimney. However, there are certain limits such as a flue
temperature of at least 400'F minimum otherwise the chimney will corrode
or worse form tarry creosote deposits which as you know are a potential
fire hazard. Also, as was mentioned before, if there is a lot of air
blowing into a room but with a comparatively lower temperature than
before it makes it seem like the room is colder (windchill effect?).

 Mike
 ****

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