Tring to understand the wiring in a 30 yr old, tri-level (split), house
recently moved into.
Kinda rough, without any wiring diagrams, schematics, etc.
Old owner gone.
Would like to ask the following two questions, please:
a. House uses a forced hot air gas furnace for heating.
Not at all familiar with forced hot air, as I've always had ahot water
heating system, with individually controlled zones.
Was surprised to see a thermostat in the downstairs level, and one in the
level that apparently control the hot air furnace. Would think that they
would "fight" each other
I thought with hot air furnaces, you would "always" just have a single
thermostat, and balance out the heat flow by adjusting the heat outlets in
the individual rooms, etc.
(there are No electrically controlled gates/flappers in the ducts to make it
into a two zone system)
How common is it to have two thermostats controlling a hot air furnace, I
guess in parallel ?
Good idea ?
b. A split air conditioning system was added about 20 years ago.
Condenser outside, and an evaporator section in the attic, or at least this
is what I think is there.
Attic really tough to explore due to low height.
Haven't tried the A/C out yet.
But, did investigate a noise, and discovered it was coming from a blower in
the attic, most likely part of the A/C system up there.
Found a 110 V switch in the attic that turns it on/off. Thought that this
would be for the serviceman to turn power off, not for the homeowner's
everyday use, of course.
But I cannot find, anywhere, a thermostat that controls this blower. Just
the attic 110 V switch.
Was wondering if anyone might have any ideas on this.
What might this blower be used for ?
Would they use the blower is a reverse direction, likely, to work as an
exhast fan ? If so, where could it possibly be exhasting to, assuming it's
primary purpose is to blow cool air from the evaporator into the ceiling of
the rooms below it.
Why no thermostat or other control for in the house proper ?
Any thoughts ?