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 upstairs 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 ?