I realize that this is a "DIY" question, but I couldn't find any other place to ask this, that seemed to fit.
I'm interested in creating a home brew zoned heating/air conditioning system, but I can't seem to find any information anywhere about the heating/cooling system in my house.
I've just got two basic questions that I can't seem to find ANYHWHERE on the internet, and would really appreciate someone's help.
1) My unit isn't designed for a zoned hvac, I don't think it has to be, right? (I intend on putting in a barometric pressure relief bypass duct, as well as the dampers required, these parts I understand and can do without any problems.) I'm mostly trying to understand what the wires coming from the control unit inside the HVAC unit do. The wires are marked with, "R", "C", "Y", "G", "W". My thermostat's manual (that was previously on the unit) says:
C: Optional, this will allow thermostat to pull power from HVAC unit, if not connected thermostat will use battery power.
R: Heat Power
Y: Cool / Comp
If I'm correct the following wires perform the following functions, (Please verify!),
C: This is the power leg (getting that information from the manual, I assume it means that it's the common, but I'm not sure, it says, "if connected the thermostat will draw power from the c wire"), I'm not familiar with this one. Is it 24VAC, or the common for the 24VAC?
R: Heat, I'm not understanding why there is two heats. (After re-reading the thermostat manual, I suspect this wire is the incoming 24VAC to connect to the W terminal for heating and to connect to the Y terminal for cooling.)
W: Heat leg. Connect 24VAC to this leg when you want the unit to heat.
Y: Cool leg. Connect 24VAC to this leg when you want the unit to cool.
G: Fan, connect 24VAC to this leg when you want the fan to run.
Also, if the W wire has 24VAC, the Y wire shouldn't have 24VAC, and should be "floating" (Nothing connected), is this correct, (of course oposite for cooling, Y at 24VAC, W at floating)?
Also, I assume it would be bad for the unit to have the follwing situation: Outside temp is around 100F, inside is at 72F, temp rises to 73F, system turns on, cools down to 72F. This would mean the system is turning on and off very frequently, right? So, should the system be designed to say cool until 70F, then turn off, then wait till it becomes 75F before turning on? Or does the HVAC unit deal with this sort of thing, and setup delays on it's own?
Second situation which would be a problem (I think), Outside temp is 100F, high noon. Inside temp is 72F, Temp rises, HVAC unit cools, .... night time comes, Thermostat switches to heat if temp falls below 70F, is this a problem for the unit? IE, Can the unit switch between heat/cool on a per day basis or should this be reserved for a per season basis? The reason I ask is becuase on every thermostat I've ever seen, this is a physical switch, NOT electronic, even though the thermostat is electronic.
Is there ever any time in which you might want the W or Y to be 24VAC and NOT the fan? I realize that there is a possibilty that you'd want the fan on only, no heating/cooling. I assume this would damage the unit, but I'm not sure.
MUCH Thanx in advance!