On the Vision Pro professional series (i.e. TH8110, etc.) backlight
selection (continuous or key-press only) is installer option 0280. My
supposition is that this option is not available on the retail version.
At the risk of not being taken seriously..... the answer is:
Such as auto changeover, the backlighting which you've already
discovered, the need for batteries (optional on the trade versions), the
lack of multistage capability for 3-heat, 2-cool systems, an optional
humidity controller, and more that I can't recall at the moment.
Well, I bought the RTH8500, hoping that I could get it to use my heat
pump if at all possible, instead of the electric toaster. I know its
got some kind of learning algorithm, but I have no idea what it does or
how it works.
Basically I want to turn off the heat pump at say 10pm, then have it
come on at around 4am so its nice and warm by 7am, without using the
toasters. I'm not sure it will do this if it turns on in the morning
and its 60 degrees instead of my desired 74. I assume it will just turn
on the electric resistance coils (toasters).
Any insight welcomed!
Over time (8 days or so) the RTH8500 will learn when to turn on the HP
in order to raise the setpoint temperature to 74 degrees at the time you
want it. Assuming your HP is above the balance point, it will raise the
setpoint a degree at a time so as to avoid heating the toaster elements.
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