« Return to Thread: Re: HAI RC-80 question
Re: HAI RC-80 question
by Marc MERLIN-7
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On Sun, Jun 21, 2009 at 03:39:08PM -0500, Joel Davidson wrote:
> > >Thanks a lot for your explanations on the thermostat. I ended up getting a
> > >couple and I'm working on setting up the second one.
> > >
> > >I had a question about that: my 2nd thermostat only needs to activate the
> > >furnace but does not need to send the 'fan' signal. I was hoping to reuse
> > >that 'fan' line separately from the heat/cool lines to trigger a booster fan
> > >in another room.
> > >
> > >Do you know if the RC-80 can be made to send heat/cool events without
> > >triggering the fan line, and whether I can then activate the fan line
> > >separately from heat and cool (saving me from buying a 3rd thermostat just
> > >for the booster fan control).
> >>
> >>Interesting question. Your best bet would be to contact HAI and ask
> >>them, or set up a thermostat and try it.
> >>
> >>My understanding of how my forced air hvac system works (and I may well
> >>be wrong), is that in heat mode the furnace controls the fan operation,
> >>as it lets the furnace heat up a bit before the fan comes on to prevent
> >>the system from blowing cold air. For a/c, the fan gets turned on when
> >>the system calls for a/c to prevent the evaporator coils from freezing
> >>up.
> >>
> >>I don't know if the fan line gets activated when the thermostat calls
> >>for heat though. If it doesn't then you could theoretically use the
> >>fan line as you want, as you can control fan mode via the serial i/f.
> >>
> >>If you can wait until late October, I can do a little testing here, but
> >>it's 100 degrees in Austin right now and there's no way I'm gonna turn
> >>on my heat!
> >
> >Understood, thanks for the info.
> >The install is going to be soon since I need it for boosting AC, so I guess
> >I'll see how it works.
>
> Let me know. I need to install a booster fan for my home theater, and
> haven't yet decided how to control it. Where did you get your booster
> fan?
I'm having an installer come over to put a $50 dual zone board for my
master/slave zone system. I could have done it with mh and the computer, but
the slave system is wired so that the RC-80 doesn't get any power at all,
even passively, so it turned out to be simpler to put a dual zone board.
The installer will look where my ducts are for the living room and what kind
of booster fan I need.
I case I can't use the RC-80 to control the fan, I may just get a manual
switch.
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems & security ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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On Sun, Jun 21, 2009 at 03:39:08PM -0500, Joel Davidson wrote:
> > >Thanks a lot for your explanations on the thermostat. I ended up getting a
> > >couple and I'm working on setting up the second one.
> > >
> > >I had a question about that: my 2nd thermostat only needs to activate the
> > >furnace but does not need to send the 'fan' signal. I was hoping to reuse
> > >that 'fan' line separately from the heat/cool lines to trigger a booster fan
> > >in another room.
> > >
> > >Do you know if the RC-80 can be made to send heat/cool events without
> > >triggering the fan line, and whether I can then activate the fan line
> > >separately from heat and cool (saving me from buying a 3rd thermostat just
> > >for the booster fan control).
> >>
> >>Interesting question. Your best bet would be to contact HAI and ask
> >>them, or set up a thermostat and try it.
> >>
> >>My understanding of how my forced air hvac system works (and I may well
> >>be wrong), is that in heat mode the furnace controls the fan operation,
> >>as it lets the furnace heat up a bit before the fan comes on to prevent
> >>the system from blowing cold air. For a/c, the fan gets turned on when
> >>the system calls for a/c to prevent the evaporator coils from freezing
> >>up.
> >>
> >>I don't know if the fan line gets activated when the thermostat calls
> >>for heat though. If it doesn't then you could theoretically use the
> >>fan line as you want, as you can control fan mode via the serial i/f.
> >>
> >>If you can wait until late October, I can do a little testing here, but
> >>it's 100 degrees in Austin right now and there's no way I'm gonna turn
> >>on my heat!
> >
> >Understood, thanks for the info.
> >The install is going to be soon since I need it for boosting AC, so I guess
> >I'll see how it works.
>
> Let me know. I need to install a booster fan for my home theater, and
> haven't yet decided how to control it. Where did you get your booster
> fan?
I'm having an installer come over to put a $50 dual zone board for my
master/slave zone system. I could have done it with mh and the computer, but
the slave system is wired so that the RC-80 doesn't get any power at all,
even passively, so it turned out to be simpler to put a dual zone board.
The installer will look where my ducts are for the living room and what kind
of booster fan I need.
I case I can't use the RC-80 to control the fan, I may just get a manual
switch.
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems & security ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
------------------------------------------------------------------------------
Are you an open source citizen? Join us for the Open Source Bridge conference!
Portland, OR, June 17-19. Two days of sessions, one day of unconference: $250.
Need another reason to go? 24-hour hacker lounge. Register today!
http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org
________________________________________________________
To unsubscribe from this list, go to: http://sourceforge.net/mail/?group_id=1365
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