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Blower On Delay dantheman 10-16-2006
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Posted by dantheman on October 18, 2006, 8:46 am

Noon-Air wrote:
> 1) Call a *competent* tech

Great. Can you direct me to the book with the "Competent Tech"
listings in my area? I'm having trouble finding that directory...

Peace, Dan


Real Goods Solar, Inc.
Posted by troytheboy on October 16, 2006, 9:10 pm
ya can't get there from here.

Troy
> My Carrier 58MCA furnace has a 66sec Blower On delay. The problem is
> that I have to have the fan running constantly to assist the HRV
> Ventilator feeding the return duct. When the Blower Fan stops for
> "warm up", the ventilator is blowing out the unfiltered return ducts,
> sending dust and crap into the air.
>
> Can I switch off the Blower On Delay? What if the blower is running
> off of a FanHandler (so it's quite slow during normal Fan On)? Would
> disabling the Delay impede the warm-up of the heat exchanger enough to
> cause a severe performance problem?
>
> How can the Blower On Delay be modified? After studying the wiring
> diagrams, it seems that the feature is not field adjustable.
>
> Peace, Dan
>



Posted by James on October 17, 2006, 9:21 pm
It's a timer circuit on the board and it's not adjustable. You could alter
it but it would be a pain. You won't find a schematic for it either. I'd
probably try to use the low voltage side of the fan relay to control a relay
at the ventilator so that it get's turned off when the furnace blower is
off.

> My Carrier 58MCA furnace has a 66sec Blower On delay. The problem is
> that I have to have the fan running constantly to assist the HRV
> Ventilator feeding the return duct. When the Blower Fan stops for
> "warm up", the ventilator is blowing out the unfiltered return ducts,
> sending dust and crap into the air.
>
> Can I switch off the Blower On Delay? What if the blower is running
> off of a FanHandler (so it's quite slow during normal Fan On)? Would
> disabling the Delay impede the warm-up of the heat exchanger enough to
> cause a severe performance problem?
>
> How can the Blower On Delay be modified? After studying the wiring
> diagrams, it seems that the feature is not field adjustable.
>
> Peace, Dan
>



Posted by dantheman on October 18, 2006, 8:44 am

James wrote:
> probably try to use the low voltage side of the fan relay to control a relay
> at the ventilator so that it get's turned off when the furnace blower is
> off.

James, you sound like a superhero... willing to help the weak... do you
think shutting the ventilator each time would wear it out faster? When
you power it down, some flaps inside close and of course, the motor
doesn't sound like it likes to power up much when it does so(obviously
designed to run continuous). Any experience with these Venmar HRV 2500
units?

Peace, Dan







>
> > My Carrier 58MCA furnace has a 66sec Blower On delay. The problem is
> > that I have to have the fan running constantly to assist the HRV
> > Ventilator feeding the return duct. When the Blower Fan stops for
> > "warm up", the ventilator is blowing out the unfiltered return ducts,
> > sending dust and crap into the air.
> >
> > Can I switch off the Blower On Delay? What if the blower is running
> > off of a FanHandler (so it's quite slow during normal Fan On)? Would
> > disabling the Delay impede the warm-up of the heat exchanger enough to
> > cause a severe performance problem?
> >
> > How can the Blower On Delay be modified? After studying the wiring
> > diagrams, it seems that the feature is not field adjustable.
> >
> > Peace, Dan
> >


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