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Subject Author Date
TPDT blower relay Gary 07-13-2008
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Posted by Gary on July 13, 2008, 4:01 pm
I'm looking for a TPDT relay with 24 volt coil rated for at least 6 amps
preferably more. I'll be using it on a 3/4 h.p blower motor & I'd like to
at least have the rated relay amps double the actual running amps.
So far all I can find is the small glass relays but the amp ratings aren't
high enough. I could put two DPDT in parallel if I had to but I'd rather
not. Anyone have any ideas?

Posted by Noon-Air on July 13, 2008, 5:09 pm

> I'm looking for a TPDT relay with 24 volt coil rated for at least 6 amps
> preferably more. I'll be using it on a 3/4 h.p blower motor & I'd like to
> at least have the rated relay amps double the actual running amps.
> So far all I can find is the small glass relays but the amp ratings aren't
> high enough. I could put two DPDT in parallel if I had to but I'd rather
> not. Anyone have any ideas?

Yeah... use a simple SPST fan relay to control a 3 pole contactor....or is
that too simple??


Posted by on July 13, 2008, 5:12 pm
wrote:

>
>> I'm looking for a TPDT relay with 24 volt coil rated for at least 6 amps
>> preferably more. I'll be using it on a 3/4 h.p blower motor & I'd like to
>> at least have the rated relay amps double the actual running amps.
>> So far all I can find is the small glass relays but the amp ratings aren't
>> high enough. I could put two DPDT in parallel if I had to but I'd rather
>> not. Anyone have any ideas?
>
>Yeah... use a simple SPST fan relay to control a 3 pole contactor....or is
>that too simple??

        Depends what he needs the other side of the throw for.


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Posted by Gary on July 13, 2008, 6:42 pm
> Yeah... use a simple SPST fan relay to control a 3 pole contactor....or is
> that too simple??

No that wouldn't work.
What I'm doing is designing a relay system for a three zone system
with a three speed blower motor that will call for a different speed
depending on how many zones are in use.
1 zone - low
2 - zones - med.
3 - zones - high

Here is my diagram.
http://www.oldnewtimer.com/zone_three_speed.jpg

I have to use t-stats where the fan gets energized whenever
there is a call for heat or cool. If anyone sees any discrepencies let me
know. I haven't tried it out yet but will in a couple weeks.

Posted by Gary on July 13, 2008, 6:31 pm
> Gee that was hard...
>
> http://www.grainger.com/Grainger/categories/electrical/relays/relays

Thanks, you'd be surprised I couldn't find anything like it in all the
supply houses around. All their glass relays were 3 amps or less.

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