What do you tin-benders use when you need just one or two low-current relays to peform “logic” functions in a system — switch 24V control signals? I’m looking for something that doesn’t involve investing in sockets and a mounting box, just a lug-mount unit that you can connect to with screws or spade connectors.
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Replies
I have a Trane parts store nearby that should have 24v relays. It's new and I haven't been in it yet, but the previous Trane Supply house had 24v relays that I could buy, and you didn't need any kind of HVAC license to get them.
Another source is an well stocked electronics supply house. We have one downtown and they carry base and socket type relays, but they're fairly cheap.
This is a link to an on-line place that I've used, though haven't bought relays, yet. The link is for a relay type of which I have about a half dozen in my systems. They're pretty useful.
http://www.partsguy.com/cgi-bin/PartsGuy/L36947.html
Google '24 volt relay, HVAC' and check out the results.
"I am the master of my fate, I am the captain of my soul." Invictus, by Henley.
Yeah, I previously used a relay like the one you pointed to. It's basically a standard fan relay for AC control of a GFA furnace fan. It works fine but is overkill, is pretty loud when closing, and draws a heck of a lot of coil current.
If ignorance is bliss why aren't more people
happy?
Ouch$I am insterested in what you find. What I usually do is look to the "electronic side".Looking at Mouser I see;P&B K10 series for $8 (but dc coil).
Omron G4B $10
Omron MJM series $12These are all 10-15 amp contacts.In the 30 amp rangeP&B T92 series $9
P&B T9A series $3 (20 amp contacts, 2.8 watts coil, only DC coil)
Omron G8JN, G8W & TYCO VF4 these are all "automotive" so only available in 12 vdc.
Magnecraft Class 9A $4 only dc coil
Magnetcraft Class 92 $12 (ac coils - 4 va) $9 (dc coil, 1.7 watts)
Omron G7L $12 with QC terminals, $16 with screw terminals.
Yeah, I just found Mouser a little while ago via Google -- had never seen them before. Found one Omron that looked like a possibility, and now see that the P&B KUP-11A55-24 might be reasonable.It's irritating how poorly many of the web sites are organized. Mouser is better than most but only tolerable. Many will only let you search by part number. Others force you to page through 50 pages of stuff to find what you want.
If ignorance is bliss why aren't more people
happy?
Ya right when digging for gold you would think they would just put it on top of the rock pile, Just kidding.
What in out are you looking for ? did you check out johnstone on line? sometimes you can find it with a little digging.
The other big time electronics company for stuff like this is Digi-Key, at http://www.digikey.com/. Their online catalog is pretty easy to work with, plus they're right here in Minnesota.
Google for "Electronic Goldmine" or "All Electronics." Two very good surplus electronics outfits. Pretty well organized web pages. Most stuff is brand new.