Help replacing Rheem relay 42-18287-12 6 terminals but replacements have 8
#1
Member
Thread Starter
Help replacing Rheem relay 42-18287-12 6 terminals but replacements have 8
My Rheem / Essex relay part # 42-18287-12 is clicking and not always turning the blower on to my furnace.I am finding replacement parts online, but they all seem to have 8 or 10 terminals. I'm not sure how to hook it up.
I've attached a photo of my current relay.
Looks like an easy do it yourself fix, but confused with the additional terminals.
Help! Thanks
I've attached a photo of my current relay.
Looks like an easy do it yourself fix, but confused with the additional terminals.
Help! Thanks
Last edited by PJmax; 12-03-19 at 09:59 PM. Reason: resized picture and added labeled one
#2
Member
The relay pictured is just a double pole single throw relay. You shouldn’t need a part number. It’s just a generic part.
I’m guessing the one you saw was a double pole double throw, which is still fine to use.
The wiring schematic is molded into the plastic cover, you can see your C/NO/NC contacts.
Are you certain the relay is faulty? When it drops out what is the coil voltage?
I’m guessing the one you saw was a double pole double throw, which is still fine to use.
The wiring schematic is molded into the plastic cover, you can see your C/NO/NC contacts.
Are you certain the relay is faulty? When it drops out what is the coil voltage?
iggy16
voted this post useful.
#3
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes
on
39 Posts
If you get a relay with terminals at locations 2 & 5, just cover them with fully insulated connectors. Otherwise, the wiring should be the same.
iggy16
voted this post useful.
iggy16
voted this post useful.
#5
Member
Verify the replacement relay's coil draw (amps) is equal to or less than the relay being replaced, otherwise you could exceed the circuits power supply rating.I am assuming both relay coils are 24 vac rated.
iggy16
voted this post useful.
#6
Member
Thread Starter
Thank you, but still have questions. I'm an idiot with electrical, but trying to save money after my daughters wedding
roughneck77 I think it is faulty because it will be humming and the unit doesn't click on. I push the relay and it works. I have no way to measure the coil voltage
PJmax Thanks for labeling
beelzebob How do I check the amps? Should it be on the label with the part?
Here are 2 relays I'm looking at:
Rheem Ruud 42-18287-12 Blower Control Relay 90340
Replacement Rheem Ruud 42-18287-12 Blower Control Relay 90340
roughneck77 I think it is faulty because it will be humming and the unit doesn't click on. I push the relay and it works. I have no way to measure the coil voltage
PJmax Thanks for labeling
beelzebob How do I check the amps? Should it be on the label with the part?
Here are 2 relays I'm looking at:
Rheem Ruud 42-18287-12 Blower Control Relay 90340
Replacement Rheem Ruud 42-18287-12 Blower Control Relay 90340
#7
Either one will work. They are identical electrically however the first link is an actual Ruud part.
Costs a little more. Would be the better quality choice.
On a 24vAC relay..... there is really no concern on coil draw.
Costs a little more. Would be the better quality choice.
On a 24vAC relay..... there is really no concern on coil draw.
iggy16
voted this post useful.
#8
Member
Just be aware the power source of the circuit has a volt amp rating (limit) and a replacement relay's coil can have a higher current requirement. If the coil current is not listed on the relay or its packaging, the relay manufacturer is the source of the information.
iggy16
voted this post useful.
#9
Member
Thread Starter
So as long as the new relay is 24v 50/60HZ like it says on the original relay, I am good to go? And put insulated connectors on the 2 pins not used in the middle?
#10
Member
Yes, any 24V double pole NO relay will work in that application.
You don’t really have to cover the unused spades unless they are contacting something.
You don’t really have to cover the unused spades unless they are contacting something.
iggy16
voted this post useful.
#11
Member
Thread Starter
Here is the side to the relay. So it's safe to order the Rheem replacement and connect? Thanks everyone for the help!
Last edited by PJmax; 12-12-19 at 08:14 PM. Reason: resized picture
iggy16
voted this post useful.
iggy16
voted this post useful.
#16
Member
Thread Starter
So I got the relay, but wasn't the one in the picture. This has 10 connectors while the pic had 8 and all I need is 6. Should I send it back? Help! Thanks!
Last edited by PJmax; 12-28-19 at 03:34 PM. Reason: reoriented/resized pictures
#17
It's the same as we've spoken about. Hold the two relays next to each other !!
You don't use the two terminals with the red X's.
The two terminals in the blue box are the same......pick one !
The two terminals in the purple box are the same..... pick one !
Years ago they made a different relay for every application. It's too expensive to stock all those different types. One relay replaces may different old configurations.
You don't use the two terminals with the red X's.
The two terminals in the blue box are the same......pick one !
The two terminals in the purple box are the same..... pick one !
Years ago they made a different relay for every application. It's too expensive to stock all those different types. One relay replaces may different old configurations.
#18
Member
Thread Starter
Great, sounds good! I can leave the unused terminals exposed?
Thank you very much for the help!
Thank you very much for the help!