What turns on the circulation pump


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Old 11-27-18, 09:25 PM
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Question What turns on the circulation pump

Hey everyone,
I am looking for some help figuring out my boiler circulation pump switch.
The circulation pump doesn't always turn on to circulate the hot water. There is a box on the inside of the boiler I am assuming is the switch that makes it come on. There is an electrical clicking sound (sometimes I can even see an electrical light) when the boiler is running. If I tap where it is making the sound the circulation pump comes on and circulates for a half day or sometimes more or less. So something going on here.

I have found a few things on Amazon and Ebay but nothing that looks just like this.

Can anyone help figure out what is this called and where I can purchase a new one?

(See attached pictures)
 
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Old 11-28-18, 06:51 AM
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A quick check is to short the yellow and black wire terminals with a metal screw driver. If pump starts it is the contacts above the white arrow.

Contacts can easily be cleaned with small file.

Relay can also be replaced. Get one with 24 Volt AC coil and contacts rated at 120 VAC, 3 amps or more. They are widely available.

https://www.allelectronics.com/item/...a-relay/1.html

https://www.allelectronics.com/item/...a-relay/1.html
 

Last edited by doughess; 11-28-18 at 07:10 AM.
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Old 11-28-18, 07:52 AM
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Thanks doughess! That makes sense. It seems like maybe the contacts were dirty and not connecting properly. I will take another look when I get home and see if the file does the trick.
Thanks
 
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Old 11-28-18, 11:19 AM
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If you choose to replace just the relay..... it must be a 24vAC coil. The relays Doug linked to are DC but they do offer AC versions of them.

I would highly recommend replacing the relay or control. Although cleaning the contacts may work now.... they will likely fail at the worst time.
 
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Old 12-02-18, 09:53 PM
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I cleaned the contacts with a file. Now its worse. The pump won't run very long now without a tap on the contacts. Then it kicks on.
I can not find an AC version of the relay. Any thoughts?
Thanks
 
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Old 12-02-18, 10:56 PM
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You can use ANY single pole 24vAC relay. They don't have to look the same as yours.

Here's several that will work.....
The 6AZU2 is widely available....... 6AZU2 at amazon
Another is the 90-290Q....... 90-290Q at home depot

There are many others. A single pole double throw 24vAC relay will also work.
Pick the relay you get and I'll tell you how to wire it.
 
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Old 12-03-18, 01:15 PM
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W,
Those contacts should never be cleaned with a file. They used to make a burnishing tool to clean them when these controls were prevalent back in the day. I don't know if they still make them today but if we didn't have one a dollar bill is the next best thing or if you are well off a hundred would do.
Maybe a little late but file it away for the future.

What is the number of your control. Maybe inside the cover or somewhere on the control.

You won't find anything that looks like yours. That's old school and most likely obsolete. They make replacement relays that do the same thing.

You have some info stamped where the white arrow is but cannot be read.
 
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Old 12-03-18, 02:07 PM
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My # 2 post suggested clean with file or replace. Relays should be replaced when contacts are badly burned.

Cleaning contacts has long been a widely used technique.

Before the current generation, disposable age, we old timers used files to clean contacts on automotive distributors points and generator control relays. People are still buying files to clean contacts.

https://www.napaonline.com/en/p/BK_7769143

https://ipatools.com/products/8047-d...lat-files.html
 

Last edited by doughess; 12-03-18 at 03:20 PM.
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Old 12-03-18, 02:42 PM
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Old 12-03-18, 02:54 PM
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Old 12-03-18, 02:56 PM
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Old 12-03-18, 08:23 PM
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Spott link Relay Contact Cleaning Burnishing
Link refers to "low current" applications, not power. Signal level switching is a different world, far more sensitive to contact issues.
 
 

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