Making sense of relays.

[Mike2007]

The cooker company gave me this as a substitute to the one fitted.

 

[Mike2007]

The "Rockwell" relay thats fitted seems very uncommon these days. I did find a very similar one that was £130 for one!
As posters were confused about the pins. They are spades in a grid formation.

 

[SUNRAY]

The cooker company gave me this as a substitute to the one fitted.

Have you verified that it is a problem with the relay, my experience with the sort of thing you are looking at points to other problems being more likely.

Unless you have already proved it to be the relay, I'd suggest initial testing: verify the fan spins correctly, then bypass the microswitch, I see the test link laying there to do this, apologies if you've already gone down this route.

The "Rockwell" relay thats fitted seems very uncommon these days. I did find a very similar one that was £130 for one!
As posters were confused about the pins. They are spades in a grid formation.

The original is actually RS badged one of these: https://www.ebay.co.uk/itm/20460210...MQvrhmiKKzamBA2WmvnY-3po7jsRYfjkaAu4UEALw_wcB
No longer listed but speaking with a colleague a 2002 paper catalogue confirms it is a 240Vac 6.6mA coil with 240Vac 10A contacts to this pinout: Different to Frodo's unusual suggestion

Terminals 1 and 2 are for the Normally Closed contacts (and are not used.)
Terminals 3 and 4 are for the Normally Open Contacts.
Terminals 5 and 6 are for the Commons.
Terminals 7 and 8 are for the Coil

It is still a 'standard' style and freely available, 4 options, all ready to plug straight in:

On Ebay now at £4

LY2N-J General Purpose Relay 12V - 24V DC/220V AC Coils - 10A DPCO/DPDT Contacts | eBay

LY2N-J General Purpose relay.

www.ebay.co.uk

Current version from RS: https://uk.rs-online.com/web/p/power-relays/4500330

Farnell: https://uk.farnell.com/multicomp/mc...G-PMAX-PrivateLabel-Test1596&gross_price=true

City electrics at £22.75: https://www.cef.co.uk/catalogue/products/1781287-8-pin-230v-ac-12a-2pole-mini-plug-in-relay-with-led

 

[SUNRAY]

So far as I have read - We don't know what the 'sensor' actually is. In the past, I have designed circuits, where a sensor's resistance varies, and is carefully matched to the resistance, and sensitivity of the relay coil. I wonder if this might be so designed?

I doubt that in this case as it's a 240Vac coil and energised from the fan supply and confirmed it's running by flow differential pressure switch.

 

[ebee]

The cooker company gave me this as a substitute to the one fitted.

Why did the company "Give you" this? Did they not charge for it? if not why not? Is it still under warranty?

 

[Mike2007]

Have you verified that it is a problem with the relay, my experience with the sort of thing you are looking at points to other problems being more likely.

Unless you have already proved it to be the relay, I'd suggest initial testing: verify the fan spins correctly, then bypass the microswitch, I see the test link laying there to do this, apologies if you've already gone down this route.




The original is actually RS badged one of these: https://www.ebay.co.uk/itm/20460210...MQvrhmiKKzamBA2WmvnY-3po7jsRYfjkaAu4UEALw_wcB
No longer listed but speaking with a colleague a 2002 paper catalogue confirms it is a 240Vac 6.6mA coil with 240Vac 10A contacts to this pinout: Different to Frodo's unusual suggestion

Terminals 1 and 2 are for the Normally Closed contacts (and are not used.)
Terminals 3 and 4 are for the Normally Open Contacts.
Terminals 5 and 6 are for the Commons.
Terminals 7 and 8 are for the Coil

It is still a 'standard' style and freely available, 4 options, all ready to plug straight in:

On Ebay now at £4

LY2N-J General Purpose Relay 12V - 24V DC/220V AC Coils - 10A DPCO/DPDT Contacts | eBay

LY2N-J General Purpose relay.

www.ebay.co.uk

Current version from RS: https://uk.rs-online.com/web/p/power-relays/4500330

Farnell: https://uk.farnell.com/multicomp/mc...G-PMAX-PrivateLabel-Test1596&gross_price=true

City electrics at £22.75: https://www.cef.co.uk/catalogue/products/1781287-8-pin-230v-ac-12a-2pole-mini-plug-in-relay-with-led

Will this swap out my relay without alterations?

 

[Mike2007]

Why did the company "Give you" this? Did they not charge for it? if not why not? Is it still under warranty?

Sorry, I meant to say they recommended it.

 

[Mike2007]

I doubt that in this case as it's a 240Vac coil and energised from the fan supply and confirmed it's running by flow differential pressure switch.

Correct, the pressure switch operates the coil to create a safety loop for the cooker gases.

 

[SUNRAY]

Will this swap out my relay without alterations?

Those 4 relays I provided links to are described as the same format as the one in your pictures, any of them should plug straight into the existing socket.

However excuse me for asking but have you proved it to be a relay fault?

The reason I ask again is the 'dropping out during service' you mention is more usually indicative of a fault elsewhere.

From post#6

However if the relay is dropping out during use, I'd suspect a blockage in the pressure switch and its associated pipework, a blockage in the flue/clogged fan impellor or motor, a failed diaphragm or microswitch. These are not in any specific order as all of those are common issues.

Of course there could also be a problem with whatever is operating the fan.

 

[JohnW2]

...The reason I ask again is the 'dropping out during service' you mention is more usually indicative of a fault elsewhere.

Indeed - and I would have thought that a relay 'dropping out during service' because of a fault in the relay would be a very unusual occurrence, wouldn't it?

 

[ebee]

Sorry, I meant to say they recommended it.

Is the cooker more than 6 years old?

 

[Mike2007]

Is the cooker more than 6 years old?

Yes, about 20 years old

 

[Mike2007]

Those 4 relays I provided links to are described as the same format as the one in your pictures, any of them should plug straight into the existing socket.

However excuse me for asking but have you proved it to be a relay fault?

The reason I ask again is the 'dropping out during service' you mention is more usually indicative of a fault elsewhere.

From post#6

When the pressure switch was "looped out" of service the intermittent problem continued. The relay, pressure switch and exhaust flue are housed outside. But once closed up, all electrical parts get quite warm there. All items are original, about 20 years old.

 

[ebee]

Is the cooker more than 6 years old?

It was worth asking because you could invoke warranty om "white goods" 6 years England and Wales and 5 Years in Scotland but 20 years is beyond that but I thought I`d ask.

 

[ebee]

When the pressure switch was "looped out" of service the intermittent problem continued. The relay, pressure switch and exhaust flue are housed outside. But once closed up, all electrical parts get quite warm there. All items are original, about 20 years old.

It is starting to sound like relay, base and connections issue so your relay comment may well be the answer right enough