Ravenheat 820/20 thermocouple question..

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Maybe a stupid question but...
When replacing a Ravenheat Thermocouple with an attached sensor on the flow pipe, does this just attach to the surface of the pipe or is a boiler airlock job.
 
I would love to help you but I dont understand your question.

The 820 thermocouple is a special type which interfaces with an overheat stat connection before the wire is attached to the gas valve. The connections are just 6 mm spade tags from memory.

Tony
 
Tony..
The thermocouple looks like a normal one except about half way down the length is a plastic T piece and out of one side of this T two pieces of wire go down and connect either side of a metal disc that is held onto the pipe by a small metal collar with 2 screws. I have just examined it and as there is no form of rubber washer, I think this must just sit on the surface of the pipe. Would that be right ?
 
Looking at a thermouple it's certainly going to be dry - maybe some heat sink compound.
 
Thanks Chris..
I was going a bit from memory, but I have since got it from my van and had a proper look.
You are right it must be a dry job as there is no way that the collar would ever hold back any water.
Thanks mate.
 

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