British Gas / Ideal RD2 450 Sensor Layout

[Schmill]

Just after some opinions here.
I have recently opened the case on the boiler again due to (another) sensor failure.
By chance I happened to to see the 'layout' page in the manual, available here:
Ideal RD2 Manual - Section 12 - Page 15

My system is fully pumped, so table 6.
Access to the rear of the RH side of the boiler (when viewed from the front), is not possible, but I can see that there are no connections at the back of the boiler on the LH side (apart from a drain tap) - which in turn I think places me at row 3 of the table.

That would say that the sensors (at the front) should be in the following positions;

'Flow' sensor should be TOP RH
'Return' Sensor should be BOTTOM RH
'Overheat' should be BOTTOM LH

However, below is a picture of my boiler;

RD2 450 Sensor Positions

• Schmill
• 25 Apr 2012
• 1

O/H Sensor in wrong location?

To me it looks like the Overheat is in the wrong location, being TOP LH (with the thin copper 'pipe' from it).

Now my boiler has always been like this as far as I know, but is it wrong / right? Should it be corrected? If so am I able to do it (ie. 'allowed') - I presume it is a drain fo the system, remove the fittings and refit in the correct location with PTFE tape or similar to seal?

Or am I missing something somewhere and it's fine as is?

NOTE I've never (yet) had an overheat condition, and my thinking is that with it at the top it would perhaps trigger earlier than it is supposed to, which it hasn't done? (but I could be wrong thinking this too!)

Thanks!

 

[Agile]

From boiler design principles I would expect the OH stat to be at the top left.

Tony

 

[Schmill]

Cheers Tony, I would agree, it certainly seems to make sense (even to me as a layman) to be in that top left position, but that also seems to be at odds as to what the manual says... perhaps the manual is wrong?
It would seem strange to me to have the O/H sensor effectively directly above the combustion chamber (which it would be if it was in either bottom pocket).

 

[Agile]

Not for that reason though!

Hot water rises but more relevant is that when correctly connected the return is at the bottom and the flow at the top and the water is pumped in that direction.

Tony

 

[Schmill]

Ahhh I see