intergas rapid control panel status, cold water tap on

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Mr Chibs

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Wonder if you guys can tell me if this is right/wrong.

I've recently had a 32kw rapid plus commissioned, all seems to be working well.
But I've noticed that when the cold tap/toilet is used, the boiler status number changes and you can hear the boiler internals working... (pump/igniter?)

The status light goes from 1, 3, 4, 5, 6 then finished on 5, this is within a 30 seconds.

I hadn't expected the above when using cold water, it's like the boiler is sensing the change in pressure.

tia
 
Is that any cold tap or just the cold tap next to the toilet ?

Maybe the plumber has connected the toilet and that cold tap to the hot water pipe instead of the cold water pipe.
 
It is indeed sensing a change in pressure - you need a single check valve fitting on the cold inlet to the boiler
 
I'll check the cold tap upstairs Cheers.

I'd only noticed this when changing the downstairs loo... the boiler is in same room.

I read that the intergas boilers are slightly different inside than most other boilers and wondered if this was normal
 
muggles said:
you need a single check valve fitting on the cold inlet to the boiler
Click to expand...

Is that a good idea ?

If a check valve was fitted then what provision would there be for the expansion of the water in the DHW coil in the heat exchanger when the boiler fires up for Central Heating ?
 
bernardgreen said:
Is that a good idea ?

If a check valve was fitted then what provision would there be for the expansion of the water in the DHW coil in the heat exchanger when the boiler fires up for Central Heating ?
Click to expand...
Not only is it a good idea, it is recommend by several boiler manufacturers. No provision for expansion is required, although a mini expansion vessel can of course be fitted if desired
 
If it's a new install and they took the hot water cylinder out there's probably some air trapped inthe old pipework. If you bleed it out the problem will go away.

It's quite straightforward @bernardgreen if there is air trapped it is compressed by the pressure from the incoming main when there is no demand. When a cold tap is run the pressure drops in the pipework and the air expands pushing water back through the flow turbine. Unlike earlier models that used an on/off switch the Hall effect sensor in the turbine doesn't realise it's going the wrong way and tried to fire the boiler.

Unusual to actually get as far as 6 though, usually it only gets as far as 3
 
Sort out the dodgy pipework..probably a redundant dead leg somewhere thats been capped off or...
you've got a length of pipe ready to feed a washing machine etc that has trapped air that needs bleeding out.
 
muggles said:
although a mini expansion vessel can of course be fitted if desired
Click to expand...

if desired, or if found necessary. Where in the pipe work would you fit it ? Before or after the flow sensor ?

Razor900 said:
the Hall effect sensor in the turbine doesn't realise it's going the wrong way and tried to fire the boiler.
Click to expand...

Maybe the control algorithm should be improved such that it counts more impulses from the sensor before deciding to fire up the boiler. Or fit a bi-phase sensor such the the control algorithm can determine the direct of flow through the sensor.
 
No Bernard. Best practice is to not leave long dead legs and bleed air from the lines.
 
bernardgreen said:
Maybe the control algorithm should be improved such that it counts more impulses from the sensor before deciding to fire up the boiler. Or fit a bi-phase sensor such the the control algorithm can determine the direct of flow through the sensor.
Click to expand...


Two points in response to that...

Firstly if the job was done properly and any deadlegs removed which they should be in accordance with the water regs the problem wouldn't exist.

And if the control algorithm was modified people just like your good self would be able to crow that it took even longer to get hot water from a combi.

And that's exactly your problem Bernie. I explained what was happening for you but you're too busy bring a dick to learn anything.
 
Razor900 said:
And that's exactly your problem Bernie. I explained what was happening for you but you're too busy bring a dick to learn anything.
Click to expand...

Calling a person who has a different opinion to your opinion does not make your opinion any more valid.

I had already realised that the boiler was responding to flow before you confirmed that was the cause,

Razor900 said:
to crow that it took even longer to get hot water from a combi.
Click to expand...

Counting a few more pulses would further delay the start of heating the hot water but the extra delay before firing would be short in comparison to the time it takes for heat to get through the heat exchanger from flame to water.

Razor900 said:
and any deadlegs removed which they should be in accordance with the water regs
Click to expand...

Muggles suggested maybe fitting a mini expansion vessel

In hydraulic terms a dead leg with trapped air is the same as an expansion vessel with trapped gas ( nitrogen or air ) except that the expansion vessel has a membrane separating water from gas.
 
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