Ideal logic 30 combi. HW issue

[townfanjon]

Have you tried a flowcup ash to see if its as per manufacturer flowrate .

 

[armyash]

So you have a solid red light on the hall sensor all of the time during hot water. Amd you have good flow from the tap ?
Have you taken the turbine out and cleaned it.
Also have you cleaned the flow regulator and filter ?

Both thermistors should be
At 60 degrees"ish 2500ohm
at 85 degreesish 1000ohm

If they are wildly different then replace.

And at 75% tap opening its gas rating fine. And with the hot tap wide open its still gas rating fine - no drop off ?

Only other thing is tap max flow is more than the boiler can heat

Thanks.

Yes solid red light.

Turbine has been cleaned, it's brand new.

Didn't do the regulator.

Where do you get the info to test the thermistors?

It was working a lot better last night when I finished and once the temperature was reached it was staying there. Unless on 100% flow.

 

[armyash]

what descaler did you use? only real strong acid gets rid of all the crap i.e sulphuric
sounds like the plate is just blocked

Hi I used fx2, I got some debris out but not a lot. It's a new plate.

 

[mfgs]

Have you tried a flowcup ash to see if its as per manufacturer flowrate .

This is the only way of determining whether the boiler is working as per the spec. The cold incoming water temp in the winter makes the hot water cooler. Check the manual for what temperature rise you should be getting at what flow rate, so like 11 l/min at 35 degree temp rise. The incoming main will be about 10 degrees roughly at this time of year so with a flow of 11l/min you should see a water temp of 45 degrees as an example.

 

[mfgs]

Have you tried a flowcup ash to see if its as per manufacturer flowrate .

This is the only way of determining whether the boiler is working as per the spec. The cold incoming water temp in the winter makes the hot water cooler. Check the manual for what temperature rise you should be getting at what flow rate, so like 11 l/min at 35 degree temp rise. The incoming main will be about 10 degrees roughly at this time of year so with a flow of 11l/min you should see a water temp of 45 degrees as an example.

 

[armyash]

This is the only way of determining whether the boiler is working as per the spec. The cold incoming water temp in the winter makes the hot water cooler. Check the manual for what temperature rise you should be getting at what flow rate, so like 11 l/min at 35 degree temp rise. The incoming main will be about 10 degrees roughly at this time of year so with a flow of 11l/min you should see a water temp of 45 degrees as an example.

I just had another look at the manual.


It says dhw flow rate is 12.4. If the flow rate is over this, it will affect the operation in hw mode?

Is this what you mean?

 

[mfgs]

Exactly, if the flow is higher then the temperature rise will be less resulting in lower temperature water. Manufacturers normally quote either a 35 or 40 degree temp rise.

Get your flow cup and digital thermometer out to confirm.

 

[mfgs]

Exactly, if the flow is higher then the temperature rise will be less resulting in lower temperature water. Manufacturers normally quote either a 35 or 40 degree temp rise.

Get your flow cup and digital thermometer out to confirm.

 

[armyash]

Exactly, if the flow is higher then the temperature rise will be less resulting in lower temperature water. Manufacturers normally quote either a 35 or 40 degree temp rise.

Get your flow cup and digital thermometer out to confirm.

Ok thanks that makes it easier to understand.

If the flow is too high for the boiler what is the best solution, would it be higher kW boiler or is there a cheaper, easier option.

 

[armyash]

Exactly, if the flow is higher then the temperature rise will be less resulting in lower temperature water. Manufacturers normally quote either a 35 or 40 degree temp rise.

Get your flow cup and digital thermometer out to confirm.

Ok thanks that makes it easier to understand.

If the flow is too high for the boiler what is the best solution, would it be higher kW boiler or is there a cheaper, easier option.

 

[newcastle phill]

Turn the cw inlet down til flow is reduced to what boiler can cope with. May increase water noise slightly

 

[mfgs]

As above, easiest way is to restrict the flow going into the boiler or alternatively just advise the customer on the limitations of their boiler. Understanding how it works will enable them to get water at the temperature they desire.

 

[armyash]

As above, easiest way is to restrict the flow going into the boiler or alternatively just advise the customer on the limitations of their boiler. Understanding how it works will enable them to get water at the temperature they desire.

I actually tried that last night, I also restricted the flow on the basin hot at the ISO but due to the noise I opened it up again. Thanks for the info.

 

[armyash]

As above, easiest way is to restrict the flow going into the boiler or alternatively just advise the customer on the limitations of their boiler. Understanding how it works will enable them to get water at the temperature they desire.

I actually tried that last night, I also restricted the flow on the basin hot at the ISO but due to the noise I opened it up again. Thanks for the info.

 

[armyash]

http://www.ukplumbersforums.co.uk/plumbing-forum/95568-hot-water-still-running-when-boiler.html

Having a nose at other threads and came across this one. Does anyone think this is similar to the issue I'm having?