Ideal logic 30 combi. HW issue

[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?

 

[armyash]

Update. Cust happy, now all working.

Thanks for the replies.

 

[mfgs]

So what was it?

 

[armyash]

Debris build up in the plate.

Cust said now all working fine, I told them to let me know if it changes and I'd have another look.