Is it possible to "range rate" an Ideal Icos HE15?

[BertGlaedvine]

I am the proud owner of an Ideal Icos HE15 that is 17 years old and somehow still functioning.

I know that this boiler cannot modulate down very well, but I have got it working reasonably well and have spent a decent amount of time getting the pump speed sorted & balancing the heating system.

The problem I have is on boiler start-up once the system is already hot.

The boiler runs as normal and modulates as low as it can before cycling once the return temps rise. When the return temps fall it ignites again but the boiler appears to start in a full-power mode and does not modulate down fast enough. This means that the flow temps rise rapidly and the boiler cycles again.

I would like to be able to reduce the maximum output of the boiler, so that when it fires it does so at a reduced power-output so that the modulation has chance to kick in properly.

I've read about "range rating" for other (more modern) boilers, and would like to know if this is possible with my boiler.

Any help or advice greatly appreciated!

 

[cross thread]

No range rating ,just modulates on temperature

 

[BertGlaedvine]

@cross thread thank you for the reply - that's a shame but I thought that might be the case