Gledhill Boilermate & Alpha Pump

[baggy99]

I will shortly be installing a Gledhill Boilermate 2000 on an oil fired CH system with all TRVs.
Before buying the Gledhill I was intending installing a std cylinder and with this in mind I bought a Danfoss Alpha pump to cope with the TRVs.
Question - can I install the Alpha in place of the original CH pump fitted to the Gledhill, or do I need to get a bypass valve instead? I'd prefer to use the Alpha if poss, but I don't know if the variable speed will cock up the Gledhill's operation.
Any thoughts???

 

[ChrisR]

DOn't see whay not but check with Gledhill. Think you meant Grunfoss...

 

[baggy99]

>> Think you meant Grunfoss...

Doh - long day, time for bed I think...... Cheers.

 

[Paul Barker]

can't see a reason not to. Will just mention that the bm2000 control board goes belly up when a pump fails. Must be emf caused by catastrophy at pump. Can't see that Alpha should be any worse for this might live longer.

 

[baggy99]

Presumably the control board just switches the pump on/off? It doesn't try to be clever with proportional control?!

 

[Agile]

Paul should tell us exactly what goes wrong on the control board.

Most PCBs just switch on pumps using a relay!

Tony

 

[baggy99]

Update - I spoke to Gledhill earlier and they DON'T recommend fitting an alpha, but they couldn't really tell me why. So I am left wondering whether there is a good technical reason, or whether they just don't want you messing with something that could affect the warranty.....?