Diverter Valve Operation

[Dunbar]

Trying to find out exactly what happens when my system boiler is called to supply the radiators and hot water cylinder at the same time.

For example today, whilst the boiler was on heating the water, the room stat triggered the boiler to supply the rads. The diverter valve installed in the airing cupboard with the pump and cylinder, is set to auto.

It sounds reasonable that when both functions are being fed, the rads might not heat up quite as quickly. Would be grateful if that could be confirmed, or whether that shouldn’t be happening. Thanks

 

[ShaunCorbs]

Yes the rads may take a smidge longer to come upto operating temp due to the hot water circuit being shorter and less resistance

I’m guessing you have a 3 port mid position valve ?

 

[Dunbar]

Many thanks for your reply. Had to look it up, but yes the pic that came up when I Googled, was exactly what I have.

 

[Dunbar]

Many thanks for your reply. Had to look it up, but yes the pic that came up when I Googled, was exactly what I have.

Just one other quick one. What happens if you set the diverter valve to manual?

 

[ShaunCorbs]

Just one other quick one. What happens if you set the diverter valve to manual?

On a mid position it opens the flap upto centre so both ports get a bit of flow

 

[Dunbar]

Yes the rads may take a smidge longer to come upto operating temp due to the hot water circuit being shorter and less resistance

I’m guessing you have a 3 port mid position valve ?

Yes, that's the one, thanks. As a matter of interest what happens if you have the valve on manual.

 

[ShaunCorbs]

Yes, that's the one, thanks. As a matter of interest what happens if you have the valve on manual.

It heats both at the same time

 

[Dunbar]

Cheers.