Mixing valve for underfloor heating

[Archmoco]

Guys can't get at the store to get a good photo, but in general I have the 3 pumps. One on the manifold, one between manifold and thermal store and other on the charging unit. I've attached sketch, only 2 pumps shown as 3rd is the laddomat between stove and thermal store (not shown on sketch)

the plumber ber has been back and altered the TRV so the supply temp can be altered.

i've a manual operated ESBE VRG 140, and to me thus is the issue? As I can have any heat in the thermal store 40-80 degrees I have to manually dial the ESBE valve, or do I just leave it as it is and use the TRV to set the desired temp to the UFH?

 

[Worcester]

Why three connections to the thermal store? should only be two.

Why the esbe and the trv ??
The 4 way esbe valve has:
1) Flow from source (top of tank)
2) Return to source (bottom of tank)
3) Flow to System (UFH)
4) Return from system

The esbe valve should be able to reduce the temperature to the desired flow for the ufh - you have too many controls in there !
(note the extra pump in this layout - not always necessary)




Your laddomat should be plumbed in like this: and will have no direct impact on the flow temperature around the ufh circuit as this will be controlled by the esbe (indirectly it will affect the speed of heat up of the thermastore)

Laddomat 11-100 placed by the boiler or the accumulator.

If you had a mixed system (radiators / ufh) then the use of the esbe AND the TRV together might make some sense, if you're only running a single ufh manifold, then you only need one control device to blend the temperature down to the ufh design temperature.

There should be no direct connection between the boiler and the ufh - that's why you have the thermal store.

 

[Archmoco]

Worcester,


the guys have indeed installed motorised valve pump etc for a planned upstairs which would be heated with oversized rads

laddomat is as per your attachment above, but pump is activated by pipe stat, going to change to flue stat as pump is staying on too long and was cooling tank, but I've got into habit of turning setting to max before I go to bed which has solved issue.

Akvaterm Solar plus 1000ltr, surely connection top middle and bottom of tank?

TRV would be used for setting ground floor UFH and ESBE for upstairs rads (if and when it ever gets converted)

 

[Archmoco]

Apologies,
that should have been 'VRB 140'

 

[Worcester]

Properly installed the laddomat shouldn't cool the tank.. The idea is that it doesn't heat it until the boiler is up to temperature.........