Danfoss Randall RAVI - VMT 25/2 28mm Cylinder Valve For Gravity Primaries
Those!
Met potential customer the other day with zombie oil boiler running semi-gravity system.
Modern cylinder, but complaint that water too hot. Measured outlet from cylinder at 65°C with open tap. No thermostatic control except boiler stat and customer understandably doesn't want to set this down further as the guy who does his boiler told him to use the setting he is using.
My feeling is that using a thermo-mechanical valve like this won't help as Danfoss want it on the return and since it's not a snap open/close valve, more like a TRV, I won't be able to achieve 60°C with accuracy. Also, the boiler would still dry-cycle so won't even save much oil.
I think customer ideally needs a conversion to C plan if he insists on keeping that boiler. But I think that the best advice would otherwise be to just accept that the cylinder will be at 65° and fit TMVs to outlets as 65 will still be 'too hot'. The kitchen sink would need the hot pressure boosting to get the within the desired 1:5 pressure imbalance, or a dedicated low pressure cold feed for the TMV.
Question for those slightly less weird than me: am I making sense or would you do it differently? Ta!
Those!
Met potential customer the other day with zombie oil boiler running semi-gravity system.
Modern cylinder, but complaint that water too hot. Measured outlet from cylinder at 65°C with open tap. No thermostatic control except boiler stat and customer understandably doesn't want to set this down further as the guy who does his boiler told him to use the setting he is using.
My feeling is that using a thermo-mechanical valve like this won't help as Danfoss want it on the return and since it's not a snap open/close valve, more like a TRV, I won't be able to achieve 60°C with accuracy. Also, the boiler would still dry-cycle so won't even save much oil.
I think customer ideally needs a conversion to C plan if he insists on keeping that boiler. But I think that the best advice would otherwise be to just accept that the cylinder will be at 65° and fit TMVs to outlets as 65 will still be 'too hot'. The kitchen sink would need the hot pressure boosting to get the within the desired 1:5 pressure imbalance, or a dedicated low pressure cold feed for the TMV.
Question for those slightly less weird than me: am I making sense or would you do it differently? Ta!