Safety, sealed central heating

[sdsparks]

Is it law that a sealed central heating system needs a minimum level of interlock from a safety point of view I know the answer is yes from an efficiency point of view, came across a sealed central heating system today with no room thermostat. The way I see it is there is no means to shut down the boiler once the room is at temperature, therefore the water in system will expand until the PRV blows or th boiler over heats right?

[mfgs]

Boiler thermostat will shut it down. It need a PRV and an overheat stat to conform to the regs.

[AWheating]

boiler stat?

[emerald]

the boiler will have its own heating thermostat which the user can normally set, normally between 60-85 ish
(normally the heating return temp)

[Bartdude]

The boiler stat will stop it before then.When the boiler switches off the water will cool and the pressure will drop,obviously a room stat should be fitted,but that's for efficiency only(Building Regs Part L). The PRV and overheat stat are the safety net.

[diamondgas]

Is it law that a sealed central heating system needs a minimum level of interlock from a safety point of view

I believe a central heating boiler and system will need the minimum of:
1) fan flow proving device
2) Pump flow proving device
3) Flame ignition/maintenance proving device
4) water flow temperature control
5) water flow temp o/heat cut off device
6) system pressure relief valve
7) a means of taking up water expansion

And - anything else i left out!

[SimonJohns]

I believe a central heating boiler and system will need the minimum of:
1) fan flow proving device
2) Pump flow proving device
3) Flame ignition/maintenance proving device
4) water flow temperature control
5) water flow temp o/heat cut off device
6) system pressure relief valve
7) a means of taking up water expansion

And - anything else i left out!

1,2,4. Not required by law but are helpful



Sent from my iPhone using Tapatalk

[diamondgas]

Really SimonJohn? Weyabuggaman!

[pobsdad]

Not all sealed systems are on a fan flued boiler,so aps not needed.The pump can be outside the boiler,so proving switch not needed.Point 4 would be the boiler stat?

[diamondgas]

Not all sealed systems are on a fan flued boiler,so aps not needed.The pump can be outside the boiler,so proving switch not needed.Point 4 would be the boiler stat?

So I have got'ya thinkin ... true pobsdad .. I had in mind a system boiler and not conventional... fan assisted and not openflue, integral not external pump .... points taken *vbs*

Did I miss anything?