Building regs part L

[lordyjordy111]

Hi again

Just posted about these regs and have just read this

All new systems in dwellings that aren’t open plan must have at least two heating zones, each
controlled by a thermostat and zone valve. In addition, all radiators must have Thermostatic
Radiator Valves (TRVs) fitted except those in rooms with a room thermostat and those in
bathrooms.

does this mean you can't use three ports on new systems???

 

[AWheating]

yes you can use any motorised vavle to control your zones. 3 port should not be used on unvented cylinders.

 

[lordyjordy111]

Hi

@aw heating

thanks for your reply.....

bit confused, how can you use a three port if you now have three different zones ie 2 space heating and one hot water

bearing in mind one port of a three port is an inlet from the boiler???

 

[SimonG]

You could tee off after pump before 3 port and install 2 port. I don't like y plan and much prefer s plan and s plan plus.

 

[dave1]

yes you can use any motorised vavle to control your zones. 3 port should not be used on unvented cylinders.

Why shouldn't you use a 3 port on an unvented aw?

 

[SimonG]

You could, but you would still have to fit the two port, as it is part of the unvented's safety features.

 

[dave1]

Yep I knew that... Just read it as you can't use 3 port. Cheers.

 

[lordyjordy111]

thanks simonG
does this mean more faulty zone valve$ in the future????:yes:

 

[AWheating]

Why shouldn't you use a 3 port on an unvented aw?

well is not that you cant i guess it just a pointless exercise and waste of money.

 

[AWheating]

Hi

@aw heating

thanks for your reply.....

bit confused, how can you use a three port if you now have three different zones ie 2 space heating and one hot water

bearing in mind one port of a three port is an inlet from the boiler???

dont forget on a combi you only have two zones soyou could use a 3 port on the two heating zones on the combi i guess, tho ive never done it but it could be done........