My plumber recently installed an Ariston presurised indirect cylinder for me. When he came to do it he replaced a 3 way valve (think he called this a y plan) with two 2 way vavles, one that came with the system and one that I bought. After he had finished I sat down and tried to understand why the need for 2 valves. I do not have any zones split up...Am I missing something? If so could someone point me to any diagrams that might clear this up.
Presurised cylinder
- Thread starter eric35red
- Start date
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The unvented needs a qualified person to install it as they can explode and demolish a building.
Its not necessary for you to understand how it works but if you had to then read the installation book with the cylinder.
An unvented has to have a spring return to closed valve as part of the safety protection devices.
It is possible to fit it on a system with a three port valve but its easier and becomes a standard layout to use a second two port.
Tony
Its not necessary for you to understand how it works but if you had to then read the installation book with the cylinder.
An unvented has to have a spring return to closed valve as part of the safety protection devices.
It is possible to fit it on a system with a three port valve but its easier and becomes a standard layout to use a second two port.
Tony
Agile said:
Thanks tony. Didn't install it myself but like to understand things when they are done. Still dont understand what two two port valves will do that the 3 port wouldn't do?
eric35red said:
because if a two port valve fails the it will shut and thus stop any water flowing through the cylinders control
whereas a three port valve when it fails fails to hot water open and still allows water to circulate through the coil
as agile says this is a safety feature
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like the OP I don't know why the installer changed the 3port mid possition valve, it certainly wasn't necessary and an added expense.
As per the manufactureres instructions, the mid possition valve operates as normal, and the 2 port supplied with the unit is an added safety device controlled via the thermal cutout.
As per the manufactureres instructions, the mid possition valve operates as normal, and the 2 port supplied with the unit is an added safety device controlled via the thermal cutout.
corgiman said:easy tiger
I have only done it twice and cocked it up twice, please dont ask me how cos I have had four ciders and am now away with the fairies YAY
so I just whop an s plan on now easy peezy
I have never done it, we have our own electrician for the sparky bits
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