Central Heating Relay help needed

[connectrix]

Stupid I phone I meant hw channel at top and room stat at bottom

 

[connectrix]

You are missing the point gravity hot water means gravity you do not use the pump to get hot water. You turn the boiler on that in turn heats the hot water that travels to the cylinder by gravity. There is no need for a relay or any of this.

i understand that the water will automatically heat as soon as the boiler is fired. so how does the boiler heat the central heating fluid then?

 

[guest119]

Right, with what you have got fitted.
channel one, perm live feed, switchwire out to boiler.
channel two, not a perm feed but a loop from channel one boiler supply.
Then channel 2 can switch all it likes but without channel one energised you dont pump cold water.
phew!


Boydy

 

[connectrix]

Right, with what you have got fitted.
channel one, perm live feed, switchwire out to boiler.
channel two, not a perm feed but a loop from channel one boiler supply.
Then channel 2 can switch all it likes but without channel one energised you dont pump cold water.
phew!

that means you cant have the central heating on without the hot water being on. If you do it my way you can turn the heating as normal (i know it will automatically heat the water) and you can also turn the hot water on , on its own without turning the central heating on?

 

[guest119]

No different to my suggestion Conne.
The only quick and cheapest way forward is to fit a zone valve to the top cylinder coil connection allied to a strap on stat.
Then the hot water wont try to achieve the same temp as the boiler, and...... you can have genuine heating only.

Boydy

 

[ayjay]

once the boiler is on, the hot water will gravitate around the coil in the cylinder by gravity theres zilch you can do about it, hot water cant be separated from the radiators end of
all a programmer can do is turn on the pump
+boiler
the feed pipes from the boiler to the cylinder coil are normally 32mm and are separately connected to the rear of said boiler theres no way of controlling the gravity flow to the coil

 

[ayjay]

No different to my suggestion Conne.
The only quick and cheapest way forward is to fit a zone valve to the top cylinder coil connection allied to a strap on stat.
Then the hot water wont try to achieve the same temp as the boiler, and...... you can have genuine heating only.

Boydy

the open expansion pipe that goes up into the expansion tank may become compromised by doing that !!!

 

[guest119]

once the boiler is on, the hot water will gravitate around the coil in the cylinder by gravity theres zilch you can do about it, hot water cant be separated from the radiators end of
all a programmer can do is turn on the pump
+boiler
the feed pipes from the boiler to the cylinder coil are normally 32mm and are separately connected to the rear of said boiler theres no way of controlling the gravity flow to the coil

Not true Ayjay, zone valve will kill gravity flow at top coil connection, not blocking off vent pipe.

Boydy

 

[connectrix]

How does the boiler heat the rads?

 

[ayjay]

i guess u might be right bouydy i trying to think how i did it on my old system--

- - - Updated - - -

How does the boiler heat the rads?

by gas and a pump

 

[connectrix]

On the pilot or does the boiler suppressor have to be fired?

 

[micknew]

Install a 2 port valve on the HW input to the cylinder and fit a cylinder stat to control it.

 

[guest119]

Strap on stat opens and closes zone valve on the top coil connection. Stat has switched feed from channel one to open valve, spring return. Valve supply looped to valve micro switch core grey, core orange to boiler.

Zone valve also on heating line close to boiler, either flow or return. Channel 2 via room stat opens valve (spring return) and runs pump. Valve supply looped to valve micro switch core grey, core orange to boiler.

Separate, independant HW and H with gravity HW. Pump will run as valve starts to open, not like a genuine S plan.

Boydy