New combi boiler & wireless programmer.

[Malcolm]

Hi I don't usually get involved with central heating wiring systems, but I had a new boiler fitted last week and I thought it would be a good idea to get to know how they work.
Could someone just check that i have got this right please.
The boiler is an Alpha Intech 34C combi, the wireless thermostat programmer is a Danfoss TP5000 Si, the receiver is an RX1 and a standard two port valve with brown, blue, yellow, orange & grey wires.
Ignoring the earths.
I have L&N feed going direct to the L&N of the boiler and the L&N of the receiver. In the receiver I have a link between L & 2, this is switched to 3 which is connected to the brown of the two port valve.
The grey of the two port valve is connected to a permanent live feed and the orange is connected to No1 on the boiler.
No 2 on the boiler seemes to be a constant live.
All seems to be working but I would like to know if all is as it should be.
Thanks for any replies.
Malc

 

[telectrix]

basically, you have L from boiler to stat. when stat fires, this sends sw. L to valve, opening valve and closing the valve microswitch.this sends the sw L to the boiler to fire it up. i assume the pump is integral to the boiler.

 

[LankyWill]

Sounds fine to me Malc

 

[Malcolm]

Telectrix . Yes it is integral.
Lankywill. Ok great thanks.

 

[Leesparkykent]

Also sounds fine to me but would be better to have the live no2 on boiler feeding the external controls. So no2 feeds live to programmer and grey of the valve. This way if the boilers internal fuse goes it cuts everything to do with the controls. Out of interest why do you have a two port? Do you have more than one thermostat?

 

[Ian1981]

Also sounds fine to me but would be better to have the live no2 on boiler feeding the external controls. So no2 feeds live to programmer and grey of the valve. This way if the boilers internal fuse goes it cuts everything to do with the controls. Out of interest why do you have a two port? Do you have more than one thermostat?

The only time I've seen 2 port valves on a combi is when there's 2 zones for the heating which is pretty much standard on new builds on all types of heating systems

 

[Leesparkykent]

The only time I've seen 2 port valves on a combi is when there's 2 zones for the heating which is pretty much standard on new builds on all types of heating systems

yeah that was my thoughts but was wondering why no mention of the second valve.

 

[Ian1981]

Lee you seem to be the man with the know how for heating systems.
Is it a requirement do you know that on say s plan heating systems that the boiler has a pump over run?
Plumbers have stopped fitting the logic heat 15 boilers on a site I recently visited, the electrician had took the pump link out of the wiring centre on the tank and wired it as a pump overrun as normall but the boiler wouldn't fire so I had to put the pump connection back with the heating/water on oranges as how it comes pre wired.
I found that the boilers they now fit don't have a pump overrun option.

 

[Malcolm]

There is another zone which is for UFH. This is yet to be finished so didn't mention it.
Thanks for all the info, it's all helping me to get my head round it.

 

[Leesparkykent]

Lee you seem to be the man with the know how for heating systems.
Is it a requirement do you know that on say s plan heating systems that the boiler has a pump over run?
Plumbers have stopped fitting the logic heat 15 boilers on a site I recently visited, the electrician had took the pump link out of the wiring centre on the tank and wired it as a pump overrun as normall but the boiler wouldn't fire so I had to put the pump connection back with the heating/water on oranges as how it comes pre wired.
I found that the boilers they now fit don't have a pump overrun option.

no mate it's boiler specific. There are not many domestic heat only boilers left of the market that don't require over run. Off the top of my head I can only think of a baxi that doesn't require it.

 

[Malcolm]

Ian, you're on about pump over run.
I cannot hear the pump running on this one after the flame stops. It is a quiet boiler though!

 

[Ian1981]

Ian, you're on about pump over run.
I cannot hear the pump running on this one after the flame stops. It is a quiet boiler though!

the pump overrun was more to do with a different heating system really