RF Mains link kit on a heating system.

[Soulsurfer]

Think I've got it worked out.

 

[Leesparkykent]

Think I've got it worked out.

Hi mate, sorry I didn't reply I've been flat out....If the hot water valve is next to the cylinder along with the cylinder thermostat then you need perm live, neutral, earth, switched live from 6 on heat link to common on cylinder stat, normally closed on cylinder thermostat to brown of the valve and orange to fire the boiler. Where is the heatlink in relation to the cylinder? What about the CH valve...where is this located in relation to the heat link and cylinder?

 

[Soulsurfer]

Hi mate, sorry I didn't reply I've been flat out....If the hot water valve is next to the cylinder along with the cylinder thermostat then you need perm live, neutral, earth, switched live from 6 on heat link to common on cylinder stat, normally closed on cylinder thermostat to brown of the valve and orange to fire the boiler. Where is the heatlink in relation to the cylinder? What about the CH valve...where is this located in relation to the heat link and cylinder?

Nice one then mate that's basically exactly what I've done, ripped out all the old and wired new. The Heatlink is in the garage next to the wiring ctr newly fitted, the boiler there too and the Htg valve is an old Sunvic / Satchwell there too as the flow leaves the boiler horizontally on pipe there, has a yellow to open on 240, white to apparently close it again. This valve does not work well at all but was logged as fitted in 1983 ! so I plan on Monday to replace with an HPA2 or 4043 Honeywell and spring return.

Cylinder is upstairs in house with a t & e feeding and supplying neutral up to it only. (no 3 core for a sw line !)

Originally this was fed directly from load side of dp switch so I have reconnected this twin to the wiring centre to take a switched line from 6 on heatlink call for dhw, then a neutral too of course as you have also said- now feeds cyl stat and then out onto the dhw valve which is a new Danfoss HPA2 spring return 2 port.

As it was the boiler sat with a switched line from roomstat and link to pump for htg only and if cyl stat closed the valve would open and just let hot water seep through coil by gravity feed and no real control other than boiler internal stat.

There lies my pain issue ! no switch line from cylinder (no extra core / 3 core flat etc..) the route is riddled with asbestos too so hence my idea of rf mainslink at cylinder position, picks up feed and say I also feed grey on valve micro, then orange of valve on to rf and other rf down at wiring ctr / heatlink to feed out on to boiler fire when dhw valve opens fully, giving more control on hot water.

 

[Leesparkykent]

Yeah I've never really been a fan of momo valves. Don't sunvic make a spring return valve that will directly replace the momo valve head without having to drain down etc? Is the cylinder vented or unvented?

 

[Soulsurfer]

Yeah I've never really been a fan of momo valves. Don't sunvic make a spring return valve that will directly replace the momo valve head without having to drain down etc? Is the cylinder vented or unvented?

Vented cylinder, and it's sound the other two valve heads fit straight onto existing valve.

 

[Leesparkykent]

What I would of been inclined to do would be to install a wireless cylinder thermostat, use the twin skin as LNE for the valve and the RF link link for the switched live from the valve. This way everything would be fed from the same SFCU/plug top.

 

[Soulsurfer]

What I would of been inclined to do would be to install a wireless cylinder thermostat, use the twin skin as LNE for the valve and the RF link link for the switched live from the valve. This way everything would be fed from the same SFCU/plug top.

Ok all still fed from same single supply though just not got the wireless cylinder stat. Never fitted a wireless stat to cyl. Any good

 

[Soulsurfer]

So have set up the RF kit etc.. and all was great until the micro switch on dhw valve calls to the boiler which is old school L,N,E no sw/l and by feeding onto that which is of course linked to a pump it then back feeds 240V to the pump via the linked cable with the switched lines to call the boiler on from cylinder stat or roomstat and by doing so it starts the pump running against a closed Htg valve ! as room stat is still at 0V not calling.

Hope you get what I mean ?
Apparently you can sort this out with a relay ? It might be something simple but I can't see a way round it as yet.