Channelplus H37XL Heating Controller

[selfbuildy]

Have just installed above 3 channel programmer. Problem i have is that underfloor heating needs a volt free contact from programmer,which above does not have

Has anyone had this problem?

 

[breezer]

is there not a link to remove? or fit a relay

 

[Spark123]

Is this the one?
http://www.horstmann.co.uk/downloads/ElectronicDocuments/Central-Heating/H37XL-ISeries2.pdf

The easiest way around this I can see is to fit an interposing relay somewhere.

 

[selfbuildy]

Yes thats the one. My last resort is the relay. I'm considering opening it up and somehow breaking the common

 

[fireman22]

hi just looked up programmer, you cant make it volt free so just use output to fire a relay and use a pair of contacts as your volts free switch.

 

[selfbuildy]

Thought i had to put one in. Was hoping(dreaming) there was another way

From hepworth diagram thought this controller would suit. It states on wiring diagram for volt free contact on pump demand, so why didn't it state this for programmer





http://www.hep2o.co.uk/ufh/wiringcentres.pdf

 

[fireman22]

selfbuildy you can use prog if that diagram correct the switched live goes in to I time terminal

 

[fireman22]

where do you think you need a volt free contact. the volt free contact next to the pump term is for signaling etc.

 

[fireman22]

it is a volt free output not an input i am in swansea where is the build

 

[selfbuildy]

You have got me thinking now. Because common was linked on programmer i was having a back feed to wiring centre on time 0 contact, which made internal relays on unit 'chatter'

I removed connections from time 0 and 1 and linked out. The unit then worked correctly. Only thing i can't remember i tried was just using switched live onto time 1(i'm sure i did but i.ve drunk a few since then )

I will try this tomorrow

 

[fireman22]

yes give it a go, i'm sure it will be fine, i will watch post tomorrow

 

[selfbuildy]

I took volt free output for boiler circuit, so when there was no demand it would switch boiler off.

 

[fireman22]

there is only one boiler tho i take it? how would that work if there no demand for under floor heating it shuts down boiler? but what is say hotwater being called for how would this over-ride it etc. need wiring diagram really

 

[selfbuildy]

It will work as demand for hot water and upstairs heating are in parallel to this

 

[RF Lighting]

I take it this is for a wet underfloor heating system?

I fitted the controls and boiler wiring for a velta 14 zone underfloor heating system years back, and remember fitting a relay near the boiler and programmer but can't for the life of me remember what it did.