Volt free frost stat?

[PlumbingSucks]

Anyone know of a volt free frost stat? Need one for a ravenheat combi in a loft. the boiler only takes volt free controls. Can't find one on the internet!

 

[doitmyself]

Which Ravenheat?

 

[PlumbingSucks]

120T i think

 

[doitmyself]

I think your best bet will be to give Ravenheat a phone on 0113 252 7007 and ask for their advice.

 

[gasmarc]

honeywell do one for £12 i think ,have a look at screwfix

 

[wheeto]

As gasmarc says, or you can convert any 'stat to voltfree with the appropriate relay.

 

[gasmarc]

now I had this conversation with a mate who said it didnt matter if you used a 240v one as he said it was acting as a switch, I am not convinced myself because you would lose the anticipator ?

 

[doitmyself]

now I had this conversation with a mate who said it didnt matter if you used a 240v one as he said it was acting as a switch, I am not convinced myself because you would lose the anticipator ?

But do you need an anticipator on a frost stat? All it does is reduce the differential between on and off from three or four degrees to about 2 degrees.

Just checked, the Honeywell T4360A Frost stat does not have a neutral connection,so it should be OK.

The OP should also install an L641B pipe stat in series with the frost stat to prevent the water temperature rising too much.

 

[gasmarc]

ah sorry I was talking about a normal 240v room stat being used with 2 wires as opposed to 3 wires

 

[wheeto]

If you use wire it as normal, but with a 240v primary coil relay you can then use it as volt-free even with a compensator.

But the best option is to get the correct one for the job

 

[doitmyself]

If you use wire it as normal, but with a 240v primary coil relay you can then use it as volt-free even with a compensator.

That only applies to thermostats with an anticipator which require 240V for it to work.

But the best option is to get the correct one for the job

The Honeywell T4360A is a volt free thermostat without an anticipator and is the correct one for the job