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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Room thermostat https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1113769154 Message started by spongebob on Apr 17^th, 2005, 9:19pm

Title: Room thermostat
Post by spongebob on Apr 17^th, 2005, 9:19pm

Baxi 105e combi boiler. Currently only an onboard time clock bringing this boiler on and off. Does wiring in a new room thermostat come under Part P or is a CORGI guy required? If not what make of Stat is most compatible with this make of boiler?

Title: Re: Room thermostat
Post by bripl on Apr 17^th, 2005, 9:28pm

sparks and part p no need for corgi as the gas/flue are not being disturbed you may not even need a sparks if you are competant to do it but i am sure one of the sparks on the forum will give the correct advice ;D

Title: Re: Room thermostat
Post by chtechie on Apr 17^th, 2005, 10:57pm

Only part pee if the cable enters a forbidden area - that doesn't mean you can ignore BS 7671 - As you've got a timeclock already a 4360 Honeywell or equiv is what you need.

Title: Re: Room thermostat
Post by spongebob on Apr 18^th, 2005, 12:25am

Thanks for the info guys.

Title: Re: Room thermostat
Post by Lectrician on Apr 18^th, 2005, 7:48am

Some boilers with internal clocks and controls (most combies) require volt free contacts at the stat. This is due to 12v electronics inside the boiler.

Title: Re: Room thermostat
Post by chtechie on Apr 20^th, 2005, 9:52pm

Agreed lectrician - You can use 2 wires only to terminals 1 & 3 on a Honeywell - A more modern (but costs more) option is the Danfoss TP5. There are reasons why the Honeywell is not perfect used as a volt free stat but they're bomb proof construction.