Advice please: Programmable Room Thermostat

[dipsb_ 13]

Hi All

Was wondering if anybody can help me out...

I am trying to replace a standard Honeywell thermostat with a Sunvic Programmable Room Thermostat http://www.sunvic.co.uk/tlx6501.htm

My current Honeywell thermostat (not programmable) has 4 wires coming from it

* Earth
* Neutral
* Live
* Additional - this i have been told is a link (smaller red wire)

The new Sunvic programmable thermostat only has 3 places for wires to go in the following points

* NO
* COM
* NC

Please can someone tell me what goes where as I am confused?

Thanks in advance

[dipsb_ 13]

Hi All

I have attached the photo below of the wiring going to my current Honeywell room thermostat.

This is the programmable theremostat I have got http://www.sunvic.co.uk/tlx6501.htm

Really appreciate your help.

[sparkysi]

The honeywell is wired to give a switched live on demand to the boiler/heating controls. The yellow wire marked with red will be the switched live.

The sunvic is a volt free contact switch so you will need to put the live on the common on the switched output on the NO connection. Note that the sunvic does not require a neutral so please make sure you make this wire safe when you fit the unit. And do isolate the power before doing it.