digital thermostat

[scottyni]

i want to replace a sunvic tlx 2259 with a homexpert thr840duk but cant work out the wiering i have two red one black and the earth can some one help me with how to wire this up i am running it on oil heating thanks

 

[seco services]

Sunvic - Homexpert

Term 4- Not needed
Term 3- A
Term 1- B

 

[scottyni]

thanks but can you tell me what couler of wire goes to witch one i have two reds a black and the earth the earth i know where to put

 

[scottyni]

my homexpert has letters a x b y c no numbers sorry to be a pain

 

[ChrisOxford]

If you can post links to the manufacturer's instructions for BOTH thermostats, someone will help you

 

[picasso]

Have you taken your old stat off without taking any note of which coloured wires were in what terminals ?

 

[scottyni]

wires where marked when i removed it but on removing it have found out i have 2 reds ,2 blacks .and 2 earths only three terminals on homexpert on sunvic 2 red wires had there own terminals the 2 blacks shared one termina the earth i know what to do withl

 

[seco services]

my homexpert has letters a x b y c no numbers sorry to be a pain

Sunvic - Homexpert

Term 4- Not needed
Term 3- A
Term 1- B

As i said above.
Take the wires from the sunvic terminals 4, 3, 1 and put them in terminals A, B of the homexpert.
Term 4 from the sunvic is not needed so isolate and make safe.