Programmer replacement?

[Manicol]

Hi all, First time user so new to forums and this site.

Hope its the right place to post this.

I would like to know if it is possible to replace a verrrrry old Myson Microtimer one with a Horstman Centaurplus C21 or C27. I have looked on the Horstman site and it's not clear.

Thanks in anticipation

 

[D_Hailsham]

What boiler do you have - make and model?

 

[Manicol]

Boiler is a Myson Orion, model is 30si original fit in early 1980s house.

 

[D_Hailsham]

OK.

The wiring is as follows:

Myson = Horstmann
T3 = T4
T6 = T3
T7 = T1 (if present)
L = L
N = N

The link between L, 5 and 8 on the Myson is not required on the Horstmann as there are internal links.

Make sure you write down which colour wire goes to which terminal before you disconnect the wires.

 

[Manicol]

Many Thanks, Done and working.