Replacing my Potterton PRT2 thermostat

[Friendee44]

Hi All,

I have been reading other similar threads and think I have the gist of what I need to do, but would be most grateful if someone could reassure me before I take the plunge.

The PRT2 has 4 terminals: COM, H, TL, and N. The wires are connected Blue to N, Red to TL and Yellow to H. In addition TL and COM are linked together.

On my new thermostat - a Horstman Centaurstat 7 the terminals are:

1 - L (Line)
2 - Load (Heat)
3 - Load (Cool)
4 - N (Parking)

I think that what I need to do is connect Red to 1 (L), Yellow to 2 (Heat), and Blue to 4 (N).

The thing I'm a bit unsure of, is whether or not I need to connect the Blue, as it's shown as a dotted line on the circuit diagram. Also I'm guessing that I don't need to link any terminals together.

Thank you all in advance, for any help you can give.

 

[AndyPRK]

why would you want to replace such a great therostat ?!

You can get replacements on ebay if needed.

But yes your wiring would be correct.

may as well connect the blue, for somewhere to park it

no need to link any terminals

 

[Friendee44]

Thank you Andy,

I am replacing the thermostat for a 7 day programmable one. I have 3 pesky teenagers who play about with the current device and don't always switch it back!

Thank you again, I feel much more confident now (... and looking forward to regaining control of my heating bill!)