Help with Thermostat Wiring Diagram

gaza4

Hi all

one of the thermostats in the house is gone so went to Heat Merchants to get a replacement. i figured replacing it would be simple as changing a light switch or power outlet but i cant figure out these wiring diagrams!!!


this is the wiring diagram of the current broken thermostat (Towerstat RS)
https://live.staticflickr.com/2726/4422369290_24ca4b85b5_b.jpg


and this is the new EPH CM2
https://www.ephcontrols.com/wp-content/uploads/2017/05/20171129_CM_-_DS_JW.pdf


can someone tell me how these two diagrams line up with each other?
interesting to note that my current thermostat has 3 wires connected whereas the diagram for the new one only seems to use 2. maybe i've got the wrong model?

meercat

In your old thermostat use cables connected to 1&3 and connected them to 1&2 in your new thermostat. Not sure if your 3rd cable is a neutral or earth (post photo or say where it’s connected ). If it’s a neutral then it’s not required for your new stat.

gaza4

meercat wrote: »

In your old thermostat use cables connected to 1&3 and connected them to 1&2 in your new thermostat. Not sure if your 3rd cable is a neutral or earth (post photo or say where it’s connected ). If it’s a neutral then it’s not required for your new stat.

thanks for the reply, here is a pic of the old thermostat still wiring up to the wall, hope that helps

meercat

The blue wire is not required but can be connected into N of your new thermostat

John.G

Would the old towerstat have a heat anticipator whereas the CM2 doesn't?.

gaza4

John.G wrote: »

Would the old towerstat have a heat anticipator whereas the CM2 doesn't?.

What is the function of a heat anticipator?

John.G

Its to stop too rapid switching and over/undershoot of a thermostat, probably not seen that often in roomstats since the room temperature changes at a relatively slow rate.

The neutral in your old stat was/could be probably used in conjunction with a indicating ON LED from the switched live.

listermint

Ideal time to replace with sonoff TH16 and a sonoff temp sensor.


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