Elec Room Thermostat to replace mech Timer

Joined
12 Jan 2004
Messages
127
Reaction score
2
Country
United Kingdom
Hi, as my system has no Room thermostat, i have decided to replace my mechnical timer with an electronic timer/ room thermostat.
Here I am a bit confused. The mechanical timer appears to have its own electrical supply and two wires connected to the combi boiler. I want to replace it with a Hirstmann DRT2.

The Thermostat is a Horstmann DRT2, which has a
'no',
'com' and
'NC' connections in it (it is battery powered).

I want to connect it to the chaffoteaux et Maury Britony combi 80.
This has
1.Neutral,
2, Phase,
3, Room Thermostat live
4. Accelerator Resistor
5. Common for Accelerator and room thermostat

The horstmann instructionsa re pretty vague and suggest connecting the live to the 'Com', then the 'No' to the 'heater (or NC depending on the type of heater); and the neutral from heater to the Neutral.
So how should I connect this up? Seems very confusing
Cheers
Edward
 
Sponsored Links
You can work it out
NC = Normally closed. COM is connected to this when it's off (no call for heat)
NO = Normally open. COM is connected to this when it's on (calling for heat)

Accelerator needs to connect when it's on. This speeds up the stat's slow response to the room heating up, so it switches off again earlier than it would left to its own devices.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top