Change Honeywell T40 to Salus RT500RF

[RichofBozeat]

Hello

I'd like to improve the efficiency of my oil fired heating by replacing the standard T40 thermostat with a Salus RT500RF. My reason is that I want more than the combination of fixed temp and on/off timer switch, so the heating can stay switched on but offer a day and night /weekday weekend temperature setting. Hope that makes sense!

My T40 is supplied by 3 wires (I'll post a pic if I can figure out how):

- brown - permanent live (switched from a Honeywell ST6400A timer)
- blue - seems to be neutral
- yellow - switched live

My question is whether this wiring is sufficient to enable a straightforward swap to the Salus unit or not. I'm hoping of course that I don't have to start digging into the wiring of what is a new house to me, and that this will be an easy one!

Thanks for any reassurance you can offer.

Rich

Untitled

• RichofBozeat
• 10 Feb 2015
• 1

Untitled

• RichofBozeat
• 10 Feb 2015
• 1

 

[Tibbot]

You won't improve efficiency by changing the most reliable stat on the market to the most unreliable. If you have wires in place why not put in a 2 wire programmable, much better than RF (as long as not Salus).

 

[RichofBozeat]

The only reason for the wireless idea was because the current stat is in the hallway where I don't much care what the temperature is. I thought the wireless option would enable me to manage the temp in the "lived in" rooms.

However if the most sensible solution is to go for a wired programmable, that will utilise the existing wiring, then I'm open to recommendations as I'm not experienced with these things. Would a Honeywell CM907 be better?

Many thanks.