"John Rumm" wrote in message
o.uk...
ARWadsworth wrote:

Unless I am mistaken then Permanent Standby Mode means Off.

http://www.uk-plumbing.com/brochure/...s/RDJ101RF.pdf

Not off as such, but more "on but ignoring any programmed temperature
slots" (and instead using the setback temperature all the time).

Prog stats seem to have two common MOs... Some just have multiple time
zones and you select the start for each and the temperature to
achieve/maintain during that time span, e.g.:

21 at 6:30am
18 at 9:30am
20 at 4pm
22 at 6pm
15 at 11pm

Others have a smaller number of programmable slots where you can specify
start and end times for the slot. However the slots don't have to be
contiguous. They also have a "setback" setting. This is a minimum
temperature below which you don't want it to fall. Often you would set
this to something like 10 or 15 for overnight, or perhaps 5 for frost
protection. The setback setting will apply to any time that is not
included in a programmed slot.

So say you had a setback set to 15, and then you programmed two slots:

21 from 6am til 9:30am
22 from 3pm til 11pm

The stat would then run the heating enough to maintain the above temps in
those slots, and 15 the rest of the time.




--
Cheers,

John.

I know. It is just that I fit a lot of the Siemens stats (not through
choice) and the customer is only familiar with a back boiler and no controls
(maybe a switch for the pump) or a coal fire.

Adam