I was hoping someone would be willing to sanity check my plan to replace a separate CH/HW programmer and room stat. The programmer is next to the boiler and the stat is in the hallway. It is a gravity fed system with a stat on the tank, built 1999.
The programmer is inflexible and I am a bit of a gadget fiend so I have been looking at the Heatmiser wifi solutions. Since I want the wifi unit to be able to control both the CH and hot water but do not want to site the unit (which includes the stat) next to the boiler, my initial plan was to use a RF model:
http://www.heatmisershop.co.uk/ther...i-rf-kit-wifi-programmable-with-hw-output-p94
This basically is a mains powered programmable room stat, but uses RF to wirelessly command a receiver. The receiver then controls the boiler etc.
The existing Horstmann C21 programmer is wired to L (red), N (blue), HW-on (yellow), CH-on (blue), and I assume I can swap it out and wire the RF receiver like for like.
The existing stat is a Honeywell T6360B 3 wire (plus earth). The new stat however does switching via RF, so only has permanent L and N. I plan to site the new stat in the same place as the old, but I am unsure if this is possible after having done some testing with a multimeter. When the stat calls for heat the contact is closed hence there is 230V across pole 3 (yellow) and 2 (blue neutral). But pole 1 (red) is not a permanent live, it is only live when the programmer also calls for heat.
So far, my plan is scuppered because I have no permanent live feed. The easy option is to keep the crappy programmer for water control, leave it set to "24 hours" for CH and replace the stat with a 3 wire wifi stat/programmer (non RF). But I was wondering if perhaps I can either:
A) bridge the switched output from the old stat (yellow) to live, then take permanent live for the new stat from the lighting circuit (there is a light switch immediately below).
B) try to figure out where the old stat wiring terminates, and swap connections over so the switched live from the timer goes off to the boiler instead of the hallway, and permanent live goes to the hallway instead.
Does this sound typical? Am I forgetting something? Where should I look for wiring termination?
The programmer is inflexible and I am a bit of a gadget fiend so I have been looking at the Heatmiser wifi solutions. Since I want the wifi unit to be able to control both the CH and hot water but do not want to site the unit (which includes the stat) next to the boiler, my initial plan was to use a RF model:
http://www.heatmisershop.co.uk/ther...i-rf-kit-wifi-programmable-with-hw-output-p94
This basically is a mains powered programmable room stat, but uses RF to wirelessly command a receiver. The receiver then controls the boiler etc.
The existing Horstmann C21 programmer is wired to L (red), N (blue), HW-on (yellow), CH-on (blue), and I assume I can swap it out and wire the RF receiver like for like.
The existing stat is a Honeywell T6360B 3 wire (plus earth). The new stat however does switching via RF, so only has permanent L and N. I plan to site the new stat in the same place as the old, but I am unsure if this is possible after having done some testing with a multimeter. When the stat calls for heat the contact is closed hence there is 230V across pole 3 (yellow) and 2 (blue neutral). But pole 1 (red) is not a permanent live, it is only live when the programmer also calls for heat.
So far, my plan is scuppered because I have no permanent live feed. The easy option is to keep the crappy programmer for water control, leave it set to "24 hours" for CH and replace the stat with a 3 wire wifi stat/programmer (non RF). But I was wondering if perhaps I can either:
A) bridge the switched output from the old stat (yellow) to live, then take permanent live for the new stat from the lighting circuit (there is a light switch immediately below).
B) try to figure out where the old stat wiring terminates, and swap connections over so the switched live from the timer goes off to the boiler instead of the hallway, and permanent live goes to the hallway instead.
Does this sound typical? Am I forgetting something? Where should I look for wiring termination?