...but just not yet.
I have another thread running all about whether my Hive system will work when I take the whole shebang to a new address. So, that house move has now happened (it's a friend moving house, not me) and this is where my problems start.
The 'new' house has a Worcester Greenstar Ri boiler, pumped CH and HW with a mid-position valve and a Horstmann 425 Diadem programmer which clearly has a ghost in it.
As a prelude to fitting the Hive, I did the usual wiring diagram for the house to plan out where everything is, physically and electrically. The boiler and programmer are in the garage (along with a frost stat) with everything else bar the room stat in the airing cupboard with the cylinder.
The 'wiring centre' in the airing cupboard is a fairly conventional set up...
...with the MPV coming in on the left, cylinder stat from bottom left and pump from bottom centre. But no sign of the room stat connections.
When I removed the programmer from the backplate I was faced with this...
...and this is where I get really confused.
Apart from not being able to see what is connected to where (but logic and a meter will show that in good time) there is no wire connected to terminal 3, HW OFF. It hasn't come out or been cut, it simply was never there as the terminal screw is fully in. Being winter I have no intention of opening this rat's nest and leaving the lady in the cold, until I have a day or two to understand it fully. The cables at the top are 'labelled' from the left, Pump+Boiler+N, Valve, F(Frost Stat) & Stat(Room Stat). Cables at bottom are Boiler on the left and mains on the right.
My question is why was this system wired like this (no wire to 3) and what is happening if HW OFF is NOT being sent to the grey wire on the valve? Permanent hot water when the CH is on I guess. Having a mixer shower, and being in a new-home cleaning frenzy, the lady needs the hot water, just not permanently.
Of course, being a mere DiY'er, I have probably missed something obvious here...
Your thoughts gentlemen and gentleladies?
I have another thread running all about whether my Hive system will work when I take the whole shebang to a new address. So, that house move has now happened (it's a friend moving house, not me) and this is where my problems start.
The 'new' house has a Worcester Greenstar Ri boiler, pumped CH and HW with a mid-position valve and a Horstmann 425 Diadem programmer which clearly has a ghost in it.
As a prelude to fitting the Hive, I did the usual wiring diagram for the house to plan out where everything is, physically and electrically. The boiler and programmer are in the garage (along with a frost stat) with everything else bar the room stat in the airing cupboard with the cylinder.
The 'wiring centre' in the airing cupboard is a fairly conventional set up...
...with the MPV coming in on the left, cylinder stat from bottom left and pump from bottom centre. But no sign of the room stat connections.
When I removed the programmer from the backplate I was faced with this...
...and this is where I get really confused.
Apart from not being able to see what is connected to where (but logic and a meter will show that in good time) there is no wire connected to terminal 3, HW OFF. It hasn't come out or been cut, it simply was never there as the terminal screw is fully in. Being winter I have no intention of opening this rat's nest and leaving the lady in the cold, until I have a day or two to understand it fully. The cables at the top are 'labelled' from the left, Pump+Boiler+N, Valve, F(Frost Stat) & Stat(Room Stat). Cables at bottom are Boiler on the left and mains on the right.
My question is why was this system wired like this (no wire to 3) and what is happening if HW OFF is NOT being sent to the grey wire on the valve? Permanent hot water when the CH is on I guess. Having a mixer shower, and being in a new-home cleaning frenzy, the lady needs the hot water, just not permanently.
Of course, being a mere DiY'er, I have probably missed something obvious here...
Your thoughts gentlemen and gentleladies?