I'm having a problem with my central heating which someone might be able to help me with.
My system has the usual boiler, pump, valve, cylinder and room stats. The programmer is a Landis Staefa RWB2E with separate controls for the CH and HW. However no matter what I do to the room stat, I cant get the central heating to kick in without the HW on and the cylinder stat set to a high temperature, eg 80 deg which apparently doesnt do the cylinder life expectancy any good.
I've gone through the wiring and drawn out all the permutations of Cylinder stat, Room stat, CH signal and HW signal, measuring the voltages at various points in the circuit.
It boils down to the boiler/pump voltage only going live when the cylinder stat is set high and the HW signal from the programmer is live.
I copied this diagram from http://www.diyfaq.org.uk/plumbing/plumbingpage2.html#valves as it seems to be exactly how my system is wired. The only difference is the grey line from the valve isnt connected to the "HW not wanted" signal which is available at the programmer but isnt wired up. Is this necessary and doesnt it mean the programmer will be short circuited when the cylinder stat is in the satisfied position?
[code:1]
PROGRAMMER VALVE
OUTPUTS: CONNECTIONS:
/
CH wanted 0----o o-------White
room stat
HW wanted 0----
| Orange<--
o |
/ tank stat |
o/ o---------------------OBoiler/pump
|
HW not wanted 0--------------Grey
[/code:1]
In the description on the above website, it states:
This doesnt happen in my case as the orange wire stays low. The valve is a Honeywell and it has 9221 on the case.
Anyone any ideas? I can give more details if needed.
thanks
Mike
[/url][/quote]
My system has the usual boiler, pump, valve, cylinder and room stats. The programmer is a Landis Staefa RWB2E with separate controls for the CH and HW. However no matter what I do to the room stat, I cant get the central heating to kick in without the HW on and the cylinder stat set to a high temperature, eg 80 deg which apparently doesnt do the cylinder life expectancy any good.
I've gone through the wiring and drawn out all the permutations of Cylinder stat, Room stat, CH signal and HW signal, measuring the voltages at various points in the circuit.
It boils down to the boiler/pump voltage only going live when the cylinder stat is set high and the HW signal from the programmer is live.
I copied this diagram from http://www.diyfaq.org.uk/plumbing/plumbingpage2.html#valves as it seems to be exactly how my system is wired. The only difference is the grey line from the valve isnt connected to the "HW not wanted" signal which is available at the programmer but isnt wired up. Is this necessary and doesnt it mean the programmer will be short circuited when the cylinder stat is in the satisfied position?
[code:1]
PROGRAMMER VALVE
OUTPUTS: CONNECTIONS:
/
CH wanted 0----o o-------White
room stat
HW wanted 0----
| Orange<--
o |
/ tank stat |
o/ o---------------------OBoiler/pump
|
HW not wanted 0--------------Grey
[/code:1]
In the description on the above website, it states:
"If, however, hot water is not required OR the tank stat indicates that the cylinder is hot enough, the grey wire will also be energised, and this will wind the valve to the B position. The *valve* will then supply the boiler/pump via the orange wire."
This doesnt happen in my case as the orange wire stays low. The valve is a Honeywell and it has 9221 on the case.
Anyone any ideas? I can give more details if needed.
thanks
Mike
[/url][/quote]