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I am having problems with the control wiring in my central heating system. The boiler is a Baxi solo 40, controlled from a Drayton Tempus 7 programmer, a Horstmann Z322XL 3 port valve, with a cylinder and room stat.
The problem I'm having is the central heating will not come on without the hot water being selected on the timer. I can have hot water only, or both, but not central heating only.
It is wired at present with the HW On going through the cylinder stat to the orange wire on the 3 port. This also goes to the switched live on the boiler.
The CH On goes through the room stat to the white wire on 3 port.
Blue on 3 port goes to supply neutral.
Now I think the problem may be the grey (although I'm not sure), as it is connected to the normally open terminal on the cylinder stat.
I'm not sure how the 3 port valve works but it seems it must have some microswitches in a certain configuration that should make the orange wire live when either hot water or central heating is selected. I think the problem may be the grey wire, as in the present configuration it will only go live if the hot water is selected on the programmer. Should I connect it to the HW Off terminal on the programmer?
Any help will be appreciated
The problem I'm having is the central heating will not come on without the hot water being selected on the timer. I can have hot water only, or both, but not central heating only.
It is wired at present with the HW On going through the cylinder stat to the orange wire on the 3 port. This also goes to the switched live on the boiler.
The CH On goes through the room stat to the white wire on 3 port.
Blue on 3 port goes to supply neutral.
Now I think the problem may be the grey (although I'm not sure), as it is connected to the normally open terminal on the cylinder stat.
I'm not sure how the 3 port valve works but it seems it must have some microswitches in a certain configuration that should make the orange wire live when either hot water or central heating is selected. I think the problem may be the grey wire, as in the present configuration it will only go live if the hot water is selected on the programmer. Should I connect it to the HW Off terminal on the programmer?
Any help will be appreciated