Jamia,
I can sense you are more confused now and that's not the intention coming on here, you have a very old system with no pump run on but there are wiring diagrams for this that look nothing like the modern Y plan, its on page three of the Danfoss booklet and mid position wiring of the valve on page 2 of the valve leaflet, it really should be a simple wiring matter and there is little to go wrong, for someone with a tester and the circuit diagram it should take 5 mins to find out what is wrong, where do you live. If you want to know how it works just PM me and then I can talk to you on the phone. Just check this is the valve on the data sheet below. You should get it resolved here, this is simple has making chips. Please check and see how many wiring there are into the valve there could be end switches that you may not need to be wired on this old plan below, there maybe more numbers on the valve than you have given us.
Tony
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