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Have just bought a Honeywell 2 port valve (V4043H1056) to use in a 'C' plan system - the plan shows 6 wires from valve Grey, Blue, G/Yellow, Brown, White, Orange, mine has 5 wires (no White). Can anyone let me know the correct way to wire the 'C' plan using 5 wires (Grey, Blue, G/Yellow, Brown...