Quote:
Originally Posted by Craig
Did you measure the voltage across the connections while it was connected to the CCU cable, I've never tried that?
I thought it saw a full 12V, but was cycled open and closed by the CCU to maintain the correct temperature, resulting an a "pulse" to the monovalve. I may be wrong. As Brian said, the CCU is magic.
As I recall, I've directly connected 12V across the monovalve contacts (unplugged) and heard a distinct click when it changed position. I would not necessarily recommend that, I'm not really sure the valve is designed for a full 12V.
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I never measured it, but
AFAIK, the monovalve always gets a 12V supply and the CCU switches the ground on and off to maintain cabin temperature.
I'm not sure of the frequency and the results that Kerry observed might be the normal switching of the valve. I have a suspicion that it does quite a bit of shuttling back and forth.
When the pump was marginal, you could hear the monovalve cycle inside the cabin. That prompted me to immediately disconnect the pump and the monovalve then became quiet again.