Thanks Rich for the pictures and suggestions.
Your explanation about the valve design now makes sense.
I will open up the two valve covers and see what's behind them, over the weekend. The manual when compared to Sanyo and Mr Slim is poorly written, which has led to quite some confusion.
I do plan to do the pressure test with Nitrogen. With the LG valve design it appears that I just have to hook up my manifold gauge to the gas service valve and pressure the system which will pressurize all 3 line sets.
With the main valve closed (before R410A release), can I pressure test the system with the schrader valve (service valve) ?
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