I have a newly installed Climatemaster 4-ton Tranquility 30 unit (replaced Waterfurnace unit). The diagnostic data always indicates "N/A" when the unit is in stage 1 cooling. Is this normal? A manual check via p/t ports indicates a pressure drop of 3-4 psi. Here's a picture of the diagnostic screen. Does anything look out of the ordinary? In Stage 2 cooling I usually have a flow rate of 11 or so gpm. The unit does have a variable speed water pump so I wonder if it reduces water flow so dramatically that it doesn't register a gpm reading? If anybody knows if this is normal, or if I need to get my installer to address an issue, I would appreciate any advice. Thank you.