Ive been starting up some new Mcquay water source heat pumps and have found some issues that I thought I would share. The 2.5 tons units have problems with the reversing valves not switching. Apparently the factory says the reversing valves are oversized and can't build up enough pressure to switch at start up. Their fix is to upgrade the control board software to version 3.0 which changes how the valve switches. It seems to work. The other issue I have found is plugged up distributors from the factory causing low suction temp alarm. When I open them up I find out the guy who silvered the fittings went a little heavy on the flux.