Thought this might be interesting information which seems to be new news to most that I have talked to...

As per Spolan tech support...

WHEN REPLACING THE POWER HEAD ON A NON ADJUSTABLE TXV, THE VALVE NEEDS TO BE CONVERTED TO ADJUSTABLE WITH THE CONVERSION KIT, OR COMPLETELY REPLACED IF IT CAN NOT BE CONVERTED. THE SETTINGS/PRESSURES ON THE NEW POWER HEAD MAY NOT MATCH THE OLD ONE AND THE TXV SETTINGS MAY NOT BE THE SAME!

Hope this saves some of you the major headache that I am going through right now not knowing this before hand...