by jpboyt on Fri Jun 10, 2011 5:11 pm
If it's an automatic, start with the flowmeter as it has a small stainless orifice that aims the incoming water flow at the small paddle wheel, then look at the restrictor at the end of the rear brass fitting in the grouphead. After you remove the fitting you'll see restrictor that threads into the brass fitting and also hides a screen. Front brass fitting is just a cap. On any of the older Faemas that don't have the variable thermo siphon valve, there is a restrictor in the end of the top thermo siphon pipe. This controlls the rate of heating of the grouphead and can get scaled up. Group solenoid also has has a small orifice. Finally there is the thread in diffuser under the grouphead screen.
JPBoyt