S1 Owner’s Manual
Page 18
1. Adjust the group pressure to 12.5 bar per the following instructions:
a) Loosen lock nut "A" using the 14mm wrench
b) Tighten nut "B" 1-2 turns using the 10mm wrench
c) Turn on pump until pressure on the PF gauge stabilizes
d) Repeat steps b & c until pressure reads 12.5 bar
2. The expansion valve
“C” should open at 12.5 bar
3. If no water is dripping or running from the tube below nut "C" at 12.5 bar the
expansion valve is set too high. Use the 21mm socket to loosen nut "C" (rotate
counter-clockwise as viewed from the bottom of this valve) until the valve just opens
when running the pump as the pressure reaches 12.5 bar.
4. If water is pouring out of tube below "C" before the pressure hits 12.5 bar, use the
21mm socket to tighten nut "C" (rotate clockwise and viewed from the bottom of this
valve) until the valve is just opening at this pressure. If you back off the PF pressure
