MAINTENANCE MANUAL
Mirage technical manual
page 35 of 65
7. (keep left group activated) No water should drip from the expansion valve at 9 Bar. If it does,
increase opening pressure until it stops dripping, then turn another 2 full turns. If it keeps dripping,
replace the sealing disk (see below).
8. (keep left group activated) Increase the pump pressure by turning the set screw on the water
pump clockwise until the pressure gauge on the filter holder reads 12 Bar. (When the expansion
valve starts dripping before 12 Bar is reached, increase opening pressure of expansion valve.)
Note!
If the (pump) pressure has exceeded 12 bar, reduce pump pressure first and then shortly activate
another group to reduce pressure in the coffee system.
9. (keep left group activated) Decrease opening pressure of the expansion valve by turning the outer
nut anti-clockwise until the valve starts dripping water.
10. De-activate the left group. The expansion valve should stop dripping (when the machine is warm
cold water warming up in the heat exchangers will result in water dripping from the expansion
valve).
11. Remount black silicone drain hose on expansion valve.
12. Remount side panel.
Figure M 15. Showing expansion valve and way to make adjustments. Drain hose is removed from
valve.
