MAINTENANCE MANUAL
Speedster
page 30
7.
Re-mount drain hose to expansion valve. Wiggle the tube a little when fastening
the nut, do not over-tighten the nut.
8.
Re-mount upper body panel (if removed), then side panel(s).
Procedure when machine is warm/hot
Extra material needed
blind filter
1.
(Make sure machine is switched “on”.)
2.
Remove both left and right side panels and upper body panel. (When the outer
nut of the expansion valve is not too tight, there is no need to retain the
expansion valve such that the left side and upper body panels do not have to be
removed.)
3.
Unscrew outer nut from expansion valve with a 16 mm spanner. Retain expansion
valve with 21 mm spanner. Let drain hose with short copper tube and nut dangle
to side.
4.
Turn the set screw inside the expansion valve with Allen key 5 mm clockwise to
increase the opening pressure of the valve.
5.
Replace filter basket in filter holder by blind filter.
6.
Mount filter holder in group.
7.
Activate pump (brewing lever in lower position).
8.
Check pump pressure in coffee boiler on (right) pressure gauge.
9.
Increase pump pressure to 12 Bar by turning the set screw on the pump
clockwise. It is possible that the expansion valve starts to leak water, in that case,
replace the sealing disk in the valve (see below).
Beware!
The set screw is made from brass and is easily deformed. To avoid
damage use a screw driver that snugly fits the slot.
10.
Turn set screw inside the expansion valve counter-clockwise until the valve starts
to drip. Have a towel ready to pick up the spills.
11.
De-activate pump (lever in upper position), wait for 3 seconds and watch pressure
drop on gauge.
12.
Turn set screw on pump anti-clockwise to reduce pump pressure.
13.
Activate pump and increase pump pressure slowly until expansion valve starts to
drip. If necessary, adjust pressure at which expansion valve starts to drip.
14.
De-activate pump (lever in upper position).
15.
Re-mount the hose to expansion valve. Wiggle the tube a little when fastening the
nut, do not over-tighten the nut.
16.
Re-mount upper body panel (if removed), then side panel(s).
17.
Set pump pressure back to 9 Bar (use ground coffee in filter basket; see section
“adjust pump pressure”.)
Replace sealing disk in expansion valve
Materials needed
Spanner 16 mm, 21 mm, adjustable
Allen key 5 mm
Small screw driver
Replacement (Viton) sealing disk
Loctite or Teflon tape
Heat resistant, food safe, silicon grease