MAINTENANCE MANUAL
Speedster
page 23
Replace anti-vacuum valve
The anti-vacuum valve could malfunction when the machine is turned off regularly. It is
advised to replace the anti-vacuum valve every year.
Some sputter and hiss inside the drain pipe at the back of the drip tray is normal when
the machine is warming up from cold when the water reaches boiling temperature and a
little steam is released through the anti-vacuum valve into the discharge.
A malfunction of the anti-vacuum valve is recognised by a continuous hissing sound
combined with the lack of pressure and temperature building up while the heater in the
steam/hot water boiler is engaged continuously and the boiler is filled automatically once
in a while. (However, a malfunctioning safety valve leads to similar symptoms.)
Materials needed
Spanner 13 mm, 16 mm, 17 mm
Allen key 3 mm
Replacement anti-vacuum valve
Procedure
1.
Turn Speedster “off”.
2.
Open the steam valve, this will relieve the pressure in the hot water/steam boiler.
3.
Remove left and right side panels first, then upper body panel.
4.
Pull the black silicone (drain-) hose from the anti-vacuum valve (see figure 13).
5.
Unscrew with a 16 mm spanner the brass nut underneath the sub-frame on which
the anti-vacuum valve is mounted. Retain the valve with a 17 mm spanner.
6.
Replace the anti-vacuum valve, do not tighten the brass nut with a lot of force.
7.
Put the silicone hose on the valve.
8.
Close the steam valve and turn the Speedster “on”.
9.
Check the anti-vacuum valve for leakage. If necessary, tighten nut a little more.
10.
Mount upper body panel first, then both side panels.
Figure 13. Showing anti-vacuum valve and nut to unscrew for replacement. Also showing
position of safety valve.
unscrew nut
anti-vacuum valve
hose
safety valve