Synesso Espresso Machine Technical Manual page 21

Water Outlet Components (cont.):
Low level probe:
This probe detects when the water has dropped below the level of the probe in the tank.
It sends a signal to the CPU which immediately cuts power to the heating element, registers
an "STLW00" error on the display and begins an audible alarm to alert the operator to the
problem.
Steam actuator rod:
This is pushed in when the steam handle is activated. The rod opens the seal, releasing steam
through the valve.
Steam gauge:
Displays the amount of steam pressure in the steam tank. The gauge reads between 0 and 4
bar (0-60psi) and normal operating pressure is 1.5 bar. The pressure is set to 1.3 in test.
Steam shut-off valve:
Safety device for service agents: turning this ball valve shuts off steam to the valve for
protection during repairs.
Steam tube:
Delivers steam from the upper part of the steam tank to the steam valve to heat and foam milk.
Steam tank thermal overload switch:
Cuts power to the element if the temperature exceeds 280° F.
Thermal probes:
2K ohm probes have been part of the Synesso™ machines since serial number 229 (prior to
this, 100 ohm probes were standard). These probes are highly sensitive and send thermal data
to the PID controller to control the temperature within the steam tank.
High level probe:
Detects whether the desired water
level has been reached. A small
amount of Voltage in Alternating
Currents (VAC) travels through this
probe in an open circuit. When water
touches the probe, the circuit is
closed (grounded) and the steam
inlet water control valve
closes. Both probes are adjustable
by turning the entire probe
clockwise to increase or
counter-clockwise to decrease
the water level. The bend in
the probe is identical inside the
tank, so the level of the water
inside is where the probe connects
to the wire on the outside.
Technical Manual
2011 3 Group Cyncra outlet (left) side
21