3033-005B Section 5: Plumbing
Concordia Xpress Technical Support Manual 5-15
2900-300B
Center Steam Valve
Operating voltage: 24Vdc
Orifice size: 0.081” (21cm)
This valve controls the flow of steam during steamed milk production,
and is open the entire time steamed milk is being produced.
Right Steam Valve
Operating voltage: 24Vdc
Orifice size:.120” (0.3cm)
This valve allows additional steam to flow during foamed milk production.
It is open the entire time foamed milk is being produced.
Air Purge Process
When the unit is first powered on from a cold start, it is necessary to
purge the air from the tank while the water is heating. If the air is trapped
within the tank, a “false head of steam” will occur and cause the machine
to think it is at operating temperature, when it isn’t.
To prevent this from happening, the left steam valve is activated
whenever the pressure within the tank is at or below 4psi/235°F (113°C).
Captive Water Purge System
The steam tank allows water in, but only steam exits the tank allowing a
potential build-up of scale inside the tank that could dramatically affect
the tank performance. The purge valve, located on the front of the steam
tank, opens during each brew clean cycle, flushing 0.3 liters of water
through the system and removing any sediment.
IMPORTANT: The steam tank purge valve is rated at 30psi. While this
valve looks similar to the steam fill valve, it is not the same. These valves
are not interchangeable. Be sure to verify the psi rating on the valve
solenoid prior to replacement of either the purge valve or the steam fill
valve.
Draining the Steam Tank
1. Disconnect the power to the machine.
2. Disconnect the water supply at the source.
3. Open the machine doors and remove the grounds bin.
4. Open the steam drain valve (right side). The red handle should
be vertical.
NOTE: It takes approximately 2-5 minutes for the steam tank to
drain. When the steam tank is no longer noisy and the steam
gauge displays 0psi, the steam tank is drained.
5. Close the steam drain valve. The red handle should be
horizontal.
6. Replace the grounds bin in the machine and close the machine
doors.
7. Reconnect the water supply at the source.
8. Reconnect the power supply to the machine.
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