3033-005B Section 5: Plumbing
Concordia Xpress Technical Support Manual 5-9
2900-300B
Water Pressure Gauge
The water pressure gauge is located behind the front panel. As the pump
is activated, the gauge will reflect the pump pressure.
The water pressure gauge does not necessarily reflect the line pressure
when the pump disengages. The one-way check valve maintains an
internal pressure.
Setting Pump Pressure
This procedure must be done while extracting a double espresso.
To set the pump pressure, turn the adjustment screw located on the
water pump assembly. Adjust in quarter-turn increments. The pump must
be set between 135-140psi for proper brewing.
Expansion Valve
The expansion valve, located at the input side of the water pump, allows
pressure to escape when the pressure within the water tank exceeds
140psi due to thermal expansion. This provides a 35psi buffer between
the expansion valve and the 175psi pressure relief valve.
Check Water Flow Message
The CPU is programmed with a 60 second “time out” feature. Specific
water volumes are set for each espresso extraction.
EXAMPLE: If the setting for a double espresso is 60mL and 60mL of
water does not pass through the flowmeter within 60 seconds, the
machine will time out and CHK WATER FLOW will appear on the
machine’s display.
To troubleshooting this error message, please see the Check Water Flow
troubleshooting tree in Section 15: Troubleshooting.
Viewing pump pressure
1. Navigate to TEST ROUTINES > WATER PUMP.
2. Activate the pump. The water gauge will display
current pump pressure.
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