Section 5: Plumbing 3033-005B
5-12 Concordia Xpress Technical Support Manual
2900-300B
Steam Tank Fill Valve
24Vdc, Solenoid type
The steam tank fill valve is located behind the steam tank and allows
water to enter the steam tank.
Steam Tank
Transducer
The transducer monitors the steam tank pressure. The transducer
detects tank pressure, relates it to a DC voltage and transmits the
voltage to the CPU. The CPU uses the information to regulate tank
pressure and display an associated steam temperature. For example,
12.5psi equals approximately 244°F (118°C).
Water Level Probes
The water level probes monitor the water level inside the steam tank.
If the CPU does not detect ground through the lower safety probe, the
heating element cannot be activated. Once the lower water level probe
sees ground, the heating circuit is allowed to be active, if needed.
If the CPU does not detect ground through the upper safety probe, the
steam tank fill valve is energized (open), allowing water into the tank until
the water level reaches the upper probe, at which point the valve is de-
energized (closed).
Measured voltage at the sensors when dry is 0.5Vac pulsed every
second.
When wet, the lower (safety) probe will read approximately 0.006Vac
and the upper (fill stop) will read approximately 0.014Vac. In TEST
ROUTINES, the probes will read either dry or wet.
Verifying steam tank fill valve
1. Navigate to TEST ROUTINES > STEAM FILL
VALVE.
2. Press the upper right arrow to activate the valve.
Verifying the water level probes in the steam tank
1. Navigate to TEST ROUTINES > UPPER STEAM
PROBE.
2. WET is displayed, if probe is seeing ground.
To Next Page
Loading...
