4. Hydraulic Theory
The rinse valve is open in the Rinse and Prime Modes, in Self Test
(except UF test) and in the Calibration Mode when the UF Flow
Meter is being calibrated. Therefore, when the dialyzer connectors
are not connected to the Instrument, the rinse valve must be closed.
4.5.2 Heat Disinfection Recirculation Valve
The heat disinfection recirculation valve diverts the effluent water
back into the input side of the heater (with the water on/off closed)
in order to heat the water to above 84°C and maintain that fluid
path temperature for the time set by the service technician. For
more information, refer to Section 9, Disinfection.
4.5.3 Citric Acid Valve Manifold (optional)
This manifold is part of the Citric Acid option. It consists of a
normally-closed two-way valve, which opens during the Citric
Acid Heat Clean Mode if the dialyzer connectors are on the rinse
block and citric acid is to be infused.
If the dialyzer connectors are removed from the rinse block during
citric acid infusion, the citric acid valve will close, citric acid
infusion will stop, and the message PLACE DIALYZER LINE ON
RINSE BLOCK will be displayed.
For more information on the Citric Acid option, refer to Section 2,
Physical Description, and Section 9, Disinfection.
Figure 4-14. Citric Acid Option Hardware
157-1278-893 4-19
January 2004
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