21
98-0157 Rev K
4.2.6
Disinfection Procedure
HEAT DISINFECTION
The MediQA is capable of a heat disinfection of its plumbing and membranes.
During the heat disinfection process the RO circulates water within itself at
185˚F for 30 minutes (adjustable). The valves on the unit are programmed to
act in similar fashion to the valves during a chemical disinfection of the unit.
Once the hold period of the unit is met, the unit undergoes a cool down process
where it calls for fresh cold water and dumps the hot water in the unit down the
drain. The following pictures will show the valve positioning during preheat, hold,
and cool down phases.
Preheat/Hold Period:
During the pre-heat and hold period, the RO disables its ability to call for water
from its water supply. The water in the unit is circulated throughout the
plumbing and membranes until it reaches 185 ˚F. Once the temperature is
reached, the water is circulated for 30 minutes (adjustable). The valve
positioning remains the same for both phases of the heat disinfection.
Figure 15
Figure 16
Figure 17
Concentrate to Drain Valve
Loop Return Valve
Product to Loop Valve
Cool Down:
During cool down of the MediQA after the heat disinfection, the concentrate to
drain valve opens periodically to allow the hot water in the RO to go to the drain.
This allows cool water to refill the tank, gradually cooling the unit down to its
operational temperature. All other valves remain in the same position throughout
the entire heat disinfect procedure.
Summary of Contents for MediQA MDP Series
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