20
98-0157 Rev P
4.2.5
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 12
Figure 13
Figure 14
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.
Figure 15
Concentrate to Drain Valve
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