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Element
Section 10: Edge SC Controller Operation
L-OMM-0003_A
• 10/8/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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Figure 61 - Sanitation Loop
CAUTION
Discharging water at elevated temperatures may cause scalding.
Discharging water at elevated temperatures into the DWV system may cause drain line
damage. Follow local codes and regulations. A corresponding discharge of cold water may
be needed in order to temper the water.
Before performing a water heater sanitation loop, it is recommended to perform a blowdown
cycle to remove any collected sediment at the bottom of the water heater tank. Physically
removing potential biofilm will assist in disinfection. It is unknown how much sediment is
present, so set the duration based on the experience of the last blowdown cycle and observe
how long it took to have discharge without sediment present.
Next, set the temperature and duration for the sanitation loop. The
disinfection setpoint
is the
control signal given to the water heater to raise the temperature temporarily. The
kill
temperature
is the control measure to ensure that a minimum temperature is reached. Once the
kill temperature is reached, the timer begins associated with the
control dwell time
. If the water
heater temperature goes below the kill temperature during the sanitation loop for a time period,
the cycle will fail and the setpoint will return to the previous setting.
Note:
Perform sanitation loop during a period of low demand to better control temperature.
There is the option of an
Accelerated Cool Down Cycle
where the volume returns to setpoint
quickly by purging the hot water from the volume and bringing in cold makeup water. The
duration of the cycle depends on the temperatures set during the sanitation loop and the
incoming cold water. Alternatively, if the accelerated cool down cycle is not selected, the water
will remain at temperature with the setpoint returned to the previous setting.
W A R N I N G
A demand for hot water may cause scalding as downstream mixing valves and fittings may not
be able to compensate for the elevated temperature.