Temperatures; Setpoint; Hysteresis - A.O. Smith DRE PLUS Installation, User And Service Manual

9.2
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9.2.2
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Temperatures

The Temperatures submenu shows the temperature setpoint, the differentials, the actual
water temperature in the water heater and the tank sensor offset.
Fig. Temperature submenu
Press on a line with a [>] to set the setpoint or to set the differential. Press [BACK] to
return to the previous screen.

Setpoint

Caution
Preferably set the temperature setpoint to 60 ºC. Harmful scaling and lime build–up will
be higher when you set the temperature setpoint to 65 ºC and higher. At lower
temperature settings there is a higher risk of high Legionella concentrations in the water.
To change the temperature setpoint:
1. From the Temperatures submenu open the Setpoint control screen.
2. Change the water temperature setpoint:
a) Use [+] to increase the setpoint.
b) Use [-] to decrease the setpoint.
3. Press [ACCEPT] to confirm the value or press [BACK] to return to the previous
screen.

Hysteresis

The water heater does not start immediately when the water temperature is below the
temperature setpoint. To prevent that the water heater switches on and off too often,
there is a margin; the hysteresis.
The hysteresis is determined by the number of element rows and the differential setting of
each row. The sequence in which the rows are energized is: the first row to be switched on
is the last row that will be switched off. The default operating setpoint is 60° and the
Installation, Maintenance and Service part