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E.7. DHW RECIRCULATION PUMP
OPTIONAL ACCESSORY (NOT REQUIRED)
This cannot be used together with an electric heating element controlled by the controller.
If you require using both a circulation pump and an electric heating element, you can either
use an el. heating element controlled by its integrated adjustable thermostat, or control the
circulation pump by an external time switch.
In order to activate the output to a circulation pump at the R3 terminal, it is necessary to set
the menu 7.9.9.1. to Off and 7.9.15.1. to On. The circulation pump can be controlled by a time
program (7.9.15.7.) or according to temperature (7.9.15.2.). For control by temperature it is
necessary to retrofit a contact temperature sensor on the pipe (code 9789) and set 7.9.15.4.
= S1. In this configuration, the room sensor cannot be installed, however it is still possible to
install the Caleon room unit.
5.23.6. Circulations periods
For each weekday, three time intervals can be specified when the DHW recirculation pump
function is active. (If a temperature sensor is installed, the function will be switched on only if
the temperature conditions are met.)
5.23.1. Min. DHW recirculation temperature (Tmin)
The circulation pump will switch on when the temperature at the reference sensor (5.23.3)
drops below this value.
5.23.2. Hysteresis for switching off the pump
If the temperature at the reference sensor (5.23.3.) reaches the set value of Tmin (5.23.1.) +
hysteresis, the DHW circulation pump will be shut down.
5.23.3. Circulation sensor in the DHW recirculation piping
Selection of the reference temperature sensor for recirculation.
5.23.4. Circulation pause time
Pause time before the circulation pump is started again.
