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4.5.4. Switched auxiliary heat sources (ON/OFF Source, ON/OFF Source 2)
The ON/OFF source is intended as an auxiliary source for heating or as a backup source in
the event of a heat pump failure. In most cases, this source will be an electric heating element
located in the thermal store or an electric boiler connected in series with the heat pump.
The respective heat source can be switched on or off by the user with the
ON/OFF
button.
If the heating water temperature in the tank or zone drops by the value of the switch-on
difference below the required temperature, the time countdown will be activated
(Remaining
time to switch source)
. If the heat pump does not reach the required heating water
temperature by then, the auxiliary heat source is activated.
This function is used to save energy, an example being a high difference between the setback
and comfort temperature. With a higher difference of these temperatures, the desired heating
water temperature increases by more than 5°C, which activates the auxiliary source. At mild
outdoor temperatures, the heat pump can reach the required temperature within 45 minutes,
thus canceling the activation of the auxiliary source.
The auxiliary heat source is blocked above an outdoor temperature of +5°C. This value can be
changed on the service level. The main reason for this function is protection against a high
electricity bill for heating the building. If the auxiliary source is not blocked and the user does
not regularly check the condition of the system, it is not possible to find out whether there has
Desired temperature for
auxiliary heat source.
Status of auxiliary heat
source and Ripple control
(if used).
Auxiliary source
operation statistics.
Time remaining until the auxiliary heat source is
switched on after the switch-on difference is met.
Difference for auxiliary
heat source control.
