Hysteresis/Hysteresis Booster Heater - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

DHW control settings
Max. temperature
Danger
Risk of scalding with DHW at
temperatures over 60 ºC.
To limit the temperature to
60 °C, install a mixing device,
e.g. an automatic thermostatic
mixing valve (DHW cylinder
accessory).
Press the following keys:
1. "Device settings".
2. "Programming".

Hysteresis/Hysteresis booster heater

Parameter "Hysteresis" affects the
switching hysteresis during heating by
the heat pump.
Parameter "Hyst. booster heater"
affects the switching hysteresis during
heating by the instantaneous heating
water heater (accessory), external
heat source or immersion heater (on
site, for a DHW cylinder).
The settings determine the deviation
from the set DHW cylinder tempera-
ture ("Set DHW temp.") at which
cylinder heating is switched on and off
by the heat pump ("Hysteresis").
If an additional booster heater is
installed, also observe the "Hyst.
booster heater" parameter.
148
(cont.)
3. "DHW".
4. y/x for "Max. temp."
5. T/U for the selected value.
6. "BACK"
Delivered condition
Setting range
(6006).
to confirm.
60 °C
20 to 80 °C