Honeywell ZG 215N Operation And Putting Into Service page 15

design value and which at the lowest outdoor temperature requires
a maximum heating water temperature of approx. 70 °C and a mi -
nimum temperature of approx. 20 °C. Experience shows that most
systems are quite oversized. For the usual 70/50 radiator heating
è
B
systems, the basic setting 45 (instead of 50 °C) is correct.
Night decrease: Setting knob
C
C
On setting knob the size of the reduction to be triggered by the
C
timer is to be set. The setting of gives a parallel shift of the ope -
rating characteristic curve to the left (see dotted curve II). This le -
C
ads to a decrease in the room temperature. The scale division of
corresponds to a room temperature decrease of approx. K (°C). "0"
means no decrease.
è
Example: C -8 means that the nighttime room temperature
target value is lower by 8 K compared to the daytime value, so that
the room temperature at night can decrease to approx. 8 K below
the set daytime temperature and hence
e. g. to 12 °C (20 °C -8 K = 12°C).
C at -8 makes it possible to save quite a
The recommended setting
lot of energy with a large nighttime decrease. In some buildings the
rooms may become too cold.
In these cases, it is recommended to set a night decrease value of
about -5 or to switch on day mode earlier.
Examples with other operating ranges: