Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 168

DHW control settings
Hysteresis; DHW instantaneous heating water . . .
A Set DHW temperature
B Heat pump switching hysteresis
("Hysteresis")
C Instantaneous heating water hea-
ter switching hysteresis ("Hys-
teresis; DHW E heating")
D Actual DHW temperature at the
upper cylinder temperature sen-
sor
E Heat pump control state
F Control state, instantaneous heat-
ing water heater
G OFF
H ON
"Hysteresis"
"Hysteresis; DHW E
heating"
168
Note
The value selected for "Hysteresis"
should be higher than the expected
temperature drop due to heat losses
in a single night (approx. 5 K).
A lower value for "Hysteresis DHW E
heating" increases the proportion of
electrical DHW heating, i.e. the sys-
tem efficiency drops.
Access
"Device settings"
"Programming"
"DHW"
"Hysteresis"
or
"Hysteresis; DHW E heating"
(5/%)
Standard setting
7.0 K
10.0 K
(cont.)
Setting range
1.0 to 10.0 K
2.0 to 30.0 K