Viessmann VITOCAL 250-A - 1085 Hysteresis for Cylinder Heating; 1085.0 Start Hysteresis, Set Cylinder Temperature; 1085.1 Stop Hysteresis, Set Cylinder Temperature; 1087 Times for DHW Heating

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1085.0 Start hysteresis, set cylinder temperature
The set value specifies at what temperature below the
current set cylinder temperature DHW heating will
start.
E
A
D
F
G
F
t
C
B
Fig. 22
A
Stop hysteresis: Parameter 1085.1
B
Start hysteresis: Parameter 1085.0
C
Set cylinder temperature
D
Cylinder temperature
E
DHW heating demand
F
DHW heating OFF
G
DHW heating ON
1085.1 Stop hysteresis, set cylinder temperature
DHW heating ends if the set cylinder temperature
selected is exceeded by the value set here.
E
A
D
F
G
F
t
C
B
Fig. 23
A
Stop hysteresis: Parameter 1085.1
B
Start hysteresis: Parameter 1085.0
C
Set cylinder temperature
D
Cylinder temperature
E
DHW heating demand
F
DHW heating OFF
G
DHW heating ON
1087 Times for DHW heating
1087.0 Max. duration, DHW heating
DHW heating stops after expiry of the set duration,
regardless of whether the set cylinder temperature
plus the value in parameter 1085.1 has been reached.
Note
The next DHW heating period starts after expiry of the
duration in parameter 1087.1 at the earliest.
1087.1 Min. delay until next time DHW is heated
The next DHW heating period starts at the earliest
after expiry of the delay set here.
This delay time starts at the end of every DHW heating
period, regardless of whether the set cylinder tempera-
ture plus the value from parameter 1085.1 has been
reached: See parameter 1087.0.
DHW parameter group
1085 Hysteresis for cylinder heating
6218234
Parameter