Wolf COB Installation Instructions And Technical Manual page 30

Cylinder hysteresis
Parameter HG15
HG15
5
Factory setting: 5 K
Setting range: 1 to 30 K
Cylinder primary pump
run-on time
Parameter HG19
HG19
5
Factory setting: 5 min
Setting range: 0 to 10 min
Max. cylinder heating time
Parameter HG20
HG20
2
Factory setting: 2 h
Setting range: 0 to 5 h
Minimum boiler water
temperature TK-min.
Parameter HG21
HG21
20
Factory setting: 20 °C
Setting range: 20 to 90 °C
30
19. Contractor level parameters
The cylinder hysteresis regulates the start point for cylinder heating. The higher the
setting, the lower the start point for cylinder heating.
Example: Set cylinder temperature 60 °C
Cylinder hysteresis 5 K
Cylinder heating commences at 55 °C and ends at 60 °C.
After completing cylinder heating in summer operating mode (the cylinder has reached
the set temperature), the cylinder primary pump will run on up to the maximum set run-on
time. The cylinder primary pump will switch OFF prematurely if, during the run-on time,
the boiler water temperature cools down to a differential between boiler and cylinder
water temperature of 5 K, to prevent the boiler cooling down too severely.
In winter operating mode the calorifier charge pump runs on for a fixed period of 2 min.
(irrespective of parameter HG 19).
Cylinder heating commences as soon as the cylinder temperature sensor demands
heat. The heating circuit pumps would be constantly switched off if the boiler was
undersized, the cylinder was scaled-up or if DHW was constantly drawn off during
DHW priority mode. The accommodation cools down significantly. One option
enables a max. cylinder heating time to be specified to limit this effect. If the set
maximum cylinder heating time has expired, error message FC52 appears on the BM
module. The control unit reverts to heating mode and cycles in the selected rhythm
(HG20) between heating and cylinder heating mode, irrespective of whether the
cylinder has reached its set temperature or not. This function remains enabled even
in parallel mode (parameter A10 set to 1). It is only disabled if it is set to 0.
Set this parameter to 0 in heating systems with a high DHW consumption, e.g. hotels,
sports facilities, etc.
The control unit is equipped with an electronic boiler thermostat, with an adjustable
minimum switch-ON temperature. The burner is switched on subject to the cycle block
if this temperature is not achieved when heat is demanded. The minimum boiler water
temperature TK-min. is also not necessarily achieved when there is no heat demand.
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