Hg15: Cylinder Hysteresis; Hg16: Minimum Heating Circuit Pump Rate; Hg17: Maximum Heating Circuit Pump Rate; Hg19: Run-On Time, Cylinder Primary Pump - Wolf COB-2 Operation Instructions Manual

Parameter settings
7.2.8

HG15: Cylinder hysteresis

HG15 controls 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: Start at 55°C and end at 60°C.
7.2.9

HG16: Minimum heating circuit pump rate

In heating mode (burner stage 1), the feed/heating circuit pump does not regulate below this set value.
This parameter has no function if a feed/heating circuit pump with no PWM signal control is used.
7.2.10

HG17: Maximum heating circuit pump rate

In heating mode (burner stage 2), the feed/heating circuit pump does not regulate below this set value.
This parameter has no function if a feed/heating circuit pump with no PWM signal control is used.
7.2.11

HG19: Run-on time, cylinder primary pump

Summer mode
After completing cylinder heating (when 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 heat generator water
temperature cools down to a differential of 5 K between the set heat generator temperature and set
cylinder temperature.
Winter mode
The HG19 parameter is ignored. The cylinder primary pump will continue to run for 90 seconds after
cylinder heating is complete.
7.2.12

HG20: Max. cylinder heating time

Cylinder heating commences as soon as the cylinder temperature sensor calls for heat. The heating
circuit pumps would be constantly off if the heat generator were undersized, the cylinder were scaled up
(limescale) or if DHW were constantly drawn off during DHW priority mode. The accommodation would
then cool down significantly. To limit this effect, it is possible to specify a max. cylinder heating time.
If the set maximum cylinder heating time has expired, error message FC52 appears on the control
module.
The control unit reverts to heating mode and cycles in the selected rhythm (HG20) between heating and
cylinder heating mode, regardless of whether the cylinder has reached its set temperature or not.
The function "Max. cylinder heating time" function remains active even if parallel pump operation is
enabled. If HG20 is set to OFF, the "Max. cyl. heat time" function is disabled. Set HG20 to OFF in heating
systems with high DHW consumption, e.g. hotels, sports facilities, etc.
7.2.13

HG21: Minimum boiler temperature BTmin

The control unit is equipped with an electronic boiler temperature controller which has an adjustable
minimum start 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 BTmin is also not necessarily
achieved when there is no heat demand.
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