Hg22: Maximum Boiler Temperature Btmax; Hg23: Maximum Dhw Temperature; Hg25: Excess Boiler Water Temperature During Cylinder Heating; Hg28: Burner Operating Mode - Wolf COB-2 Operation Instructions Manual

Parameter settings
7.2.14

HG22: Maximum boiler temperature BTmax

The control unit is equipped with an electronic boiler temperature controller which has an adjustable
maximum shutdown temperature. The burner is switched off if this temperature is exceeded. The burner
is switched back on once the boiler temperature has decreased by the burner hysteresis.
Only for COB-2-29 with TS cylinder:
i
A BTmax of 85°C is recommended if the Pasteurisation function (A07) is active.
7.2.15

HG23: Maximum DHW temperature

The factory setting for the max. DHW temperature is 65°C. This temperature can be enabled at 80°C if,
for commercial reasons, a higher DHW temperature is required.
WARNING
Hot water!
Scalding.
► Implement suitable measures.
In order to enable higher DHW temperatures, system parameter A14 (maximum DHW temperature) must
also be set accordingly.
7.2.16

HG25: Excess boiler water temperature during cylinder heating

HG25 sets the excess temperature differential between the cylinder temperature and the heat generator
temperature during cylinder heating.
The boiler water temperature continues to be limited by the maximum boiler water temperature (HG22).
This ensures that, even in spring and autumn, the heat generator temperature is higher than the cylinder
temperature, thereby ensuring short heating times.
7.2.17

HG28: Burner operating mode

You can select any burner operating mode.
Setting
HTG 1 stage DHW 1 stage Single stage burner operation, stage 1
HTG 2 stage DHW 2 stage
(factory setting)
HTG 2 stage DHW 1 stage Burner is single stage for cylinder heating
HTG 1 stage DHW 2 stage Burner is single stage for heating mode
Table 7.4 HG28: Burner operating mode
7.2.18

HG33: Burner hysteresis runtime

When starting the burner or changing to heating mode, the burner hysteresis is set to HG01. Based on
this set value, the burner hysteresis within the configured burner hysteresis runtime (HG33) is reduced to
the minimum hysteresis (HG60). This is designed to prevent short burner runtimes.
7.2.19

HG34: eBus feed

In the "Auto" setting, the power supply to the eBus system is switched on or off automatically by the
control unit, depending on the number of available eBus subscribers.
Setting
OFF
ON
Auto
Table 7.5 HG34: eBus feed
62 | WOLF GmbH
Description
Two-stage burner operation, stages 1 + 2
Burner is two-stage for heating mode
Burner is two-stage for cylinder heating
Description
The bus feed is always off.
The bus feed is always on.
The control unit switches the bus feed on or off automatically.
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