Wolf COB Installation Instructions And Technical Manual page 31

Maximum boiler water
temperature TK-max.
Parameter HG22
HG22
80
Factory setting: 80 °C
Setting range: 50 to 90 °C
Boiler overtemperature during
cylinder heating
Parameter HG25
HG25
10
Factory setting: 10 K
Setting range: 0 to 40 K
Burner operating mode
Parameter HG28
HG28
2
Factory setting: 2
Setting range: 1 to 5
Blocking time burner stage 2
Parameter HG31
HG31
10
Factory setting: 4 min
Setting range: 0 to 10 min
3062547_201507
19. Contractor level parameters
The control unit is equipped with an electronic boiler thermostat which has an adjustable
maximum shutdown temperature (maximum boiler water temperature). The burner is
switched off if this temperature is exceeded. The burner will be started again when the
boiler water temperature has fallen by as much as the burner switching differential.
If the boiler water temperature exceeds 95 °C (possible effect of reheating), the boiler
circuit pump and cylinder primary pump (if installed) will also be started in "summer
mode". These pumps are stopped again when the boiler water temperature falls
below 92 °C. This prevents the boiler overheating.
The excess temperature differential between the cylinder temperature and the boiler
water temperature during cylinder heating is selected with parameter HG25. The boiler
water temperature continues to be limited by the maximum boiler water temperature
(parameter HG22). This ensures that, even in spring and autumn, the boiler water
temperature is higher than the cylinder temperature, thereby ensuring short heating
times.
You can select any burner operating mode. Control unit is set at the factory for
two-stage burner operation.
Setting "1": single stage burner operation, stage 1
Setting "2": two-stage burner operation, stages 1 + 2
Setting "3": single stage burner operation during cylinder heating
two-stage burner operation in heating mode
Setting „4": Burner single-stage in heating mode
Burner 2-stage during calorifier charging
Setting „5": Burner 2-stage in heating mode, anti-short cycle in accordance
with parameter HG09
Burner 2-stage during calorifier charging. The burner is
blocked for 4 minutes after every burner stop, during calorifier
charging mode. This setting ensures an optimized burner
running period and prevents a restart after the
subsequent ventilation period with low calorifer capacity.
Burner stage 2 is started when there is stage 2 demand and after the blocking period
has expired (factory setting 4 min). It is stopped once a temperature of approx. 5 °K
above the set value has been reached. Once the stage 2 has been enabled, it will be
started as soon as the set temperature has been reached or is no longer achieved.
Enabling is removed when burner stage 1 is shut down.
During cylinder heating and emissions test mode, this parameter is disabled.
Burner
OFF
Set value
Blocking period, factory setting 10 min
Burner stage 1 Burner stage 2
Demand
stage 2
Burner Burner Burner Burner
stage 1 stage 2 stage 1 OFF
Time
31