Wolf CGU-2-18 Installation And Maintenance Instructions Manual page 25

Hydraulic scheme:
Boiler circuit pump run-on time
Parameter HG07
HG07
1
Factory setting: 1 min
Setting range: 0 to 30 min
Maximum limit
Boiler circuit TV-max.
Parameter HG08
HG08
80
Factory setting: 80 °C
Setting range: 40 to 90 °C
3062347_0309
Displaying / modifying control parameters
with Wolf control accessories
Pump operating mode 2:
Buffer cylinder primary pump
Boiler pump becomes the buffer primary pump.
The manifold sensor (buffer) only affects the heating operation. In case of DHW
heating, the reference temperature is provided by the internal boiler sensor.
The boiler pump will not run for a general heat demand, but rather only when
there is a burner demand in the heating operation, with pump run-on according
to pump run-on time.
With DHW demand (free standing cylinder, combi boiler, stratifi cation cylinder)
the heating circuit pump runs according to function.
Operation without manifold sensor:
Boiler pump only during burner operation; regulated by internal sensor.
Gas fi red boiler
VL Sensor 2
J
VL Sensor 1
J
Three-way valve
Subject to there being no heat demand from the heating circuits, the boiler
circuit pump will run-on in accordance with the set time, to prevent a boiler
safety shutdown at high temperatures.
This function limits the boiler water temperature upwards in heating mode, and
the burner shuts down. This parameter has no function during cylinder heating,
and the boiler water temperature may also be higher during this time. "Reheating
effects" can result in the temperature being exceeded a little.
Manifold
Boiler
sensor E1
pump
J
Cylinder
J
sensor
Buffer
A1 as heating
circuit pump
DHW cylinder
25