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With boilers CGU-2 / CGG-2 there are 3 possible boiler versions.
Legend
Boiler
A
B
Combination
boiler
A
B
E
Boiler with cylinder
A
B
Reset
Press reset button
ON / OFF switch
3062347_0309
DHW connection versions /
Resetting control unit
C
D
C
D
C
D
F
Observe the following steps to implement a reset:
- The operating mode switch must be set to O (OFF).
- Press the reset button on the control unit and hold it down.
- Switch on ON/OFF switch in I position.
- After 5 seconds the signal ring will illuminate and flash yellow/green and
red every 1 second.
- Then release the reset button again.
All parameters (individual settings) are returned to their factory
Note
settings by a reset, except for gas type settings and adjustments
to pipe lengths.
A
VL sensor 2
B
VL sensor 1
C
Boiler pump
D
Three-way valve
E
Flow rate sensor
F
Cylinder sensor
The DHW circuit is bridged and is not used
When drawing DHW the flow rate sensor
recognises the DHW demand. The burner is
fired-up and regulated to the set DHW outlet
temperature (adjusted via rotary selector or
control accessories)
When drawing DHW, the temperature
falls below the set DHW temperature. The
burner fires up and regulates the boiler flow
temperature and boiler excess temperature
when preparing DHW
31
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