Wolf CGB-75 Installation And Operating Instructions Manual page 26

Connecting low voltage devices
When installing the appliance in places
Note
where there is a risk of increased electro-
magnetic interference, it is advisable to fit
screened sensor leads and eBUS cables.
The cable shield should be connected at
one end to the PE potential in the control
unit.
Connection, input E1 (24 V), potential-free
Connect the cable for input 1 at terminals E1 in accordance
with the wiring diagram; first remove the jumper between a
and b from the respective terminals.
No external voltage may be connected to in-
Note
put E1, as this could destroy the component.
The functions of input E1 can be scanned and adjusted with eBUS-enabled Wolf control accessories. The following functions
can be allocated to input E1:
Code Meaning
0 No function
Input E1 is not taken into consideration by the control unit
1 Room thermostat (factory setting)
With open input E1, heating operation will be blocked (summer mode), independent of any digital Wolf control
accessories.
2 Maximum thermostat, system pressure switch or condensate lifting system
Connection option for a maximum thermostat, system pressure switch or condensate lifting system. To enable the
burner, input E1 must be closed. When the contact is open, the burner is blocked both for DHW and heating, as
well as for emissions tests and frost protection.
3 Not assigned
4 Flow switch
Optional connection for an additional water flow switch.
input E1 must be closed within 12 seconds after the pump has been switched. Where this is not the case, the
burner will be switched OFF, and fault 41 will be displayed.
5 Ventilation air damper monitoring
See parameters for output A1, no. 7. Supply air damper
Burner block (BOB)
8
Operation without burner
Closed contact, burner blocked
Heating circuit pump and cylinder charging pump operate in standard mode
In emissions test mode and frost protection the burner is enabled
Open contact enables the burner again
26
12. Electrical connection
Fig.: Connection, room thermostat
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