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18. Electrical connection
Connection, outside temperature sensor
The outside temperature sensor can only be connected to the
terminal strip of the AF condensing boiler connection or the
terminal strip of the control accessories, provided a BM2
programming module has been fitted.
Fig: Connection, outside temperature sensor
When installing the appliance in places where
there is a risk of high electromagnetic
interference, it is advisable to fit shielded
sensor and eBUS cables. The cable shield
should be connected at one end to the PE
potential in the control unit.
Caution
Connection, digital Wolf control accessories
(e.g. TM2, MM, KM, SM1, SM2)
Only connect control units from the Wolf accessory range.
Each accessory is supplied with its own connection diagram.
Use a two-core cable (cross-section > 0.5 mm²) as the
connecting cable between the control unit accessory and the
condensing boiler.
Fig: Digital Wolf control accessories connection (eBUS interface)
When installing the appliance in places where
there is a risk of high electromagnetic
interference, it is advisable to fit shielded
sensor and eBUS cables. The cable shield
should be connected at one end to the PE
potential in the control unit.
Caution
Low voltage boiler connection:
Connection input E2
Insert and secure the connecting cable through the cable
gland. Connect the connection cable for input 2 to terminals
E2 as shown in the wiring diagram.
Fig: Connection input E2
Only one external voltage of max. 10 V can
be connected to input E2, otherwise the
control PCB will be destroyed. 1(a) = 10 V,
2(b) = GND
Caution
F1
PE
N
L3
L2
L1
PE
N
L3
L2
L1
3
2
1
5
4
K1
K2
220V/
400V
Fig: Connection of external safety circuit
External
safety circuit
floating
contact
(jumper)
X2
Installing the electrical connection of the external safety
circuit
An external safety circuit (e.g. maximum pressure limiter)
can be connected to the floating contact.
Lockout for as long as the contact is open.
- Isolate the system from the power supply before opening.
- Check that the appliance is isolated from the power supply.
- Open the front casing and the cover of the control unit.
- Open the upper cable conduit and the lower casing cover of the
HCM-2.
- Remove the jumper at terminals X2-4 and X2-5.
- Push the potential-free connecting cable of the external component
through the strain relief on the right-hand side of the appliance and
lay it in the lower cable conduit to the series terminals X2.
- Ensure separation of the LV and ELV side.
- Terminate wires accordingly at terminals X2-4 and X2-5.
- Close the cable conduits and the cover of the control unit.
