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5773 597 - 04
Vitocrossal 200, CM2 400, 500 and 620 Installation
Electrical Connections
1. Route the burner cables to the burner; apply strain
reliefs or cable connectors as required.
2. Plug burner cable 41 and KM BUS cable 145 into
the burner control unit.
3. Plug control unit connecting cable 40/156, boiler
sensor
leads
3 A/ 3 B, flue gas sensor lead 15A/15B
and power cable 40 into the couplings on the
mounting plate on the burner side.
4. Plug control unit connecting cable 40/156, 41 and
KM BUS cable 145 into the corresponding
connections of the Vitotronic control..
Note:
For details of lead and cable routing see page 23.
3 A/ 3 B Boiler water temperature sensor
15A/15B Flue gas temperature sensor
40 Power cable to junction box
40/156 Vitotronic power supply
41 Burner cable to Vitotronic control
53 Rotary vent damper connection
(optional accessory not used)
145 KM BUS cable to Vitotronic control
Note:
Never allow cables or leads to come into contact
with hot components. Secure all cables and leads
with cable ties.
Boiler
Note:
Route 120V cables and low voltage leads separately.
Connect power cable with plug 40 to the power supply.
Boiler Power Supply
WARNING
Incorrect core allocation can result in serious injury
and damage to the appliance. Never interchange cores
“L1”, “L2” and “N”.
Legend
A
Burner control unit
B
Vitotronic control
C
Mounting plate with mains filter
D
Power supply (cable with plug 40)
E
Connecting cable 40/156
