Vitodens 200-W, B2HB 19 to 35 Technical Data
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5461 883 - 02
Overview of Electrical Connections, Models B2HB 19, 26 and 35
(continued)
Wiring Diagram
A
Boiler Control
B
External Accessory Connection Board
C
Pump Connection Interface
D
Extension Module EA1
E
KM-BUS for External Devices
F
Electrical Junction Box
G
Field Wiring Connections
A1 Main Board
A2 Internal Power Supply Unit
A3 Optolink
A4 Burner Control Unit
A5 Programming Unit
A6 Coding Card
A7 Connection Adaptor
A8 LON Communication Module
S1 ON/OFF Switch
S2 Reset Button
X.. Electrical Interface
Legend
1
Outdoor Temperature Sensor
2
Supply Temperature Sensor/Low Loss Header
3
Boiler Temperature Sensor
5
DHW Temperature Sensor
11
Ionization Electrode
15
Flue Gas temperature Sensor
20
Boiler Pump
21
DHW Pump
[21]
Pump Output Connection
28/20 Programmable Pump Output*
33
Flow Switch
35
Gas Valve
40
Power Supply
40A
Accessory Power Output
47 Fixed High Limit
[53]
Powered Accessory Connection
54
Ignition Transformer
96
Powered Accessory Connection
100
Fan Motor
100A Fan Motor Control
111
Not Used
145 KM BUS
Multi
Powered Accessory Connection
156A Switched Output F2
156B Switched Output F1
DE1
Digital Input 1 (Dry Contact)
DE2
Digital Input 2 (Dry Contact)
DE3
Digital Input 3 (Dry Contact)
0-10V 0-10VDC Input
157
Fault Alarm/DHW Recirc. Pump*
190
Gas Modulation Coil
* See wiring diagram