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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Wiring Diagram (continued)
Control Connections
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
4 DHW Supply Temperature Sensor
5 DHW Tank Temperature Sensor
11 Ionization Electrode
15 Flue Gas Temperature Sensor
20 No Function
[20] Boiler Pump Connection (Internal)
21 No Function
[21] DHW Pump Connection (Internal)
28/20 Heat Circuit A1 Pump Connection / zone circuit
pump output*
30 Diverting Valve Stepper Motor
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 / zone circuit
pump output*
190 Gas Modulation Coil
* Only one function/connection may be assigned
to each connection.
IMPORTANT
Electrical installations must comply with the latest edition of:
In the U.S.A., the National Electrical Code (NEC),
ANSI/NFPA 70 and any other state, local codes and/or
regulations.
In Canada, the Canadian Electrical Code (CEC),
CSA C22.1 Part 1 and any other province, territory,
local codes and/or regulations.
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