Viessmann Vitodens 200-W B2HA 88 Technical Data Manual page 50

Wiring Diagram
Overview of Electrical Connections, Models B2HA 112, 150, 399, 530
Legend
1 Outdoor Temperature Sensor
2 Supply Temperature Sensor/Low Loss Header
3 Boiler Temperature Sensor/High Limit Sensor
3A Boiler Temperature Sensor/High Limit 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 / zone circuit pump
output*
35 Gas Valve
40 Power Supply
40A Accessory Power Output
[53] Powered Accessory Connection
54 Ignition Transformer
96 Powered Accessory Connection
100 Fan Motor
100A Fan Motor Control
111 Low and High Pressure Gas Switches
145 KM BUS
Multi Powered Accessory Connection
156A Switched Output F2
156B Switched Output F1
DE1 Digital Input 1 (Dry Contact)
Digital Input 2 (Dry Contact)
DE2
Digital Input 3 (Dry Contact)
DE3
0-10V 0-10VDC Input
157 Fault Alarm/DHW Recirc. Pump / zone circuit
pump output*
190
Gas Modulation Coil
F
Flow Sensor
* See 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
50
Vitodens 200-W B2HA 88-150, 311- 530 Technical Data
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.
(continued)