Viessmann Vitocrossal 300 Series Technical Data Manual page 29

Vitocrossal 300 CU3A 26 to 199 Technical Data
Electrical Connections
Legend
1 Outdoor Temperature Sensor
2 Supply Temperature Sensor/Low Loss Header
3/1 Boiler Temperature Sensor #1
3/2 Boiler Temperature Sensor #2
5 DHW Temperature Sensor
11 Ionization Electrode
15 Flue Gas temperature Sensor
20 Boiler Pump
21 DHW Pump
28/20 Programmable Pump Output / zone circuit pump
output*
35 Gas Valve
40 Power Supply
40A Accessory Power Output
54 Ignition Transformer
96 Powered Accessory Connection
100 Fan Motor
100A Fan Motor Control
111 Not Used
145 KM BUS
147 Pump Modulation Output 0-10VDC
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 Recirculation Pump / zone
circuit pump output*
190 Gas Modulation Coil
* See wiring diagram
Boiler Control
A
External Accessory Connection Board
B
Power/Pump Connection Interface
C
Integrate EA1 Module
D
KM-BUS for External Devices
E
Electrical Junction Box
F
Field Wiring Connections
G
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
(continued)
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.
Wiring
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