Viessmann VD2 Series Technical Information download pdf (Page 43)

Output [20][A1]/[M1]

Switched Output [20][A1]/[M1]: Dry Contact Control Signal

Section 3.5.2

Control Overview Section 3.5

Section 3.5

Control Output Drawings

Output [20][M2] and [M3]

Heat Circuit Pump [20][M2] and [20][M3]: 120VAC Output

Heat Circuit Pump [20][M2] and [20][M3]: Contactor

Heat Circuit Pump [20][M2] and [20][M3]: Dry Contact Control Signal

Section 3.5.1

Output [28] and [21]

DHW Recirculation [28] and DHW Pump [21]: 120VAC Output

DHW Recirculation [28] and DHW Pump [21]: Contactor

DHW Recirculation [28] and DHW Pump [21]: Dry Contact Control Signal

Section 3.5.3

Output [29]

Shunt Pump [29]: 120VAC Output

Shunt Pump [29]: Contactor

Shunt Pump [29]: Dry Contact Control Signal

Boiler Pump [29]: 120VAC Output

Boiler Pump [29]: Contactor

Boiler Pump [29]: Dry Contact Control Signal

Section 3.5.4

Output [50]

Compiled Alarm Output [50]: 120VAC Output

Compiled Alarm Output [50]: Dry Contact Control Signal

Section 3.5.5

Adapter Modules

Valve Adapter Module—24VAC/120VAC

Combustion Air Device Adapter Module—Blower/Fan Single Boiler

Combustion Air Device Adaptor Module—Damper (spring close) Single

Boiler

Combustion Air Device Adaptor Module—Damper (power open/close) Single

Boiler

Common Combustion Air Device Interface—System Overview

Common Combustion Air Device Interface—System Boiler Connections

Common Combustion Air Device Interface—Overview

Common Combustion Air Device Interface—System Blower/Damper

Common Combustion Air Device Interface—Damper Power Open/Close

Section 3.5.6

5346540 v1.0 09/2006 Technical information subject to change without notice

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Viessmann VD2 Series Technical Information Page 43