Viessmann Type B2HA Operations Instructions download pdf (Page 143)

143

Internal extension H2

The internal extension is integrated into

the control unit casing. The following

alternative functions can be connected

to relay output

. The function is

assigned via coding address "53" in

group "General":

■ Central fault message (code "53:0")

■ DHW circulation pump (code "53:1")

(only for weather-compensated oper-

ation)

■ Heating circuit pump for heating circuit

without mixer (code "53:2")

■ Circulation pump for cylinder heating

(code 53:3)

An extractor fan can be switched off via

connection

aBJ

when the burner starts.

Function description

Internal extensions (accessories)

(cont.)

5772 909 GB

Service

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Viessmann Type B2HA Operations Instructions Page 143