Viessmann Vitoligno 300-P Service Instructions For Contractors page 53

Code 2
(cont.)
Coding in the delivered condition
30:10 Only for systems without
a heating water buffer cyl-
inder and code "AA:2"
must be selected:
Start point for output
reduction; works with
address "31" (see follow-
ing example)
31:5 Only for systems without
a heating water buffer cyl-
inder and code "AA:2"
must be selected:
Start point for output
reduction (start-up con-
trol); works with address
"30" (see following exam-
ple)
Min. mixer position (see coding address "AB"), when the actual boiler water temper-
ature is lower than the minimum boiler water temperature by the cumulative values
of coding addresses "30" and "31".
Example:
Coding "30:10" and "31:5", minimum boiler water temperature 60 °C
60 − (10 + 5) = 45, i.e. at a boiler water temperature below 45 °C the output will be
reduced (start-up control) with mixer at min. position.
There will be no output reduction if the actual boiler water temperature exceeds the
minimum boiler water temperature less the value determined by coding address
"31":
60 − 5 = 55, i.e. at a boiler water temperature in excess of 55 °C.
Output will be constantly reduced at boiler water temperatures between 45 °C and
55 °C.
Possible change
30:5 Value adjustable from 5 to
to 30 K
30:30
31:0 Value adjustable from 0 to
to 20 K
31:20
Codes
53