Viessmann VITOLIGNO 300-P Service Instructions Manual page 64

Codes
Code 2
(cont.)
Coding in the delivered condition
Start point for output
reduction; works with
address "31" (see follow-
ing example)
31:5 Only in systems without a
heating water buffer cyl-
inder and code "AA:2",
the following 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 sum of coding
addresses "30" and "31".
Example:
Codes "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 steadily reduced at boiler water temperatures between 45 °C and
55 °C.
Coding in the delivered condition
32:0 Only in systems without a
heating water buffer cyl-
inder and code "AA:2",
the following must be
selected: No greater
(more pronounced) out-
put reduction
64
Possible change
31:0 Value adjustable from 0 to
to 20 K
31:20
Possible change
32:10 Value adjustable from 10 to
to 100 K x min.
For a greater output reduc-
tion, set a low value.