Viessmann VITOLIGNO 300-P Service Instructions Manual page 56

Codes
Code 1
(cont.)
Coding in the delivered condition
Buffer HC ON
34:5 Only for systems with a
heating water buffer cyl-
inder and code "BB:1",
the following must be
selected:
Enabling heating circuit
pumps (see following
example)
Buffer HC OFF
35:20 Only for systems with a
heating water buffer cyl-
inder and code "BB:1",
the following must be
selected:
Disabling heating circuit
pumps; works with
address "34" (see follow-
ing example)
■ Enabling the heating circuit pumps:
The buffer cylinder temperature (top sensor) has risen to the value of the set buffer
temperature less the value set at coding address "35".
■ Disabling the heating circuit pumps:
The buffer cylinder temperature (top sensor) has fallen to the value of the set buffer
temperature less the total of the values set at coding addresses "34" and "35".
Example:
Codes "34:5" and "35:20", buffer set value 50 °C
Enable: 50 − 20 = 30, i.e. at a buffer cylinder temperature (top sensor) of 30 °C,
the heating circuit pumps are enabled.
Disable: 50 − (20 + 5)= 25, i.e. at a buffer cylinder temperature (top sensor) of
25 °C, the heating circuit pumps are disabled.
56
Possible change
34:0 Value adjustable from 0 to
to 20 K
34:20
35:0 Value adjustable from 0 to
to 30 K
35:30