Viessmann Vitoligno 300-P Service Instructions For Contractors page 46

Codes
Code 1
(cont.)
Coding in the delivered condition
Buffer HC OFF
35:20 Only for systems with a
heating water buffer cyl-
inder and code "BB:1" the
following must be selec-
ted:
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 flow
temperature less the value set at coding address "34".
■ Disabling the heating circuit pumps:
The buffer cylinder temperature (top sensor) has fallen to the value of the set flow
temperature less the total of the values set at coding addresses "34" and "35".
Example:
Codes "34:5" and "35:20", set flow temperature 50 °C
Enable: 50 − 5 = 45, i.e. at a buffer cylinder temperature (top sensor) of 45 °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.
Coding in the delivered condition
Buffer cylinder
45:0 Without heating water
buffer cylinder.
Set HC shutdown
A5:5 With heating circuit pump
logic function
46
Possible change
35:0 Value adjustable from 0 to
to 30 K.
35:30
Possible change
45:1 With heating water buffer
cylinder
45:2 With heating water buffer
cylinder with integral DHW
heating (combi cylinder).
(Observe coding address
"61").
A5:0 Without heating circuit
pump logic function
A5:1 With heating circuit pump
to logic function:
A5:15 Heating circuit pump
"OFF" (see the following
table)