Viessmann CU3A, Service Instructions For Contractors, Page: 62 / 148

62
Parameter address
A5:... With heating circuit pump logic function: Heating cir-
cuit pump "Off"
1 AT > RT
set
+ 5 K
2 AT > RT
set
+ 4 K
3 AT > RT
set
+ 3 K
4 AT > RT
set
+ 2 K
5 AT > RT
set
+ 1 K
6 AT > RT
set
7
to AT > RT
set
- 1 K
15 AT > RT
set
- 9 K
Coding in the delivered condition Possible change
Summer eco function absolute
A6:36 Extended economy mode
disabled
A6:5
to
A6:35 Extended economy control
enabled, i.e. the burner and
heating circuit pump will be
stopped and the mixer
closed at a variable value,
adjustable between 5 and
35 °C plus 1 °C. The base
value is the adjusted out-
side temperature. This
value is based on the
actual outside temperature
and a time constant that
takes the cooling down of
an average building into
consideration.
Code 1
Heating circuit 1, heating circuit 2, heating…
(cont.)
5692 860 GB