Viessmann Vitocrossal 300 Service Instructions For Contractors page 88

Code 2
Heating circuit 1, heating circuit 2, heating...
Parameter With heating circuit pump logic function:
address b5:... Heating circuit pump "Off"
6 RT
7 RT
8 RT
Coding in the delivered condition
C5:20 Electronic minimum flow
temperature limit 20 °C
C6:74 Electronic maximum flow
temperature limit set to
90 °C
d3:14 Heating curve slope =
1.4
d4:0 Heating curve level = 0
d5:0 External heating program
changeover changes to
"Constant operation with
reduced room tempera-
ture" or "Standby mode"
d6:0 Heating circuit pump
stays in control mode at
signal "External block-
ing"
d7:0 Heating circuit pump
stays in control mode at
signal "External
demand"
88
> RT
actual set
> RT - 1 K
actual set
> RT - 2 K
actual set
Heating circuit pump "On"
RT < RT
actual
RT < RT
actual
RT < RT
actual
Possible change
C5:1 Minimum limit adjustable
to from 1 to 127 °C (limited by
C5:127 boiler-specific parameters)
C6:10 Maximum limit adjustable
to from 10 to 127 °C (limited
C6:127 by boiler-specific parame-
ters)
d3:2 Heating curve slope adjust-
to able from 0.2 to 3.5 (see
d3:35 page 49)
d4:–13 Heating curve level adjust-
to able from –13 to 40 (see
d4:40 page 49)
d5:1 The external heating pro-
gram changeover changes
to "Constant operation with
standard room tempera-
ture" (subject to coding
address 3A, 3b and 3C)
d6:1 Heating circuit pump stops
at signal "External block-
ing" (subject to coding
addresses 3A, 3b and 3C)
d6:2 Heating circuit pump starts
at signal "External block-
ing" (subject to coding
addresses 3A, 3b and 3C)
d7:1 Heating circuit pump stops
at signal "External
demand" (subject to coding
addresses 3A, 3b and 3C)
d7:2 Heating circuit pump starts
at signal "External
demand" (subject to coding
addresses 3A, 3b and 3C)
(cont.)
- 1 K
set
- 2 K
set
- 3 K
set