Viessmann VITODENS 300-W, Service Manual

Page: 56 / 124

Parameter ad-
dress b5:... With heating circuit pump logic function: Heating cir-
cuit pump OFF, if
1: enabled RT
actual
> RT
set
+ 5 K; disabled RT
actual
< RT
set
+ 4 K
2: enabled RT
actual
> RT
set
+ 4 K; disabled RT
actual
< RT
set
+ 3 K
3: enabled RT
actual
> RT
set
+ 3 K; disabled RT
actual
< RT
set
+ 2 K
4: enabled RT
actual
> RT
set
+ 2 K; disabled RT
actual
< RT
set
+ 1 K
5: enabled RT
actual
> RT
set
+ 1 K; disabled RT
actual
< RT
set
6: enabled RT
actual
> RT
set
; disabled RT
actual
< RT
set
- 1 K
7: enabled RT
actual
> RT
set
- 1 K; disabled RT
actual
< RT
set
- 2 K
8: enabled RT
actual
> RT
set
- 2 K; disabled RT
actual
< RT
set
- 3 K
Coding in the delivered condition Possible change
Boiler circuit, mixer circuit
C5:20 Electronic minimum
flow temperature limit
20 °C (only for weather-
compensated control
units) C5:1
to
C5:127 Minimum temperature
limit adjustable from 1 to
127 °C (limited by boiler-
specific parameters)
C6:74 Electronic maximum
flow temperature limit
74 °C (only for weather-
compensated control
units) C6:10
to
C6:127 Maximum temperature
limit adjustable from 10 to
127 °C (limited by boiler-
specific parameters)
d3:14 Heating curve slope =
1.4 (only for weather-
compensated control
units) d3:2
to
d3:35 Heating curve slope ad-
justable from 0.2 to 3.5
(see page 29)
d4:0 Heating curve level = 0
(only for weather-com-
pensated control units) d4: – 13
to
d4:40
Heating curve level ad-
justable from
– 13 to 40
(see page 29)
d5:0 The external heating
program changeover al-
ters the heating pro-
gram to "Constant
operation with reduced
room temperature"
(only for weather-com-
pensated control units) d5:1 The external operating
mode changeover alters
to "Constant central heat-
ing with standard room
temperature"
Code 2
(cont.)
56
Coding
5692
673
GB