Viessmann D2RA, Installation Instructions For Contractors

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68
Coding in the delivered condition Possible change
Extended economy function adjusted outside temperature
A6:36 Extended economy mode not ac-
tive
A6:5
to
A6:35 Extended economy mode active, i.e.
the burner and heating circuit pump
are switched off at a variable value,
adjustable from 5 to 35 °C plus 1 °C.
Mixer is being closed. The basis for
this is the adjusted outside tempera-
ture. This is composed of the actual
outside temperature and a time con-
stant that takes account of the way
an average building cools down.
Extended economy function mixer
A7:0 Without mixer economy function
(only for heating circuit with mixer) A7:1 With mixer economy function (exten-
ded heating circuit pump logic):
Heating circuit pump also "OFF":
■
If the mixer has been trying to
close for longer than 20 min.
Heating circuit pump "ON":
■
If the mixer changes to control
function
■
If there is a risk of frost
Pump idle time, transition reduced mode
A9:7 With pump idle time: heating circuit
pump "OFF" if set value is modi-
fied by changing the operating
mode or changing the set room
temperature A9:0 Without pump idle time
A9:1
to
A9:15 With pump idle time, adjustable from
1 to 15: the higher the value, the lon-
ger the pump idle time.
Weather-compensated/room temperature hook-up
b0:0 With remote control: heating mode/
reduced mode: weather-compen-
sated, only change the code for
the heating circuit with mixer. b0:1 Heating mode: weather-compensa-
ted
Reduced mode: with room tempera-
ture hook-up
b0:2 Heating mode: with room tempera-
ture hook-up
Reduced mode: weather-compensa-
ted
b0:3 Heating mode/reduced mode: with
room temperature hook-up
Economy function room temperature
b5:0 With remote control: no room tem-
perature-dependent heating circuit
pump logic function. Change code
only for the heating circuit with
mixer. b5:1
to
b5:8 For heating circuit pump logic func-
tion, see the following table:
Parameter address
b5:... With heating circuit pump logic function:
Heating circuit pump "OFF"
Heating circuit pump "ON"
1 RT
actual
> RT
set
+ 5 K RT
actual
< RT
set
+ 4 K
2 RT
actual
> RT
set
+ 4 K RT
actual
< RT
set
+ 3 K
3 RT
actual
> RT
set
+ 3 K RT
actual
< RT
set
+ 2 K
4 RT
actual
> RT
set
+ 2 K RT
actual
< RT
set
+ 1 K
5 RT
actual
> RT
set
+ 1 K RT
actual
< RT
set
Code 1
"Heating circuit"
(cont.)
5678 044 GB
Codes