Viessmann D2RA, Инструкция по установке для подрядчиков

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59
The control unit must be matched to the system equip-
ment level.
■ To do this, select the applicable system scheme.
"System examples"
■ Set the codes according to the accessories fitted:
Accessories installation and service instruc-
tions
Note
Various system components are recognised automati-
cally by the control unit and the relevant codes are set
automatically.
For individual coding steps, see page 63.
Adjusting heating curves
The heating curves represent the relationship between
the outside temperature and the flow temperature.
Simplified: the lower the outside temperature, the
higher the flow temperature
The flow temperature in turn affects the room tempera-
ture.
Settings in the delivered condition:
■ Slope = 0.8
■ Level = 0
Note
If the heating system includes heating circuits with
mixer, then the flow temperature of the heating circuit
without mixer is higher by a selected differential (4 K in
the delivered condition) than the flow temperature of
the heating circuits with mixer.
The differential temperature is adjustable via coding
address "9F" in the
"General" group.
0.2
Outside temperature in °C
Flow temperature
in °C
Slope
2.4 2.6
2.8
3.0
3.2
3.4
90
80
70
60
50
40
30
0 -10 -20 10
2.0 2.2
35
30
25
20
15
10
5
0.4
0.6
0.8
1.0
1.2
-30
1.8 1.6
-14
1.4
B
A
Set room temperature
in °C
Fig. 46
Slope setting ranges:
A
Underfloor heating system: 0.2 to 0.8
B
Low temperature heating system: 0.8 to 1.6
Setting the set room temperature
Individually adjustable for each heating circuit.
The heating curve is offset along the set room temper-
ature axis. With the heating circuit pump logic function
enabled, the curve modifies the start and stop charac-
teristics of the heating circuit pump.
Commissioning, inspection, maintenance
Matching the control unit to the heating system
5678 044 GB