Adjusting The Heating Curves (Only For Weather-Compensated Control Units) - Viessmann Vitodens 200-W Installation And Service Instructions For Contractors

Matching the control unit to the heating system
Function/system components
System without DHW circulation pump:
Heating circuit pump A1 connected at internal extension H1 or H2
System with DHW circulation pump:
Heating circuit pump A1 connection at extension AM1, terminal A1
DHW circulation pump connection at extension AM1, terminal A2
System with low loss header

Adjusting the heating curves (only for weather-compensated control units)

The heating curves illustrate the relationship between
the outside temperature and the boiler water or flow
temperature.
To put it simply, the lower the outside temperature, the
higher the boiler water or flow temperature.
The boiler water or flow temperature in turn affects the
room temperature.
Settings in the delivered condition:
Slope = 1.4
■
Level = 0
■
90
80
70
60
50
40
30
10
Fig. 35
Slope setting ranges:
Underfloor heating systems: 0.2 to 0.8
■
Low temperature heating systems: 0.8 to 1.6
■
Selecting the set room temperature
Individually adjustable for each heating circuit.
The heating curve is offset along the axis of the set
room temperature. With the heating circuit pump logic
function enabled, the curve modifies the starting and
stopping characteristics of the heating circuit pump.
Slope
5 0 -5 -10 -15 -20
Outside temperature in °C
Commissioning, inspection, maintenance
(cont.)
Note
If the heating system includes heating circuits with mix-
ers, then the flow temperature of the heating circuit
without mixer is higher by a selected differential (8 K in
the delivered condition) than the flow temperature of
the heating circuits with mixers.
The differential temperature is adjustable via coding
address "9F" in the "General" group.
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-25 -30
Code
Set Group
53:2 "General"
—
—
04:0 "Boiler"
—
—
39