6 720 820 872 (2016/12)
CR 400 | CW 400 | CW 800
30 | Service menu
Minimum outside temperature
The minimum outside temperature is the average value of each
of the coldest outside temperatures or recent years, and it has
an influence on the heating curve. The value for the region can
be taken from the required heat load calculation that should be
done for every building or from the climate zone chart or from
Tab. 12.
▶ Set the minimum outside design temperature for the
heating system.
Type of building
If damping is activated, the adjustment of the outside
temperature fluctuations can be set with the building type.
By adjusting the outside temperature thermal inertia of the
building mass is taken into account. Thus, by setting the
building type the control can be adapted to suit the
characteristics of the building.
The building type also affects the quick heat-up.
Fig. 20
Example for adjusted outside temperature:
[1]
current outside temperature
[2]
adjusted outside temperature
This greatly simplified example shows how the adjusted
outside temperature follows the current outside temperature,
but does not reach its extreme values.
The current values of the adjusted and the measured outside
temperature
Location
Minimum outside temperature in °C
Brisbane
4
Canton
15
Chongqing
3
Hong Kong
6
Melbourne
0
Shanghai
– 1
Sydney
5
Table 12 Minimum outside temperatures
Adjustment Type
Effect
Light
for example prefabricated building,
wood-frame construction
•
low adjustment of the outside temperature
•
short excess of the flow temperature in case of quick heat-up.
Medium
for example house made of hollow
blocks (default setting)
•
medium adjustment of the outside temperature
•
excess of the flow temperature with quick heat-up of medium duration.
Heavy
for example brick house
•
high adjustment of the outside temperature
•
long excess of the flow temperature in case of quick heat-up.
Table 13 Building types
6720 645 480-30.1O
2
1
0°C
20°C
0 h
12 h
24 h
In the default setting any changes in the outside
temperature have an effect after a delay of three
hours at the latest on the calculation of the
weather-compensated control.
▶ To monitor the adjusted and the measured
outside temperature: open the
Diagnosis
>
Monitored values
>
Boiler /
burner
menu (only current values).
▶ To view the course of the outside
temperature of the last 2 days: open the
Info
>
Room and outdoor temp.
>
Outdoor temp. curve
menu
Summary of Contents for CR 400
Page 63: ...6 720 820 872 2016 12 CR 400 CW 400 CW 800 63 Notes ...
Page 64: ......
