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7
7.2 External temperature dependent flow temperature control
An external sensor QAC 31is required for this variation.
The sensor should be fitted to a north or northwest
facing wall.
Avoid the following unfavourable factors:
•
Direct exposure to the sun.
•
Installation below a balcony, eaves or similar
•
Extraneous heat sources (chimney, through windows,
through ventilation openings).
•
Do not paint sensor housing.
Note:
If day/night time change-over is required to
comply with local regulation, a digital clock
(WCM-DU) is required for this regulating
variation.
The temperature measured by the external sensor is
averaged over time by a mathematical function
(
reset the average determination see Ch. 6.3.2).
The current flow temperature is calculated under
consideration of the type of building (
level P21) and the gradient set (
P22)(see diagram heating reference line).
The room temperature setpoint, adjustable in the end
user level, is also considered (see diagram influence
room temperature setpoint).
If using an inbuilt digital clock (WCM-DU) different room
temperature setpoints are possible for day/night.
When fitting a WCM remote control FB
(accessory) the setting of the room temperature
setpoints is carried out by remote control.
(
see installation and operating manual WCM-FB).
Parameter setting:
P15 = 1
(when using a digital clock)
P20 = -4...0...4 (Temp. correction external sensor)
P21 = 0/1
(Evaluation building)
P22 = 12.5
(Heating reference line gradient
for radiator heating circuit)
= 8
(Heating reference line gradient
for underfloor heating circuit)
50
heating engineer
heating engineer level
Installation example
H
ca 1/2 H
min. 2,5m
Diagram heating reference line
T
[°C]
35
35
30
27,5
VL
90
80
70
60
50
40
30
20
20
15
10
5
0
-5
with room setpoint T = 20 [°C]
Diagram influence room temperature setpoint
T
[°C]
VL
90
80
70
60
50
40
30
20
20
15
10
5
0
-5
with gradient =12.5
25
22,5
20
17,5
-10
-15
-20
-25
-30
-35
Rtset 15°C
Rtset 20°C
Rtset 22°C
Rtset 24°C
-10
-15
-20
-25
-30
-35
15
12,5
10
9,5
9
8
7
6
5
4
3
2,5
T
[°C]
A
T
[°C]
A
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