Weishaupt WTC 45-A, Installation And Operating Instructions Manual

Page: 46 / 90

46
7
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 (
➩ heating engineer
level P21) and the gradient set ( ➩ heating engineer level
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 FS
(accessory) the setting of the room temperature
setpoints is carried out by remote control station.
(
➩
see installation and operating manual WCM-FS).
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)
35 30 25 20
15
10
9
7
5
4
6
8
9,5
12,5
3
27,5 22,5 17,5
90
80
70
60
50
40
30
20
35
2,5
20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35
Diagram heating reference line
90
80
70
60
50
40
30
20
20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35
Diagram influence room temperature setpoint
with room setpoint T = 20 [°C]
T
VL
[°C]
T
A
[°C]
T
A
[°C]
T
VL
[°C]
with gradient =12.5
Rtset 15°C
Rtset 20°C
Rtset 22°C
Rtset 24°C
Gradient
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)or WCM-FS is required for this
regulating variation.
H
ca 1/2 H
min. 2,5m
Installation example