Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
6 Operation
83311002 1/2018-03 La
48-132
6.7 Control options
6.7.1 Constant flow temperature
No additional sensors or thermostats are required for this control.
The flow temperature is controlled at the value set in the user level [ch. 6.2.2].
A timer is required to carry out a time-controlled switch-over between normal and
setback temperature.
6.7.2 Weather compensated control
An external sensor (NTC 600) is required for weather compensated control.
Mount the external sensor to the north side or the north-west side of the build-
ing, half way up (min 2.5 m).
Avoid direct solar radiation and heat up by external heat sources.
If necessary carry out a temperature adjustment of the external sensor via para-
meter
20
.
If a remote control station (WCM-FS) is connected, the settings for the temperat-
ure control are undertaken via the remote control station (see user manual
WCM-FS).
The current flow temperature is calculated from the:
average and current external temperature,
gradient (parameter
22
),
room setpoint temperature.
A higher flow temperature is required to achieve the desired room temperature,
when external temperatures are lower. The gradient determines how much the
change in external temperature affects the flow setpoint temperature and adjusts
the heating curve to the building.
Room temperature too cold
Room temperature too warm
Cold external temperature
Increase gradient.
Decrease gradient.
Mild external temperature
Increase normal and setback room
temperature.
Reduce normal and setback room
temperature.
15
10
9
7
5
4
6
8
9,5
12,5
3
40
20
17,5
22,5
25
30 27,5
35
2,5
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
30
40
50
60
80
90
20
70
1
2
3
1
External temperature [°C]
2
Flow temperature [°C]
3
Gradient (at normal room temperature 20 °C)
