Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
6 Operation
83311002 1/2018-03 La
49-132
A change in the normal room temperature or setback room temperature by 1 °C
leads to a parallel translation of the heating characteristic by approx. 1.5 … 2.5 °C.
Example:
at gradient 10
20
15
22
24
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
30
40
50
60
80
20
70
1
2
3
1
External temperature [°C]
2
Flow temperature [°C] at gradient 10
3
Normal and setback room temperature [°C]
A timer is required to carry out a time-controlled switch-over between normal room
temperature and setback room temperature.
6.7.3 DHW operation
The DHW operation takes priority over heating operation.
DHW preparation is carried out when the temperature in the water heater drops
below the DHW setpoint value minus switch differential (parameter
51
).
A setback level can be set for the DHW temperature via the deduction value (para-
meter
53
), this requires a timer.
The maximum DHW operating time can be set via parameter
52
.
For version H, an external three-way valve and a hot water load pump can be con-
nected via outputs MFA1, MFA2 and VA1.
The DHW sensor is connected to input B3.
