Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
12 Technical documentation
83309302 1/2018-05 La
150-196
12.2 Control options
12.2.1 Constant flow temperature
No additional sensors or thermostats are required for this control.
The flow temperature from the heating circuit is controlled to the flow setpoint tem-
perature set in the user level, see [ch. 6.5.3].
Room frost protection and setting optimisation are not active.
12.2.2 Weather compensated control
The flow temperature is controlled depending on the external temperature.
An external sensor 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 at the external sensor.
Avoid heat up by external heat sources.
The current flow temperature setpoint is calculated from:
external temperature,
Heating curve:
Gradient
,
Parallel movement
,
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.
The heating curve can be moved vertically using the parallel movement.
Room temperature too cold
Room temperature too warm
Cold external temperature
Increase gradient.
Decrease gradient.
Mild external temperature
Increase room setpoint temperature
– or –
increase parallel movement.
Decrease room setpoint temperature
– or –
decrease parallel movement.
Depending on the type of heating circuit, a heating curve is automatically generated
[ch. 12.7.1].
The heating curve and the room setpoint temperature can be set in the user level
[ch. 6.5.3].
12.2.3 Room temperature dependent control
The flow temperature is controlled depending on the room temperature.
A room device or room sensor are required for room temperature dependent con-
trol.
Avoid direct solar radiation at the room sensor.
Avoid heat up by external heat sources.
The current flow temperature setpoint is calculated from:
room setpoint temperature,
current room temperature,
room sensor influence.
The room setpoint temperature can be set in the user level [ch. 6.5.3].
The room sensor influence can be set in the Engineer level [ch. 6.6.5.2].
