Ventilation control with CO
2
sensor (option)
In CO
2
sensor control, the ventilation unit adjusts fan speed so as to keep carbon dioxide
content in the ventilation zone below the setpoint. When two or more sensors are used,
fan speed is adjusted according to the highest measuring result.
1...5 CO
2
sensors can be connected to the unit. In this case the regulation of rotation speed
result from the highest measured value.
The adjustment is switched on / off and, if needed, the setpoint (500 2000 ppm) is set
at the control panel. The factory setting is 900 ppm. The recommended maximum carbon
dioxide content in good indoor air is 1,000 ppm.
When CO
2
sensor control is on, the control panel may be used to raise fan speed to
the maximum fan speed and to decrease it to the basic fan speed.
In CO
2
-sensor control, maximum fan speed limitation is enabled.
Ventilation control with humidity sensor (option)
There are two methods to adjust fan speed.
1.
Automatic humidity setting
, which is suitable for controlling humidity in washing rooms,
for instance. The program records current humidity level and selects it as the setpoint
which it then uses as the target for drying air in a bathroom after a shower, for example.
The setpoint automatically varies according to season, for instance, and is always at the
right level. This setting is factory selected.
2.
Humidity level can also be set fixed
. The setting can range between 1...99 %RH and is set at
the control panel. This can be used in public saunas and swimming pools, for instance.
The program aims at keeping humidity at the setpoint. The setpoint can be changed if
needed.
The mode of adjusting is chosen at the controller. Recommended humidity content of good
indoor air is approximately 45%.
When this control is on, the control panel may be used to raise fan speed to the maximum
fan speed and to decrease it to the basic fan speed.
In humidity control, fan speed varies between the basic and maximum fan speeds selected.
When the unit is first taken into use with automatic setpoint search enabled (factory setting),
it takes 3 to 10 hours for the program to define the value. During this time, humidity
adjustment is not enabled (because the first value, selected at the factory, is 100%).
Automatic search is enabled even if humidity control is not selected.
Ventilation control with remote monitoring system
KWL EC 300 Pro can be controlled with a voltage signal coming from remote monitoring.
The signal can be used to shut down the unit and to select speeds 0...8. However, if carbon
dioxide or humidity adjustment is enabled, the maximum fan speed cannot be exceeded.
The signal changes the basic fan speed.
The signal does not lock fan speed, i.e. it can be changed at the control panel within the
set limits. Carbon dioxide and humidity adjustment also operate within the set limits.
Heat recovery bypass function
The bypass function tries to get perferably cool supply air as possible to the ventilation
zone by comparing the measuring results of the outdoor air and extract air sensors.
As soon as the summer operation is activated at the remote control, the bypass on the
cross-counter heat exchanger is activated automatically over the bypass function, if:
1. the outside air temperature lies over the adjusted limit value AND
2. the room temperature lies over the outside air temperature
The setpoint can be changed between 0 +20 °C. (Factory setting 10 °C) (see 1.3.12).
Defrost function of heat recovery cell
Defrost prevents the heat recovery cells from freezing, thus ensuring proper ventilation even
in cold periods.
When there is a risk of frosting of the cell, preheating is activated and, when needed, the
supply air fan is stopped on the basis of the measuring data of the exhaust air temperature
sensor, located after the heat recovery cell. When the risk has passed, preheating is switched
off and the supply air fans start automatically.
If you want to use preheating in defrosting, you have to change the operation temperature to +5 °C (factory
setting 3 °C).
You can set the stopping temperature of the supply air fans (factory setting
+3 °C) and the hysteresis of the operation temperature (factory setting 3 °C) at the control
panel.
Humidity sensor
CO
2
sensor
Heat recovery bypass
10
DESCRIPTION OF OPERATION
Summary of Contents for KWL EC 300 Pro R
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