10.3.5 Temperature sensors
Four temperature sensors (NTC, 10 kΩ at 25°C) are included in the unit from factory and positioned in the
corresponding air chambers.
The sensors are connected to the main print card. See wiring diagram for more information.
10.3.6 Humidity sensor
Relative humidity sensor (RHS) is included in the unit from factory and positioned in the extract air chamber.
The sensor is connected to the main print card. See wiring diagram for more information.
10.3.7 Electrical Re-heater battery
The re-heater battery is positioned in the supply air chamber.
The re-heater is activated by a relay and switches on if the supply air temperature is lower than the set
point and switches off if one or more of the following conditions are met:
1. If the supply air temperature is above the set point.
2. If the over heat protection is activated or the sensor is malfunctioning.
3. If the emergency thermostat is triggered or broken.
4. If the supply air sensor is in error state.
5. If the supply air fan is not running.
6. If the heater is set to disabled in the menu.
7. If re-heater is disabled by digital input 4 (DI 4).
10.3.8 Overheat protection reset button
If the supply air temperature is low, it can indicate that the over heat protection is triggered. The overheat
protection can be reset by pressing the reset button (1).
Fig. 11 Overheat protection reset button
SAVE VTR 200/B
Installation and Service
208061
36
Systemair Sverige AB
