VTR 100B LITE Installation and Service manual v2

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Service
9.3.2 Filters
It is very important to change filters regularly for performance and energy efficiency of the unit.
The factory installed filters are of filter quality G3/Coarse 50% for the supply air and G3/Coarse 50% for the extract air
filter. The filters need to be replaced when polluted. New sets of filters can be acquired from your installer or
wholesaler.
Each filter has a label with an part number for identification. Provide this number when ordering new filters.
9.3.3 Heat exchanger
VTR 100/B LITE is equipped with a highly efficient, rotating heat exchanger. Required supply air temperature is there-
fore normally maintained without adding additional heat.
The heat exchanger is removable for cleaning and maintenance, see “User Manual” for more information.
9.3.4 Print card
The main print card (pos. 6 figure 31) controls the functions and set temperatures of the unit. It is possible to connect
external accessories to terminals in the print card. See wiring diagram for more information.
9.3.5 Temperature sensors
Four temperature sensors (NTC, 10 kΩ at 25°C) are included in the unit from factory and positioned in the correspond-
ing air chambers.
The sensors are connected to the main print card. See wiring diagram for more information.
9.3.6 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.
9.4 Trouble shooting
A warning triangle with text in the display indicates an alarm. Turn menu selector to the warning triangle and press con-
firm twice to view the alarm.
Alarm
If problems should occur, please check the items below before calling your service representative.
Malfunction
Action
Fans do not start
1. Check the display for alarms.
2. Check fuse for main power supply in the distribution box for the building and all the
quick connectors are connected in the unit (quick connectors for supply and extract
air fans).
3. Check that the week program is in ON mode. The week program might be in OFF
mode with the airflow set to OFF (chapter 5.7)
4. Check if one of the digital inputs 1–3 (DI 1–3) is active and set to off. This would
force one or both fans to stop depending on the setup (chapter 8.5).
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