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The unit has the following operating logic: warm stale extract air from the room flows into the unit, where it is filtered by the extract filter,
then air flows through the heat exchanger and is exhausted outside by the extract fan. Cold fresh air from the outside flows into the unit,
where it is cleaned by the supply filter.
Then the air flows through the heat exchanger and is directed to the room with the supply fan. Heat energy of warm extract air is
transferred to clean intake fresh air from the outside and warms it up. The air flows are fully separated while flowing through the heat
exchanger. Heat recovery minimizes heat losses, which reduces the cost of space heating in the cold season.
The difference between the supply and extract air flow temperature leads to condensate generation. Condensate is collected in the drain
pan and is removed outside through the drain pipe.
The VUT 160/250/350 PB EC L/R A11 unit assembly
Control panel
Detachable service plates for filter
maintenance operations
Service side
Outdoor temperature sensor
Supply air temperature sensor
Supply fan
Extract fan
Control unit
Bypass damper
Extract filter
Drain pan
Drain pipes
Counter-flow heat exchanger
Supply filter
Temperature sensor for heat
exchanger freeze protection
HV1 humidity sensor*
Electric lead-ins
NKP duct heater
for supply air pre-heating
* Accessories for the unit available on separate order
• HV1 humidity sensor. The unit with the installed humidity sensor maintains a set indoor humidity level. As the humidity level of the
extract air reaches the set point, the unit switches to the maximum speed automatically. As the humidity drops down below the set
point, the unit returns to the previous mode. Installation and connection of the humidity sensor (see page 10) is carried out on site
by the service technician.
• NKP duct heater for supply air pre-heating.
• The heater maintains the duct air temperature at a point that prevents the heat exchanger freezing. An automation system
regulates heater operation.
UNIT DESIGN AND OPERATING PRINCIPLE
