DVUT/DVUE 300 HB EC
6
www.vents-us.com
Additional equipment (available on a separate order)
• Humidity sensor. The unit with an installed humidity sensor maintains a set indoor humidity level. As the extract air humidity rises
above the set point, the system automatically switches to the maximum speed. As the humidity drops down below the set point
the unit returns to the previous mode.
• CO2 sensor. Measures the level of concentration of carbon dioxide in the room and generates a signal that controls the performance
of the fan. Air flow control based on CO2 concentration is an efficient energy saving solution.
DESIGN AND OPERATING PRINCIPLE
The unit operation is as follows:
Warm extract air from the room flows into the unit and is
cleaned in the extract filters. Then the air is moved through
the heat exchanger and is exhausted outside through the air
ducts with the extract fan. Cold fresh air from outside flows
into the unit, where it is cleaned with the supply filters. Then
the air flows through the heat exchanger and is moved to
the room with the supply fan. Supply air is heated in the
heat exchanger by transferring the heat energy of warm and
humid extract air to the cold fresh air. 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.
UNIT DESIGN
Supply fan
Supply filters
Bypass air
damper actuator
Heat exchanger
Sensor
mounting
bracket
Controller
Control unit
Supply filter
Extract filter
Condensate
drain pan
Extract fan
UNIT OPERATING PRINCIPLE
Return
air
Exhaust air
Outside air
Return
air
Supply
air
The unit is a frame structure made of rigidly fixed steel panels.
The panels are made of painted steel sheets and a galvanized
steel sheet with a layer of mineral wool between for heat- and
sound-insulation.
The service door enables access for maintenance and service
operations.
The power cables and grounding conductors must be routed
through the cable glands to the terminal block located on the
top casing panel.
The wiring diagram for wiring of the air handling unit is shown
on the inner side of the terminal box lid.
The unit design enables installation of a bypass duct with
a bypass damper to route the intake air stream without
contacting the heat exchanger.
To protect the heat exchanger from freezing in the cold
season, the unit has a Frost Protection mode.
If there is a risk of freezing, the supply fan is switched off.
After temperature increase the unit returns to the previous
operation mode.
The supply and extract air temperature difference during heat
recovery may lead to condensate formation in the units with
a polystyrene heat exchanger. The condensate is collected in
the drain pan and is removed outside to the exhaust air duct
through the drain hose. No condensate is generated in the
units with an enthalpy heat exchanger as the air moisture is
transferred from one air stream to the other via the membrane.
