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8.1.2.
Air dampers
Base sections are equipped with 2 multi-plane dampers with seals. They are mounted inside the
casing. One is located at the fresh air inlet side, and the other at the inlet of the air being exhausted
from rooms. Thanks to such solutions damper actuators are also located inside the casing, and
protected against the precipitation.
8.1.3.
Filters
Base sections are equipped with fine M5 panel filters at the air supply side and the removed air side,
and with very fine F7 bag filters at the air supply side. Between each filter section and along guides,
special seals are applied. Number of filter sections and their size depends on the unit size.
8.1.4.
Fans
In base sections centrifugal fan with direct drive powered by AC or EC 3x400V motors have been
used. Depending on unit size, a total of 2 or 4 fans are used. Rotors in all unit sizes, except 10, are
made of plastic.
8.1.5. Rotary heat exchanger
In base sections, high-efficiency condensing rotary heat exchangers are applied. In order to minimize
air leaks between air supply and exhaust parts, flexible circumferential seal and horizontal brush seal
have been applied. The rotor is driven by a belt transmission with 3~230V/50Hz powered motor with
cylindrical gearmotor.
8.1.6.
Condensate tray
Under the rotary heat exchanger rotor, in the casing floor a tray made of stainless steel has been used
to collect condensate with condensate drains, provided outside the casing. On the tray perimeter,
between the tray and the casing silicone seals are fitted.
8.2. WATER HEATING COIL SECTION
The section has been designed as air-supply type in single-deck configuration. The section comprises:
casing, fin water heating coil.
8.2.1. Casing
Casing construction bases on the spacious frame made of aluminium profile. Wall, roof and
base planes are heat insulation panels made of 45 mm thick mineral. Inside the panel special
reinforcements are used thanks to which the whole structure is stiff and strong. At the service side
inspection door is mounted; it is closed using clamps with thumb screws. In order to ensure proper
tightness of the whole casing the panels are sealed with special adhesive, and inspection door is
provided with double gaskets.
To keep tightness between the connected sections, air supply inlets and outlets have insulation on
their circuits. Additionally, in corners of the casing at air supply inlet and outlet sides, steel section
connectors with oblong holes are fitted. When connecting sections, this solution enables to level any
slight unevenness in surface for setting the unit both vertically, and horizontally.
In order to ensure proper setting of the section on the ground, the casing, in all sizes, is equipped
with load-bearing feet.
