Airwell RT4D 60 [51/56] Air flow arrangements
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Airwell RT4D 60 [51/56] Air flow arrangements

Airwell RT4D 60 [51/56] Air flow arrangements
Page 51
BLOWER AND DRIVE SECTION
THE SUPPLY BLOWER SECTION
The blower(s) shall be belt driven, (direct driven) centrifugal with
two inlets, vibration isolated, mounted in a reinforced frame
and attached to the cabinet with a flexible connection.
The blower shall have backward curved blades.
The motor shall be mounted on an independent platform with
adjusting screw-spanner for alignment and belt tension.
The blower and the motor drive shall be accessible through a
service hinged door.
The belt drive shall have rotor-lock pulleys.
The blower motor shall be frequency modulated for variable air
volume. The inverters shall mount in a divided electrical panel
in the technical compartment.
A discharge sensor shall maintain a constant supply air
temperature.
An air flow switch shall be factory mounted to sense the pressure
difference between the blower entering-and leaving.
THE EXHAUST AIR BLOWER (RETURN AIR BLOWER) SECTION
The blower(s) shall be of the plug fan type direct driven.
Each plug fan shall be cased-in to the outdoor coil to avoid
short circuiting.
Each circuit has one or two plug fan(s).
The exhaust blower shall be speed controlled.
One air pressure sensor in the return air duct shall control the
speed of the exhaust air blower and keep the static air pressure
in the duct leaving the building constant, regardless of the
position of the 4 dampers.
AIR FLOW ARRANGEMENTS
The supply air and return air shall be connected :
Down flow , within the floor of the ROOFTOP.
Up flow in the roof of the ROOFTOP.
Horizontal at the front and on the side of the ROOFTOP.
AIR FILTERS
The air filters shall be mounted on sliding rails upstream from
the indoor coil with a hinged service door.
The filter shall be F7 bag filters with a G4 pre-filter compliant
with EN 779.
The bag-filter shall be F7 with low leakage tensioning clamps
on the rack.
The clogged filter-switch shall be factory fitted and wired to the
Controller.
FOUR DAMPER
The ROOFTOP shall be supplied with four air dampers, each
one of them shall handle up to 100% of the air flow.
Each one of the four dampers is independently actuated by a
motor.
Two dampers shall be located in the outdoor air, one to the
outdoor coil and one to the indoor coil. Both outdoor air
dampers shall be hinged to permit the service inside the unit.
A third damper shall be in the recirculated air and the fourth
damper shall be in the exhaust air.
The dampers shall be made of profile aluminium.
In summer the outdoor air damper shall open to 100% and the
ROOFTOP shall operates less compressor when the outdoor
temperature is lower than the indoor temperature (free-
cooling).
On free-cooling the outdoor air damper shall modulate in
correlation with the exhaust air damper.
The economizing function shall be monitored by the sensible
heat of the outdoor- and indoor air.
The economizing function shall be monitored by the enthalpy of
the outdoor- and indoor air.
A quality sensor shall monitor the quantity of outdoor air to
ventilate the building.
The minimum outdoor air volume for the hygienic ventilation of
the occupants shall be adjustable at the Controller.
The outdoor- and exhaust air dampers shall close on start-up,
non occupied and morning warm-up.
A smoke detector shall be factory installed in the ROOFTOP.
HEATING SECTION
GAS HEAT (CONDENSATION BURNER AS OPTIONAL)
The direct gas heat section shall have a pre-mix condensing
power burner using latent heat from gas to save energy.
The gas burner shall be pre-adjusted at the factory for 0 ppm
CO and less than 35 ppm NOx. The gas-burner shall need no
adjustment on field start-up.
The efficiency of the gas heater shall be approximately 105 %
at 30% of the maximal heating capacity.
The heat exchanger shall be made of Stainless-steel, capable
of handling entering outdoor air down to -20 °C.
The combustion-air blower shall have a variable speed driven
proportionally to the heat demand.
The heat-exchanger and the flue vent shall be equipped with
one common condensate drain leading outside the unit.
The combination gas burner / heat-exchanger shall have a
common CE certificate.
The gas burner shall have 2 stage heat.
The gas burner shall be modulating from 30 to 100 %.
A condensate neutralisator shall be supplied with the unit for
field installation at the condensate drain.
GAS HEAT (ATMOSPHERIC BURNERS AS STANDARD)
The direct fired tubular heat exchanger shall be equipped with
atmospheric burners.
The efficiency of the combustion shall be not less than 92%.
The heat exchanger shall be made of stainless steel. It will
have an induced blower to exhaust the fumes without outdoor
interference.
Guide Specification - RT4D (continued)

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