Airwell RT4D 240 [5/56] Technical features continued
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Airwell RT4D 240 [5/56] Technical features continued

Airwell RT4D 20 [5/56] Technical features continued
Page 5
ROOM
D1
SA
D2
EF
OC
IC
D4 D3
Outdoor air
Exhaust air
Return air
Supply air
Return air
damper
Supply fan
centrifugal
Exhaust air
damper
Outdoor fans
Indoor coil
Bag filter
Outdoor coils
Outdoor
air damper
Electrical board and
compressors cabinet
Condenser
air damper
Legend :
D1 Return air damper (air recirculated to the building)
D2 Exhaust air damper (air leaving the building)
D3
Auxiliary outdoor air damper (outdoor air added to the
exhaust air to optimize the outdoor coil operation)
D4
Outdoor air damper (fresh air for ventilation of occupants
and free-cooling mode)
OC Outdoor coil (condenser on cooling, evaporator on heating)
IC Indoor coil (evaporator on cooling, condenser on heating)
SA Supply air blower - Centrifugal
EF
Exhaust plug fan with speed control to keep the return air
pressure constant
Technical Features (continued)
Blowers and Drives
The double flow is accomplished by two blowers.
A unique constant pressure control in the return air duct, keeps the
volume of air returning from the building to the RT4D constant.
The specially designed software eliminates the uncomfortable
under-and over pressure periods in the building, by reducing- or
increasing the speed of the exhaust blower, when the 4 dampers
are changing their position.
Up to 4000 m
3
/h, the supply air blower is centrifugal belt driven
forward curved type (sizes 20 and 40).
Up to 40 000 m
3
/h, the supply air blower is centrifugal belt
driven backward curved type with reinforced frame.
Sizes 280 and 380 have two parallel centrifugal belt driven
blowers in the supply air.
Single speed motors with adjustable pitch pulleys are
standard.
Variable air volume (VAV) with variable frequency drive on the
supply air blower motor is optional.
The motors are mounted on an independent platform with
adjusting spanner screw, to ease alignment and belt tension.
The motor and the belt-driven pulleys are guarded from injuries
by a perforated aluminum shield.
The blowers are isolated and connected to the casing with
flexible sleeves to eliminate vibration transfer to the cabinet.
An air pressure switch communicates with the controller and
monitors the presence of the supply air flow.
The exhaust air blower is made of one- or several high
performance radial direct driven plug fan(s).
The exhaust air blower is equipped with a speed controller as
standard.
One return air pressure transducer controls the pressure in the
return air duct. This unique feature keeps the return air pressure
constant by modulating the speed of the exhaust blower. The
RT4D keeps the air volume returning from the building to
the RT4D constant, while the position of the air dampers are
changing.
A perforated aluminum guard at the exhaust air protects from
injury.
Air Flow Arrangements
A choice of 6 air connections is available on the RT4D.
The supply- and the return air connections can be downward,
upward, or horizontal.
Air Filters
The air filters are mounted on sliding rails.
The access to the filter is possible through one door with ¼ turn
rotor lock fastener.
The optional main filter is a F7 (bag filter) protected by a G4
pre-filter, compliant with EN 779.
The outdoor coil is protected by a G4 filter.
The quality of the filter is monitored by a clogged filter switch
communicating with the controller.
The length of the optional bag filter is 292 mm from sizes 20 to
140; 560 mm from sizes 180 to 380.

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