Airwell RT4D 20 [2/56] Technical features
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Airwell RT4D 20 [2/56] Technical features

Airwell RT4D 20 [2/56] Technical features
Page 2
Technical Features
General
The RT4D is a pre-assembled weatherproof single package,
designed to save energy with long life durability.
The RT4D is an air to air double flow heat-pump combined
with 2 blowers and 4 dampers.
The quantities of return-, exhaust- and outdoor air are managed
by the 4 dampers to provide comfort and efficiency.
10 sizes are available, from 15 to 200 kW cooling capacity
handling up to 40 000 m
3
/h air volume.
The RT4D will satisfy commercial and industrial applications
with high ventilation requirements. It is built with a double
wall cabinet made of aluminum and 50 mm insulation, which
provides the best thermal and acoustical protection and prevent
the insulation fibers from entering the building. It is cleanable
from harmful bacteria build-up to protect the air supplied to the
building from contaminants.
More applied features such as, frequency-inverters on blowers,
modulation using inverter on one compressor, plug fans with
EC motors, high efficiency filtration (bag filters F7), additional
heaters (electric, hot water coil or gas), communication
(ModBus or LON talk) are available. For high summer outdoor
temperatures, option with R134a is available. Design permits
an installation inside the building. A full run test is performed at
the factory before the shipment to save time at the job site and
ease the commissioning. It will insure that the RT4D operates
correctly.
Cabinet
The RT4D is compact and made of ALUMINIUM to reduce the
weight and prevent the cabinet from corrosion.
The cabinet is watertight and airtight.
It is designed for roof mounted- and indoor applications.
The double wall in the air handling section eases cleaning and
prevents from insulation damaging.
The 50 mm insulation reduces the energy loss and the sound
dispersion.
The glass wool MO insulation is CE certified.
All metal-to-metal removable surfaces, exposed to the weather,
are sealed with closed cell neoprene gaskets.
When RT4D is higher than 1.7 m (above size 100), the doors
are hinged with a wind clamp to hold the door open.
The doors are equipped with ¼ turn rotor locking fasteners to
ensure a perfect air- and water-tightness.
The hinges and "rotor" fasteners are made of non corrosive
polyamide material.
The hinged doors are earthed to the cabinet.
Handles to open the rotor fastener are available.
A 3 mm heavy gauge galvanized steel single base rail insures a
high structural rigidity.
The 4 lifting points of the base rail prevent from deflection
during rigging.
The base rail is designed to fit the optional roof mounting curb
or any other field supplied supporting construction.
Technical Section
The compressors, most refrigeration-, electrical- and control
devices are located in a weatherproof technical compartment
divided from the airflow. The RT4D can be serviced without
interfering to its operation.
The control and electrical board is guarded by a independent
hinged door.
The compartment is insulated to reduce the noise disturbance
of the compressors to the environment.
The cables and wires are protected by flexible conduits.
Refrigeration System
The RT4D is designed to satisfy applications with hygienic ventilation
(fresh air) requirements. The thermodynamic process recovers the
energy from air volume leaving the building (exhaust air).
Tandem of two scroll compressors increases the seasonal
efficiency (SEER) on part-load operation.
The scroll compressors have higher efficiency, lesser vibration
and better resistance to eventual slugging.
Flexible conduits are placed on the discharge- and suction lines
of the compressor to eliminate vibration transfer.
All compressors have a crankcase heater (Rc1, Rc2) to insure a
safe start up in winter and overload protection (OLC1, OLC2).
Each circuit is equipped with one 4 way reversing valve (VH1).
The reversible system has two thermostatic expansion valves
per circuit (Tz1, Tz2), each valve is equipped with a by-pass and
a check-valve (VR1, VR2).
Each circuit is furnished with filter dryer, sight glass.
Two glass manometers (MHP, MBP) for high and low pressures
are placed on the outside of the casing.
One suction accumulator (SL), protects the compressor from
flooding on defrost cycle.
One liquid receiver (RV) in the liquid line regulates the fluctuating
refrigerant flow to the compressor.
The outdoor coil (BCO) is divided in two vertical coils, V-formed,
when the RT4Ds has two circuits. This unique feature eases the
defrost of one circuit without disturbing the heating of the other
circuit.
There is one drain pan under both outdoor coils.

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