Airwell RT4D 20 [6/56] Optional features
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Airwell RT4D 20 [6/56] Optional features

Airwell RT4D 20 [6/56] Optional features
Page 6
Hot Water Heat
Hot water heat is an option, factory mounted down-stream of
the indoor coil.
The coil covers the entire surface of the indoor coil with low air
velocity to reduce the blower energy consumption and the noise
level. The coil is protected by a freeze stat.
A factory fitted 3-way valve communicates with the controller.
The valve is optional.
A circulating pump (antifreeze) is optional with by-pass and
check valve.
The capillary freeze-stat is factory fitted. On danger of freezing,
the blowers stops, the outdoor damper closes, the valve
opens.
Electric Heat
Electric heaters are optional and factory mounted down stream
of the indoor coil.
The heater covers the entire surface of the indoor coil reducing
the pressure drop.
Electric heaters are made of smooth steel coils.
2 stage heat is standard. 3 stage heat is an option.
A safety thermostat with manual reset senses the surface
temperature of the heating elements to protect the elements
from overheating. It switches the electric heater off, when the
heater surface rises above 110 °C.
Gas Heat
The RT4D offers an interesting energy alternative with the
combination of, a gas heater and the air to air heat-pump.
The gas heater is located down stream of the blower insuring a safe
over pressure around the heat exchanger.
The tubular heat exchanger is made of stainless steel to insure
an extensive durability.
The tubular heat exchanger increases the surface exposed to
the air flow and the heat transfer.
The flue-gas collector and the flue exhaust pipe are made of
stainless steel to be resistant to corrosion.
The atmospheric burners are not influenced by any outdoor
weather conditions.
The burner is standard 2 stages heat. The modulation of the
burner is optional.
The ignition of the burner and the protection of the flame sensor
are automatic.
The gas control valve shuts down the burner on faulty ignition,
low gas pressure, lack of combustion air.
The overheating capillary thermostat is diligently located near
the gas heater. It stops the burner on overheating and keeps the
blower operating until the heat exchanger is free of heat.
The gas pressure regulator ensures that a constant gas pressure
enters the burner when the main gas pressure fluctuates.
The gas heater has a CE Certification.
Roof Mounting Curb
The roof mounting curb is optional. The curb is shipped
knocked-down for field assembling.
The curb is made of 3.0 mm heavy gauge galvanized steel and
is 400 mm high.
A self adhesive gasket between the perimeter of the curb and
the RT4D is supplied. It stops vibration transfer and thermal
bridging.
The insulation and the flashing of the curb to the roof are field
furnished.
Optional Features
Roof
Roof insulation (by others)
Roof flashing (by others)
Roof mounting curb
RT4D rooftop

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