Rc Duct Heater Series RDH
Rc electric duct heaters are factory
assembled units consisting of a corrosion resistant steel frame, Open coil
/ tubular finned heating elements and a control box. These duct heaters
are fabricated in a wide Range standards and custom design for heating and
controls/ safety modes. These duct heaters can be Viewed / inspected upon
in our factory and are complete units, ready for installation on delivery.
Safety – Because the heater coil is completely encased in a grounded metal
sheath, shock hazard due to accidental contact are eliminated. Heaters
installed close to a register, grille or access door should either use
finned tubular construction or
an open coil unit with a protective screen.
Serviceability – In the unlikely event of element failure, it is easier to
replace individually mounted finned tubular elements
than open coil elements.
Mechanical Stability – Finned tubular elements are more rugged than open
coils. They will withstand more physical abuse.
Airflow Uniformity – Finned tubular duct heaters tend to be more tolerant
of non uniform airflow conditions. Heat conducted along the element
length reduces or eliminates hot spots resulting from non uniform airflow.
With open coil heaters, it may be necessary to use a pressure plate to
compensate for bad airflow conditions.
Controllability – Because of their relatively high thermal inertia, finned
tubular elements controlled with on/off thermostat systems provide more
precise control. Furthermore, finned tubular elements cycle at a reduced
rate, thus increasing the life of the power components such as contactors.
Nevertheless, when SCR controllers are used, equally precise control can
be obtained with either construction.
