Máy sưởi khí ống gió Duct Heater

Máy sưới khí ống gió Duct Heater

máy sưởi khí ống gió, RDFT – Commercial Flanged Duct Heater– The Ruffneck™ RDFT Commercial Flanged Duct Heater with non-finned tubular (Calrod® type*) elements is designed for use in comfort heating applications, such as make-up air heating, air pre-heating, air handling equipment, fan coils, terminal reheating, multi-zone reheating, heat pump auxiliary systems and return air heating. The non-finned incoloy® element design should be chosen where high humidity or slightly corrosive contaminants may be present in the air stream, as this type of element features higher corrosion-resistance than the finned element design. Unlike open coil designs, duct heaters fitted with tubular elements are not subject to hazards of electrical shock, which allows ins

tallation closer to a register or grille.

APPLICATION:

Ruffneck™ air duct heaters are for use in comfort heating applications.
Typical applications include:
• Make-up air heating
• Air pre-heating
• Air handling equipment
• Fan coils
• Terminal reheating
• Multi-zone reheating
• Heat pump auxiliary
systems

Type RDFF is a flanged duct heater with finned tubular heating
elements.
Type RDIF is an insert duct heater with finned tubular heating elements.
Type RDFT is a flanged duct heater with Incoloy® (non-finned) tubular
heating elements.
Type RDIT is an insert duct heater with tubular heating elements.

STANDARD FEATURES:

Primary linear cutout: 160°F (71°C), 277/600 Vac, 25/10 amp
non‑inductive
• Secondary linear cutout: Manual reset complete with back-up
magnetic contactor on units under 300 V, 30 kW and less, 225°F
(107°C) 277/600 Vac, 25/10 amp non‑inductive
Optional Auxiliary Duct Heater Controls
These controls are available as factory installed on the duct heater or as
an EEMAC rated (specify) control panel for wall mount:
• Wall thermostats:
– T498A
– T6051A (1 stage)
– T6052A (2 stage)
– T921A (0 – 135 ohm)
• Duct thermostats”
– T675A (1 stage)
– T678A (2 stage)
– T991A (0 – 135 ohm)
• Bulb holders
• Silent contactors
• SCR controllers
• Sail switch
• Differential pressure switch
• Main disconnect
• Pneumatic electric switches
• ON-OFF switch
• Magnetic contactors
• Step controllers
• HRC fusing
• Control transformers
• Fan interlock relay
• Pilot lights
Figure 21 –Duct heater controls

C US
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Ruffneck™ 61RDFF, RDIF, RDFT, & RDIT – Air Duct Heaters
Element Types
The finned tubular element design is the most popular. It incorporates
the highest wattage per cross-sectional duct area, thus makin