106 / 129
106
How to designate an HF Series open coil duct heater:
Volts
Phase
Kilowatts
Width
Height
Control Volts
Stage
Options
Air Flow
Options
Model
480 3 HF 10KW 12W 12H 24
2 HR B G
HF Series Open Coil Element Duct Heater
Optional Controls & Features
Open coil duct heaters offer several advantages when used
properly. They release heat directly into the air stream
resulting in lower element temperatures, provide higher
wattage per square foot of duct area, have low pressure drop
due to high percentage of open area, are light weight, easily
installed, and economical with quick delivery available.
A: Additional Stage
B: “A” Alloy Element Wire
C: Disconnecting Contactors
D: PE Switch
E: Minimum fusing under 48 Amps F: Flanged Construction
G: Door Interlock Disconnect Switch H
1
: SCR Control Single Phase Only
H
3
: SCR Control Three Phase Only I:
NEMA 1 Dust Tight Control Box
J: Electronic Step Controller
Standard Features
• Galvanized steel control box with optional 1/2”
insulation and hinged cover.
• Primary and secondary over temperature protection.
• De-energizing definite purpose contactors.
• Differential pressure fan interlock.
• 24 Volt control transformer.
• Fusing over 48 Amps (per NEC).
• Line terminal blocks.
• Made in U.S.A.
•Insert or Flange. •Integral or remote controls. •Standard NEMA 1 control.
•Panel - available with NEMA 4-4x -12 panels as option integral or remote mounted.
• Comply with NEC specification.
Custom Specified Models
Air Flow Designations Guide for HF Series Duct Heaters
HR: Left to Right (shown)
HL: Right to Left
VU: Vertical Up
D:
Vertical Down
Control panel standard is extended upstream and same height as duct. This can be altered to accommodate available space.