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Chromalox
®
DIVISION
4
SECTION
GEN
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation Instructions
POO400-7
161-048339-001
DECEMBER, 2006
(Supersedes POO400-6)
© 2010 Chromalox, Inc.
GENERAL
INSTALLATION
CHROMALOX ELECTRIC HEATING ELEMENTS FOR CLAMP-ON
Users should install adequate controls and safety
devices with their electric heating equipment.
Where the consequences of failure may be severe,
back-up controls are essential, including GFCI
(Ground Fault Circuit Interrupters). Although the
safety of the installation is the responsibility of the
user, Chromalox will assist in identifying equipment
options.
FIRE HAZARD. Since heaters are capable of devel-
oping high temperatures, extreme care should be
taken to:
A. Avoid mounting heaters in an atmosphere containing com-
bustible gases and vapors.
B. Avoid contact between heaters and combustible materials.
C. Keep combustible materials far enough away to be free of the
effects of high temperatures.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed by a qualified person
in accordance with the National Electrical Code,
NFPA 70.
High heating efficiency, low sheath temperatures and long
heater life result when electric heaters are properly installed.
INSTALLATION – CLAMP-ON
1. Clamp strip heaters securely, along their entire length, to
smooth metal surface. Use utility clamps spaced 5” apart and
5/16” stainless steel studs or oversized steel studs for clamping.
Retighten following initial heat-up. Allow for expansion. When
more that one clamp is used, tighten clamps to avoid bowing of
heater, poor heat transfer and possible premature failure. Leave
1/2” space between heater ends clamped in line for expansion.
Do not use mounting tabs for clamping to surface.
2. When strips are clamped to tank bottom for melting paraffin,
waxes, asphalt, greases, etc., one or two strips should be
clamped vertically to the tank side extending above the liquid
level. This is necessary to open a passage to the tank surface for
the initially melted material, and prevent build-up of pressure.
3. Clamp ring heaters to smooth metal surface. Use cast iron utility
clamps with 1/4” MONEL
®
or stainless steel studs. Retighten
following initial heat-up.
4. Tubular heaters are clamped the same as strips against the metal
surface.
5. Allow a minimum of 1” air space between heaters and insula-
tion.
General Recommendations on the Use of Chromalox
®
Electric Heating Elements for Clamp-On,
Oven and Air Duct Heating
The electric heating element(s) supplied herein are ruggedly
constructed and if properly installed, operated and maintained, are
designed for long life and dependable, trouble-free service.
The following units are generally used in these applications:
Tubular, Strip, Ring, Fin-Tubular and Fin-Strip