Chromalox Heating System POO400 7 User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation Instructions  
DIVISION  
SALES  
4
SECTION GEN  
REFERENCE (Supersedes POO400-6) POO400-7  
161-048339-001  
DATE  
DECEMBER, 2006  
®
General Recommendations on the Use of Chromalox  
Electric Heating Elements for Clamp-On,  
Oven and Air Duct Heating  
CHROMALOX ELECTRIC HEATING ELEMENTS FOR CLAMP-ON  
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  
GENERAL  
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.  
INSTALLATION  
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.  
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.  
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.  
High heating efficiency, low sheath temperatures and long  
heater life result when electric heaters are properly installed.  
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.  
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  
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.  
© 2010 Chromalox, Inc.  
 
CHROMALOX ELECTRIC HEATING ELEMENTS FOR OVEN HEATING – AIR DUCTS  
The electric heating element(s) supplied herein are ruggedly con-  
structed and if properly installed, operated and maintained, are  
designed for long life and dependable, trouble-free service.  
GENERAL  
Temperature regulating and temperature limiting controls are  
recommended to be used with electric heaters to control the heating  
process and safeguard the electric heaters from excessive tempera-  
FIRE HAZARD. Since heaters are capable of devel-  
tures that can damage heaters.  
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.  
INSTALLATION  
4. Mount strips on edge in horizontal installation across the bottom  
and along the sides on the oven, allowing 3” minimum air space  
between the heaters and the bottom of the oven and 1” from the  
ELECTRIC SHOCK HAZARD. Disconnect all power  
oven wall to allow for proper circulation of heated air. For large  
before installing or servicing heater. Failure to do  
ovens, allow a 6” minimum clearance.  
so could result in personal injury or property dam-  
5. In horizontal mounting, install a protective screen or grill above  
age. Heater must be installed by a qualified person  
in accordance with the National Electrical Code,  
NFPA 70.  
the strips at the bottom of the oven.  
6. Support long iron sheathed strips on 36” centers and chrome  
steel sheathed strips on 24” centers to prevent sagging.  
High heating efficiency, low sheath temperatures and long  
heater life result when electric heaters are properly installed.  
INSTALLATION – AIR DUCTS  
1. Locate protective thermostat on downstream side of heaters near  
the top of the duct and close to the heated portion of the heaters.  
2. Mount heaters with terminals at the duct bottom to prevent over-  
heating.  
3. Where condensation, spray, oil or fumes are present use seam-  
less finstrips, type SSEF, with the terminals placed outside of  
the air duct.  
4. As a safety feature in advent of abnormal temperatures, it is sug-  
gested to use a thermal cutout in conjunction with thermostatic  
control.  
INSTALLATION – OVEN HEATING  
1. When mounting the strip heaters vertically, locate the terminals  
at the bottom or cooler parts of the oven. Allow for expansion  
and contraction by loosely bolting the top mounting tab. Secure  
the bottom tab firmly.  
2. In a forced air system, the width of the strip should be parallel to  
the direction of air flow.  
3. For horizontal installation of strips, the tab on the terminal end  
should be firmly connected and the opposite end loosely con-  
nected to allow for expansion and contraction.  
WIRING  
1. Electric wiring to heating elements must be installed in accor-  
dance with National Electrical Code or local electrical codes by  
a qualified person.  
ELECTRIC SHOCK HAZARD. Any installation involv-  
ing electric heaters must be performed by a quali-  
fied person and must be effectively grounded in  
accordance with the National Electrical Code to  
eliminate shock hazard.  
2. Temperatures at heater terminals may require use of high-tem-  
perature wire. Check factory for recommendations.  
 
3
CHROMALOX ELECTRIC HEATING ELEMENTS FOR OVEN HEATING – AIR DUCTS (cont’d)  
GENERAL INFORMATION  
1. Strips of equal wattage and voltage can be series connected for  
a maximum of 480 volts. If a higher voltage (600 volt max.) is  
necessary use the same series connections and use secondary  
insulation bushings.  
2. Use iron or steel sheathed heaters for temperatures up to 750˚F  
maximum sheath temperature. Use chrome steel sheathed strips  
for temperatures up to 1200˚F maximum sheath temperature.  
Use alloy or Inconel® sheathed tubular heaters for temperatures  
up to 1500˚F maximum sheath temperature. The sheath temper-  
ature is the highest temperature on the surface of the heater  
when operating.  
3. Do not bend or form strips.  
4. Use manganese nickel wire or alloy bus bar for making electri-  
cal connections where temperatures are above 350˚F. Insulated  
copper wire may be used in the cooler region.  
5. Terminals should always be in the coolest part of the oven. If  
oven temperature is over 800˚F the terminals should be placed  
outside the oven if possible. If not possible, weld electrical con-  
nections to heater terminals. Protect terminals from welding  
flux.  
6. Tubulars are to be mounted the same as strips and supported on  
24” centers.  
MAINTENANCE  
1. Periodically clean terminals of dust and corrosion to maintain  
good electrical connections and to permit rapid heat dissipation.  
Use airblast and be careful to avoid damage to mica insulation.  
2. Check for loose terminal connections.  
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 per-  
son in accordance with the National Electrical  
Code, NFPA 70.  
Limited Warranty:  
Please refer to the Chromalox limited warranty applicable to this product at  
2150 N. RULON WHITE BLVD., OGDEN, UT 84404  
Phone: 1-800-368-2493  
 

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