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Operation
CAUTION: For your own safety
Before energizing this heater:
1. Be sure all electrical connections are tightly made.
2. Be sure that all conductors are properly insulated,
and that they will not chafe at the heater wire en-
trance due to expansion and contraction of the
heating element.
3. Be sure that terminal box covers have been properly
replaced, and that secondary insulation bushings
have not been omitted.
Controlling Radiant Intensity
Standard Radiant Heaters are built to operate at 40
watts per sq. inch on the element sheath. When it is
desired to reduce radiant intensity, one or more of the
following methods may be used.
1. INPUT CONTROLLERS. These motor-driven cy-
cling devices can be used to vary heater output ca-
pacity from 4 to 100%. They are usually connected
in holding coil circuit of magnetic contactors. See
Chromalox Radiant Heater Manual for further infor-
mation regarding Input Controllers and Contactors.
2. SOLID STATE THYRISTOR POWER CONTROL-
LERS. For best non-contact control of radiant heat,
a Series #6 Chromalox Thyristor Power Controller
with manual potentiometer setting is recommend-
Maintenance
HAZARD OF ELECTRIC SHOCK. Disconnect
power before servicing heater.
To Remove Heating Element
1. Remove conduit box cover screws, gasket and cov-
er.
2. Disconnect heating element from electrical leads at
both ends.
3. Remove screws @ from porcelain terminal blocks.
4. Remove element support clips and secondary insu-
lating bushings.
5. Lift element out of heater.
ed. Truly proportional output of from 0-100% can
be easily dialed-in to suit the particular product or
process requirements. The Series #6 panels are
pre-engineered, pre-packaged assemblies in an en-
closure with circuit disconnect provided and ready
for installation.
Maximum Ambient Temperatures
CHROMALOX Radiant Heaters are not recommend-
ed for applications in ambient temperatures exceed-
ing 300°F. Higher ambient temperatures mean shorter
heater life.
Maximum work temperature in a given time depends
on several factors: Reflectivity of work, specific heat of
work, mass of work, kw. input and losses from oven,
and time of exposure. As work temperature increases,
the work loses heat by radiation and· by convection to
the surrounding ambient.
Although it is a general principle of Radiant Heater
application that work temperature conventionally ex-
ceeds ambient temperature, in cases where high work
temperatures are desired, it is necessary to enclose the
heaters in order to increase the ambient. If evapora-
tion of a liquid is desired as a result of increasing work
temperature, it is necessary to provide ventilation air in
order to carry away the evaporated liquid.
To Install Element
Observe instructions for removing element and pro-
ceed in reverse order. Be sure to replace secondary
insulating bushings,
Care of Reflector
Reflectors should be cleaned periodically. A mild soap
and water solution or fine cleaning powder is best al-
though more drastic means may be required if reflec-
tors are badly soiled by chemical or other deposits.
The reflector is aluminum. DO NOT use alkali clean-
ers since alkalies will dull reflector. Mild non-alkaline
cleaners, such as used for scouring kitchen sinks, may
be used. Reflectors are replaceable and may be pur-
chased from Chromalox.
5
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