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4.
Protect terminals of heating elements from drippings,
condensation, fumes, spray or any other substance which
could result in element contamination.
C.
INSTALLATION
CAUTION
Heaters with overtemperature devices
require specific installation orientation.
CAUTION
ELECTRIC SHOCK HAZARD
before installing or servicing the heater. Failure to do so
CAUTION
could result in personal injury and/or property damage.
All maintenance and installation should be done by
qualified personnel in compliance with local codes.
FIRE OR SHOCK HAZARD
on the dielectric material of the elements, sheath
WARNING
corrosion or overtemperature on the heaters could
cause a fault to ground generating arcing and molten
metal. Install proper ground fault protections to prevent
personal injury or property damage.
CAUTION - Hazardous locations only. A conduit seal
must be installed within 50 mm (2") of the enclosure.
CAUTION
WARNING
Heaters are electrical components,
designers are responsible for the proper integration to
WARNING
the electrical systems, including protections, backups,
and controls.
1.
Unpack and check heater for any damage that may have been
caused during shipping.
2.
Remove any protective packaging in the screw or flange
connecting fitting.
3.
Remove any dessicant material in the electrical box.
4.
Insert heater into vessel/reservoir and verify that the heating
elements are not making contact with the surface of the vessel.
5.
Check that all terminal connections are tight.
CAUTION
Use copper conductors only with
sufficient current carrying capacity for the heater
CAUTION
circuit load and in accordance with the local electrical
code. Check the heater nameplate for minimum
conductor temperature rating. Temperature deration
factors must be applied for heaters operating above
30°C (86°F).
6.
Check supply voltage for compliance with heater nameplate
voltage. DO NOT connect the heater to a voltage source other
than listed on the heater nameplate.
5.
7.
Disconnect all power
8.
Moisture accumulation
9.
10. If the heater is installed in a pressurized system, a safety relief
11. Horizontal element support bundles may be necessary with an
12. For flange heaters installed in a pressurized system, proper
13. Heaters with explosion resistant terminal housings must only
When melting solids by direct immersion, a surface vent
should be provided to allow gases to escape. Operate
the heater on ½ voltage until melted material completely
covers the heating elements. Heaters used for this purpose
may require special design features. Check factory for
recommendations.
A line voltage or pilot duty thermostat should be used to
control the heater. The pilot duty thermostat must be used
with a contactor and (if required) a transformer. Generally,
heaters supplied with built-in thermostats will be factory
prewired if suitable for line voltage operation. Integral
thermostats not factory prewired are usually intended for pilot
duty.
It is recommended that the control circuits be supplied from
the isolated secondary windings of transformers avoiding
the need for two supply circuits, or as an alternative, that
mechanical or electrical interlocking be provided so that both
supplies must be disconnected before live parts can be made
accessible.
If there is even the slightest possibility that the liquid
level may fall below the elements, a level control switch
or overtemperature sensing device affixed to the
uppermost heating element is required. Check factory for
recommendations.
valve must be used to prevent a hazardous pressure buildup.
immersed length over 1270 mm (50").
bolting hardware must be used that is suitable for the
pressures and temperatures of the equipment. Use an
appropriate gasket for the pressure and temperature; torque
the bolts on an even clockwise or counter clockwise pattern.
be used in locations for which the heaters are certified.
a.
Check heater nameplate information for approval code.
b.
Never energize an explosion resistant heater unless the
terminal housing cover is properly tightened.
c.
An immersion heater for hazardous locations is approved
for use only if an approved liquid level control and/or
temperature limiting device is used to de-energize the
heater under low liquid conditions.
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