Immersion Heaters
ISO 9001
CX & DX Series
Installation, Operation, & Maintenance Instructions
Special Notes
ELECTRIC SHOCK HAZARD. All electric heating equipment installations must be performed
by qualified personnel in accordance with the local electrical codes and standards and must be
CAUTION
effectively grounded to eliminate shock hazard.
FIRE/EXPLOSION HAZARD FOR HAZARDOUS LOCATION HEATERS. This heater shall
be used with protection controls as follows:
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Liquid Immersion Applications
a. Liquid level control to maintain all the heating elements totally immersed at all times, in
conjunction with temperature controls to limit the liquid temperature below the maximum
allowable process design temperature, or
b. Heating elements sheath temperature controls to limit to the maximum allowable sheath
design temperature
Gaseous and/or vapour phase immersion applications
a. Heating elements sheath temperature controls to limit to the maximum allowable sheath
design temperature.
FIRE/EXPLOSION HAZARD. Do not exceed the ratings of the flange as listed in ANSI BI6.5.
Do not operate the heater in the presence of combustible gases, vapours, dusts or fibres unless
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the heater is specifically marked for the hazardous location and heater operating temperature
does not exceed the temperature code rating. Corrosion of the sheath could result in a ground
fault which, depending upon the fluid being heated, could cause a fire or an explosion.
FIRE HAZARD. If a thermostat is provided, it is designed for temperature control service only.
Since the thermostat does not fail safe, it should not be used for temperature limiting duty. Wiring
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to this device is the users' responsibility.
Heaters are capable of developing high temperatures, therefore extreme care should be taken to:
a. Use explosion-proof terminal enclosures in hazardous locations;
b. Maintain distance between heater and combustible materials.
Part No. MI110 Rev.12 Date of Issue: October 2017 Printed in Canada
TABLE OF CONTENTS
A. Diagrams ................................................................... 2
B. Description ................................................................ 2
C. Installation ................................................................. 3
D. Operation ................................................................... 4
E. Maintenance .............................................................. 4
A. DIAGRAMS
Optional
Thermostat
Terminal Box
Screwplug
Optional Thermostat Well
Immersed Length
Screwplug Immersion Heater
Terminal Box
Mounting Flange
Immersed Length
Flanged Immersion Heater
Terminal Box
Stilted Section
Mounting Flange
Immersed Length
Flanged Immersion Heater
(with optional stilted terminal box)
Pipe Riser
6" (152 mm)
3" (76 mm)
Terminal Box
Optional Thermostat Well
Minimum
Liquid Level
Over-the-Side Immersion Heater
(bottom mount)
Terminal Box
Minimum
Liquid Level
Over-the-Side Immersion Heater
(side mount)
B. DESCRIPTION
1. Immersion heaters for liquid service are designed for operation
only while completely immersed in liquids. Never allow the heating
elements to be exposed while energized or failure will result.
CAUTION Use the heater only in liquids and
at pressures for which it was designed (unless
CAUTION
specifically designed for non-liquid applications).
Normally copper sheath is recommended in water,
steel or alloy sheath in oil, and the appropriate alloy
sheath for heating chemical solutions. Check factory
for recommendations.
Diagrams / Description
2
2
2. In the case of flanged (and some screwplug type) heaters
where a gasket seal is required, the gasket surface should be
clean and dry before the heater is seated.
WARNING DO NOT insulate over the heater flange,
stilted area and terminal enclosure.
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3. The terminals must be protected at all times from moisture or
vapour. In hazardous locations, explosion resistant terminal
housings must be used. In outdoor locations, moisture resistant
housings are required. It is recommended to use a drip loop to
prevent moisture from entering the terminal box via the wire.
4. Protect terminals of heating elements from drippings,
condensation, fumes, spray or any other substance which
could result in element contamination.
C. INSTALLATION
5. 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.
CAUTION Heaters with overtemperature devices
require specific installation orientation.
CAUTION
ELECTRIC SHOCK HAZARD Disconnect all power
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 Moisture accumulation
on the dielectric material of the elements, sheath
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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
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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.
7. 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.
8. 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.
9. 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.
10. If the heater is installed in a pressurized system, a safety relief
valve must be used to prevent a hazardous pressure buildup.
11. Horizontal element support bundles may be necessary with an
immersed length over 1270 mm (50").
12. For flange heaters installed in a pressurized system, proper
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.
13. Heaters with explosion resistant terminal housings must only
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.
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.
Description \ Installation
33
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