Chromalox PN403-1 User Manual
LTFX
Electric Tank
Immersion Heaters
Installation Instructions
PN403-3
161-049178-101
1
April 2013
LTFX
Electric Tank Immersion Heater Installation Instructions
General
The Chromalox Electric Tank Immersion Heater, Model
LTFX, is an engineered, pretested package designed to
give years of virtually maintenance free service and it is
shipped ready for installation into a storage tank. LTFX
provides low watt-density heating over a large heating surface with precise temperature control for such
materials as asphalt, fuel oil, pitch and tar, liquid sugar,
lube oils, linseed oil, biodiesel, glycerin, ethanol and
many other heat sensitive compounds.
The open coil heating elements (OCE) are housed in
either 2” or 3” Schedule 40 carbon or stainless steel
pipes, which are welded into the 150# ANSI flange.
Once the Unitary Immersion Heater is mated to your
tank, the heating elements may be removed and replaced without draining the tank.
Installation
Since excessive temperatures may permanently damage the heater and cause premature failure, the use of
temperature controls, limiting controls, and liquid level
sensors are required.
The system designer is responsible for the
safety of this equipment and should install adequate back-up controls and safety devices
with their electric heating equipment. Where
the consequences of failure could result in personal injury or property damage, back-up controls are essential.
FIRE OR EXPLOSION HAZARD: The tank must
be purged of all flammable vapors prior to cutting or welding.
High heating efficiency, low element temperatures, and
longer heater life are achieved when the unit is properly
installed.
1. To avoid chipping or cracking, precaution should be
taken while unpacking, handling, and installing the
ceramic insulators. Heaters with damaged insulators should be returned to the factory for repair or
replacement. Contact your local sales office for return authorization.
2. The LTFX unit must not be mounted in the vertical
position as the resistance wire on the OCE element
can sag, thus causing uneven heating or short circuit. Unit should be installed in a horizontal position
with the thermowell on top only.
FIRE OR EXPLOSION HAZARD: Mount the heater in a level, horizontal orientation only. All
other orientations may result in property damage or personal injury.
3.
IMPORTANT: Mount heater in the tank so the liquid
level will always be above the effective heated portion
of the heater. Provide expansion tank if necessary.
4. Select a location for this installation according to
the following guidelines: (refer to Figure 1)
A. Heating elements are removable through the ter-
minal enclosure however adequate room must
be provided for this purpose. The removal length
of the OCE heating element is 3 feet since the
center section may be bent on a 12” radius. OCE
elements should only be bent in a vertical plane
with ground strap on the bottom.
B. The neck on the tank’s mating flange should be
of adequate length to accommodate tank insulation and flange bolting.
5. Tube supports (internal to the tank) should be
placed approximately three feet from the ‘wet-side’
of the LTFX flange to ensure gasket sealing integrity.
Additional tube supports can then be spaced on 10
foot centers. Do not anchor the heater tubes to the
supports, as the tubes must be allowed to expand.
6. To ensure proper sealing, a material appropriate
gasket needs to be installed between the mating
flanges. The mating flanges should then be secured
by tightening the bolting according to TEMA Standards.
7. A tank suction pipe should be mounted at least 2”
above the level of the heaters. A separate line can
be provided to drain tank after heaters have been
de-energized.
2
Allow for Tank
Insulation and Bolting
36” Min. Element
Removal Distance
Open-Coil Elements
Figure 1
Wiring
ELECTRIC SHOCK HAZARD. Disconnect all
power before installing or servicing heater.
Failure to do so could result in personal injury
or property damage. Heater must be installed
or serviced by a qualified person in accordance
with applicable National Electric Codes, NFPA
70 and/or International Electric codes.
Fluid
Level
Model LTFX
1. Electrical wiring to heating elements must be sized
and installed in accordance with applicable National
Electric Codes, International Electric Codes and/or
and applicable local codes by a qualified person as
defined by the code.
2. Temperatures at the heater terminals will require the
use of manganese nickel or equivalent temperature
lead wire. (Type TGS, TGT, or TGGT are recommended.)
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed
by a qualified person and must be effectively
grounded in accordance with applicable National Electric Codes and/or International Electric Codes to eliminate shock hazard.
The system designer is responsible for the
safety of this equipment and should install adequate back-up controls and safety devices
with their electric heating equipment. Where
the consequences of failure could result in personal injury or property damage, back-up controls are essential.
Wiring Entrance Locations - Moisture
Resistant Housing Only (E4 Option)
The Moisture Resistant (E4) Housing offers several
convenient options for conduit wiring & location. The
housing is equipped with two removable service entrance plates for installation of wiring. Any or all of the
six sides can be used for wiring locations. Refer to exploded view drawing. The housing can also be rotated
(by removal from flange) to allow for more position
possibilities. To install service entrance holes, simply
remove the side Allen screws and use the centering
depression to drill the appropriate size hole. Reinstall
the gasket(s), if applicable, and service entrance plates
by tightening the Allen head screws to 4-5 in/lbs. The
‘Octobox’ style of housing can be removed for ease of
access to element bussing or to better locate the power conduit(s) entry point. To accomplish, simply remove
the Allen-head screws on the outside of the housing.
3
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