WARNING: 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 ser-
viced by a qualified person in accordance with the
National Electrical Code, NFPA 70.
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.
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 conse-
quences of failure could result in personal injury or
property damage, back-up controls are essential.
1.
Electrical wiring to heating elements must be sized and installed in
accordance with the National Electric Code and applicable local
codes by a qualified person as defined in the NEC.
2.
Temperatures at the heater terminals will require the use of man-
ganese nickel or equivalent temperature lead wire. (Type TGS,
TGT, or TGGT are recommended.)
DANGER: Hazard of Explosion or Fire. 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 heat-
ing or short circuit. Unit should be installed in a horizontal position
with the thermowell on top only.
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 guide-
lines: (refer to Figure 1)
A.
Heating elements are removable through the terminal enclosure
however adequate room must be provided for this purpose. The
removal length of the OCE heating element is 3 feet since the cen-
ter 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 seal-
ing 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.
INSTALLATION
2
Allow for Tank
Insulation and Bolting
36” Min. Element
Removal Distance
Model LTFX
Tank
Fluid
Level
Open-Coil Elements
Figure 1
The Chromalox Unitary Electric 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 con-
trol 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 weld-
ed 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.
Since excessive temperatures may permanently damage the
heater and cause premature failure, the use of temperature con-
trols, limiting controls, and liquid level sensors are recommended.
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 conse-
quences of failure could result in personal injury or
property damage, back-up controls are essential.
GENERAL
WIRING
