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Wiring Entrance Locations - Moisure Resistant Housing Only
(E4 Option)
The Moisture Resistant (E4) Housing offers several conve-
nient options for conduit wiring & location. The housing is
equipped with two removable service entrance plates for installa-
tion 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. When reinstalling, be sure to prop-
erly align gasket, if applicable, and tighten to 40-50 in-lbs.
Tip for Reinstalling Gaskets:
Place Allen Head screws through metal covers and gentle
push gasket hole over the threaded screw. This will allow the gas-
ket to stay in place while tightening the cover.
Wiring Entrance Locations - Explosion Resistant Housing
Only (E2 Option)
The Explosion Resistant (E2) Housing features dedicated
conduit connection sizes and locations for NPT installation of con-
duit. Wiring installation must be in accordance with Hazardous
Area requirements. The use of EYS seals or rigid conduit may be
required. Please consult with the local inspection authority.
Maximum Temperatures
Safe operation in a hazardous location requires the maximum
operating temperatures of all exposed surfaces of the heater
FIRE HAZARD. To avoid possible damage to the
heater, do not energize until the tank is filled with
fluid. Recommended fluid level is 2" above the heater
tube or pipe.
1. Do not operate heaters at voltages in excess of that stamped on the
heater, since excess voltage will shorten heater life.
2. Heaters should not be operated in environments with factors that
can destroy the electrical insulating characteristics of the ceramic
insulators. Foreign contaminants can create leakage (shock) haz-
WIRING (cont'd.)
including temperatures on the outside of the vessel, piping,
flanges, screw plugs, enclosures and other heat conducting parts be
limited. The flammable liquids, vapors or gases present determine
the maximum surface temperature permitted in any hazardous
location. The end user or purchaser of the electric heating equip-
ment is responsible for determining the proper classification of an
area and for providing Chromalox with hazardous area specifica-
tions and requirements for proper equipment design. (NEC and
IEC provide guidelines for evaluating and classifying hazardous
locations.)
An approved liquid level control or overtemperature
control must be installed to deenergize the heater if
the liquid level drops below the top of the heater.
Table A – E4 Wiring Information
Heater
LTFX-125-004E4
LTFX-128-008E4
LTFX-1212-012E4
LTFX-2212-024E4
LTFX-3212-036E4
LTFX-2325-060E4
LTFX-3325-090E4
LTFX-4325-120E4
LTFX-6325-180E4
LTFX-8325-240E4
Table B – E2 Wiring Information
Heater
LTFX-125-004E2
LTFX-128-008E2
LTFX-1212-012E2
LTFX-3210-024E2
LTFX-3215-036E2
LTFX-3225-060E2
LTFX-4225-090E2
LTFX-8215-120E2
LTFX-9220-180E2
LTFX-12225-240E2
OPERATION
ards, permanent heater damage, or cause heater failure and there-
fore should be avoided.
For initial operation and tuning the control scheme:
1. Turn the master circuit breaker off and open the control box door.
2. Set the indicating temperature control at the desired temperature
and the over-temperature cutout at 50°F above this temperature.
3. Interlock the liquid level control with the cutout device.
4. Close the control box door and turn the circuit breaker on. To ener-
gize the heater circuits, turn the on-off selector switch to the "on"
position.
kW
Volts
Phase
Total Amps
4
480
3
4.8
8
480
3
9.6
12
480
3
14.5
24
480
3
28.9
36
480
3
43.4
60
480
3
72.3
90
480
3
108.4
120
480
3
144.5
180
480
3
216.8
240
480
3
289.0
kW
Volts
Phase
Total Amps
4
480
3
4.8
8
480
3
9.6
12
480
3
14.5
24
480
3
28.9
36
480
3
43.4
60
480
3
72.3
90
480
3
108.4
120
480
3
144.5
180
480
3
216.8
240
480
3
289.0
Circuits
1
1
1
1
1
1
3
2
3
4
Circuits
1
1
1
1
1
1
2
2
3
4
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