Chromalox PN403-1 Operation, Table a E4 Wiring Information Heater Volts Phase, Circuits

WIRING (cont’d.)

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

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	kW	Volts	Phase	Total Amps	Circuits
LTFX-125-004E4	4	480	3	4.8	1
LTFX-128-008E4	8	480	3	9.6	1
LTFX-1212-012E4	12	480	3	14.5	1
LTFX-2212-024E4	24	480	3	28.9	1
LTFX-3212-036E4	36	480	3	43.4	1
LTFX-2325-060E4	60	480	3	72.3	1
LTFX-3325-090E4	90	480	3	108.4	3
LTFX-4325-120E4	120	480	3	144.5	2
LTFX-6325-180E4	180	480	3	216.8	3
LTFX-8325-240E4	240	480	3	289.0	4
Table B – E2 Wiring Information
Heater	kW	Volts	Phase	Total Amps	Circuits
LTFX-125-004E2	4	480	3	4.8	1
LTFX-128-008E2	8	480	3	9.6	1
LTFX-1212-012E2	12	480	3	14.5	1
LTFX-3210-024E2	24	480	3	28.9	1
LTFX-3215-036E2	36	480	3	43.4	1
LTFX-3225-060E2	60	480	3	72.3	1
LTFX-4225-090E2	90	480	3	108.4	2
LTFX-8215-120E2	120	480	3	144.5	2
LTFX-9220-180E2	180	480	3	216.8	3
LTFX-12225-240E2	240	480	3	289.0	4

OPERATION

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-

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.