Chromalox PN403-1 specifications General, Installation, Wiring

GENERAL

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.

INSTALLATION

		A. Heating elements are removable through the terminal enclosure
		however adequate room must be provided for this purpose. The
DANGER: Hazard of Explosion or Fire. The tank must		removal length of the OCE heating element is 3 feet since the cen-
be purged of all flammable vapors prior to cutting or		ter section may be bent on a 12” radius. OCE elements should only
welding.		be bent in a vertical plane with ground strap on the bottom.
	High heating efficiency, low element temperatures, and longer	B. The neck on the tank’s mating flange should be of adequate length
heater life are achieved when the unit is properly installed.		to accommodate tank insulation and flange bolting.
1.	To avoid chipping or cracking, precaution should be taken while	5. Tube supports (internal to the tank) should be placed approximately
	unpacking, handling, and installing the ceramic insulators. Heaters	three feet from the ‘wet-side’ of the LTFX flange to ensure gasket seal-
	with damaged insulators should be returned to the factory for repair or	ing integrity. Additional tube supports can then be spaced on 10 foot
	replacement. Contact your local sales office for return authorization.	centers. Do not anchor the heater tubes to the supports, as the tubes
2. The LTFX unit must not be mounted in the vertical position as the		must be allowed to expand.
	resistance wire on the OCE element can sag, thus causing uneven heat-	6. To ensure proper sealing, a material appropriate gasket needs to be
	ing or short circuit. Unit should be installed in a horizontal position	installed between the mating flanges. The mating flanges should then
	with the thermowell on top only.	be secured by tightening the bolting according to TEMA Standards.
3.	IMPORTANT: Mount heater in the tank so the liquid	7. A tank suction pipe should be mounted at least 2” above the level of the
	level will always be above the effective heated portion	heaters. A separate line can be provided to drain tank after heaters have
	of the heater. Provide expansion tank if necessary.	been de-energized.

4.Select a location for this installation according to the following guide- lines: (refer to Figure 1)

Allow for Tank
Insulation and Bolting
36” Min. Element	Fluid
Removal Distance
	Level
Open-Coil Elements	Model LTFX
	Tank
	Figure 1
	WIRING

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.)

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