Chromalox PN401 General, Uncrating And Handling Of Heater, Pre·Installation Check Of Heater

GENERAL

The Chromalox FXTH Flexible Tank Heater is designed for heat- ing viscous liquids in large steel, concrete or fibrous glass tanks with normal manhole entry. Standard equipment with every heater includes flexible pipe and 14’ riser(s), two lifting cables, 4” high sludge legs and a 50-250° non-indicating thermostat with well, overtemperature probe and weatherproof terminal housing.

The Control Center OCC (NEMA XII, oil and dust-tight con- struction) or WCC (NEMA IV, weather-resistant construction) is designed for controlling the temperature of the viscous liquids by reg- ulating the FXTH's on-off cycle. It is mounted remotely with standard components consisting of a NEMA XII or NEMA IV enclosure with

vertical wall mounted brackets and hasp and staple for padlocking. Electrical components include: Failsafe overheat device, master cir- cuit-breaker, contactor(s), relay(s), selector switch, pilot lights, fuses and a 120-volt control circuit transformer.

IMPORTANT-Before attempting to uncrate or install the FXTH heater, read and understand all of the following instructions. Proper handling is absolutely necessary to obtain satisfactory operation. All electrical connections are to be made by a qualified electrician. To avoid excessive separation, stratification, sludge formation, etc., in your FXTH heated storage tank, consult a qualified oil supplier regarding selection and blending of fuel oils.

UNCRATING AND HANDLING OF HEATER

NOTE: Inspect shipping crates before opening. Contact the carrier if damage is evident.

1.Check to see that all components are included. FXTH immersion heaters are shipped as subassemblies consisting of (a) flexible heater with riser tubes, (b) terminal housing, (c) thermowells and vent tube, and (d) control unit (if ordered).

2.To unpack flexible heater, keep crate in upright and horizontal position when removing heater. Only top boards of crate need to be removed.

3.When lifting heater assembly, do not bend heater to radius less than 22". Heaters should be flexed in vertical plane only. This is a plane perpendicular to the sludge leg base plates. Bending in horizontal plane can damage internal ceramic insulators.

4.Use several people to lift heater - the number depends on the length and weight of the heater. As a guide, four men should be used to lift and handle a dual tube 20 ft. unit.

5.Do not put any stress on the flexible riser tubes. These are not designed for supporting weight. The unit must be lifted by either the 3" heater tubes or the steel lifting cables furnished with heater and located at both ends of heater. See Figure A.

6.Set heater in upright position on flat surface. Avoid any lateral

bending.

CAUTION: Never drop heater or subject it to mechanical shock.

PRE·INSTALLATION CHECK OF HEATER

	Rear Lifting Cable
Overtemperature	Heater
Probes	Back End

Front Lifting Cable

Heater Front End

Sludge Leg Base Plates

Riser Unions

Figure A

Flexible

Risers

Terminal Housing

1.Mechanical

The heater assembly has undergone a rigorous leak test just prior to shipment from the factory. Visually inspect all joints and flex tube surfaces to insure no mechanical damage has incurred during shipping. Contact carrier if heater shows signs of damage. Do not attempt to install heater if damage is evident. Do not attempt to tighten or remove any of the threaded fittings in the flexible tube assembly. If the sealing performed at the factory has been broken. the unit must undergo another complete leak test supervised by an Authorized Chromalox Serviceman before installing in tank.

2.Electrical

A.Open control unit cover and examine electrical components for any damage which may have been incurred during ship- ment. Contact carrier and report any damage noted.

B.CAUTION: Retighten all electrical connections and mounted components which may have loosened during shipment.

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