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Resumen del manual
INSTALLATION 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 by a qualified person in accordance with the National Electrical Code, NFPA 70. High heating efficiency, low sheath temperatures and long heater life result when electric heaters are properly installed. INSTALLATION – CLAMP-ON 1. Clamp strip heaters securely, along their entire length, to smooth metal surface. Use utility clamps spaced 5” apart and 5/16” stainless steel studs or oversized steel studs for clamping. Retighten following initial heat-up. Allow for expansion. When more that one clamp is used, tighten clamps to avoid bowing of heater, poor heat transfer and possible premature failure. Leave 1/2” space between heater ends clamped in line for expansion. Do not use mounting tabs for clamping to surface. 2. When strips are clamped to tank bottom for melting paraffin, waxes, asphalt, greases, etc., one or two strips should be clamped vertically to the tank side extending above the liquid level. This is necessary to open a passage to the tank surface for the initially melted material, and prevent build-up of pressure. 3. Clamp ring heaters to smooth metal surface. Use cast iron utility clamps with 1/4” MONEL® or stainless steel studs. Retighten following initial heat-up. 4. Tubular heaters are clamped the same as strips against the metal surface. 5. Allow a minimum of 1” air space between heaters and insulation. © 2010 Chromalox, Inc. CHROMALOX ELECTRIC HEATING ELEMENTS FOR CLAMP-ON (cont’d) WIRING ELECTRIC SHOCK HAZARD. Any installation involving electric heaters must be performed by a qualified person and must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard. 1. Electric wiring to heating elements must be installed in accordance with National Electrical Code or local electrical codes by a qualified person. 2. Temperatures at heater terminals may require use of high-temperature wire. Check factory for recommendations. 3. Maximum torque on strip heater terminals is 25 in-lbs. 4. Maximum tourque on secondary insulation bushings used in strip heater mounting is 40 in-lbs; (Part # 00036-001) PCN 255716 GENERAL INFORMATION 1. Strip heaters of equal wattage and voltage may be series connected for use on a power supply up to 480 volts. Where the power supply is greater than 480 volts (600 volt max.) series connections may be used but secondary insulation bushings must be provided. 2. Ring heaters of equal wattage and voltage with a surface temperature of less than 1000°F may be series connected for use on a power supply up to 240 volts maximum. 3. Tubular heaters of equal wattage and voltage can be series connected for use on a maximum power supply of 480 volts. Heaters for use above 480 volts must be equipped at the factory with special high voltage terminal insulation. 4. Use iron or steel sheathed heaters for temperatures up to 750°F maximum sheath temperature. Use chrome steel sheathed rings or strips for temperatures up to 1200°F maximum sheath temperature. Use alloy or Inconel® sheathed tubular heaters for temperatures up to 1500°F maximum sheath temperature. The sheath temperature is the highest temperature on the surface of the heater when operating. 5. Do not bend or form strip heaters. Do not bend tubular heaters on inside radii of less that 4”. When it is required to bend or curve strips or dish rings, or bend tubulars on small radii, consult our factory. 6. Use seamless strips where condensation, spray, oil or fumes are present. 7. Protect terminals from drippings, spray, condensation or spillover. Provide adequate electrical clearance. 8. Use manganese nickel wire or alloy bus bar for making electrical connections within the heater itself, and for bringing leads out through the insulating jacket to a cooler region where insulated copper wire may be attached. MAINTENANCE 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 by a qualified person in accordance with the National Electrical Code, NFPA 70. 1. Periodically clean terminals of dust and corrosion to maintain good electrical connections and to permit rapid heat dissipation. Use airblast and be careful to avoid damage to mica insulation. 2. Check for loose terminal connections. 2 CHROMALOX ELECTRIC HEATING ELEMENTS FOR OVEN HEATING – AIR DUCTS The electric heating element(s) supplied herein are ruggedly constructed and if properly installed, operated and maintained, are designed for long life and dependable, trouble-free service. GENERAL Temperature regulating and temperature limiting controls are recommended to be used with electric heaters to control the heating process and safeguard the electric heaters from excessive temperatures that can damage heaters. FIRE HAZARD. Since heaters...