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Resumen del manual
Hazardous area terminal enclosures are available, consult your local Chromalox representative for details. The NWHO-27 series is a general-purpose oil circulation heater intended for use indoors. The 27 or 36 steel sheathed tubular elements are welded to a removable steel flange and centered in a 10 inch diameter steel heating chamber. Depending upon the specifications, the NWHO-27 may or may not be factory equipped with AR or other Chromalox thermostats. Such thermostats function to control outlet temperatures and limits internal temperature under abnormal flow conditions. These controls do not fail-safe. Thermocouples are also available as an option. CAUTION: Users should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure may be severe, back-up controls are essential. Although the safety of installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations. INSTALLATION WARNING: Hazard of Shock. Disconnect all power before installing heater. 1. Vertical mounting (axis of chamber vertical as in sketch above) is preferred. (Terminal housing at top of heater) (Figure A) 2. When mounting heater horizontally, inlet and outlet MUST be up. In any other position, heater cannot be purged of air and elements may be seriously damaged. (Figure B) 3. This series of circulation heaters are provided with mounting lugs to support the heater chamber. Refer to sketch above for location of these mounting lugs. 4. Mount heaters to permit unrestrained expansion of chamber due to temperature. This can be accomplished by using a slotted mounting assembly on either of the lugs. 5. DANGER: Hazard of Fire. Provide minimum of 6” spacing from a chamber and related piping to nearest combustible material. Avoid operation of heater near combustible fluids or in combustible vapor or gas laden atmosphere. 6. Provide adequate space at terminal end to permit withdrawal of the heater from chamber should servicing be required. 7. If two or more heaters are needed to provide the needed heating capacity, arrange them for series oil flow. 8. DANGER: Possible Explosion. A pressure relief valve should be provided by customer at outlet of vessel. There should be no other valving between vessel and valve. Incorrect Correct Figure A — Vertical Mounting Correct Incorrect Figure B — Horizontal Mounting © 2010 Chromalox, Inc. WIRING WARNING: Hazard of Shock. Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard. 1. Electrical wiring to heater must be installed in accordance with the National Electrical Code and local electrical codes by a qualified person as defined in the NEC. 2. Because of the high operating temperatures expected, aluminum wiring is not recommended. 3. Refer to wiring Diagram Figure C for typical wiring used for connecting the NWHO-27 series heater. 4. Three 3 phase circuits is a typical design for these heaters. Other circuit arrangements are often supplied depending upon customer specifications or amperage rating. Check engineering drawing for specific wiring diagram of custom orders. 3L13L23L32L12L22L31L11L21L3Figure C — 240V, 480V, 3 Phase 3 Circuits OPERATION 1. Do not heat materials that are corrosive to the heating element terminals may damage heater’s electrical insulation. Liquid-tight sheath or chamber. For oil heating service, condensate drain may terminal enclosures are available to protect heater. Check factory. be provided from bottom of chamber. Check factory. 3. If foreign material is carried by the oil flow, install suitable filters 2. Terminal ends of heater must be protected from drippings conden-in the inlet pipe to the heater. sation, spray or direct spill-over of material whose presence at the 4. Do not allow heater to operate when fluid flow is interrupted. MAINTENANCE WARNING: Hazard of Shock. Disconnect all power safety limit control operation to insure accurate and safe process before servicing heater. operation. 1. Remove heating element assembly periodically to check heater 3. Check all electrical connections periodically and retighten connecsheath for corrosion or excessive oxidation. Correct operating con-tions which may have loosened in service. Replace wire terminals ditions to minimize sheath deterioration. which show signs of oxidation which would interfere with establishment of reliable electrical connections. 2. Periodically check temperature control and pressure temperature RENEWAL PARTS IDENTIFICATION Order Renewal Parts on a Special Order Basis. Give the name of the part number, voltage, and wattage to your Chromalox Representative for identification of renewal parts. Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at 2150 N. RULON WHITE BLVD., OGDEN, UT 84404Phone: 1-800-368-2493 w...