Chromalox PD412-5 User's Manual
Contents
1. Heating Thermostat ee rere gt LI Power 12 Supply Heating Element s P11 Power gt 2 Supply E Control ee gt Circuit l Thermostat Diagram 2 Single Phase Heater with Contactor and Thermostat sonas defined in the NEC 2 When element wattages are not equal heaters must not be connect ed in series 3 Electrical wiring to heater should be contained in rigid conduit or in sealed flexible hose to keep corrosive vapors and liquids out of the terminal housing If high humidity is encountered the conduit should slope away from the heater 4 If flexible cord is employed a watertight connector should be used for entry of the cord into the terminal box Outdoor applications require liquid tight conduit and connectors 5 Bring the power line wires through the opening in the terminal box Connect line wires as shown in the appropriate wiring diagrams see Diagrams 1 2 and 3 Heating Elements Lossa pps Ground Diagram 3 Three Phase Heater Group with Contactor and Thermostat OPERATION 1 Do not operate heaters at voltages in excess of that stamped on the heater since excess voltage will shorten life 2 Always maintain 6 to 8 of liquid above the heated portion of the element to prevent exposure of the effective heated length If the heater is not properly submerged it may overheat and shorten heater life DO NOT OPERATE HEATER IF DRY 3 Sludge should not be allowed to2. Large heat output at relatively low watt densities C Excellent heat transfer D A rugged cast iron terminal box protects the terminals against spillage and abuse WARNING 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 essen tial including GFCI Ground Fault Circuit interrupters Although the safety of the installa tion is the responsibility of the user Chromalox will assist in identifying equipment options INSTALLATION 1 Before installing the type CIT heater inspect it for possible dam age which may have occurred during shipment Also check to insure that the line voltage is the same as that stamped on the nameplate 2 CAUTION Mount heater in the tank so that the liquid level will always be above the effective heated portion of the heater If the heater is not properly submerged it will overheat and damage the heating elements and create a possible fire hazard due to exces sive sheath temperatures WARNING When melting solids by direct immersion a surface vent should be provided to allow gases to escape 2010 Chromalox Inc A Over the Side Models CIT 1612 and CIT 1619 see Figure 1 for use in flat bottomed and straight sided vessels CIT 2219 and CIT 23 19 See Figure 2 for use in sloping vessels are designed for over the side installation 1 To resist buoyancy of hea
3. Chromalox Installation and OPERATING INSTRUCTIONS SERVICE REFERENCE omsong senon CIT REFERENCE Supersedes PD412 4 PD412 5 161 049179 001 MAY 1999 DATE Type CIT Cast Iron Metal Melting Immersion Heaters Maximum Melt Temperature 950 F Type CIT 1612 and CIT 1619 Figure 1 in _ A 1 Conduit Opening Fake i _______ Effective Heated Length Heated Length a 1 Conduit Opening F E e Length et a a a r C 5 8 gt 1 Conduit L Specifications Volume w a se ecefole F cir 218 240 3 5 PA 17 38 2 cm 1612 240 5 135 1244 16 2 9 10 3 cit 1619_ 240 5 180 potaj 16 2 6 17 3 240 18 1 212 1 2 CIT 2319 6 1 2 al Tpye CIT 218 Opening Type CIT 2219 and CIT 2319 Figure 3 Gasket For use with CIT 218 Figure 2 Figure 4 GENERAL WARNING Hazard of Shock Disconnect all power before installing servicing or replacing heaters Chromalox Cast Iron Immersion Heaters are generally used for metal melting applications such as solder lead tin stereotype metal babbitt with 4 or less copper and other soft metals where maximum working temperature is 950 F Note Not suitable for immersion in zinc or aluminum 1 Heater Construction Characteristics A High quality resistance wire held in place by compacted mag nesium oxide in heavy wall steel sheath cast in iron B
4. buildup to the point where it con tacts heater as this can lead to premature heater failure 4 Buildup of dross accumulation on the surface of liquid metal should be prevented to insure satisfactory operation of the heater 5 When melting solids by direct immersion a surface vent should be provided to allow gases to escape MAINTENANCE WARNING Hazard of Shock Disconnect all power to heater before servicing or replacing heaters 1 Heaters should be checked periodically for coatings and corrosion and cleaned if necessary 2 The tank should be checked regularly for sediment around the heater as sediment can act as an insulator and shorten heater life 3 Remove any accumulated sludge deposits from heater and from tank 4 Check for loose terminal connections and tighten if necessary 5 If corrosion is indicated in the terminal housing check terminal box gasket and replace if necessary Check conduit layout to correct con ditions that allow corrosion to enter the terminal housing 6 Clean terminal ends of all contamination Limited Warranty Please refer to the Chromalox limited warranty applicable to this product at http Awww chromalox com customer service policies termsofsale aspx Chromalox PRECISION HEAT AND CONTROL 2150 N RULON WHITE BLVD OGDEN UT 84404 Phone 1 800 368 2493 www chromalox com 99 058 TA S9 EF Litho in U S A
5. ter in heavy metals securely mount heater to metal crucible by clamping CAUTION Do not support or suspend heater by the tubular section adjacent to the terminal box as the tubular section will be damaged by bending INSTALLATION B Through the Wall Model CIT 218 Figure 3 is designed for through the wall installation 1 To install drill three holes in side of crucible at proper height using hole dimensions shown in Figure 4 or by using gasket enclosed with heater as a template 2 Insert heater first through gasket and then through tank wall opening making sure that gasket is firmly seated between heater flange and tank wall 3 Using standard hardware bolts and nuts consistent with the hole diameter and the tank wall thickness secure heater into place DANGER Hazard of Fire Since these heaters are capable of developing high temperatures extreme care should be taken to A Avoid installing heaters in an atmosphere containing combustible gases and vapors B Avoid contact between heater and combustible material C Keep combustible materials far enough away to be free of the effects of high temperatures WIRING WARNING Hazard of Shock Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code to elimi nate shock hazard 1 Electrical wiring to heater must be installed in accordance with the National Electrical Code and with local codes by a qualified per
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