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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 magnesium oxide in heavy wall steel sheath cast in iron. B. Large heat output at relatively low watt densities. C. Excellent heat transfer. Model Volts kW Displacement Volume (In3) Dimensions (In.) A B C D E F CIT-218 240 3 57 — 18 4-5/8 2 17-3/8 2 CIT-1612 240 5 135 12-1/4 16 2 9 10 3 CIT-1619 240 5 180 19-1/4 16 2 6 17 3 CIT-2219 240 5 145 18-1/2 12-1/2 — 6-1/2 14-1/2 — CIT-2319 240 10 180 19 15-1/4 — 9 15 — 2 Holes 9/16” Dia. 3-1/8” 4-5/8” 3-1/4” 2-1/4” Dia. Gasket - For use with CIT-218 (Figure 4) GENERAL 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 essential, including GFCI (Ground Fault Circuit Interrupters). Although the safety of the installation is the responsibility of the user, Chromalox will assist in identifying equipment options. E B F C D 1” Conduit OpeningTpye CIT-218 (Figure 3) 1-1/2” 5/8” INSTALLATION 1. Before installing the type CIT heater, inspect it for possible damage 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 excessive sheath temperatures. WARNING: When melting solids by direct immersion, a surface vent should be provided to allow gases to escape. 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 overthe- side installation. 1. To resist buoyancy of heater 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. © 2010 Chromalox, Inc. ContactorHeatingElementsGroundThermostatThreePhasePowerSupplyControlCircuitT1T2T3L1L2L3 INSTALLATION WIRING OPERATION MAINTENANCE Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at 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. 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 with local codes by a qualified per3. 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. ContactorHeatingElement(s) GroundThermostatPowerSupplyControlCircuitT1T2L1L2Diagram 1 — Single Phase Heater and Thermostat Diagram 2 — Single Phase Heater with Contactor and Thermostat Diagram 3 — Three Phase Heater Group with Contactor and Thermostat 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. 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 s...