Assessments - 2, GPA: 3.5
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FIRE HAZARD. Since heaters are capable of developing high temperatures, extreme care should be taken to: Since these heaters are capable of developing high temperatures, extreme care should be taken to: A. Avoid contact between heater and combustible material. B. Keep combustible materials far enough away to be free of the effects of high temperatures. 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. Electrical wiring to heater must be installed in accordance with the National Electrical Code and local electrical codes by a qualified person. 2. When element wattages are not equal, heaters must not be connected in series. Representative wiring diagrams for heaters with Single use fuse (F) or Resetable fuse (RF) — Single phase heater circuit using a SPST thermostat. Line Voltage and/or current do not exceed thermostat or thermal fuse rating (Figure 3). GroundL2L1ThermostatThermal FuseHeaterBlackBlackGreenFusedDisconnect(Customer Supplied) ** Figure 3 One Single phase heater or (3) single phase heaters equal in size and each having a thermal fuse wired as a 3 phase heater circuit using a DPST thermostat. Line voltage and current do not exceed thermostat or thermal fuse(s) rating (Figure 4). Dotted line and L3 indicate 3 phase connections. GroundL2ThermostatThermal FusesBlackBlackGreenFusedDisconnect(Customer Supplied) * * * * * * L3L1HeaterBlackFigure 4 Single phase or 3 phase heater circuit. Line voltage and/or current exceeds thermostat or thermal fuses ratings (Figure 5). Dotted line and L3 indicate 3 phase connections. Fused Disconnect(Customer Supplied) GroundL3L2L1L2L1** ThermostatThermal FusesMagneticContactorBlackBlackHeaterBlackGreenFigure 5 Flexible Conduit Fittings — LocknutWasherBodyFerruleInsertSealingInsertNutConduit 1. Cut conduit. Slide nut and sealing insert onto the conduit. 2. Screw the ferrule insert into one end of the flexible conduit. 3. Seat the ferrule insert inside of the body, seat the sealing insert and hand tighten the cap onto the body. 4. Repeat steps 1 thru 3 above for the other end of the conduit, after pulling the wires. 5. If the fitting is used in a threaded hole, first thread the body into the hole then follow steps 1 thru 3. 6. If the fitting is used thru an opening* use the locknut and plastic washer to fasten it. * Opening for 1/2” NPT thread is 7/8”. OPERATION 1. Do not operate heater at voltages in excess of that stamped on the 3. Sludge should not be allowed to build-up to the point where it heater since excess voltage will shorten heater life. contacts heater, as this can lead to premature heater failure. 2. Always maintain a minimum of 2” of solution above the heated Sludge legs are standard on L-shaped heaters. Heater must not be portion of the element to prevent exposure of the effective heated operated in sludge. length. If the heater is not properly submerged, it may overheat, create a hazard of fire and shorten heater life. Do not operate heater if dry. MAINTENANCE 1. Heaters should be checked periodically for coating and corrosion buildup and cleaned if necessary. ELECTRIC SHOCK HAZARD. Disconnect all power 2. Tank should be checked regularly for sediment around the elebefore installing or servicing heater. Failure to do ments, as sediment can act as an insulator and shorten heater life. so could result in personal injury or property dam-3. Check for loose terminal connections. age. Heater must be installed by a qualified per-4. If corrosion or moisture is indicated in the terminal housing, son in accordance with the National Electrical check the conduit layout to correct the conditions that allow cor- Code, NFPA 70. rosion or moisture to enter the terminal housing. THERMAL FUSE INSTALLATION/REPLACEMENT 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. The Thermal fuse device must be properly installed and these procedures followed or heater failure or fire may result. A liquid level control is a must as an additional safety feature to help minimize the possibility of fire. 1. Make sure all electrical power to the heater is shut-off. 2. Unscrew the head cover. Remove the wire nuts from the fuse leads and save for re-use. 3. Remove the “Sealing Putty” and pull the Thermal fuse out of its well. Clean the “putty” out of the well and save for re-use. 4. Check the Thermal fuse and the inside of the well to see if it is wet. If wet inside, dry out well. Immerse the tube into the solution. If moisture appears again inside the well DO NOT use the heater! Call the factory for further advice. 5. If the removed Thermal fuse is dry, proceed by using it as a guide to cut and strip the wires of the...
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