Chromalox PD441-1 User's Manual
Contents
1. must be removed from the housing An alternate procedure is to energize the heaters at low voltage until the megohm reading returns to normal When energizing heaters in air the sheath temperature should not exceed 750 F MAINTENANCE WARNING Hazard of Shock Disconnect all power to heater before servicing or replacing heaters Heaters should be checked periodically for coatings and corrosion and cleaned if necessary The tank should be checked regularly for sediment around the heater pipe insert as sediment can act as an insulator and shorten heater life Remove any accumulated sludge deposits from around pipe and from tank Check for loose terminal connections and tighten if necessary If corrosion is indicated in the terminal housing check terminal box gasket and replace if necessary Check conduit layout to cor rect conditions that allow corrosion to enter the terminal housing 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 TA Q0 EF Litho in U S A2. tions require liquid tight conduit and connectors Bring the power line wires through the opening in the terminal box Connect line wires as shown in the wiring diagram see Figure 5 240 480V Figure 5 1 2 OPERATION Do not operate heaters at voltages in excess of that stamped on the heater since excess voltage will shorten heater life Always maintain a minimum of 2 of liquid above the heater 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 TANK IS DRY Be sure all trapped air is removed from a closed tank Bleed the air out of the liquid piping system and heater housing prior to ener gizing Note The tank or heating chamber in closed tank systems must be kept filled with liquid at all times Keep heating elements above sediment deposits Low Megohm Condition The refractory materials used in electric heaters may absorb moisture during transit or when sub ject to a humid environment This moisture absorption results in a cold insulation resistance of less than twenty megohms Normally this megohm value corrects itself after heatup and does not affect heater efficiency or life A low megohm condition can easily be corrected by removing the terminal hardware and terminal enclosure and baking the heater in an oven at 350 F for several hours preferably overnight Note The lid
3. Chromalox Installation Operation and MAINTENANCE INSTRUCTIONS SERVICE REFERENCE jowision 4 secnon MTO LT__ FEREN PD441 1 REFERENCE Supersedes PD441 161 303567 001 pat MARCH 1999 Type MTO LT Pipe Insert Immersion Heater Type E2 Moisture Tight Explosion Resistant Enclosure Dim In A B MTO 241LT MTO 241LT MTO 251LT MTO 251LT MTO 275LT MTO 275LT MTO 212LT MTO 213LT WARNING Calculate and allow for thermal expansion Pipe insert will expand upon heating The rear end of the pipe insert must remain free from the tank wall Heating elements will also expand upon heating and must not extend to the end of the pipe insert Chromalox type MTO LT screwplug immersion heater is designed for insertion into a 2 or larger pipe WARNING It is the responsibility of the purchaser of the heater to make Expansion Gap 2 1 16 L D Min Pipe Support amp Tank by others the ultimate choice of pipe material based upon his knowledge of the chemical composition of the corrosive solution character of the material entering the solution and controls which he maintains on the process Chromalox cannot warrant any electric immersion heater against failure if such failure is the result of corrosion due to improper material selec tion by the user 1 Heater Construction Characteristics A High quality resistance wire held in place by compacted Ma
4. L LLL Expected Maximum Sediment Level Note Locate Heater as low as possible for maximum liquid storage capacity Heat does not move downward Figure 1 Open Tank Installation INSTALLATION 6 Heater must not be operated in sludge 7 Install the heater using a high quality pipe sealing compound on the threads Screw the heater into the opening Figure 2 Tighten sufficiently with wrench applied on the hex portion of the screw plug Approx 6 Cold WARNING Care must be taken to insure the heated portion does not extend into the coupling area see Dimensions Figure 2 Exploded View Pipe Insert Heater Mounting 8 Closed Tank Installation NOTE When heating in closed vessels controls and back up controls must be used to prevent buildup of temper ature and or pressure A Horizontal Position Figure 3 Note In a Forced Circulation System Use Pump In Inlet Side Inlet Heater Figure 3 Closed Tank in Horizontal Position Al Place heater at an elevation so that natural circulation can take 9 place A2 Position outlet and inlet in a vertical plane facing upward to prevent air pockets Be sure all trapped air is removed from the closed tank Bleed the air out of the liquid piping system and heater housing prior to operation A3 IMPORTANT Heater should never be located at the highest point in the system Provide expansion tank if necessary B Vertical Position Fi
5. gnesium Oxide Refractory enclosed in an Incoloy sheath B Low to High Watt densities C Explosion Resistant Liquid Tight E 2 terminal enclosures are standard WARNING Users should install adequate 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 the installation is the responsibility of the user Chromalox will assist in identifying equipment options INSTALLATION WARNING Hazard of Shock Disconnect all power before installing heater 1 Before installing check your type MTO LT pipe insert heater for any damage that may have occurred during shipment 2 Check to insure that the line voltage is the same as that stamped on the nameplate 3 Do not bend the heating elements If bending is necessary consult factory 4 IMPORTANT Mount heater in the tank so that the liquid level will always be above the effective heated portion of the heater see Figure 1 Jf the heater is not properly submerged it may overheat and damage the heating elements and create a possible fire hazard due to excessive sheath temperatures 5 Where work will pass over or near equipment additional protec tion such as a metal guard may be needed 2010 Chromalox Inc This Portion of Heater Above Liquid Level and Expected Low Exposed to Air Will Lead to Premature Burnout of Element Level of Liquid Daur CLLLLLLLILLLLL LL
6. gure 4 DANGER Hazard of Fire Since the heaters are Drip Loop Recommended to Minimize Passage of Moisture Along Wiring Into Terminal Wiring and Connections fF Outlet Suitable Wiring lt Inlet Maximum Sediment Level Install Heater Above Locate Drain Pi This Level But as Near to it as at Boron Eia Possible for Maximum Heated Sediment Deposits may be Solution Storage Capacity Removed Through Drain Pipe Figure 4 Closed Tank in Vertical Position capable of developing high temperatures extreme care should be taken to A Avoid contact between heaters and combustible materials B 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 accor dance with the National Electrical Code 1 Electric wiring to heater must be installed in accordance with the National Electrical Code and with local codes by a qualified person as defined in the NEC WARNING Use copper con ductors only 2 When element wattages are not equal heaters must not be connected in series 3 Electrical wiring to heater should be contained in rigid con duit or in sealed flexible hose to keep corrosive vapors and liq uids out of the terminal housing Tf flexible cord is employed a watertight connector should be used for entry of the cord into the terminal box Outdoor applica
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