Chromalox PG421-1 User's Manual
Contents
1. a High Temperatures will oxidize copper Use only nickel plated copper wire for supplying power to heater Do not use aluminum conductors 5 A sufficient length of this wire not less than 12 should be used to extend from each heater terminal into a connection box location where the temperature does not exceed 300 F 6 Assemble terminal screw and wire as shown in Fig 5 Figure 5 7 Hold terminal with pliers and tighten the terminal screw securely with a screwdriver Note Where circuit wiring is installed in locations of high ambient temperature conductors should be insulated in accor dance with requirements for temperature and voltage 8 SERIES CONNECTION of Radiant Heaters of equal volt and watt rating is permitted in all line voltages up to 600 volts In making such series connections it is necessary to observe the right series parallel connection rather than the wrong parallel series connection both shown in Figure 6 If heaters are connected according to the wrong illustration failure of any heater will cause progressive failure of other heaters still operating Wrong Radiant Heaters A Fa u D 12 Figure 6 9 DELTA CONNECTIONS When heaters occur in multiples of three they may be connected to and balanced across three phase lines The most commonly used connection is the delta connection illustrated in Figure 7 Three phase Delta connections to minimize inductive2. U RAD 74VLT LT 240 or 480 208 or 275 67 hs 58s U RAD 75 U RAD 75VLT LT 240 or 480 208 or 275 75h 65 s U RAD 76 U RAD 76VLT LT 240 or 480 208 or 275 81h 72 hs U RAD 77 U RAD 77VLT LT 240 or 480 208 or 275 87 s 71h INSTALLATION AWARNING ELECTRIC SHOCK HAZARD Disconnect all power before installing or servicing heater Failure to do so could result in personal injury or property dam age Heater must be installed or serviced by a qualified person in accordance with the National renee Code NFPA 70 1 Clamps Heaters are mounted by means of the mounting clamp and 4 bolt assembly which is used as shown in Fig 2 Clamp assembly may be attached to heater by sliding over end or by snapping over top of extruded frame section at any point along its length see Fig 3 For proper heater support the maximum distance between clamps must not exceed 48 On extra long heaters more than two clamps are furnished 23 8 17 8 a Figure 2 Figure 3 Mounting Holes When heaters are mounted adjacent to each other in the same plane note that distance between mounting holes on framing to support heaters will be 4 min imum When heaters are not in the same plane i e set at an angle to one another distance between mounting holes in fram ing will be either greater or less than 4 Framing Where an extensive installation is being made the use
3. 035 234 013411 036 234 013411 035 152 016963 011 Terminal Box 304 037344 001 Terminal Box Cover 080 048621 001 Threaded Fitting Gasket 132 010712 007 2 Threaded Fitting Washer 328 046907 003 2 Threaded Fitting Nut 200 046906 003 2 2 2 152 016963 012 Saddle Clamp 238 026539 001 Terminal Screw 248 046044 002 Element Support Clip 059 014304 002 Insulating Bushing 032 013454 001 Bushing Retaining Clip 059 017175 001 152 016963 013 HEATER MOUNTING CLAMP ASSEMBLY For heaters less than 74 overall length Includes two complete assemblies 168 013071 001 For heaters 744 and greater overall length Includes three complete assemblies 168 013071 002 152 016963 014 Limited Warranty Please refer to the Chromalox limited warranty applicable to this product at http www 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
4. effect in conduits are made per this diagram The rule run all 3 three phase conductors in the same conduit as far as possible For single phase run only two conductors and follow the same rule 3 Conductors in 1 Conduit Radiant FS Heaters e 3 Conductors in 1 Conduit Figure 7 OPERATION FIRE EXPOSION HAZARD This heater is not intended for use in hazardous atmospheres where flammable vapors gases liquids or other com bustible atmospheres are present as defined in the National Electrical Code Failure to comply can result in personal injury or property damage Before energizing this heater 1 Be sure all electrical connections are tightly made Hold ter minal with pliers when tightening screw 2 Be sure that all conductors are properly insulated 3 Be sure that terminal box cover has been properly replaced and that secondary insulation bushings have not been omitted Standard Radiant Heaters are built to operate at 40 watts per sq inch on the element sheath When it is desired to reduce radiant intensity one or more of the following methods may be used 1 INPUT CONTROLLERS These motor driven cycling devices can be used to vary heater output capacity from 4 to 100 They are usually connected in holding coil circuit of magnetic contactors See Chromalox Radiant Heater Manual for further information regarding Input Controllers and Contactors SOLID ST
5. of continuous slot metal framing manufactured by several concerns will be of assistance in saving time and money The framing is reusable Reflector Spacer Sheets Where heaters are not mounted side by side see Fig 4 reflector spacer sheets can be used between heaters These reflector spacer sheets and companion reflectors consisting of an extruded aluminum housing with reflector sheet and mounting clamps are available Check factory ad a Mounting Frame Reflector Spacer Sheet Figure 4 5 Insulation Where unusually high work temperatures are encountered it may be desirable to insulate behind heaters with high temperature fibrous insulation A suggested method of accomplishing this is indicated in Fig 4 6 Ventilation Where solvents water etc are being evaporat ed from work in process it is necessary to provide substantial quantities of ventilation air to carry away the resulting vapors FIRE HAZARD Since Radiant heaters are capable of developing high temperatures extreme care should be taken to A Keep combustible materials at least 6 away form sides and back of heater housing and its supporting brackets and spaced far enough in front of heater heating element side so thermal radiation from the elements will not ignite com bustible materials B If combustible materials are being processed stoppage of process should initiate immediate heater shutdown and interception of residual heat fr
6. 013411 035 234 013411 037 234 013411 032 6962 007 234 013411 034 234 013411 035 234 013411 037 234 013411 032 234 013411 035 234 013411 035 234 013411 037 234 013411 033 234 013411 035 234 013411 037 234 013411 033 234 013411 035 234 013411 035 234 013411 037 234 013411 033 234 013411 035 234013411035 234 013411 037 234 013411 034 234 013411 036 234 013411 035 234 013411 037 234 013411 036 Zt PETS 234 013411 036 234 013411 034 234 013411 037 234 013411 035 234 013411 036 234 013411 034 234 013411 034 2 6963 006 152 016963 018 152 016963 021 lt lt r 152 016963 008 lt lt 152 016963 019 152 016963 009 C CIS CCGC CIG CCOO ala NNO aoa sla NI AGN 234 013411 037 2 152 016963 020 234 013411 035 2 152 016963 010 234 013411 036 When ordering specify Model Number and Volts Ex UTU 3VLT 275V 234 013411 032 234 013411 036 234 013411 032 234 013411 036 234 013411 032 234 013411 036 234 013411 033 234 013411 036 234 013411 033 234 013411 036 234 013411 033 234 013411 036 234 013411 034 234 013411 036 234 013411 034 234 013411 036 234 013411 034 234 013411 036 234 013411 034 234 013411 036 234 013411 035 234 013411 036 234 013411 035 234 013411 036 234 013411
7. 34 013411 032 234 013411 033 234 013411 034 U 5VI U 5LT U 5VI U 5LT U 6VLT U 6L U 6VLT U 6L U 7VLT U 7LT U 7VLT U 7LT U 2LT 2 U 2VLT 2 U 2LT 2 234 013411 035 234 013411 036 234 013411 037 234 013411 032 2 6963 001 234 013411 033 234 013411 032 234 013411 033 234 013411 032 234 013411 033 234 013411 032 234 013411 033 234 013411 032 152 016963 002 D 32L D 32VLT ecle cje Eje cl ei e e cie e c e ec e e cie e e e c e ecf c eici eic e c c lc RENEWAL PARTS IDENTIFICATION a Aluminum Aluminum Volts Element Reflector Housing Volts Element Reflector Housing 234 013411 033 2 152 016963 003 234 013411 036 2 152 016963 015 234 013411 034 234 013411 037 234 013411 032 234 013411 032 234 013411 034 234 013411 037 234 013411 032 152 016963 004 234 013411032 152 016963 016 234 013411 034 234 013411 037 234 013411 032 234 013411 032 234 013411 034 234 013411 037 234 013411 033 234 013411 033 234 013411 034 234 013411 037 234 013411 033 9969 008 234 013411 033 152 016963 017 234 013411 034 234 013411 037 234 013411 033 234 013411 033 234 013411 037 234 013411 034 234 013411 037 234 013411 034 234 013411 035 234 013411 037 234 013411 032 234 013411 034 234
8. ATE THYRISTOR POWER CONTROLLERS For best non contact control of radiant heat a Series 6 Chromalox Thyristor Power Controller with manual poten D tiometer setting is recommended Truly proportional output of from 0 100 can be easily dialed in to suit the particular product or process requirements The Series 6 panels are pre engineered pre packaged assemblies in an enclosure with cir cuit disconnect provided and ready for installation Maximum Ambient Temperatures Chromalox Radiant Heaters are not recommended for applica tions in ambient temperatures exceeding 450 F Higher ambient temperatures mean shorter heater life Maximum work temperature in a given time depends on sever al factors Reflectivity of work specific heat of work mass of work kW input and losses from oven and time of exposure As work temperature increases the work loses heat by radiation and by convection to the surrounding ambient Although it is a gener al principle of Radiant Heater application that work temperature conventionally exceeds ambient temperature in cases where extremely high work temperatures are desired it is necessary to enclose the heaters in order to increase the ambient If evaporation of a liquid is desired as a result of increasing work temperature it is necessary to provide ventilation air in order to carry away the evaporated liquid Under carefully engineered circumstances a maximum work temperature of 600 F may be attai
9. Chromalox Installation Operation and RENEWAL PARTSIDENTIFICATION SERVICE REFERENCE jowision 4 secron U RAD REFERENCE Supersedes PG421 PG421 1 161 058006 001 pate APRIL 2005 Type U RAD LT Electric Radiant Heaters The Safety Alert Symbol Ais used to indicate a risk of per sonal injury Specifications Table A B Overall Heated Please familiarize yourself with these instructions before attempting to install or operate this Radiant Heater y a 3e 4 Dia Typ 34 Pipe Tap on A eo B gt Sh Back Side of A gt Heater Typ Single Element U RAD LT Model Volts Watts Length In Length In Single U Shaped Element U RAD 2LT U RAD 2VLT 120 or 240 208 or 275 13 s Bhs U RAD 3LT U RAD 3VLT 120 or 240 208 or 275 167s 11 hs U RAD 4VLT U RAD 4LT 208 or 275 240 or 480 24h 19 U RAD SVLT U RAD 5SLT U RAD 6VLT U RAD 6LT 208 or 275 240 or 480 208 or 275 240 or 480 313e 37 hs 265 32 h5 U RAD 7VLT U RAD 7LT 208 or 275 240 or 480 43 ho 385 Two U Shaped Elements Terminal Box Cover Terminal Box Mounting Clamp Assembly Polished Aluminum Reflector Figure 1 Heater Parts and Dimensions Before Installing 1 Open carton and remove heater at the place of installation Mounting clamps are in parts bag in carton 2 Check nameplate volt and watt rat
10. ing against your power sup ply voltage and heating requirements of your installation This nameplate is located on one end of the heater AWARNING The system designer is responsible for the safety of this equipment and should install adequate back up controls and safety devices with their electric heating equipment Where the conse quences of failure could result in personal injury or property damage back up controls are essential 2010 Chromalox Inc U RAD 22 U RAD 22VLT T 120 or 240 208 or 275 16 U RAD 32 U RAD 32VLT T 120 or 240 208 or 275 19 U RAD 33 LT 120 or 240 U RAD 33VLT 208 or 275 22h U RAD 42VLT U RAD 42L l 208 or 275 Tija U RAD 43VLT U RAD 43L fh 208 or 275 ren U RAD 44 U RAD 44VLT LT 240 or 480 208 or 275 sae U RAD 52VLT U RAD 52L 208 or 275 T 240 35 U RAD 53VLT U RAD 53L 208 or 275 T 240 38 U RAD 54 U RAD 54VLT LT 240 or 480 208 or 275 P U RAD 55 U RAD 55VLT LT 240 or 480 208 or 275 5 U RAD 62VLT U RAD 62L 208 or 275 T 240 41 U RAD 63VLT U RAD 63L 208 or 275 T 240 44 h U RAD 64 U RAD 65 U RAD 64VLT LT 240 or 480 U RAD 65VLT LT 240 or 480 208 or 275 523s 208 or 275 e U RAD 66 U RAD 66VLT LT 240 or 480 208 or 275 z sat U RAD 72 U RAD 72VLT or seats 208 or 275 a U RAD 73VLT U RAD 73L 208 or 275 T 240 59 346 50 U RAD 74
11. ned MAINTENANCE ELECTRIC SHOCK HAZARD Disconnect all power before installing or servicing heater Failure to do so could result in personal injury or property dam age Heater must be installed or serviced by a qualified person in accordance with the National Electrical Code NFPA 70 To Remove Heating Element Remove terminal box cover Disconnect heating element from electrical leads Remove threaded fitting nuts and washers 8 Remove element support clips and secondary insulating bushings Lift out element aABWN To Install Element Observe instructions for removing element and proceed in reverse order Be sure to replace secondary insulating bushings Care of Reflectors Reflectors should be cleaned periodically A mild soap and water solution or fine cleaning powder is best although more dras tic means may be required if reflectors are badly soiled by chemi cal or other deposits The reflector is aluminum DO NOT use alkali cleaners since alkalies will dull reflector Mild non alkaline cleaners such as used for scouring kitchen sinks may be used Reflectors are replaceable and may be purchased from Chromalox RENEWAL PARTS IDENTIFICATION Figure 8 Element assembly includes all parts shown except items and For element assembly part number and prefix R to Element part number Ex R UTU 6VLT 208V 3000W Aluminum Housing Volts Element Reflector 2
12. om radiant heaters use radiation baffles or move heaters away from work C In the case of solvents of an explosive nature ventilation air must be in sufficient volume to dilute the solvent vapor so that explosive mix tures cannot occur refer to NFPA 86 Standard for Ovens and Furnaces WIRING ELECTRIC SHOCK HAZARD Disconnect all power before installing or servicing heater Failure to do so could result in personal injury or property dam age Heater must be installed or serviced by a qualified person in accordance with the National Electrical Code NFPA 70 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 connection to the Radiant Heater is made through the 34 diameter conduit opening in the terminal box Access to Radiant Heater terminals is obtained by removing the terminal box cover Wiring should be run in flexible or rigid metal conduit and must be installed in accordance with the requirements of the National Electrical Code and such other local requirements as may be applicable Note High temperatures will oxidize cop per Do not use copper wire in connecting this heater Stranded insulated nickel plated copper wire is recommended Wires supplying power to heating element terminals shall have insulation rated for 150 C minimum D a
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