Chromalox SDRA-RG User's Manual
Contents
1. L1 o o4 L2 0 0 L3 oo in foo banigi 9 s 434 4 Gyo iatis Control Enclosure Run these Wires through 1 4 Conduit Run these Wires Through 1 2 Conduit c Green Pilot Ligh Heater Terminal Box One end attached 0 screw in terminal box and other end attached to screw on sub panel Amber Pilot Light SDRA 48kW 480V 3PH et Thermostat Outlet Thermostat Cutout Toggle Switch me Wht 50 Amp Fusin Pos ny nj E a Amp Fusing l oA o l oA o Poo So Control Enclosure Run these Wires through 1 4 Conduit Heater Terminal Box One end attached to screw in terminal box and other end attached to screw on sub panel SDRA 60kW 480V 3PH PARTS LOCATION Front of Heater oo S 25 W Li G N W NN View Showing Element Placement and Routing of Thermostat Capillary and Mounting of Bulb Element Assembly 48kW I 201 2 4 Front of m mM pa Heater s SAH i A i SIS D 7 f 25 b ZH t Twist Wire View Showing Element P2. 220 019122 010 193 121843 232 072 304551 008 2 315 304252 001 129 025643 001 2 128 026510 006 6 303 047468 004 193 121843 233 072 304551 008 2 315 304252 003 129 025643 001 2 128 026510 006 6 303 047468 004 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
3. 304252 001 129 025643 001 118 304793 012 3 118 304793 014 6 6 6 193 121843 233 072 304551 008 2 315 304252 003 129 025643 001 128 026510 005 3 303 047468 004 128 026510 005 3 303 047468 004 118 304793 011 6 118 304793 013 6 118 304793 012 6 118 304793 014 6 Wired directly to contactor All units contain two sets of elements The ratings of the elements on the discharge end have a lower wattage than the elements on the inlet end of heater The ends of the elements are color coded the lower wattage are color coded yel a Lower wattage elements discharge end yellow coded b Higher wattage elements fan end blue coded ow and the higher wattage are color coded blue PARTS COMMON TO ALL UNITS Description Temperature Control Part No 300 019560 002 Hi Limit Cut out 300 049200 004 Toggle Switch 292 046123 001 Blower Assembly 021 304823 009 Inlet amp Outlet Grille 134 304780 002 2 Caster Locking Handle Right Side 375 122535 007 139 304779 003 Handle Left Side 139 304779 004 Semipneumatic Wheel 333 557518 004 2 Pulley Var Pitch 7 8 225 305091 004 Pulley Var Pitch 5 8 225 305091 003 Pulley Belt Pilot Light Green 017 049702 009 213 122066 043 Pilot Light Amber 213 122066 042 Thermostat Knob 169 300468 003 Thermostat Label
4. 1 ae Vl T te Duct Adapter Adjustable Damper Adjustable Damper and Duct Adaptor 3 FAN SPEED ADJUSTMENTS ee the Pitch Diameter of the Sheaves Tools required 5 32 allen wrench 3 8 nut driver 9 16 box wrench and a medium size phillips screwdriver 2 Remove the lower belt cover by removing the 5 sheet metal screws 3 Remove the rear grille by removing the 4 1 4 bolts and nuts 4 Remove the belt cover inside the blower by removing the 4 sheet metal screws 5 Loosen the 4 bolts 2 on each side See Fig 1 Figure 1 6 Loosen the 2 motor tension lock nuts and the fan belt tension adjusting bolts See Fig 2 Figure 2 Fan belt tension adjusting bolts 7 Loosen the set screw on the fan pulley or motor pulley Fig 3 shows the construction of the fan pulley the motor pulley is the same construction Figure 3 Fan belt tension adjusting bolts 8 Rotate the front half of the pulley clockwise until it bottoms then rotate counter clockwise until the set screw aligns with the flat in the threaded half of the pulley The pulley is now in position for adjustment See Table 1 for the number of turns out Tip Leave allen wrench in set screw and use free hand to fold fan blade Table 1 No of turns from full closed ran No of turns from full closed Motor Pulley Fan Pulley RPM Motor Pulley Fan Pulley 9 Retighten set screw use of threa
5. Chromalox Installation Operation and RENEWAL PARTS IDENTIFICATION SERVICE REFERENCE ovision 4 section SDRA REFERENCE Supersedes PF499 1 PF499 2 161 304812 003 DATE AUGUST 2010 Portable Industrial Unit Blower Air Heater Types SDRA and SDRA RG Specifications Table 1 Electrical Data 60 Hz Dimensions In kW 3 Phase Amps 37 2 BTU Height Width 38 5 SDRA 30 43 SDRA 30 93 600 3 30 0 102 360 102 360 38 5 38 5 SDRA 60 43 73 3 38 5 204 720 4 4 6 SDRA 60 93 6 0 3 0 3 SDRA 48 93 600 8 3 47 3 163 776 0 0 58 9 204 720 GENERAL IMPORTANT SAVE THESE INSTRUCTIONS RISK OF FIRE Do not use as a residential or house hold heater Hazard of Fire or Discoloration of Temperature Sensitive Fabrics Do not use as a residential or household heater Keep combustible material and 2010 Chromalox Inc such fabrics away from heater Do not operate heater where flammable vapors gases or liquids are present Heaters in the heat mode should not be operated in room temperatures above 130 F Fan motor is not designed to operate in ambients below 10F To avoid personal injury read IMPORTANT INSTRUC TIONS on page 2 before installation or operation of heater Keep electrical cords and combustible materials such as drapes and other furnishings away from heater IMPORTANT INSTRUCTIONS When using electrical appliances bas
6. d locking compound is recom mended 10 Adjust fan belt tension see Fig 2 A 1 2 of belt deflection is rec ommended Tighten lock nuts 11 Tighten the 3 8 bolts see Fig 1 12 Rotate fan blade to make sure the fan belt does not rub 13 Reinstall top belt cover grille and lower belt cover Tip Installing the grille before installing the lower cover makes it easier to access the two lower grille bolts Attach all Wires on this Side of Contactor to Auxillary Terminals Run these Wires Through 1 2 Conduit WIRING DIAGRAMS Inlet Thermostat Outlet Thermostat Cutout eae eH oggle Switc OOo Motor Relay 10 Heater Terminal Box Front of Heater k i VLL 7 ransformer Control Enclosure Run these Wires hrough 1 Conduit Green Pilot Ligh Amber Pilot Light SDRA 30kW 480V 3PH Inlet Thermostat Outlet Thermostat Toggle Switch os o_o so Wht 30 Amp Fusin ransformer Contactor ea S fi Po S o LoAJC o 45 Amp Fusing
7. f modified to vary the fan speed There may be some circumstances where the use of short lengths of duct may not create sufficient pressure drop to achieve the desired tem perature rise This may also be the case of using the unit without a duct This insufficient static pressure drop may result in high air flow with the maximum temperature rise below the desired level even after the fan speed has been reduced to the minimum rpm An accessory AD 16 adjustable damper is available and can be attached to the heater to produce a static load ranging from 1 to 19 FbO which will act to reduce the amount of air flow The Friction Loss Graph 4 provides the actual test data on the friction loss for the AD 16 damper attachment The losses are stated as the equivalent length in feet of 20 duct Friction Loss AD 16 Damper Damper Full Closed E Damper Full Open m c D er o 3 a c E c uw 0 1400 1600 1800 2000 2200 2400 Fan RPM The SDRA Dragon includes 2 thermostats The thermostat on the air inlet end of the unit is for the minimum air temperature desired The thermostat on the discharge end of the heater is for the maximum air temperature desired The two thermostats are wired in series with the heating element contactor coil The temperature range of both ther mostats is 60 180 F ACCESSORIES Front of Heater SS sS D po
8. ic precautions should always be followed to reduce the risk of fire electric shock and injury to persons including the following 1 Read all instructions before using this heater 2 This heater is hot when in use To avoid burns do not let bare skin touch hot surfaces If provided use handles when moving this heater Keep combustible materials such as furniture pillows bedding papers clothes and curtains at least 3 feet 0 9m from the front of the heater and keep them away from the sides and rear 3 Extreme caution is necessary when any heater is used by or near children or handicapped individuals and whenever the heater is left operating and unattended 4 Always disconnect heater when not in use 5 Do not operate any heater with a damaged cable or plug or after the heater malfunctions has been dropped or damaged in any manner Return heater to authorized service facility for examination elec trical or mechanical adjustments or repair 6 Do not use outdoors 7 This heater is not intended for use in bathrooms laundry areas and similar indoor locations Never locate heater where it may fall into a bathtub or other water container WI 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 effectively grounded in accordance with the National Electrical Code NFPA 70 1 Use heater only on the voltage and fre
9. lacement and Routing of Thermostat Capillary and Mounting of Bulb Element Assembly 60kW Back of Heater Motor Pulley Side View Detail Showing Pulley and Belt Installation t6 Side View shown with Heater and Control Terminal Box Covers Removed All Sizes MAINTENANCE ELECTRIC SHOCK HAZARD Disconnect heater from power supply before servicing and or inspecting the heater failure to do so may result in electrical shock Replace or repair damaged cords or plugs immediately Check tight ness of all electrical connections prior to energizing Dragon Blow out or vacuum away any dirt or debris that may have accumulated around the control enclosure fan motor or heating elements RENEWAL PARTS IDENTIFICATION Model No SDRA 30 43 SDRA 30 93 Element 11 Part No 118 304793 011 3 Element 12 118 304793 013 3 Motor 16 Part No 193 121843 232 193 121843 233 Part No Contactor 20 Part No 072 304551 008 072 304551 008 Transformer 21 Part No 315 304252 001 315 304252 003 Fuse Block 80 Part No N A N A Fuse 81 Part No N A N A Term Block 84 Part No N A N A 118 304793 012 3 118 304793 014 3 SDRA 48 43 SDRA 48 93 SDRA 60 43 SDRA 60 93 118 304793 011 3 118 304793 013 6 3 3 3 193 121843 232 072 304551 008 2 315
10. nnections are made Refer to Table A for proper size SO grade of cable A proper strain relief must be used with SO grade cable Dragon heaters are factory pre wired for 3 phase delta operation Some units can be converted to single phase operation by chang ing the wiring The appropriate wiring diagram is also located on the back of the wiring compartment cover SUE Cord Preparation for Chromalox Portable Heaters l Determine the gage and number of conductors from the tabulation below using amps and phase from the heater nameplate It is not recommended that cord exceed 50 feet in length Min Wire Size SDRA 30 43 6 Ga SDRA 30 63 8 Ga SDRA 48 43 4 Ga SDRA 48 63 4 Ga SDRA 60 43 2 Ga SDRA 60 63 4 Ga SET UP AND OPERATION The SDRA SuperDragon is designed to be used with 20 diameter flexible duct A feature of the heater is that the fan speed can be easily adjusted from 1500 to 2300rpm SDRA heaters are shipped from the factory with the fan speed set at 1800 rpm The maximum external static load for the blower is 38 H2O regardless of the fan speed selected The outlet temperature is controlled by a built in thermostat ic control the maximum outlet temperature is a function of the kW rat ing and the amount of air cfm flowing through the heater The addi tion of flexible duct will provide additional static load resulting in a lower cfm the lower air fl
11. ow will reaise maximum outlet temperature until the static load reaches 38 H O Exceeding the maximum static load will result in the tripping of the overtemperature control The per formance range of the SDRA units is as shown in table B The motor and fan have variable pitch pulleys for changing the air flow and the AT Graphs 1 2 and 3 provide the performance data for Table B Max AT at Max Fan RPM Static Load Static Load 38 H20 38 H20 38 H20 each size heater at the recommended minimum medium and maxi mum fan speeds The curves end at the point where the 38 H20 stat ic load has been reached The temperature rise is based on using Chromalox 20 diameter FX 20 flexible duct The performance curves were determined by actual testing therefore using flexible duct not supplied by Chromalox may vary the results The introduction of bends in the ducting will add static load equivalent to adding 15 feet of duct length for each 90 bend and 25 feet of duct length for each 180 bend Temperature Rise vs Duct Length Temperature Rise F 75 100 125 Duct Length in Feet Duct Length in Feet Temperature Rise vs Duct Length 60 kW 50 75 100 125 Duct Length in Feet Rear of Heater 1 4 20 Wing nut Provided with AD 16 WIRING cont d SDRA heaters can be easily field i
12. quency specified on the nameplate 2 All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person 3 Branch circuit wire for connection to heater must be at least 90 C wire 4 The top access panel is secured by 4 screws that must be loosened to gain access Table A Model Number 8 Do not run cord under carpeting Do not cover cord with throw rugs runners or the like Arrange cord away from traffic area and where it will not be tripped over 9 To disconnect heater turn thermostat off then remove plug from outlet 10 Connect to properly grounded outlets only 11 Do not insert or allow foreign objects to enter any ventilation or exhaust opening as this may cause an electric shock fire or dam age the heater 12 To prevent a possible fire do not block air intakes or exhaust in any manner Do not use on soft surfaces like a bed where opening may become blocked 13 A heater has hot and arcing or sparking parts inside Do not use it in areas where gasoline paint flammable liquids are used or stored 14 Use this heater only as described in this manual Any other use not recommended by the manufacturer may cause fire electric shock or injury to persons 15 This heater is not intended for use with an extension cord 16 SAVE THESE INSTRUCTIONS RING 5 A ground terminal is provided near the power terminal board The ground wire should be connected before other co
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