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WMMMWB Kewanee Scotch Generator FOR NO. 6 OR LIGHTER OIL - GAS - COMBINATION GAS-OIL AMERiCAN-<Standard DETROIT 32, MICHIGAN 28676 BULLETIN 1749D (1963 - REVISED) Kewanee Scotch Generator SCOTCH GENERATOR FEATURES WETBACK DESIGN Rear combustion chamber is completely im mersed in water . . . insures maximum primary heating surface. . . eliminates refractory baffles that can burn out and short circuit hot gases to stack . . . reduces stresses and strains due to uneven expansion and contraction by providing a separate rear tube sheet for each pass of tubes. THREE-PASS DESIGN Longer gas travel and maximum heat transfer . . . combustion gases make three passes . . . furnace tube, direct fire tubes and return fire tubes. Construction meets or exceeds ASME Boiler Code requirements. TOP REAR SMOKE OUTLET Integral part of the boiler shell . . . ideally lo cated for stub stack application and minimum interference with piping. WATER HEATING COILS Standard Kewanee "KOI" (instantaneous) and "KOT" (tank) coils are available for all low pressure units. LARGE FURNACE TUBE Provides greater proportion of primary heating surface . . . abundant volume for complete com bustion and quiet operation . . . fuel is burned completely before gases enter rear uptake. FORCED DRAFT OPERATION Belt-driven heavy duty blower assures ample supply of combustion air for stub stack appli cations. Special assemblies are available for high altitude installations. LARGE STEAM SPACE Combined with abundant unbroken disengaging area and large water content, an integral steam separator assures steady water line and dry steam. TUBES All fire tubes are set in tube sheets by roller expander. No tubes are welded to tube sheets. WELDED SHELL Flange quality plate. Heads and furnace tube are firebox steel. High pressure shells are x-rayed and stress relieved. INSULATED STEEL JACKET Factory installed heavy gauge aluminum en ameled steel jacket with glass or mineral fiber insulation and reinforced catwalk area. -2 - EASY MAINTENANCE Large access openings in rear combustion chamber and smokebox make rear tube sheets readily accessible for inspection. Large insu lated gas-tight front doors permit easy inspec tion of front tube sheet and cleaning of tubes without disturbing burner equipment. PROVED DEPENDABILITY - PEAK PERFORMANCE Modern concept based on experienced engineer ing - conservative design and top quality con struction - assure highest efficiency, faithful performance, long dependable service. Ratings are conservative - five square feet of fireside heating surface per horsepower - provides ade quate reserve capacity. Firing rates are care fully matched to heating surface. Flame size and shape are matched to furnace dimensions. These combined features assure minimum operating efficiency of 80%. ONE SOURCE RESPONSIBILITY The entire generator is listed by the Under writers' Laboratory (UL). Undivided responsi bility for the complete unit. Boiler, burner, controls, accessory equipment ... by Kewanee the recognized leader in steel boilers for nearly a century. 28677 Kewanee Scotch Generator KEWANEE BURNERS Units 60 through 80 feature two-stage firing with proved low fire start. Fuel and air supply are regulated at both high and low firing rate by a two-position motor controlled by a boiler mounted pressure or temperature operating control. Units 100 through 150 feature full modulation with proved low fire start. Fuel and air supply are regulated throughout the firing range by a modulating motor controlled by a boiler mounted pressure or temperature modulating potentiometer. All units feature combination electronic flame safeguard and programmer to assure safe operation with pre-purge, post-purge, and proved ignition for both fuels. Enforced low fire start is provided by an interlock on the motor operator. EXCLUSIVE COMBUSTION HEAD Advanced design of burner firing head provides quiet stable combustion of gas or oil at all inputs. The radialjet gas burner provides smooth firing with excellent flame retention. The pilot flame from the gas-electric ignition assembly surrounds the oil spray and contacts the tip of each gas jet for smooth lighting with maxi mum safety. AIR-OIL UNIT The air-oil unit assembly includes air compressor and oil pump, motor, and all necessary accessories to pro vide the fine oil atomization required for clean, efficient oil firing. A thermostatically controlled electric oil heater maintains uniform oil temperature to compensate for varying viscosities of residual oils. The multilouvered opposed-blade air damper provides accurately measured air supply to match fuel supply for top oper ating efficiency at all firing rates. CONTROL CABINET The heavy-gauge steel, control cabinet is completely prewired and ready for connection to a source of power. Control cabinet components include Fireye flame safe guard system, and all necessary relays, switches and controls for full automatic operation. MODEL DESIGNATION CHART Construction Design Output Rating Fuel I LW Design Pressure) 1I 100 I_Pg 0~ 5 I Grade of Oil Low Pressure - L High Pressure - H Heating Medium_____ Water - W Steam - S Air Atomizing Burner Number of U.S. Com'l. Std. Grade Pressure Atomizing Burner - BLANK Oil Firing Unit Output All Grades of Oil - O Gross horsepower rating - designate Gas Firing Method of Rating All types of Gas - G Standard rating of 5 sq. ft. fireside per horsepower - BLANK Special Rating - Designate, such as "Ohio" EXAMPLE: LW-100-GO5 is standard low pressure hot water 100 horsepower generator equipped for combination gas and No. 5 oil firing. 3- - 28678 s- RATINGS Unit Number* Rating --horsepower................................................. -- MBh................................................... -- steam per hour - 212F............... -- steam (gross).............................. --steam (MCA net) --low pressure . . . . . .sq ft Firing Rate --oil, 140,000 btu ... . . . gph --oil, 150,000 btu........................... . . . . gph -gas ...................................................... Heating surface (ASME)........................... Furnace volume.............................. Safety valve capacity--low pressure--steam per hour, .lbs --high pressure--steam per hour .lbs DATA 60 60 2010 2070 8375 6240 18.0 16.7 2511 300 19.7 2010 70 70 2344 2415 9765 7280 21.0 19.5 2930 350 21.8 2344 28) 80 80 2680 2760 11160 8320 24.0 22.3 3348 400 28.7 2680 5250 100 Ohio 100 3348 3450 13950 _ 30.0 27.9 4185 358 28.7 3348 5555 100 100 3348 3450 13950 10400 30.0 27.9 4185 500 33.5 3348 5555 125 125 4185 4312 17438 13000 37.5 34.9 5231 625 41.8 4185 5500 150 150 5022 5175 20925 15600 45.0 41.9 6278 750 47.9 5022 6500 Unit Number * 60 70 80 100 Ohio 100 125 150 Insulation thickness.................. Minimum stack diameter............................................. Gas controls (standard UL) -- --Size............................................................ --Required inlet pressure.................. Motors --Forced draft blower.................. . . . . hp --Pressure atomizing oil pump . . . . . . . . hp -- Air Atomizing air-oil unit .... - - hp --Separate pump set (No. 6 oil)............ . . . . hp --Oil heater --No. 4, 5. 6 oil ............ . . watts Control Circuit voltage.............................................................. Fuel -Air Control................................................ Flange Safeguard --gas, light oil, gas-light oil..................... -- heavy oil, gas-heavy oil........................... Approximate drv weight-low pressure.................. . . . .lbs -high pressure .................. . . . .lbs i', i', 2 12 12 14 2 6', 3, 230-60-1 2 6', 1 208/240-60-3 2', 7 206/240-60-3 115-60-1 230-60-1 230-60-1 111 208/240-60-3 208/240-60-3 208/240-60-3 230-60-1 230-60-1 230-60-1 2000 2000 3000 115-60-1 115-60-1 115-60-1 Two-position Two-position Two-position FJ-2 FJ-2 FJ-2 FP-2 FP-2 6355 7555 5155 7555 -------- 7755-------- -------- 5555-------- 2222 14 14 16 16 2', 7 2 208/240-60-3 230-60-1 i', 208/240-60-3 2', 7 2 208/240-60-3 230-60-1 1 '> 208/240-60-3 2', 8 3 208/240-60-3 ''3 230-60-1 I'i 208/240-60-3 3 8 3 208/240-60-3 230-60-1 208/240-60-3 230-60-1 3000 115-60-1 Modulating FP-2 fp^5 6555 57TJ5 230-60-1 3000 115-60-1 Modulating FP-2 --------- 8555 ------- T5555 230-60-1 4000 115-60-1 Modulating FP-2 FP75 11100 --rcuuo-------- 230-60-1 4000 115-60-1 Modulating FP-2 FP-2 13000 15005 DIMENSIONS (Inches) Unit Number * A--Length overall.............................................. B--Width overall.............................................. C--Steam supply height --low pressure............................... --high pressure .................................. D--Vent height...................................................................... E--Water line height--low pressure........................................... -- high pressure ........................................ F--Safety valve height...................................................................... G--Steam supply location.......................................................... H--Return location--low pressure--steam or water............ J--Supply size--low pressure--steam or water..................... --high pressure water .... --high pressure steam .... K--Return size--low pressure--steam or water.................. L--Drain size ....................................................... M--Base width....................................................... N --Base length......................................................................... P--Base location ...................................................................... Q--Vent opening size.......................................................... R --Vent opening location .......................................................... S-- Required tube replacement length..................................... T--Return location--high pressure water.................................. U--Return size--high pressure water........................................ See complete unit designation chart on page 3. 60 132 57 69 68'", 68 54 56 70 54 10', 6 4 4 4 1', 42 105 22 12 7 80 40 '4 2-3" 70 80 146 57 69 68', 68 54 56 70 68 10 S 6 4 4 4 i 42 119 22 12 7 94 40 2-3' 4- - HI 68 75 74 ----------- tT^ 59 60 80 /, 51 10', 8 6 4 4 1 48 110 27 14 8 86 53 ' ---------- 100 Ohio HI 68 75 74'-, 74 59 60 80', 51 10', 8 6 4 4 1 48 no 27 14 8 86 53 \ 2-4' 100 165 68 75 74', 74 59 60 8012 74 10', 8 6 4 4 48 133 27 14 8 110 53 2-4" 125 150 165 74 81 80 80 63 64', 86 '2 65 14 8 6 4 4 1 54 138 22 16 9 108 53 ' 2-4' 18b 74 8J BCPT 80 63 64 86 88 14 8 6 4 r,4 ------------54 161 i 22 16 9 132 61 2-4" 28679 Kewanee Scotch Generator STANDARD EQUIPMENT ALL UNITS OPTIONAL EQUIPMENT 1. Three-pass ASME Code Boiler 2. Scotch Wet-Back Design 3. Full Length Skid Type Bast 4. Gas-Tight Construction 5. Pyrex Observation Ports (Front & Rear) 6. 2" Firetubes 7. 16 Diameter Rear- Access Opening 8. Top Vent (Round! S. Metal Jacket with Mineral Fiber Insulation 10. Lifting Loops 11. Explosion Relief Door 12. Forced Draft Operation 13. Operating Limit Control 14. Safety High Limit Control 15. High-Low-Off Firing Sequence (Units 60 thru 80) Modulating Firing Sequence (Units 100 thru 150) 16. Motor Operator to Control Air and Fuel Supply Two-Position (Units 60 thru 80) -- Modulating (Units 100 thru 150) 17. Control for Motor Operation (Boiler-Mounted) Two-Position (Units 60 thru 80) -- Modulating (Units 100 thru 150) 18 Low Fire Start 19 Air-Flow Safety Switch 20. Flame Detector (Lead Sulphide) 21. Gas-Elecjric Ignition Assembly 22. Control Cabinet including: Electronic Flame Safeguard and Programming Cuntrol; Control Circuit Fuse: Control Circuit Switch. Burner Switch, Indicating Lights (2); Numbered Terminal Strip; Engraved Name Plates, and Necessary Relays and Magnetic Starters 23. Blower Motor Horsepower and Voltage: 3/4 HP. 230 v, 60 cy., 1 ph. (Unit 60) 1 HP, 208/220/240 v, 60 cy., 3 ph. (Unit 70) 1-1/2 HP, 208/220/240 v, 60 cy., 3 ph. (Unit 80) 2 HP, 208/220/240 v, 60 cy., 3 ph. (Units 100-Ohio & 100) 3 HP, 208/220/240 v, 60 cy., 3 ph. (Units 125 & 150) 24. Control Voltage - 115 v, 60 cy., 1 ph. Includes Reduced Voltage Transformer where required 25. Listed Standard and Selected Optional Equipment Mounted, Piped, Wired, Ready for Field Connection to Fuel, Water, Steam, and Electricity 26. Factory Fire-Test 27. Starting Service 28. Manhole (Units 80 thru 150) ! . Hu* Gas D mp saL.:* 2. 0:rn r Turn St . ui.-'d \ !: . . 3. Circuit B: - ak. : ,s. 4. Alarm Bell 5. DC Vultmctei 6. Modjiat.ni. Fi: in- beai-nm- fUmts 00t,,r.: Kn 8. Instantaneous u: Tank T\pt Ouis iLa'i Pnbii.iv Imts in Fiur.t Head 9. One-Year Semite Period STEAM UNITS 1. No. 157 Combination Water Column, Low Water Cut-Off, and Pump Control (No. 42K on Low Pressure Units 60 and 70) 2. Safety Valve(s) 3. Steam Gauge 4. Water Glass and Gauge5. Injector (High Pressure Units 125 & 150) 6. Blow-Off Valves (High Pressure Units) 7. Drain Valve (Low Pressure Units) 1. No. 193 Combination Water Column. Low Water Cut-Off. Pump Control & Alarm Switch 2 Combination Low Water Cut-Off, Water Feeder and Alarm Swi'rh i LowPressure Units) 3 Second Low Water Cut-Off 4. Surface Blow-Off 5. Higher Than Standard Working Pressure 1. No. 63B Low Water Cut-Off 2. Relief Valve(s) 3. Pressure Gauge 4. Thermometer HOT WATER UNITS 1. Combination Low Water Cut-Off. Water Feeder, and Alarm Switch 2. Second Low Water Cut-Off 3 Higher Than Standard Working Pressure PRESSURE ATOMIZING OIL UNITS 1. High Pressure Atomizing Oil Burner for No 2 or Lighter Oil 2. Two-Stage Oil Pump Assembly with Relief Valve and Gauge 3. Oil Pump Motor Horsepower & Voltage 1/4 HP, 115/230 v, 60 cv., 1 ph. (Units 60 thru 80) 1/3 HP, 115/230 v, 60 cy., 1 ph. (Units 100 thru 150) 4 Oil Atomizing Nozzles -- Single Nozzle (Units 60 thru 80) Variable Flow Nozzle (Units 100 thru 150) Oil Solenoid Valves -- Dual Valves (Units 60 thru 80) -- Single Valve (Units 100 thru 1 50; 6 Oil Metering Valve (Units 100 thru 150) Oil Relief Valve (Units 60 thru 80) Firevc Flame Safeguard System -- FJ-2 (Units 60 thru 80) - FP-2 (Units 100 thru 150) 8. Oil Filter (Not Mounted) 1. Direct Spark Electric Ignition 2. Oil Controls for FM 3. Oil Controls for FTA *4. Oil Controls for Local Code Requirements 5. Fireye FP-2 (Units 60 thru 80) _ AIR ATOMIZING OIL UNITS 1. Low Pressure Air Atomizing Oil Burner for No. 6 or Lighter Oil 2. Atr-Oil Unit Consisting of: Air Compressor, Air Pressure Regulating Valve, Motor, Inlet Air Filter, Check Valve, Air Prowng Safety Switch, Air Purge Relay, Air Gauge, Oil Pump Assembly with Gauge and Internal Relief Valve. 3. Air-Oil Unit Motor Horsepower & Voltage 1 HP. 208/220/240 v, 60 cv., 3 ph. (Units 60 thru 80) 1-1/2 HP. 208/220/240 v, 60 cy.. 3 ph. (Units 100 thru 150) 4. Thermostatically Controlled Electric Oil Heater: 2000 Watts (Units 60 thru 70} - 3000 Watts (Units 80 thru 100) - 4000 Watts (Units 125 & 150) 5. Air-Oil Nozzle 6. Oil Solenoid Valve 7. Oil Metering Valve 8 Straight Tube Boiler Mounted Oil Heater for No. 6 Oil. Below-Water- hne Heater with Pump Control (Low Pressure Steam and Water) Steam Heater with Steam Pressure Regulating Valve, Modulating Valve and Trap (High Pressure Steam) 9 Remote Oil Pump Set with Push Button Starter (No. 6 oil units) 10. Fireve FP-2 Flame Safeguard System 11 Oil Strainer (Not Mounted) 1. Oil Controls for FM 2 Oil Controls for FIA 3. Oil Controls for Local Code Requirements 4. Omit Electric Heater for No. 2 Oil 5. Safety Type Boiler Mounted Oil Heater for No. 6 Oil GAS Forced Draft Radial-Jet Flame Retention Type Gas Burner UL Gas Control Group including: Automatic Motorized Gas V5he, Automatic Safety Gas Valve. Gas Pressure Regulator. Gas. Volume Con trol Vnhe, Gas Pressure Gauge, and Gas Ok k Fireve Flame Safeguard System -- FJ-2 (Units 60 thru 80) - FP-2 (Units 100 thru 150) UNITS 1. Gas Controls for Other Than Standard Pressures 2. Gas Controls for FM 3. Gas Controls for FIA '4. Gas Controls for Local Utility Requirements 5. Fireye FP-2 (Units 60 thru 80) 1. Manual Fuel Change-Over Switch Special Application Only COMBINATION GAS-OIL UNITS *1. Automatic Fuel Change-Over Switch 5- - 28680 Kewahee Scotch Generator TYPICAL SCOTCH GENERATOR SPECIFICATIONS The contractor shall furnish and install . . . Model No............. Kewanee Scotch Generator(s) for (No. (2)(4J(5)(6) oil), (gas;, or (comonutiun ga.7, No. (2)(4){5)(6) oil) firing. The unit(s) shall be of three-pass wetback scotch design with two passes of firetubes, and constructed in accordance with the ASME Code for (15 lbs. steam) (30 lbs. water) (150 lbs. steam). The unit(s) shall contain not less than . . . cubic feet of furnace volume and shall have a gross output rating of not less than . . . (MBh) (Bhp). Heat release shall not exceed 135,000 Btu per cubic foot of furnace volume. Not mul water line of the unit(s) shall not exceed A refractorv lined access opening with pyrex observation port shall be provided to permit entrv into the rear combustion chamber. Unit shall be of gas tight construction throughout. Flue doors shall be gasketed and lined with insulating refractorv. Unitfs) shall be provided with lifting loops and factorv installed aluminum enameled steel jacket with glass or mineral fiber insulation. All tubes shall be set with a roller expander at each end. No welding of tubes to the tube sheets nor use of refractory baffling to provide the second or third pass will be permitted. Unitfs) shall be assembled and wired, with burner, controls, trim, and skid tvpe base installed at the factory. Fuel burning equipment shall be forced draft type* Factorv assembled, wired, mounted, and tested. The entire unit shall bear the Underwriters' Laboratories label and shall be readv for field connection to power and fuel supply. Equipment shall include forced draft fan with air damper; dual high limit controls; motor operator control; flame sensing device; and control cabinet containing Fireve (FP-2) (FJ-2) electronic flame safeguard and programmer, control circuit switch, necessary switching relavs, two indicating lights for major operations, numbered terminal strip, color-coded wiring and engraved nameplates. All motors shall be for . . . volts. . . . cycle. . . . phase operation. Controls shall be 115 volt, 60 cycle, single phase. Magnetic motor starters with thermal over-load protection and a step-down control circuit trans former shall be provided in the control cabinet when other than 115 \ oil motors are specified. Fuel burning equipment shall be set and adjusted bv a factorv-authorized representative to burn . . . G.P.H. of No. (2)(4)(5)(6) oil (and) (or) . . . C.F.H. of . . . Btu `cu. ft. (natural) (manufactured) (L.P.) gas having a . . . sp. gr. with . . . inches W.C. pressure at inlet of burner manual gas cock. Unit efficiency, based on flue gas analysis, shall be not less than 8CV?. Si>Tl : .s/u'eify tab altitude n oic i d, 500 ft aborc sea lercl. Owner's representative shall be present to receive instructions in care and maintenance of the unit at the time it is started up by the service representative. Contractor shall provide a free service period of 90 days after startup. A OF/.' Select applicable paragraphs below according to fuel and unit size The fallowing equipment conforms to VI. requirements. Specify additional controls if FM or FIA injured, or subject to special local utility requirements, FOR GAS UNITS Gas burner shall be of the radial-jet flame retention tvpe including a main gas control group consisting of an automatic motorized gas valve, automatic safety gas valve, gas volume control valve, gas pressure regu lator. gas gauge, and gas cock; gas-electric ignition assembly consisting of a pilot burner. 6000 volt ignition transformer, automatic gas valve, gas pressure regulator, and gas cock: air flow safet\ switch; lead sulphide flame detector: low fire interlock; and all necessarv controls and linkage for (modulated) (two-position) firing with proved low fire start. Fuel-air control shall provide (modulated) (two-position) regulation of the air damper and the gas volume control valve bv means of a motor operator. FOR PRESSURE ATOMIZING Oil UNITS Oil burner shall be of the pressure atomizing type for No. 2 oil with a twostage oil pump assembly with internal relief valve mounted on the boiler skid. Burner shall include oil atomizing nozzle: oil solenoid valve(s). oil control valve, gas-electric ignition assembly with pilot burner. 6000 volt ignition transformer, automatic gas valve, gas pressure regulator and gas cock; air flow safety switch; lead sulphide flame detector, low fire interlock; and all necessary controls and linkage for (modulated) (two-position) firing with proved low fire start. Fuel-air control shall provide (modulated) (twoposition) regulation of the air damper and the oil control valve by means of a motor operator. FOR AIR ATOMIZING OIL UNITS Oil burner shall be of the air atomizing tvpe f^r No. 15)( 6> or tighter oil with an air-oil unit consisting of air compressor, air pressure regulating valve. motor, mlet air filter. cheek valve, air provms safety switch air gauge. ral pump assembly and re lief '.ah'- mounted on t:ie boiler skid Burner shall include air-oil atomizing nozzle, oil solenoid \ alve, oil metering valve, air purge relay and valve, thermostatically controlled electric oil heater (om/t tor Xu doth: gas-eketru ignition assembly consisting of a pilot burnt r. bOOO volt ignition transformer, automatic gas v.il.e, gas pres sure regulator and gas cock; air flow safety switch, lead sulphide flame de tector: low fire interlock: and all necessarv controls and linkages for (modulated; (twn-position' firing with proved low fire start. Fuel-air control shall provide (modulated) (two-position) regulation of the air damper and the oil control valve bv means of a motor operator. [Oil burning equipment for Nv 6 oil shall include factorv mounted and piped istr.tight tub-, oil p t eh-.-ate- r'1 isafrtv tvpe i'll preheater) complete wnn ncitssurv temperature control lor (below-water line water operationi isteam operation1. A control shall be provided to permit continuous operation of separate oil pump and oil preheaters when burner is not running.) Sole specify oil tank heating system to hi a.-cci FOR COMBINATION GAS-PRESSURE ATOMIZING OIL UNITS Gas-oil burner shall consist of a combination radial-jet flame retention type gas burner and pressure atomizing oil burner for No. 2 oil including all necessarv controls for (modulated) (two-positionl tvpe of operation with proved low fire start. Gas controls shall include a main gas control group consisting of an automatic motorized gas valve, an automatic safetv gas valve, gas volume control valve, gas pressure regulator, gas gauge, and gas cock. Oil controls shall include a two-stage oil pump assemblv with internal relief valve; oil atomizing nozzle: oil solenoid valveis). oil control valve. Controls for both fuels shall include a lead sulphide flame detector, air flow safety switch; low fire interlock, and eus-electric ignition assemblv consisting of a pilot burner. 0000 volt ignition translormer, automatic gas valve, gas pressure regulator and gas cock. Fuel-air control shall provide (modulated) (two-position) regulation of the air damper, the gas volume control valve and the oil control valve bv means of a motor operator. Changeover from one fuel to the other shall be accomplished bv means of a manual fuel selector switch m the conti ol cabinet. No changes in linkage, burner position, or mechanical adjustment shall be necessarv when changing fuels. The fuel selector switch shall provide, through the com bustion control relay, proper ignition timing for the fuel being burned. FOR COMBINATION GAS-AIR ATOMIZING OIL UNITS Gas-oil burner shall consist of a combination radial-jet flame retention type gas burner and air atomizing oil burner for No. (5) (6) or lighter oil with all necessary controls for (modulated) (two-position) tvpe of operation with proved low fire start. Gas controls shall include a main gas control group consisting of an automatic motorized gas valve, automatic safetv gas valve, gas volume control valve, gas pressure regulator, gas gauge and gas coc-k. Oil controls shall include an air-oil unit consisting of an air compressor, air pressure regulating valve, motor, inlet air filter, check valve, air proving safetv switch, air gauge, oil pump assemblv and relief valve; air-oil atomizing nozzle, oil solenoid valve, oil metering valve, air purge relay and valve: thermostatically controlled electric oil heater (omit tor Xo doit). [ Oi 1 burning equipment for No. 6 oil shall include factorv mounted and piped (straight tube oil preheater) (safety tvpe oil preheater' complete with necessarv temperature control for (below-water line water operation) (steam operation). A control shall be provided to permit continu ous operation of separate oil pump and oil preheaters when burner is not running ] Sole SpecV\ oil tank heating s\stern to be user! Controls for both fuels shall include lead sulphide flame detector, air flow safety switchlow fire interlock: and gas-electric ignition assemblv <onsisfing of a pilot burner. 6000 volt ignition transformer, automatic gas valve. eas pressureregulator and gas cock. Fuel-air control shall provide (modulated1 (twoposiuon) regulation of the air damper, the gas volume control valve, and the oil metering valve bv means of a motor operator. Changeover from one fuel to the other shall be accomplished bv means of a manual fuel ."elector switch m the control cabinet. No changes in linkage, burner position, or mechanical adjustment shall be necessarv when changing fuels. The fuel se lector switch shall provide, through the combustion control relnv. proper ignition timing for the fuel being burned. 28681 -6 Copvnq-* !96?, 'tonio'O' & SfanOO'e Son.lcrj CorcCKO'o-