MODEL STX Packaged Semi-Instantaneous Steam Fired Water Heater Shell and Tube Style Heater Features Reliable Only high grade materials used in construction to ensure long operating life Heat exchange pressure vessel constructed from 316L Stainless Steel for long service life Heavy duty construction withstands demanding commercial/industrial use Packaged System Factory selected and sized steam control valve simplifies installation and ensures reliable operation All steam operating controls are factory sized and selected to ensure reliable operation Versatile Full range of styles, sizes, and optional features to meet your exact heating needs Applications Schools Office Buildings Sports Complexes Hotels Industrial Facilities Nursing Homes Hospitals Model STX Semi-Instantaneous Type The Model STX is equipped with all operating controls and ready for immediate installation ASME U A Heavy Steam Fired Semi-Instantaneous Water Heater Whether you are heating potable water in a commercial The Model STX is a fully packaged semi-instantaneous building or process water in an industrial application, steam fired water heater which utilizes steam for you can select a Hubbell STX model to do the job. heating potable water. The entire package is designed When you specify and install a Hubbell water heater, to be a reliable and long lasting source for hot water. you will be provided with a quality product that is a long Each component is carefully selected to ensure high performance in even the most demanding application. lasting and trouble free source for hot water. A Packaged Water Heater Ready For Installation
Model STX Semi Instantaneous Standard Equipment Vessel Construction 1. Solid 316L Stainless Steel vessel designed and built in strict accordance with the ASME Code Section VIII and stamped, certified, and registered with the National Board of Boiler and Pressure Vessel Inspectors 2. Designed for 150 psi working pressure and hydrostatically tested Steam Water Operating Controls 1. Steam operating controls are factory selected, sized, piped and tested to ensure reliable operation 2. All steam components are factory plumbed with schedule 40 black iron pipe and ready for steam and condensate connections 3. High quality cast iron pilot operated steam control valve modulates the flow of steam through the heating coil to provide accurate water temperature control 4. Cast iron Y strainer with 20 Mesh screen protects the steam controls and coil from dirt and debris in the steam supply 5. Thermostatic drip trap removes condensate from the steam supply line 6. Heavy duty cast iron float and thermostatic main condensate trap for optimum efficiency 7. All bronze integral circulating pump 8. Panel mounted steam and domestic water temperature and pressure gauges 9. High limit Single solenoid safety system closes the steam supply to the heating coil should the water temperature in the tank reach the hi-limit set point. Requires 120 volt 5 amp electrical service Heating Coil 1. Factory sized and installed copper heating coil with a generously sized heating surface designed to ensure reliable operation 2. U-Tube heating coil constructed from single wall copper tubing designed for a maximum working pressure of 150 psi 3. Heavy duty fabricated steel head with threaded NPT inlet and outlet connections 4. All wetted parts are non-ferrous for maximum longevity 5. Non-Ferrous tube sheet General 1. Heavy duty fiberglass insulation compliant with ASHRAE 90.1 for maximum operating efficiency and minimal stand-by heat loss 2. Heavy gauge painted galvanized steel protective outer jacket 3. Heavy duty integrally welded steel supports and base for floor mounting 4. Full five (5) year Non Pro-Rated pressure vessel and a one (1) year component warranty 5. ASME rated combination T&P relief valve set at the tank working pressure and 210 o F Vessel 1. Alternate vessel construction: Solid 90/10 CuNi 2. Alternate working pressure: Please specify Heating Coil 3. Double wall tubing with a leak detection port 4. Alternate tubing material please specify: (Stainless Steel, 90/10 Copper-Nickel, Admiralty) 5. Fabricated head constructed from: (Stainless Steel, Copper Alloy) Optional Equipment NOTE: Other optional features are available, please consult factory if required. General 6. Type 304 stainless steel protective outer jacket, please specify if painted 7. Condensate orifice trap in lieu of float and thermostatic steam trap for sub cooling. Operating Controls 8. A double solenoid safety system dumps over heated water in the vessel to drain in addition to closing the steam supply to the heating coil. Requires 120 volt 5 amp electrical service 9. Electric or Pneumatic operated steam control valve 10. Electric Control package for integration with Energy Management Software (EMS) and Building Automation Software (BAS). MODBUS communication to monitor the heater via RS-232 or RS-485 Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory. 2
Model STX Vertical Dimensions (inches) Model No. Based on 100 o F T Recovery Rate (40-140 F) Base Model Recovery Rating (GPH) 40-140 F BTU/Hr STXSS600 600 500,000 STXSS900 900 750,000 STXSS1200 1200 1,000,000 STXSS1500 1500 1,250,000 STXSS1800 1800 1,500,000 STXSS2400 2400 2,000,000 STXSS3000 3000 2,500,000 STXSS3600 3600 3,000,000 STXSS4200 4200 3,500,000 STXSS4800 4800 4,000,000 STXSS6000 6000 5,000,000 STXSS7500 7500 6,250,000 STXSS9000 9000 7,500,000 STXSS10500 10,500 8,750,000 Steam Supply Pressure (psi) Vertical Model STX Overall Dimensions (inches) Single Wall Double Wall A B C D E A B C D E Weight (Lbs) 5 99 46 35 12 18 100 46 35 13 19 610 15 87 40 29 12 18 100 46 35 13 19 585 25 87 40 29 12 18 88 40 29 13 19 585 50 87 40 29 12 18 88 40 29 13 19 585 75 99 46 36 11 17 88 40 29 13 19 560 5 88 40 29 13 19 88 41 28 15 21 655 15 99 46 35 12 18 100 46 35 13 19 610 25 99 46 35 12 18 100 46 35 13 19 610 50 87 40 29 12 18 88 40 29 13 19 585 75 87 40 29 12 18 88 40 29 13 19 585 5 88 40 29 13 19 88 41 28 15 21 655 15 76 34 23 13 19 88 41 28 15 21 615 25 76 34 23 13 19 100 46 35 13 19 615 50 87 40 29 13 18 100 46 35 13 19 585 75 87 40 29 13 18 88 40 29 13 19 585 5 76 35 22 15 21 100 47 34 15 21 770 15 88 40 29 13 19 88 41 28 15 21 655 25 76 34 23 13 19 88 41 28 15 21 615 50 99 46 35 12 18 100 46 35 13 19 610 75 87 40 29 12 18 100 46 35 13 19 585 5 76 35 22 15 21 89 41 28 17 23 770 15 76 35 22 15 21 88 41 28 15 21 770 25 88 40 29 13 19 88 41 28 15 21 655 50 76 34 23 13 19 88 41 28 15 21 615 75 99 46 35 12 18 100 46 35 13 19 610 5 77 35 22 17 23 89 41 28 17 23 985 15 76 35 22 15 21 100 47 34 15 21 770 25 76 35 22 15 21 88 41 28 15 21 770 50 88 40 29 13 19 88 41 28 15 21 655 75 88 40 29 13 19 88 41 28 15 21 655 5 77 35 22 17 23 78 36 21 19 25 985 15 76 35 22 15 21 89 41 28 17 23 770 25 76 35 22 15 21 89 41 28 17 23 770 50 76 35 22 15 21 88 41 28 15 21 770 75 88 40 29 13 19 88 41 28 15 21 655 5 77 35 22 17 23 90 42 27 19 25 985 15 77 35 22 17 23 89 41 28 17 23 985 25 76 35 22 15 21 89 41 28 17 23 770 50 76 35 22 15 21 100 47 34 15 21 770 75 76 35 22 15 21 88 41 28 15 21 770 5 78 36 21 19 25 90 42 27 19 25 1130 15 77 35 22 17 23 78 36 21 19 25 985 25 77 35 22 17 23 89 41 28 17 23 985 50 76 35 22 15 21 89 41 28 17 23 770 75 76 35 22 15 21 100 47 34 15 21 770 5 78 36 21 19 25 96 43 33 20 27 1130 15 77 35 22 17 23 90 42 27 19 25 985 25 77 35 22 17 23 78 36 21 19 25 985 50 76 35 22 15 21 89 41 28 17 23 770 75 76 35 22 15 21 100 47 34 15 21 770 5 84 37 27 20 27 87 38 27 22 31 1480 15 78 36 21 19 25 90 42 27 19 25 1130 25 77 35 22 17 23 78 36 21 19 25 985 50 77 35 22 17 23 89 41 28 17 23 985 75 76 35 22 15 21 89 41 28 17 23 770 5 87 38 27 22 31 1610 15 78 36 21 19 25 87 38 27 22 31 1130 25 78 36 21 19 25 84 37 27 20 27 1130 50 77 35 22 17 23 90 42 27 19 25 985 75 77 35 22 17 23 89 41 28 17 23 985 5 15 84 37 27 20 27 99 44 33 22 31 1480 25 78 36 21 19 25 99 44 33 22 31 1130 50 78 36 21 19 25 90 42 27 19 25 1130 75 77 35 22 17 23 90 42 27 19 25 985 5 15 87 38 27 22 31 1610 25 84 37 27 20 27 99 44 33 22 31 1480 50 78 36 21 19 25 96 43 33 20 27 1130 75 77 35 22 17 23 90 42 27 19 25 985 Note: All dimensions are approximate and subject to change. Please reference the submittal drawing for actual dimensions. Please consult factory for recovery ratings for steam pressures not shown. 3
Vertical Semi-Instantaneous Steam Fired Outline Dimensions - Model STX (Vertical) T&P Relief Valve D Hot Water Outlet Protective Jacket A Thermometer Hi-Limit Thermostat Pump Switch Recirculation Pump Pressure Gauge Cold Water Inlet Temperature Controller Hi-Limit Solenoid Valve Insulation Drain Control Valve Steam Inlet Inlet Strainer B Trap Strainer C Main Trap Drip Trap Condensate Outlet E Horizontal Semi-Instantaneous Steam Fired Product Overview - Model STXH (Horizontal) Note: Please contact factory for horizontal dimensions Temperature Controller Hi-Limit Thermostat Control Valve T&P Relief Valve Hot Water Outlet Pump Switch Drain Withdrawal Space Pressure Gauge Hi-Limit Solenoid Valve Insulation Thermometer Protective Jacket Cold Water Inlet Recirculation Pump TOP VIEW END VIEW 4
Redundant System Skid Package Option 5
Model Number Designation STX Model Number Designation SS Step 1 Model: STX = Vertical STXH = Horizontal Step 2 Vessel Type: SS = 316L Stainless Steel CN = Copper-Nickel Step 3 Recovery Rating: In GPH at 100 o F T Step 4 Coil Type: S = Single Wall D = Double Wall Example: STXSS-3600S A vertically installed semi-instantaneous steam fired water heater with a 316L Stainless Steel pressure vessel and single wall heating coil rated to heat 3600 GPH at a 100 o F temperature rise. Option Note Any and all optional equipment for a water heater must be called out in the written specifications. A model number in and of itself does not reflect any optional equipment selected. Steam Consumption Formula GPH x Latent Heat of Steam o F T x 8.33 = Lbs / Hr Steam Steam Pressure (psi) 0 2 5 10 15 20 25 30 40 50 Latent Heat 970 966 960 953 946 939 933 929 920 912 Metric Conversions Liters x 0.2641 = Gallons Gallons x 3.79 = Liters Gallons x 0.003785 = m 3 m 3 x 264.2 = Gallons 1 o C T = 1.8 o F T o F = ( o C x 1.8) + 32 o C = ( o F - 32) x 0.556 psi x 0.06896 = Bar Bar x 14.5 = psi psi x 6.86 = kpa kpa x 0.1456 = psi Lbs x 0.4536 = Kg Kg x 2.2 = Lbs ft 2 x 0.0929 = m 2 m 2 x 10.765 = ft 2 6
Piping Layouts SINGLE UNIT Steam Supply Hot Water Out Recirculation Cold Water In Condensate Return Drain Hot Water Out DUAL UNIT Steam Supply Condensate Return Recirculation Drain Drain Cold Water In 7
Piping Layouts SINGLE UNIT WITH STORAGE TANK Steam Supply Hot Water Supply Recirculation Cold Water In Storage Tank Hot Water Out Condensate Return Drain Hot Water Return LEGEND Strainer Stop Valve Check Valve Control Valve Relief V alve Thermal Element Pressure Gauge Temperature Gauge Steam Trap Circulator Expansion Tank 8
Master Specification: Model STX Job Name engineer Representative contractor GENERAL Provide a quantity of semi instantaneous steam fired water heater(s), Model No. as manufactured by HUBBELL Electric Heater Co., Stratford, CT. The pressure vessel shall be mounted on heavy duty steel structural supports and be suitably insulated, jacketed, painted and provided with lifting lugs. The entire unit is to be packaged ready for service connections. PRESSURE VESSEL The shell section shall be constructed from 316L stainless steel. ( Optional Specification: 90/10 copper-nickel). Vessel shall be stamped for 150 psi under Section VIII of the ASME Code ( Optional Specification: psi). Manufacturer s data report and U-1 forms shall be furnished to the owner. No overhead clearance shall be required for servicing or removing the heating coil. Each heater shall be designed to heat GPH of domestic water from to o F when supplied with psi of steam. HEATING COIL The heating coil shall be fabricated with single wall ( Optional Specification: Double wall) copper, ( Optional Specification: Stainless steel, 90/10 copper-nickel, admiralty) tubes, non-ferrous baffles and stainless steel tube sheet. The heater shall have its temperature control bulb located for direct sensing of water. CONTROLS The water heater steam and operating controls shall be factory assembled and piped. A modulating steam control valve shall be (Specify: Pneumatic, electric, self contained). Solenoid control valves that regulate the flow of steam to the heating coil shall not be accepted. Each heater shall be factory packaged with the following components: All bronze integral circulating pump with copper piping and isolation valves Panel mounted steam pressure and water temperature gauges High limit safety system ASME rated temperature and pressure relief valve Fiberglass insulation with painted metal jacket Cast iron strainers and F&T traps OPTIONS In addition, the water heater shall be supplied with the following optional features: Option Option Option WARRANTY The water heater manufacturer shall warranty all components against defects in Workmanship and material for a period of one (1) year from date of start-up and the pressure vessel for a full five (5) years Non Pro-Rated ( Optional Specification: full ten (10) years Non Pro-Rated) from date of start-up, provided that the unit is started within three (3) months of date of shipment and installed and operated within the scope of the tank design and operating capability. Each water heater shall be shipped with a complete set of installation and operating instructions including a spare parts list and approved drawing. ISO 9001:2008 ISO Committed to continuous improvement... Continuing research results in product improvement; therefore specifications are subject to change without notice. For the most updated information, consult the factory directly. Made in the U.S.A. The Electric Heater Company P.O. Box 288 Stratford, CT 06615-0288 Phone: 203-378-2659 Fax: 203-378-3593 info@hubbellheaters.com www.hubbellheaters.com [Rev B]