Hubbell ST User's Manual
Contents
1. 3 BOLT SIZE STEP 1 STEP 2 FINAL 5 8 60 96 120 3 4 100 160 200 7 8 160 256 320 245 592 490 1 1 8 355 568 710 1 1 4 500 800 1 3 8 680 1088 1 2 20 BOLTS 24 BOLTS 32 BOLTS Convection packages may be equipped with an integral circulator This circulator should be serviced per the enclosed pump O amp M manual The unit as well as all strainers should be blown down regularly to remove any trash and sediment that may have accumulated If unit is supplied with anode rod it shall be inspected for excessive wear Packing on valves and regulators should be checked for leaks and repaired or replaced as necessary To seal the manhole gasket first install the cover crab new gasket bolt and nut Turn the nut until it is snug against the crab then turn 1 revolutions Fill the tank with water and allow pressure to build up letting the water pressure seal the gasket Some leakage may 19 20 16 17 occur at this point but as the gasket seats leaking will gradually stop After leaking has stopped turn the nut approximately 1 revolution At this point there may be some miner seepage wait a few minutes to see if this seepage stops If seepage continues drain the tank inspect the manhole ring and cover for any damage repair or replace as required Repeat the above procedure using a new gasket Never try to seal the cover solely by turning the nut down tight this may cut or crush the2. Turn the spring adjustment screw slowly to increase spring tension until the pressure on the down stream side of the valve has dropped to 0 and there is no sound of flow through the valve Do not turn spring adjustment past this point If the valve will not open with air on the diaphragm spring is adjusted too tightly 1 Release all air pressure from the valve diaphragm 2 Apply steam pressure to the valve 3 Loosen tension on the spring until steam begins to seep through the valve 4 Slowly tighten spring tension until flow stops 5 Do not turn spring adjustment past this point 4 ADJUSTMENT OF 3 WAY AIR OR WATER OPERATED VALVES a Turn thermostat down so that no air pressure is on the valve diaphragm If unit continues to heat valve spring tension needs to be increased b Shut off heating medium c Disconnect stem coupling A d Lift lower stem and hold against upper valve seat e Turn adjustment screw C until there is approximately a 1 16 inch gap between the two stem halves 25 f Apply air pressure to valve diaphragm so that stem halves are aligned and re connect stem halves If valve will not open with air on the diaphragm spring tension should be decreased h Adjustment is essentially the same as if spring tension were increased except the adjustment screw is turned in the opposite direction Valve Diaphragm Lower Valve Seat 5 ADJUSTMENT OF PILOT OPERATED VALVES a
3. Clean tubes per Section annual scheduled maintenance Excess silt in bottom of tank Drain and flush tank per Section III annual scheduled maintenance Air or water leak in temperature control Repair or replace per separate O amp M Ruptured diaphragm on air or water operated valve Repair or replace per separate O amp M Debris in Accritem Clean Accritem Strainers clogged Clean strainers per Section III annual scheduled maintenance Pump impellor deteriorated Repair or replace per separate O amp M Overheating Temperature regulator has Repair or replace per separate O amp M lost its charge self contained valves only Ruptured tube s in heating Remove replace heating coil coil Temperature regulator needs Adjust temperature regulator per adjusting Section IV Circulator not operating Repair or replace per separate O amp M Debris under seat of Repair or replace per separate O amp M temperature control valve Capillary tube pinched on Repair or replace per separate O amp M temperature control Immediate loss of heating Rib blown out of tube side Remove heating coil and replace capacity gasket gasket Capillary tube pinched on Repair or replace per separate O amp M temperature control Ruptured diaphragm on Repair or replace per separate O amp M temperature control valve Defective steam trap Repair or replace per separate O am
4. Pilot operated valves such as Spence or Spirax Sarco are not fail safe These valves have a liquid or gas filled thermo static bulb and if this bulb loses its charge the valve will go to its full open position and cause overheating of the water heater This situation should be considered before attempting to adjust these valves b Spirax Sarco Valves are completely pre set at the factory and there is no spring adjustment Set the thermostat at the desired temperature and no further adjustment is required 26 c Spence Valves There is main spring adjustment on Spence Valves To set temperature on the water heater 1 Turn pilot spring adjustment clockwise until all tension is off the spring 2 Refer to unit start up section and start unit except for thermostat setting 3 Turn spring adjustment counter clockwise until the wheel is firmly against the spring 4 Continue to turn wheel A one 360 turn or until steam begins to pass thru the valve 5 Allow unit to heat until the valve closes off 6 If unit is not up to temperature at this point continue to turn adjustment wheel turn stop and allow valve to shut off 7 Repeat this cycle until unit is up to the desired temperature 21 SECTION V TROUBLESHOOTING See separate component O amp M for additional details Symptom Probable Cause Corrective Action Remedy Gradual loss of heating capacity Tubes are fouled
5. gasket and make sealing impossible Drain and flush tank as follows Perform annually or more often if required NOTE Cement lining is a durable lining that will provide many years of service protecting your steel pressure vessel from corrosion The process of cement lining includes an inspection to ensure that the lining is applied to the correct thickness covers all appropriate surfaces and is free from defects or cracks greater than 3 mm 1 8 in width Any deficiencies are repaired at the factory prior to shipment However it is characteristic to find hairline cracks in the cement lining prior to initial installation After the vessel is first filled the water will work its way into these cracks and begin the corrosion process At the same time the cement lining undergoes a wet curing process whereby the cement absorbs water and expands The water that is absorbed into the lining becomes trapped between the cement lining and the steel tank and once the cement is fully absorbed with water the water in contact with the steel tank becomes deoxygenated which serves to protect the steel vessel In addition the cement leaches minerals and various impurities from the water which fills and heals the cracks This healing together with the wet curing and expansion of the cement prevents any ongoing corrosion In the unlikely event a crack greater than 3 mm 1 8 develops the cement lining can be easily repaired in the field For re
6. 14 ST O PG PG LS O d x CW gt REC CN LEGEND S STRAINER RV RELIEF VALVE CW COLD WATER T STEAM TRAP PG PRESS GAUGE ST STEAM R TEMP REGULATOR TH THERMOMETER REC RECIRCULATION D DRAIN CV CHECK VALVE CN CONDENSATE HW HOT WATER Typical Piping Diagram ELECTRICAL INSTALLATION 1 Ifthe unit is furnished with a pilot or self contained control valve no external source of power is required for the valve See enclosed operation and maintenance manual for specific valves 2 If the unit is furnished with an air or electric control valve see enclosed drawings for required connections See enclosed operation and maintenance manuals for specific valves 3 Torque screws per torque chart included in Section VI 4 Allother electrical connections are made at the factory therefore no other electrical connections are necessary FILLING THE HEATER 1 Begin with all steam condensate and water valves closed 2 Open the isolation valves on the integral circulator line if supplied 3 Open cold water valve fill unit with cold water Lift lever on relief valve to relieve trapped air Release relief valve lever when all traces of air have been vented from the unit Leave cold water valve open STARTUP 1 Turn pump switch to the ON position if supplied Do not operate pump without unit being filled with water and isolation valves being opened as damage to the pump could result 2 Set control valve thermostat to app
7. 9 12 16 131 86 147 160 236 192 219 143 247 26 3 824 259 212 240 17 272 294 376 317 349 228 39 47 517 422 480 313 542 58 sa 45 502 328 565 613 682 558 462 43 73 74 5 81 1110 907 1030 715 160 130 2328 1905 2140 1495 2430 275 2318 1895 2130 1490 2420 255 18 3440 2815 3185 205 3595 4130 30 CONVERSIONS Liters x 0 2641 Gallons Gallons x 3 79 Liters Gallons x 0 003785 m m3 x 264 2 Gallons 1 C AT 1 8 F AT C x 1 8 32 C 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 x 0 0929 m m2 x 10 765 ft 31
8. OPERATING AND MAINTENANCE MANUAL FOR STEAM FIRED WATER HEATER BASE MODEL ST and STH HUBBELL ELECTRIC HEATER COMPANY P O BOX 288 STRATFORD CT 06615 PHONE 203 378 2659 FAX 203 378 3593 INTERNET http www hubbellheaters com IMPORTANT Always reference the full model number and serial number when calling the factory WARNING CAUTION Tank is to be completely filled with water and all air is to be vented before energizing Due to the rigors of transportation all connections should be checked for tightness before heater is placed in operation Safety relief valve must be installed in tapping provided KEEP AWAY FROM LIVE ELECTRICAL CIRCUITS Do not perform any maintenance make any adjustments or replace any components inside the control panel with the high voltage power supply turned on Under certain circumstances dangerous potentials may exist even when the power supply is off To avoid casualties always turn the power supply safety switch to off turn the charge or ground the circuit before performing any maintenance or adjustment procedure Generalized instructions and procedures cannot anticipate all situations For this reason only qualified installers should perform the installation A qualified installer is a person who has licensed training and a working knowledge of the applicable codes regulation tools equipment and methods
9. RGIZED AIR FLOW DO NOT PLUG 5 FENG 3 23 DOUBLE SAFETY SOLENOID SYSTEM if installed 115 VOLTS BY CONTRACTOR PENN AQUA STAT A 19 ABC II RANGE I00 F TO 200 F SPDT 5 q SHELL 3 2 CPLG 2 3 1 1 TO DRAIN 4 VALVE 8320178 T BY CONTRACTOR OPERATION CONTROL VALVE AIR FROM CONTROLLER 24 IN AN OVERHEAT SITUATION THE AQUA STAT CONTROLS THE TWO SOLENOID VALVES THE 3 WAY VALVE DIVERTS AIR FROM THE CONTROL VALVE CLOSING IT AND REMOVING THE HEATING MEDIUM AT THE SAME TIME IT OPENS THE 2 VALVE BLEEDING OFF ANY PRESSURE BUILD UP THAT MAY RESULT IN AN OVERHEAT SITUATION SECTION IV ADJUSTMENT OF TEMPERATURE REGULATORS 1 The spring tension on temperature regulators is adjusted at the factory to meet design conditions However design conditions may vary from actual operating conditions and re adjustment might be required on this job 2 Whenever possible Hubbell uses fail safe regulators This means that if the controlling medium such as air or water is lost the valve will close under it s own spring tension 3 ADJUSTMENT OF 2 WAY AIR OR WATER OPERATED VALVES a Release all air pressure from the diaphragm b Apply steam pressure to the valve c Ifatthis point there is pressure on the downstream side of the valve or if steam can be heard passing through the valve valve spring tension needs to be increased d
10. cessary To clean inside of tubes remove all heads and covers Caution Do not loosen heads until you are sure all pressure is off the equipment and the unit is drained In cleaning a tube bundle tubes should not be hammered on If it is necessary to use scrapers care should be taken to insure that the tubes are not damaged Before it is necessary to apply mechanical means for cleaning try to clean the unit using the following methods a Circulate hot fresh water at a reasonable velocity b Try spraying with water hose c Consult with manufacturers of cleaning compounds and chemicals They will check the nature of the deposit recommend the right cleaning compound and in many cases provide equipment and personnel for a complete cleaning job Do not clean tubes by blowing steam through individual tubes To tighten a loose tube joint use a suitable roller type tube expander Do not roll tubes that are not leaking If double wall tubes are supplied return to the factory for repairs If the unit is dismantled for any reason it should be reassembled using new gaskets Do not tighten bolts until gaskets are properly seated Exterior of unit should be cleaned and if necessary repainted When tightening bolts in the element head tighten the bolts in a criss cross pattern This will evenly distribute pressure around the flange and help prevent warping See diagram below 11 12 13 14 15 gt 3
11. d be sized to meet the design conditions as dictated by good engineering practices 2 Refer to the enclosed drawing for location of piping connection 13 3 Install the combination temperature and pressure safety relief valve in the tapping provided Note that this 15 required by law for safety considerations Outlet to floor drain BN Install into provided tapping Manual Release Lever Temperature Probe 4 Install a relief valve overflow pipe to a nearby floor drain CAUTION No valve of any type should be installed between the relief valve and tank or in the drain line HOOK UP OF AIR AND WATER OPERATED CONTROLS 1 Most air or water operated valves on Hubbell water heaters are controlled by Powers Accritem Occasionally a Robertshaw Fultrol is furnished which operates identically to the Powers control except supply and output connections are reversed in location Controls are normally mounted on the back side of the tank shell If setting does not agree with temperature of tank loosen set Screw amp set knob at actual tank temperature Re tighten set screw WATER UNITS ONLY PRESSURE REDUCER Sensitivity Adjust ment Normal Setting Air 1 8 turn from closed Water 1 2 turn from closed Never close completely WATER UNITS ONLY Air Supply Powers onl Air Supply 1 8 NPT entr Robertshaw Fultrol only 15 25 PSI 200 S C I M 1 4 NPT 18 20 PSI 12 CFH
12. m regulator steam drip trap condensate trap steam strainer condensate strainer vacuum breaker and an ASME rated combination temperature and pressure safety relief valve Optional equipment may be supplied with your unit Please consult the product drawing for details specific to your assembly The unit is factory assembled insulated jacketed primed painted piped tested and ready for service connections CONSTRUCTION TANK Standard Tank Construction The standard storage tank is constructed of all welded carbon steel designed and built in accordance with ASME Section VIII and stamped certified and registered with the National Board of Boiler and Pressure Vessel Inspectors It is internally lined with specially formulated Hydrastone cement to a 5 8 inch minimum thickness for superior protection and tank longevity Optional Tank Linings 1 Phenolic An epoxy coating applied in two coats to a total thickness of 10 12 mils Typically used in process applications using low conductivity deionized DI distilled or food grade water 2 Copper A 3lb sq ft copper sheet approximately 0 0646 inches thick covers all interior surfaces copper sheet seams are factory tested to ensure long lasting protection of the steel vessel 3 Flame Spray Copper Molten copper is sprayed on the interior surfaces to a thickness of 5 6 mils The copper bonds to the steel and an additional overcoat of Phenolic lining is applied on the co
13. n order to control the flow of steam through the valve No external power is required for operation 3 Pneumatically Operated In this configuration the building air supply feeds a factory installed temperature controller that operates the steam control valve The temperature controller sends a precise air signal to the steam control valve which adjusts the flow of steam into the heating coil The temperature controller is fully adjustable from 50 250 F and requires 20 psi air at a maximum consumption of 0 5 SCFM 4 Electronically Operated This control valve is similar to a pneumatically operated system except in this case the temperature controller is a sophisticated digital display electronic device which outputs a 4 20 ma signal to a compact motor mounted on the steam control valve in order to proportionally control the flow of steam to the heating coil The temperature controller displays set point as well as actual water temperature and is available with an RS485 communications port for remote control 11 OPTIONS The following optional features may be included in your water heater Reference the drawing specific to your heater for further details Single Solenoid Safety System A single solenoid safety system closes the steam supply to the control valve should the temperature in the tank reach the high limit set point This option requires 120 volt 5 amp electrical service Double Solenoid Safety System A double solenoid safet
14. necessary for safe installation of a steam fired water heater If questions regarding installation arise check with your local plumbing and electrical inspectors for proper procedures and codes If you cannot obtain the required information contact the company TABLE CONTENTS SECTION TITLE II GENERAL DESCRIPTION AND CONSTRUCTION INSTALLATION AND OPERATION SCHEDULED MAINTENANCE AND SERVICING ADJUSTMENT OF TEMPERATURE REGULATORS TROUBLESHOOTING MISCELLANEOUS CHARTS AND FORMULAS PAGE 13 18 25 28 30 OUTLINE DIMENSIONS MODEL ST VERTICAL Puer alvo Protective Jacket Pressure Vessel Insulation B Withdrawal Space Heating Coil Combination Cold Water Inlet And Drain gt gt Side View Front View MODEL STH HORIZONTAL E T amp P Relief Lifting Hot Water Valve Lugs Outlet Pressure Vessel Insulation Protective Jacket Manway Withdrawal 5 Drain Cold i i Water Inlet Sie VIN Heatin Coil p Supports Saddles Or Skids Front View OVERALL DIMENSIONS MODELS ST AND STH _ Overall Dimensions Inches Approx Shipping Tank Shell Element Neck Relief Valve Accritem Integral Circulator Mot
15. or Starter Gage Console Heating Element Shell Side Gasket NOMENCLATURE FOR PARTS J Tube Side Gasket K Element Head L Tube Sheet M Baffle N Tie Rod 0 Temperature Regulator P Main Strainer N Condensate Strainer R Drip Trap Main Trap Manhole Ring Manhole Gasket Manhole Cover Manhole Crab Manhole Bolt Manhole Nut Demand Sensor NOMENCLATURE FOR ACCESSORY PARTS Pilot Operated Valve Air Operated Valve A Valve Actuator B Valve Body A Thermostat Assembly B Pilot Assembly C Valve Body Self Contained Valve Companion Flange Pump Bodv F Thermal Overload A Valve Actuator Main Seal G Coupling B Valve Body H Impeller STEAM COMPONENT GENERAL CONFIGURATION The steam control valve maintains accurate water ice find buf temperature in a steam fired water heater by regulating in tank the flow of steam through the heating coil Adjustable Temperature Pilot Steam Inlet umatic or electronic Y Strainer controller if required Steam Pressure Gauge Vacuum Breaker MN ontro Valve Steam Coil Thermostatic Drip Trap Y Strainer Condensate Outlet F amp T Main Condensate Trap SECTION I GENERAL DESCRIPTION AND CONSTRUCTION GENERAL DESCRIPTION This book describes a packaged steam powered water heater that is a stationary self contained unit The complete assembly on a standard unit consists of the storage tank immersion heating coil stea
16. p M Blockage in condensate line Clean blockage from condensate line Loss of air pressure on temperature regulator Check air pressure to temperature regulator Verify that it is within limits Adjust as necessary 28 Excessive vibration High rate of flow beyond Consult factory design conditions Under sized piping to the Re pipe lines to unit using proper unit sized lines Water hammer Defective steam trap Repair or replace per separate O amp M Undersized condensate lines Re pipe condensate line using proper sized lines Insufficient slope on Increase slope on condensate lines condensate lines causing backup Red symptom indicates that equipment should be shut down immediately and cause of malfunction corrected before unit is re started or serious damage may result 29 SECTION VI MISCELLANEOUS CHARTS AND FORMULAS TORQUE VALUES SILICON ALUM 18 8 5 5 BRASS 316 S S MONEL BOLT SIZE BRONZE 7 IN LBS IN LBS ps 4 IN LBS IN LBS 66 54 61 36 69 67 77 63 71 42 81 78 1 94 77 87 51 98 96 96 79 89 53 98 121 99 112 66 127 123 198 162 184 108 207 202 220 180 204 20 230 224 4 228 186 212 138 258 259 752 615 688 456 788 853 940 770 870 570 990 1060 132 107 123 80 138 1
17. pair procedures please contact Hubbell Shut down unit as described in Section II Close valve on hot water outlet piping Open valve on drain piping Cold water inlet line pressure will be strong enough to flush sediment from the bottom of the tank out through the drain Let water run for 3 4 minutes Clean strainer filter see below Close drain valve Open hot water valve Restart unit as described in Section II Clean strainer filter Perform annually or more often if required a Remove blowoff bushing E or cap F as required mga b Remove gasket B if required c Remove clean and re install screen A d Replace gasket B e Re install blowoff bushing E or cap F as required 1 4 to 2 21 GENERAL CONFIGURATION OF STANDARD U TUBE HEATING ELEMENTS Z PASS TOP GASKET TOP GASKET D GASKET D O D G Q TUBE SHEET TUBE SHEET TUBE SHEET UNLESS SHOWN DIFFERENTLY ON THE DRAWING THIS CONFIGURATION SHOULD BE CLOSELY FOLLOWED WHEN INSTALLING HEATING ELEMENTS 27 SINGLE SAFETY SOLENOID SYSTEM if installed PENN AQUA STAT 19 ABC II RANGE 100 TO 200 F SPDT 115 VOLTS TANK SHELL BY CONTR CPLG ASCO 3 WAY SOLENOID VALVE 8320 178 15 VOLTS TO AQUA STAT AIR LINE TO THE CONTROLLER US AIR LINE TO 4 CONTROL VALVE ENERGIZED AIR FLOWS BETWEEN 1 2 VENT DE ENE
18. pper to seal all pores 4 Galvanizing The steel pressure vessel is pickled and hot dipped in molten zinc to create a barrier which internally and externally protects the steel vessel for cold and hot water storage Optional Non Ferrous Tank Materials 1 Copper Silicon copper silicon alloy offers tremendous tank longevity due to its ability to withstand the cycling effects induced from changes in water temperature and pressure This material is suitable for storage of hot potable water in a variety of commercial and industrial applications 2 90 10 Copper Nickel 90 copper and 10 nickel alloy similar to copper silicon but with added strength and corrosion resistance Typically used in applications with corrosive environments salt water or critical applications 3 Stainless Steel Stainless steel type 304 316 3161 is well suited for high purity applications requiring a corrosion resistant tank with minimal leaching of impurities into the water Well suited for process RO and DI water systems in the pharmaceutical food and electronic industries TANK CONNECTIONS The heater is supplied with separate cold water and hot water connections A connection is provided for mounting a combination safety temperature and pressure relief valve An overflow line should be utilized from the relief valve outlet to a floor drain See drawing for locations and sizes OUTER SHELL INSULATION AND SUPPORTS The tank is encaps
19. roximately 30 F below desired temperature observe unit if unit operates properly gradually raise set point to desired set point 3 Ifunit has a safety system set hi limit thermostat to desired temperature This thermostat must be set at a higher temperature than the operating thermostat or the unit will never reach the desired temperature Refer to the enclosed piping and wiring drawings 4 Gradually open valve to allow heating medium to enter the heating element Boiler water lines should be vented to eliminate trapped air Monitor the tank temperature until the desired temperature is reached If the temperature regulator shuts off before the desired temperature is reached or if over shoot occurs adjustment of the temperature regulator will be required Refer to enclosed O amp M manuals for your specific control valve 5 After control valve adjustments have been made and the desired temperature has been reached open the valve on the hot water outlet and the building recirculation line 6 Tightening of some gasketed joints may be required after unit has been heated 7 Never break any joint gasketed or screwed on unit until the pressure in the unit has been reduced to zero and the unit drained 8 Observe operation of unit for 30 40 minutes after initial start up 16 SHUTDOWN l 2 Close valve to heating medium and air supply valve if air operated controls are furnished Disconnect all electrical power to unit Close ho
20. s Shutoff for Hot Water Supply Systems ANSI Z21 22 1971 THE CUSTOMER IS RESPONSIBLE TO PROTECT PROPERTY AND PERSONNEL FROM HARM WHEN THE VALVE FUNCTIONS water heaters have a risk of leakage at some unpredictable time IT IS THE CUSTOMER S RESPONSIBILITY TO PROVIDE A CATCH PAN OR OTHER ADEQUATE MEANS SO THAT THE RESULTANT FLOW OF WATER WILL NOT DAMAGE PROPERTY If unit is painted or insulated on the job site care should be taken not to paint or insulate over the A S M E nameplate This plate should be accessible and legible at all times to inspectors and information from this plate must be used when ordering parts from the factory The tank should be fully drained in the event the steam has been turned off and if there is danger of freezing If tank is drained and to be left empty for more than 8 hours at least 2 inches of water should be left in the bottom of cement lined tanks to prevent lining from drying and cracking WATER HEATER PLACEMENT 1 Adequate space should be provided for removal of heating element 2 Unit should be level to permit proper drainage PIPING INSTALLATION NOTE The most effective means for preventing deterioration from accelerated corrosion due to galvanic and stray current is the installation of dielectric fittings unions The installation of these fittings is the responsibility of the installing contractor 1 All integral components have been properly sized to meet design conditions Piping to the unit shoul
21. should be utilized in the immediate steam piping system of the water heater The first trap in the system is a drip trap that is designed to collect condensate from the main steam line before entering the steam regulator Additionally a main condensate trap should be located in the condensate line after the steam coil This trap ensures that the steam remains in the coil and releases its energy before exiting the coil and traveling down the condensate line There are various types of traps available The following may be included in your water heater package 1 Drip Trap a Thermostatic Standard b Cast Iron Float and Thermostatic type c Cast Steel Float and Thermostatic type 2 Main Trap a Cast Iron Float and Thermostatic type Standard b Cast Steel Float and Thermostatic type c Bucket Steam Control Valves 1 Pilot Operated Standard A high quality cast iron pilot operated steam control valve comes with the standard unit It is the most widely used type of valve for water heating applications In this type of valve a temperature pilot device utilizes steam to operate the main valve No external power source is required other than steam This highly dependable temperature control system is suitable for most commercial and industrial applications 2 Self Operating This valve design includes a bulb and capillary assembly charged with a thermally responsive vapor The expansion contraction of the vapor acts upon the valve bellows i
22. t water outlet valve Close building recirculation inlet valve and shut down building circulation pump Close cold water inlet valve Turn off pump if supplied Drain unit by lifting lever on relief valve to vent tank then slowly open drain valve 17 SECTION III SCHEDULED MAINTENANCE AND SERVICING WARNING CAUTION Before performing any maintenance procedure make certain steam supply and electrical power supply is OFF and cannot accidentally be turned on QUARTERLY INSPECTION l 2 Monitor thermostat a Let water heater completely heat to a designated thermostat setting b After thermostat satisfies that is when the thermostat actually clicks off draw water from heater c Compare water temperature of drawn water to the temperature setting of the thermostat when it satisfies Normal variation between the two points is approximately 5 F d Ifthese two readings do not coincide within acceptable tolerances and verification has been made of the accuracy of the temperature reading gauge replace the thermostat Lift test lever on relief valve and let water run through valve for a period of approximately 10 seconds This will help flush away any sediment that might build up in water passageways ANNUAL INSPECTION 18 l 2 Units subject to fouling scaling should be cleaned periodically marked increase in pressure drop and or reduction in performance usually indicates cleaning is ne
23. ulated in 2 inches of high density fiberglass insulation The protective shell is constructed of galvaneel and is coated with a durable silver hammertone finish The entire vessel is supported on heavy duty integrally welded steel supports for sturdy floor mounting STEAM HEATING COIL The water heater is supplied with a high quality factory installed 2 pass U tube heating coil constructed from 20 gauge 4 inch O D single wall copper tubing designed for a maximum working pressure of 150 psi The tubing is installed in a heavy duty fabricated steel head with threaded NPT steam and condensate connections Each assembly is fastened to a corresponding tank flange using a gasket and hex head steel bolts and nuts Specialized heating coil construction may be included These options include double wall tubing with a leak detection port or special materials stainless steel 90 10 copper nickel other for the tubes and or head See drawing for complete details 10 STEAM OPERATING CONTROLS The steam operating controls are factory selected sized piped and tested to ensure reliable operation Steam controls can be shipped loose upon request for in the field installation by others steam components are factory plumbed with schedule 40 black iron pipe and ready for steam and condensate connections A cast iron strainer with 20 mesh screen protects the steam controls and coil from dirt and debris in the steam supply Traps Two traps
24. y system dumps over heated water in the storage tank to drain in addition to closing the steam supply to the control valve This option requires 120 volt 5 amp electrical service Anticipator Control System The anticipator control system forces incoming cold water over the control valve sensing bulb in order to begin heating water immediately Skid Mounting Optionally the unit may be mounted on heavy duty all welded I beams Circulating Pump Package An intra tank circulation pump package with On Off switch to continuously circulate water within the tank and thereby reduce stratification may be installed An all bronze circulator pump Dial Temperature and Pressure Gauge A combination temperature 70 250 and pressure 0 200 psi gauge with 22 inch dial may be factory installed in the tank 12 SECTION II INSTALLATION AND OPERATION WARNING CAUTION DO NOT TURN ON THE STEAM SUPPLY to this unit until heater is completely filled with water and all air has been released If the heater is NOT filled with water when the steam supply is turned on damage to the heating coil may result For protection against excessive pressures and temperatures local codes require the installation of a temperature and pressure T amp P relief valve certified by a nationally recognized laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves and Automatic Ga
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