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Hubbell STH - page 1
OPERATING AND MAINTENANCE MANUAL FOR STEAM FIRED WATER HEATER ELECTRIC HEATER COMPANY BASE MODEL “ ST and STH ” ...
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Hubbell STH - page 2
2 HUBBELL ELECTRIC HEATER COMPANY P.O. BOX 288 STRATFORD, CT 06615 PHONE: (203) 378-2659 FAX: (203) 378-3593 INTERNET: htt p://www.hubbellhe ate rs.co m/ -- IMPORTANT -- Always reference the f ull model num ber and serial number when calling the factory. WARNING / CAUTION 1. Tank is to be complete ly filled with water and all air is to be vente d b ...
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Hubbell STH - page 3
3 TABLE OF C ONTENTS SECTION TITLE PAG E # I GENERAL DESCRI PTION AND CONSTRUCTI ON 9 I I INSTAL L ATION AND OPERATI ON 13 III S C H E D U LE D M A IN TE NANC E AND SERVICI NG 18 I V ADJUSTMENT OF TEMPERATURE REGULATORS 25 V TROUBLESHOOTI NG 28 VI MI SCELL ANEOUS CHARTS AND FORMULAS 30 ...
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6 NOMENCLATURE FOR PARTS ...
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7 NOMENCLATURE FOR ACCE SSORY PARTS ...
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Hubbell STH - page 9
9 SECTION I - GENERAL DESCRIPTION AND CONST RUCTION 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, steam regulator, steam drip trap, condensate trap, steam strainer, condensate str ...
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Hubbell STH - page 10
10 3. Stainless Steel – Stainless steel (ty pe 304, 316, or 316L) 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 sy stems in the pharmaceutical, food, and electronic industries. TANK CONNECTIONS The heater is supplied wi ...
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Hubbell STH - page 11
11 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. All steam components are factory plumbed with schedule 40 black iron pipe and ready for steam and condensate connections. A ...
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Hubbell STH - page 12
12 OPTIONS The following optional features may be included in your water heater. Reference the drawing specific to y our heater for further details. Single Solenoid Safet y 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-v ...
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Hubbell STH - page 13
13 SECTION II – INSTALLATION AND OPERATION WARNING / CAUTION DO NOT TURN ON THE STEAM SUPPL Y to this unit until hea ter 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 tem ...
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Hubbell STH - page 14
14 3. I nstall the combination temperature and pressure safety relief valve in the tapping provided. Note that this is required by law for safety considerations. Outlet to floor drain I n s t a l l i n t o p r o v i d e d t a p p i n g Manual Release Lev e r T e m p e r a t u r e P r o b e 4. I nstall a relief valve overflow pipe to a nearby floor ...
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Hubbell STH - page 15
15 Typical Piping Diagram ELECTRICAL IN STALLATION 1. If the 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 f or require ...
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Hubbell STH - page 16
16 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 wate r. L ift lever on relie f valve to relieve trapped air. Release relief val ve lever when all traces of ai r have been vented from the unit . ...
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Hubbell STH - page 17
17 SHUTDOWN 1. Close valve to heating medium and air supply valve, if air operated controls are furnished 2. Disconnect all el ectrical power to uni t. 3. Close hot water outlet valve. 4. Close building recirculation inlet valve, and shut down building circulation pump. 5. Close cold water inlet valve. 6. Turn off pump, if supplied. 7. Drain unit b ...
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Hubbell STH - page 18
18 SECTION III - SCHEDULED MAINTE NANCE 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 1. Monitor thermostat a. Le t water heate r completely heat to a desig nated thermosta t setting. b. After thermo ...
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Hubbell STH - page 19
19 11. Convection packages may be equipped with an integ ral circulator. This circulator should be serviced per the enclosed pump O&M manual. 12. The unit as well as all strainers should be blown down regularly to remove any trash, and sediment that may have accumulated. 13. I f unit is supplied with anode rod, it shall be inspected for excessi ...
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Hubbell STH - page 20
20 occur at this point, but a s the gasket se ats, leaking will g radually stop). After leak ing 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. I f seepage continues drain the tank, inspect the manhole ring, and cover for any damage, (repair or re ...
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Hubbell STH - page 21
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23 SINGLE SAF ETY SOLENOID SYSTEM (if inst alled) ...
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Hubbell STH - page 24
24 DOUBLE SAF ETY SOLENOID SYSTEM (if installe d) ...
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Hubbell STH - page 25
25 SECTION IV – ADJUSTMENT OF TEMPERATURE RE GULATORS 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 ...
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Hubbell STH - page 26
26 f. Apply air pressure to valve diaphragm so that stem halves are aligned and re-connect stem halves. g. If valve will not open with air on the diaphrag m, spring tension should be decreased. h. Adjustment is essentially the same as if spring tension wer e increase d except the adjustment screw is turned in the opposite direction. 5. ADJUSTMENT O ...
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Hubbell STH - page 27
27 c. Spence Valv es : There is no main spring adjustment on Spence Valves. To set temper ature on the water heater: (1) Turn pilot spring a djustment “A” cloc kwise until all tension is off the spring. (2) Refer to unit sta rt-up section a nd start unit except for the rmostat setting . (3) Turn spring adjustment “A” counter-clockwise until ...
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Hubbell STH - page 28
28 SECTION V – TROUBLESHOOTING (See separate component O &M for add itional d etails.) Symptom Probable Cause Corrective Action / Remedy T u b es a r e f o u l e d . C l e a n t u b e s p er S e c t i o n III, a nnual scheduled maintenance. Excess silt in bottom of tank. Drain and flush tank per Section III , annual scheduled maintenance. Air ...
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Hubbell STH - page 29
29 High rate of flow bey ond design conditions. Consult factory . Excessive vibration. Under sized piping to the unit. Re-pipe lines to unit using proper sized lines. Defective steam t rap. Repair or replace per separate O&M. Undersized condensate lines. Re-pipe condensate line using proper sized lines. Water ha mmer. I nsufficient slope on con ...
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Hubbell STH - page 30
30 SECTION VI – MISCELL ANEOUS CHARTS AND FORMULAS TORQUE VALUE S BOLT SIZE 18-8 S/S IN. - LB S . BRASS IN. - LB S . SI L I CON BRONZE IN. - LB S . ALUMI NUM 2024-T4 IN. - LB S . 316 S/S IN. - LB S . MONEL IN. - LB S . 4-40 5.2 4.3 4.8 2.9 5.5 5.3 4-48 6.6 5.4 6.1 3.6 6.9 6.7 5-40 7.7 6.3 7.1 4.2 8.1 7.8 5-44 9.4 7.7 8.7 5.1 9.8 9.6 6-32 9.6 7.9 ...
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Hubbell STH - page 31
31 METRIC CONVERSIONS ...
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