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Summary of Contents for Hubbell ST
- Page 1 OPERATING AND MAINTENANCE MANUAL STEAM FIRED WATER HEATER ELECTRIC HEATER COMPANY BASE MODEL “ ST and STH ”...
- Page 2 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 1. Tank is to be completely filled with water and all air is to be vented before energizing.
- Page 3 SECTION TITLE PAGE No. GENERAL DESCRIPTION AND CONSTRUCTION INSTALLATION AND OPERATION SCHEDULED MAINTENANCE AND OPERATION ADJUSTMENT AND TEMPERATURE REGULATORS TROUBLESHOOTING MISCELANEOUS CHARTS AND FORMULAS...
- Page 5 NOMENCLATURE FOR PARTS...
- Page 6 NOMENCLATURE FOR ACCESSORY PARTS...
- Page 7 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, steam regulator, steam drip trap, condensate trap, steam strainer, condensate strainer, vacuum breaker, and an ASME rated combination temperature and pressure safety relief valve.
- Page 8 OUTER SHELL, INSULATION, AND SUPPORTS The tank is encapsulated 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.
- Page 9 vapor acts upon the valve bellows in 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.
- Page 10 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.
- Page 11 Typical Piping Diagram ELECTRICAL INSTALLATION 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 for required connections.
- Page 12 3. All other 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.
- Page 13 QUARTERLY INSPECTION 1. 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.
- Page 14 11. Convection packages may be equipped with an integral 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.
- Page 15 In the unlikely event a crack greater than 3 mm (1/8”) develops, the cement lining can be easily repaired in the field. For repair procedures please contact Hubbell a. Shut down unit as described in Section II.
- Page 17 SINGLE SAFETY SOLENOID SYSTEM (if installed)
- Page 18 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.
- Page 19 be increased. d. 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.
- Page 20 c. Spence Valves: There is no main spring adjustment on Spence Valves. To set temperature on the water heater: (1) Turn pilot spring adjustment “A” 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 “A”...
- Page 21 Overheating. Temperature regulator Repair or replace per separate has lost its charge, self O&M. contained valves only. Ruptured tube(s) in Remove / replace heating coil. heating coil. Temperature regulator Adjust temperature regulator per needs adjusting. Section IV. Circulator not operating. Repair or replace per separate O&M.
- Page 22 SECTION VI – MISCELLANEOUS CHARTS AND FORMULAS TORQUE VALUES SILICON ALUMINUM 18-8 S/S BRASS 316 S/S MONEL BOLT SIZE BRONZE 2024-T4 IN.-LBS. IN.-LBS. IN.-LBS. IN.-LBS. IN.-LBS. IN.-LBS. 4-40 4-48 5-40 5-44 6-32 10.1 6-40 12.1 11.2 12.7 12.3 8-32 19.8 16.2 18.4 10.8...
- Page 23 NOTES...
- Page 24 P.O. BOX 288 STRATFORD, CT 06615-0288 PHONE: (203) 378-2659 FAX: (203) 378-3593 INTERNET: http://www.hubbellheaters.com/...
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