Instruction Manual HOT WATER GENERATING SYSTEMS VERTICAL AND HORIZONTAL MODELS HWG-140 THRU HWG-1000 INSTALLATION - OPERATION - SERVICE MAINTENANCE - LIMITED WARRANTY A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON www.hotwater.com ASME Thank you for buying this water heater. We appreciate your confidence in our products. place these instructions adjacent to heater and notify owner to keep for future reference.
SAFE INSTALLATION, USE AND SERVICE Your safety and the safety of others is extremely important in the installation, use, and servicing of this water heater. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual.
GENERAL SAFETY INFORMATION PRECAUTIONS HYDROGEN GAS (FLAMMABLE) DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system which has been under water. If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified service agency. 1. 2. 3. External fire. Damage. Firing without water.
TABLE OF CONTENTS Safe Installation, Use and Service....................................2 General Safety INFORMATION.................................................3 ELECtrical data...........................................................................9 Precautions................................................................................3 General......................................................................................9 Hydrogen Gas (Flammable)........................
FEATURES, COMPONENTS, AND DIMENSIONS 5
TYPICAL WATER HEATER TRIM FIGURE 3. TYPICAL STEAM TO WATER PIPING FIGURE 4.
APPROVALS ASME MODEL AND RATING LOCATING THE NEW WATER HEATER Facts to Consider About the Location Whether replacing an old water heater or putting the water heater in a new location, the following critical points should be observed. The water heater should be located: 1. On a level surface. Shim the channel type skid base as necessary if levelling is required. 2. Near a floor drain.
INSTALLATION Required Ability Installation or service of this hot water generator requires ability equivalent to that of a licensed tradesman in the field involved pipe fitting in the steam or boiler water is required. See Qualified Installer or Service Agency on page 2. temperature-pressure Relief Valve The Discharge Pipe: • Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions. • Shall not be plugged or blocked.
thermal expansion Steam Supply (steam units only) As water is heated, it expands (thermal expansion). In a closed system the volume of water will grow when it is heated. As the volume of water grows there will be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty.
WIRING DIAGRAMS WIRING DIAGRAM - ELECTRONICALLY ACTUATED CONTROL VALVE FIGURE 5 WIRING DIAGRAM - SELF ACTUATED CONTROL VALVE FIGURE 6 10
OPERATION General safety It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature be set for the lowest temperature which satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater.
MAINTENANCE Note: See attached vendor information for maintenance of components. General to drain the shell section down once a ear, refill it and drain it again. The heating coil should be inspected and cleaned of any scale or mineral deposits that may attach themselves to the heating surface. The heating surface may be cleaned. Refer to vendor’s heat exchanger instruction sheet. Once a month the temperature/pressure relief valve should be checked to ensure that it is in operating condition.
Water leakage is suspected 3. Remove sediment and scale from the tank bottom through the access provided by the element opening or tank cleanout, if furnished. • 1. Check to see if the drain valve is tightly closed. The cold water inlet valve and drain valve may be opened to aid the cleanout process. 4. Follow FILLING instructions to restore hot water service. 2. The apparent leakage may be condensation which forms on cool surfaces of the heater and piping. 3.
TROUBLESHOOTING Trouble Shooting Guide for HWG Problem Slow or Inadequate Heat Recovery Water Hammer in Tube Bundle Overheating of water in storage Excessive Pressure Causing Relief valve to Pop: Possible Malfunction Service to be Performed Dirty or fouled heating surface. Clean the heating surface. Condensate may be held in coil. Check trap, air vent & vaccum breaker on heating coil. Flooded tube bundle. Improper condensate drainage. This will reduce coil capacity and service life.
WARRANTY A. O. Smith, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater: 1. THE TANK If the tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first FIVE years after initial installation, the warrantor will supply a complete new A. O. Smith water heater of equivalent size and current model.
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A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON Technical Support: 800 527-1953 Parts Department: 800 433-2515 www.hotwater.
