A.O. Smith 300A Page 40 Owner'S Manual Download | Manualshive

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Summary of Contents for 300A

Page 1: ...PERATION SERVICE MAINTENANCE LIMITED WARRANTY WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage personal injury or death D...

Page 2: ...the National Fire Protection Association 1 Batterymarch Park Quincy MA 02269 FOREWORD ROUGH IN DIMENSIONS Recovery capacities are based on heater performance at 96 thermal efficiency for BTH 300A 400A...

Page 3: ...s 22 23 Access to the Current Fault or Warning 23 Viewing the Fault History 24 Viewing Information About the Heater 24 PRIOR TO START UP REQUIRED ABILITY 25 OPERATING INSTRUCTIONS 25 Adjustment Proced...

Page 4: ...AT A GLANCE BTH 300 400 500 QUICK INSTALLATION TIPS Horizontal Sidewall Venting Vertical Rooftop Venting...

Page 5: ...conds 120 F 49 C More than 5 minutes FIGURE 1 Valves for reducing point of use temperature by mixing cold and hot water are available see Figure 2 Also available are inexpensive devices that attach to...

Page 6: ...in conjunction with the heater Refer to the piping diagrams at rear of manual for electrical hookup information and install in accordance with the current edition of the National Electrical Code NFPA...

Page 7: ...ck or stone construction unconfined spaces may provide adequate air for combustion and ventilation If the unconfined space is within a building of tight construction buildings using the following cons...

Page 8: ...ad in print size no less than one half 1 2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUCTIONS INSPECTION The state or local gas inspector of the side wall horizontally vented gas fuel...

Page 9: ...ECT VENT CANADIAN DIRECT VENT FIGURE 5 CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY COLD AREAS THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOM...

Page 10: ...NTAL VENT CANADIAN HORIZONTAL VENT FIGURE 6 CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY COLD AREAS THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS...

Page 11: ...PORTANT Plan the layout of the vent system backwards from the vent termination to the appliance WARNING USE ONLY THE VENT TERMINALS SUPPLIED WITH THIS UNIT TERMINATIONOFAVENTSYSTEMWITHADEVICEOTHERTHAN...

Page 12: ...VC pipe about 3 5 8 9 cm longer than the wall thickness at the opening 5 Glue the intake vent terminal to the section of the pipe 6 Slide the wall plate over the pipe to stop against intake vent termi...

Page 13: ...of 4 inch pipe for the exhaust venting arrangement of 15 equivalent feet This is the minimum amount of pipe required for the exhaust venting arrangement The intake venting arrangement is certified to...

Page 14: ...ver Switch is provided on the heater to verify that the fan is operating It is a positive pressure switch whose electrical contacts are normally open When the fan increases the pressure in the burner...

Page 15: ...GAS PIPE IS CLEAN ON THE INSIDE TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE A DIRT LEG SOMETIMES CALLED A SEDIMENT TRAP OR DRIP LEG MUST BE INCORPORATED IN THE PIPING SEE FIG 14 THE DI...

Page 16: ...e relief CSA ratings cover release rate with temperature actuation FOR SAFE OPERATION OF THE WATER HEATER THE RELIEF VALVE S MUST NOT BE REMOVED OR PLUGGED In addition to the appliance relief valve ea...

Page 17: ...ELECTRICITY FOR PROPER OPERATION INSTALLING THE HEATER ON A BRANCH CIRCUIT THAT HAS ELECTRONIC NOISE IS SUBJECT TO FLUCTUATIONS IN VOLTAGE LEVEL OR HAS AN APPLIANCE WHICH GENERATES EMF OF RFI INTERFE...

Page 18: ...18 FIGURE 15 BTH 300 WIRING DIAGRAM...

Page 19: ...19 FIGURE 16 BTH 400 AND 500 WIRING DIAGRAM...

Page 20: ...run for the duration of the post purge cycle to purge the system of all combustion gases When the post purge cycle is complete the blower is de energized and will coast to a stop 11 The control will n...

Page 21: ...water heater determines the regulated temperature for the water in the tank This parameter is adjusted in the Temperature menu Items in this menu allow you to monitor different temperature readings in...

Page 22: ...that occurs the water heater controls will detect this condition and determine the appropriate action Part of this is displaying the information on the LCD in plain text that accurately describes the...

Page 23: ...d information can be found in the control By pressing the Advanced button detailed information can be found regarding diagnosing and resolving the problem WARNING Usage of the Advanced information req...

Page 24: ...an be accessed at any time 8 Viewing Information About the Heater The electronic control for this water heater monitors many different aspects of the water to ensure safe and optimal operation Much of...

Page 25: ...R TO START UP REQUIRED ABILITY INSTALLATIONORSERVICEOFTHISWATERHEATERREQUIRES ABILITY EQUIVALENT TO THAT OFALICENSED TRADESMAN IN THE FIELD INVOLVED PLUMBING AIR SUPPLY VENTING GAS SUPPLY AND ELECTRIC...

Page 26: ...ERSONAL INJURY OR LOSS OF LIFE 1 STOP Read the safety information above on this label 2 Set thermostat to lowest setting 3 Turn off all electric power to the appliance 4 This appliance is equipped wit...

Page 27: ...ALTITUDES UP TO 10 000 FEET INSTALLATIONS ABOVE 10 000 FEET MAY REQUIRE REPLACEMENT OF THE BURNER ORIFICE CALL THE TECHNICAL INFORMATION CENTER AT 800 527 1953 FOR REQUIREMENTS Some gas utility compa...

Page 28: ...about 1 2 5cm of lime buildup if it has reached the drain valve opening A schedule for deliming should be set up based on the amount of time it would take for a 1 2 5cm buildup of lime Example 1 Init...

Page 29: ...D MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT THE VALVE DURING THIS CHECKING OPERATION If the temperature and pressure relief valve on the heater discharges periodically or continuously it may b...

Page 30: ...R SUPPLIED TO FIXTURES PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH LOCAL CODES CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS...

Page 31: ...DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPU...

Page 32: ...CIFICATIONS PAGE 35 CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST B...

Page 33: ...ECT CIRCULATING LINE OF 180 F 82 C OR BOOSTED WATER IF USED TO INLET WATER LINE TO BOOSTER INSTALL IN ACCORDANCE WITH LOCAL CODES TWO TEMPERATURE TWO HEATERS ONE PRE HEATER ONE BOOSTER HEATER WITH OR...

Page 34: ...TE 4 IF TEMPERED WATER IS RECIRCULATED RETURN LINE SHOULD BE CONNECTED AT POINT A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAG...

Page 35: ...ting and storage potential of the system cannot be achieved Plus the units with the higher water flow may have a shortened life Dimensions shown are for minimum space occupied by the water heaters ass...

Page 36: ...brush 10 Condensate hose may be blocked where it connects to the exhaust elbow Verify the condensate drains from the unit without restriction WATER IS TOO HOT 1 Refer to WATER TEMPERATURE CONTROL WAT...

Page 37: ...igniter terminal with an OHM meter If there is no continuity the igniter is broken and should be replaced If the igniter appears to function properly then verify that the inlet pressure is 11 0 Natura...

Page 38: ...immediately NOISY BURNER OPERATION The exhaust of this unit produces some noise during ignition period When combustion is too lean or too rich start up noise will get worse Check for flue gas CO2 read...

Page 39: ...n is also installed at the heater s and operational at all times The relief valve installed on the heater is not an acceptable method 4 SERVICE AND REPAIR EXPENSES Under the limited warranty the warra...

Page 40: ...40 www hotwater com...

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