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THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS

 NOT 

SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.

DO  NOT  LOCATE  THE  HEATER  WHERE  NOISE  FROM  THE 

EXHAUST  OR  INTAKE  WILL  BE  OBJECTIONABLE.  THIS 

INCLUDES  LOCATIONS  CLOSE  TO  OR  ACROSS  FROM 

WINDOWS AND DOORS. AVOID ANCHORING THE VENT AND 

INTAKE  PIPES  DIRECTLY TO  FRAMED  WALLS,  FLOORS  OF 

CEILINGS  UNLESS  RUBBER  ISOLATION  PIPE  HANGERS 

ARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING 

TRANSMITTED INTO THE LIVING SPACES

.

 WARNING

FLAMMABLE  ITEMS,  PRESSURIZED  CONTAINERS  OR ANY 

OTHER  POTENTIAL  FIRE  HAZARDOUS ARTICLES  MUST 

NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN 

CONTAINERS  OF  FLAMMABLE  MATERIAL  SHOULD  NOT  BE 

STORED OR USED IN THE SAME ROOM WITH THE HEATER.

When  installing  the  heater,  consideration  must  be  given  to 

proper location. Location selected should be as close to the 

intake  and  exhaust  termination  points  as  practicable,  with 

adequate air supply and as centralized with the piping system 

as possible.

THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT

 

WILL BE SUBJECT TO FREEZING.
LOCATE  IT  NEAR A  FLOOR  DRAIN.  THE  HEATER  SHOULD 

BE

  LOCATED  IN AN AREA  WHERE  LEAKAGE  FROM  THE 

HEATER OR CONNECTIONS  WILL NOT RESULT IN DAMAGE 

TO THE ADJACENT AREA  OR TO  LOWER  FLOORS  OF THE 

STRUCTURE.

 

When such locations cannot be avoided, it is recommended that 

a

  suitable  drain  pan,  adequately  drained,  be  installed  under  the 

appliance.

 WARNING

THIS WATER HEATER IS A CONDENSING UNIT AND REQUIRES 

A DRAIN TO BE LOCATED IN CLOSE PROXIMITY TO ALLOW 

THE  CONDENSATE  TO  DRAIN  SAFELY.  THE  CONDENSATE 

DRAINS FROM THE UNIT AT THE EXHAUST ELBOW LOCATED 

AT THE BOTTOM OF THE UNIT. NOTE: IT IS IMPORTANT THAT 

THE  CONDENSATE  HOSE  NOT  BE  ELEVATED ABOVE  THE 

EXHAUST ELBOW (SEE FIGURE 3). THE CONDENSATE BUILD-

UP WILL BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE 

IMPROPER OPERATION.

FIGURE 3.

 WARNING

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 AND ANY GAS CONTROL 

WHICH HAS BEEN UNDER WATER.

CIRCULATING PUMP

A circulating pump is used when a system requires a circulating loop or 

there is a storage tank used 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 70 or the Canadian Electrical Code, CSA C22.1

.

All bronze circulators are recommended for used with commercial 

water heaters.
Although  circulators  are  oiled  and  operated  by  the  manufacturer 

some circulators must be oiled again before operated. Please refer 

to manufacturer's instructions.

INSTALLATION INSTRUCTIONS

REQUIRED ABILITY

I

NSTALLATION  OR  SERVICE  OF  THIS  WATER  HEATER 

REQUIRES ABILITY  EQUIVALENT TO THAT  OF A  LICENSED 

TRADESMAN  IN  THE  FIELD  INVOLVED.    PLUMBING, AIR 

SUPPLY,  VENTING,  GAS  SUPPLY AND  ELECTRICAL  WORK 

ARE REQUIRED.

INSULATION BLANKETS

Insulation blankets available to the general public for external use 

on gas water heaters are not approved for use on your A.O. Smith 

water heater. The purpose of an insulation blanket is to reduce the 

standby heat loss encountered with storage tank water heaters. 

Your A.O. Smith water heater meets or exceeds the ASHRAE/IES 

90.1-1999 standards with respect to insulation and standby loss 

requirements, making an insulation blanket unnecessary.

 WARNING

Should you choose to apply an insulation blanket to this heater, you 

should follow these instructions. Failure to follow these instructions 

can result in fire, asphyxiation, serious personal injury or death.

•    Do not

 apply insulation to the top, or the upper 15" (38 cm) of the 

water heater, as this will interfere with safe operation.

•    Do not

 cover the temperature & pressure relief valve.

•    Do not

 cover the instruction manual. Keep it on the side of the 

water heater or nearby for future reference.

•   Do

 obtain new labels from A.O. Smith for placement on the blanket 

directly over the existing labels.

LOCATING THE HEATER

 

WARNING

THERE  IS  A  RISK IN USING FUEL BURNING  APPLIANCES  

SUCH AS  GAS WATER HEATERS IN ROOMS, GARAGES OR 

OTHER AREAS    WHERE  GASOLINE,  OTHER  FLAMMABLE  

LIQUIDS  OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE 

STORED, OPERATED  OR REPAIRED. FLAMMABLE VAPORS 

ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE 

IGNITED  BY  THE  HEATER’S  IGNITER  OR  MAIN  BURNER 

FLAMES CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES 

PERMIT  OPERATION  OF  GAS   APPLIANCES    IF  INSTALLED 

18  INCHES  (46  cm)  OR  MORE ABOVE    THE    FLOOR.  THIS  

MAY  REDUCE  THE  RISK  IF  LOCATION IN SUCH  AN  AREA  

CANNOT  BE  AVOIDED.

Содержание 300A

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 40: ...40 www hotwater com...

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