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12

1.  Provide complete combustion of gas.

2.  Cause rapid ignition and carryover of flame across entire burner.

3.  Give reasonably quiet operation during ignition, burning and extinction.

4.  Cause no excessive lifting of flames from burner ports.

If preceding burner characteristics are not evident, check for accumulation 

of lint or other foreign material that restricts or blocks the air openings 

to the heater or burner.

  WARNING

SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES 

CORRECTION BEFORE FURTHER USE. CONSULT WITH A 

QUALIFIED SERVICE TECHNICIAN.

Should the main burner or burner air openings require cleaning, remove 

the burner and clean with a soft brush. Clean main burner orifice with a 

suitable soft material.  

CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILATING AIR 

TO THE UNIT. MAINTAIN A CLEAR OPEN AREA AROUND THE HEATER 

AT ALL TIMES. DO NOT STORE COMBUSTIBLES OR FLAMMABLE 

LIQUIDS NEAR OR AROUND AN APPLIANCE.

CHECKING GAS INPUT

For appliance installation locations with elevation above 2000  ft.(610m) 

refer to HIGH ALTITUDE INSTALLATIONS section of this manual for 

input reduction procedure.

With this heater in operation, determine whether it is receiving the full rated 

input of gas.  This may be done by timing the gas meter and measuring 

gas pressure with a gauge or manometer.  When the heater is operating 

at full capacity (full gas input) it should consume approximately 1 cubic 

foot of gas in the time shown in table 6.

 

TABLE 6 

 INPUT CHECK TIME REQUIRED TO

 

CONSUME 1 CU. FT. OF GAS

Use this formula to “clock” the meter.  Be sure that other gas consuming 

appliances are not operating during this interval.

 

3,600  X  H  =  Btu/h

 

   T

 

T  =  Time in seconds needed to burn one cubic foot of gas.

 

H = Heating value of gas in Btu’s per cubic foot of gas.

 

Btuh = Actual heater input rate.

 Example:

 

T  =  47.2 seconds/ft

3

 

H  =  1,050 Btu/ft

3

 (natural gas)

 

Btuh  =  ?

 

3,600  X  1,050  =  75,100 Btu/h (22Kw)

 

 50.3

Compare the actual input rate to that given on the heater’s rating plate.  

In the example, the full input rate should be 75,000 Btu/h (22 Kw) for 

natural gas.

VENT SYSTEM

Examine the venting system every 6 months for obstructions and/or 

deterioration of vent piping.

6.  After it has been determined that each appliance connected to the 

venting system properly vents when tested as outlined above, return 

doors, windows, exhaust fans, fireplace dampers and any other gas 

burning appliance to their previous conditions of use.

7.  If improper venting is observed during any of the above tests, the 

venting system must be corrected.

 WARNING

FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR 

CONTAMINATION AND UNSAFE CONDITIONS.

HIGH TEMPERATURE LIMIT SWITCH (ECO)

The water heater is equipped with a manual reset type high limit (Energy 

Cutoff) sensor. The high limit switch interrupts the main burner gas flow 

should the water temperature reach 195°F (90°C). The high limit switch 

must be manually reset by turning the power to the water heater off for 5 

seconds then back on and cannot be reset until the water temperature 

drops below 120°F (49°C). It is important that a serviceman be called 

to determine the reason for limit operation and thus avoid repeated 

thermostat resetting.

  

 WARNING

THE ON/OFF SWITCH MUST HAVE BEEN IN THE OFF POSITION 

FOR AT LEAST 5 MINUTES.  This waiting period is an important 

safety step.  Its purpose is to permit gas that may have accumulated 

in the combustion chamber to clear.  IF YOU DETECT GAS ODOR AT 

THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING. 

RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY 

INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE IN 

THE AREA WITH RISK OF FIRE OR EXPLOSION.  SEE THE FRONT 

PAGE FOR STEPS TO BE TAKEN.

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO 

SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO 

THE APPLIANCE.

SERVICE INFORMATION

The installer may be able to observe and correct certain problems 

which may arise when the unit is put into operation.  HOWEVER, it is 

recommended that only qualified servicemen, using appropriate test 

equipment, be allowed to service the heater.

FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS 

RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A YEAR 

BY A COMPETENT SERVICE PERSON.

USERS OF THIS WATER HEATER SHOULD BE AWARE THAT GAS 

COMPONENTS WEAR OUT OVER A PERIOD OF TIME.  THE GAS 

CARRYING COMPONENTS OF THIS WATER HEATER SHOULD 

BE INSPECTED FOR PROPER OPERATION PERIODICALLY BY A 

QUALIFIED SERVICE TECHNICIAN.

MAIN BURNER AND IGNITER

Check main burner (figure 7) at least every 6 months for proper 

flame characteristics.  The main burner should display the following 

characteristics:

FIGURE 7. MAIN BURNER AND IGNITER ASSEMBLY

Type of Gas

BTU Per Cu. Ft.

Time Required To Con-

sume 1 Cu. Ft. of Gas

Natural

1050

50.3 Seconds

BURNER HEAD

ASSEMBLY

BURNER TUBE

ASSEMBLY

H.S.I.

ASSEMBLY

Summary of Contents for BBCN375T754NV 100 Series

Page 1: ...AL ULTRA LOW NOx GAS WATER HEATER Glass Lined Tank type Water Heater INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE T...

Page 2: ...Canada Current edition of the Installation Code CAN CSA B149 1 and the Canadian Electrical Code CSA C22 1 These are available from Canadian Standards Association 8501 East Pleasant Valley Road Clevel...

Page 3: ...r and Igniter 12 Checking Gas Input 12 Vent System 12 Blower Maintenance 13 Relief Valve 13 Hot Water Odor 13 Winter Protection 13 Replacement Parts 13 PREVENTIVE MAINTENANCE 13 14 Procedure for Perio...

Page 4: ...gas in excess of the safe limits This could result in serious injury or death Contact your local gas supplier for any specific changes that may be required in your area Upon completion of derating of...

Page 5: ...THROUGH THE CHIMNEY OR VENT PIPE The venting of the water heater should be inspected by a qualified service technician at the time of installation and periodically thereafter to ensure a down draft c...

Page 6: ...t of the vent system are exposed to ambient temperatures below 35 degrees F 2 degrees C it must be insulated to prevent condensation Do not connect the heater to a common vent or chimney with solid fu...

Page 7: ...E LOCATION TO AVOID SCALDING OR WATER DAMAGE THIS LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS DO NOT...

Page 8: ...having jurisdiction AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION If any of the original wire as supplied with the appliance must be replaced use only t...

Page 9: ...matic gas valve while heater is operating TABLE 5 Type of Gas Input Manifold Pressure Natural 75 100 Btu hr 22 KW hr 4 0 in W C 1 12 kPa OPERATION It is recommended that a qualified person perform the...

Page 10: ...as been under water OPERATING INSTRUCTIONS A Set thermostat to the lowest setting B Turn off all the electric power to the appliance if service is to be performed TO TURN OFF GAS TO APPLIANCE BEFORE O...

Page 11: ...akage corrosion and other deficiencies which could cause an unsafe condition 3 So far as is practical close all building doors and windows and all doors between the space in which the water heater s c...

Page 12: ...rn doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous conditions of use 7 If improper venting is observed during any of the above tests the venting syst...

Page 13: ...anode as necessary to maintain corrosion protection For further information contact your dealer WINTER PROTECTION In regions where freezing weather is encountered all water must be drained from unit...

Page 14: ...the Flo Jug kit This screw is to be installed in the vent hole when Flo Jug is not in use Remove drain valve from heater and insert a 3 4 x 4 nipple Connect and clamp 1 I D x 3 hose to Flo Jug and hea...

Page 15: ...idence of poor vent action Possible causes are too long a vent pipe or improper chimney operation 3 If the leakage is from the temperature and pressure relief valve or its discharge pipe it may repres...

Page 16: ...information and tables may serve to answer your question about a problem that you are having without having to call a service agent For your safety water heater service should be performed only by a q...

Page 17: ...a qualified person for service 3 Thermostat problems A Thermostat set too low Set temperature control higher B Thermostat or ECO defective Replace gas control valve thermostat C High limit control ci...

Page 18: ...control does not energize the blower replace the Intelli Vent control If the blower fails to Blower may run continuously in start when energized replace the blower assembly this condition 2 Ensure the...

Page 19: ...ff for 10 20 seconds then on again to clear this error code 4 Ensure the flame sensor is clean use ultra fine steel wool or Scotch Brite pad to clean flame sensor 5 Ensure the hot surface ignitor is p...

Page 20: ...in tolerance 1 Ensure air pressure switch hose is not kinked or clogged ensure the blower housing is clear of any condensation 2 Check vent temperature limit switch if it is determined that the vent t...

Page 21: ...21 NOTES...

Page 22: ...22 NOTES...

Page 23: ...hod of controlling thermal expansion 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 U...

Page 24: ...nson City TN 37605 Phone 800 456 9805 Fax 800 999 5210 www americanwaterheater com Copyright 2012 American Water Heater Company All rights reserved www americanwaterheater com American Water Heater Jo...

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