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14

TANK CLEANOUT PROCEDURE

The following practices will ensure longer life and enable the unit to 

operate at its designed efficiency:

1.  Once a month the heater should be flushed.  Open the drain valve 

and allow two gallons of water to drain from the heater.  Inlet water 

valve should remain open to maintain pressure in tank.

2.  A cleanout opening is provided for periodic cleaning of the tank.  

Gas must be shut off and heater drained before opening cleanout.

To clean heater through cleanout opening, proceed as follows:

1.  Drain heater.

2.  Remove outer cover plate from lower side of heater jacket.

3.  Remove six (6) hex head screws securing tank cleanout plate and 

remove plate.

4.  Remove lime, scale, or sediment using care not to damage the glass 

lining.

5.  Inspect cleanout plate gasket, if new gasket is required.

6.  Install cleanout plate.  Be sure to draw plate up tight by tightening 

screws securely.

7.  Replace outer jacket cover plate.

In some water areas the sediment might not be removed by this method 

and may result in the water heater making rumbling or boiling noises.  To 

dissolve and remove these more stubborn mineral deposits, UN•LIME 

Professional Delimer should be used.

 

FIGURE 9

FLO-JUG METHOD OF DELIMING

The Flo-Jug is the standard 5 gallon container for UN•LIME -or- it is 

available as a deliming kit with hose and fittings.  Contact your dealer 

or distributor.

Figure 9 illustrates most of the following steps.

1.  The heater should be prepared for deliming as described in the 

“Why? When and How” booklet.  The relief valve may also be delimed 

at this time.

2.  With the Flo-Jug upright:

 

•  Take off cap, remove cover under opening and install 3/4" x 4" 

pipe nipple.

 

•  Drill or punch a 3/16" vent hole in handle.  A stainless steel screw 

is included with 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 heater nipple.

3.  Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME 

to flow into the heater as rapidly as possible.

 

•  Be sure to keep the vent just above the liquid level.

4.  Place the Flo-Jug in the DELIME POSITION.

 

•  It may be necessary to place the empty jug on its carton to trap 

the solution in the heater.

 

•  Allow the UN•LIME to attack the water scale for 5 minutes.

5.  Lower the Flo-Jug to the DRAIN POSITION and allow the UN•LIME 

to flow out of the heater as rapidly as possible.

 

•  Observe the vent holes and elevate the jug slightly if there is a 

possibility of spillage.

 

•  Deliming activity is indicated by foaming on the surface of the 

solution.

6.  Continue the deliming process:

 

•  Raise jug to POUR POSITION.  Allow solution to flow into heater.

 

•  Place jug in DELIME POSITION for 5 minutes. Solution is at 

work in heater.

 

•  Lower jug to DRAIN POSITION and allow solution to flow out. 

Observe foaming.

7.  After one hour, or earlier if the deliming activity (foaming) stops, 

inspect the tank interior.

 

•  Drain the UN•LIME back into jug, DRAIN POSITION, and then 

stand jug in DELIME POSITION.

 

•  Remove the clamp, hose and the pipe nipple from heater 

drain opening.

 

•  Observe interior through opening - a small flashlight may be 

used effectively.

 

•  If the interior still shows water scale, the deliming process should 

be continued.

 

•  To check UN•LIME for continued use or reuse, place some lime 

scale or white chalk into a glass with a small amount of solution.  If 

the material is vigorously dissolved by the solution, the UN•LIME 

can be reused.  If not, the UN•LIME has been weakened and 

should be replaced.

8.  When deliming has been completed, the heater should be flushed 

for 3 to 5 minutes with fresh water.

 

•  Remove the deliming equipment, install the drain valve, open the 

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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