Ao-smith 12 40GPC T 100 Manuel d'utilisateur

1Printed in U.S.A. 10/10 318181-000SERVICE HANDBOOK FOR STANDARD RESIDENTIALHIGH EFFICIENCY ATMOSP

10• The connector must be firmly attached and sealed to prevent it from falling out.• To aid in removing the connector, a thimble or slip joint may

11KNOW THE WATER HEATER’S COMPONENT PARTSFigure 11.Electronic Control Display (Upper Control)The Electronic Control Display panel used on this water h

12KNOW THE WATER HEATER’S COMPONENT PARTSBurner/Manifold Door AssemblyThe burner/manifold door assembly consists of several components such as: main b

13KNOW THE WATER HEATER’S COMPONENT PARTSFlammable Vapor Cut Off Switch (FV Sensor)The water heater is equipped with a FV sensor, for detecting the pr

14WATER HEATER OPERATIONThe figure below shows the water heater’s sequence of operation when a call for heat is initiated. The gas control valve/therm

15FILLING, DRAINING AND FLUSHING THE WATER HEATER TANKIt is recommended that the tank be drained and flushed every 6 months to remove sediment which m

16LIGHTING INSTRUCTIONSRead and understand these directions thoroughly before attempting to operate the water heater. Make sure the view port is not m

17ADJUSTING THE TEMPERATURE ON THEELECTRONIC CONTROL DISPLAYAdjusting the Temperature Set Point - The thermostat of this water heater has been factory

18USING THE ELECTRONIC CONTROL DISPLAYHow to select or change the temperature scale from Fahrenheit (°F) to Celsius (°C).Figure 22. 1. The temperatur

19USING THE ELECTRONIC CONTROL DISPLAYReviewing Fault Codes: 1. Press the red up arrow button one time. 2. The display will show either E0 or E1. 3.

2ALL TECHNICAL AND WARRANTY QUESTIONSSHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED.IF YOU ARE UNSUCCESSFUL, CONTACT

20 Please check guidelines below. For your safety, water heater service should be performed only by a qualied service person.Read the GENERAL SAFETY

21 6. “P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing The air pressure switch contacts remain open longer than 11 seconds after the combustion fan is en

22CONTROL DISPLAY TROUBLESHOOTING 11. “FV-SENSE” and “OPEN” Flashing Flammable Vapor Sensor is open 1. Check all wiring to the ammable vapor sens

23Please Note:The control continually monitorsinternal circuits and external sensors.Error codes noted above, and those forself-diagnostic faults can

24EXTERNAL INSPECTION AND CLEANINGCleaning the Air Intake Chamber Screen: • At least twice annually the air intake chamber screen should be

25ELECTRONIC CONTROL DISPLAY REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to proper

26POWERED ANODE ROD REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly perfor

27Installing the Powered Anode Rod:8. Use Teflon® tape or an approved pipe sealant on threads of the new powered anode rod.9. Prior to installing, it

28PRESSURE SWITCH REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform

29TRANSFORMER REMOVAL / REPLACEMENTgCOOLERHOTTERElectronic Control DisplayFigure 40.ON/OFF SWITCHONOFFFigure 41.UNPLUGGEDImportant: Use only factory a

3Your safety and the safety of others is extremely important in the servicing of this water heater. Many safety-related messages and instructions have

30Installing the New Transformer:10. Insert the wiring connector that goes to the gas control valve/thermostat through the wire protector on the side

31AIR INTAKE CHAMBER BOX REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly

3214. Rotate the top of the air intake chamber box from left to right (only a few inches in both directions) while pulling outward at the bottom remov

33Figure 53.SECURE WITH SCREWS REMOVED EARLIER25. Install the air intake chamber box by rotating the top of the air intake chamber box from left to ri

34WIRING HARNESS REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform t

35Replacing the Wiring Harness:13. Locate the male to female electrical connection with close pin lock on wiring harness (located on the right side of

3625. Install the air intake chamber screen, ensuring that the prongs of the lower portion of the air intake chamber screen are in place in the holdin

37AIR INTAKE CHAMBER FAN REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly p

38Installing the Fan in the Air Intake Chamber Box:11. Plug the electrical connections of the new fan into the wiring harness: Align the electrical c

39PRESSURE TUBING REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform

4Fire or Explosion HarzardDo not store or use gasoline or other flammable vapors andliquids in the vicinity of this or any other appliance. Avoid all

40Installing the Air Intake Chamber Box:11. Check the position the wiring harness wire in the wiring channeling molded down the back center of the ai

41INNER DOOR/MANIFOLD/BURNER ASSEMBLY REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills

42Installation Caution Must Be Taken:10. Prior to installing the new inner door/manifold/burner assembly, look inside the burner chamber to fully unde

43FLAME SENSE/HOT SURFACE IGNITER REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to

44BURNER REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the inst

45Removing Old Burner :11. After noting the position of the condensation drain hole on the top of the burner. Turn the inner door/manifold/burner ass

4616. After confirming no material of any type are between door gasket and combustion chamber shield, align the screws on the inner door with the scr

47BURNER ORIFICE REMOVAL / REPLACEMENTgCOOLERHOTTERElectronic Control DisplayFigure 102.ON/OFF SWITCHONOFFFigure 103.UNPLUGGEDImportant: Use only fact

48Removing Old Burner Orifice :11. Burner may be hot, wait until burner has cooled off. After noting the position of the condensation drain hole on t

49Reinstalling The Inner Door/Manifold/Burner Assembly17. Insert the manifold/burner assembly in the burner chamber compartment, making sure that the

5TABLE OF CONTENTSINTRODUCTION:Service Handbook Introduction ...

50GAS CONTROL VALVE/THERMOSTAT REMOVAL / REPLACEMENTImportant: Use only factory authorized replacement parts. If you lack the necessary skills to pro

5111. Ensuring that the gas supply line is turned off, disconnect the gas piping at the ground joint union, then remove the gas piping from the gas c

5223. Turn on the gas supply to the unit and test the gas supply line and union connections by brushing on an approved noncorrosive leak detection sol

53* To check where threaded portion enters tank, insert cotton swab between jacket opening and fi tting. If cotton is wet, follow draining instructio

54Draw efficiency is the quantity of hot water available to the consumer before the outlet water temperature decreases 25 degrees F. A 40 gallon wate

55One pound of gas pressure is equal to 27.7 inches water column pressure Inches of Water Column X .036091 = PSI Inches of Water Column

56ALL TECHNICAL AND WARRANTY QUESTIONS SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED. IF YOU ARE UNSUCCESSFUL, CONTA

6Exhaust Vent toOuside of BuildingUnionUnionWater Shut-Off ValveWater Supply- Cold*Expansion Tank Pressurize to EqualSupply Water Pressure*(Relieve wa

7COMBUSTION AIR AND VENT SYSTEM REQUIREMENTSTable 1:BTUH InputMinimum Square Feet with 8’ CeilingTypical Room with 8’ Ceiling30,000 188 9 x 2145,000 2

8COMBUSTION AIR AND VENT SYSTEM REQUIREMENTSAll Air from Inside the Building: When additional air is to be provided to the confi ned area from addition

9COMBUSTION AIR AND VENT SYSTEM REQUIREMENTSVent Connectors:1. Type B, Double wall, U.L. Listed Vent Pipe.2. Single wall Vent Pipe.Maintain the manu