A.O. Smith 12 50GPC T 100, PCG250T403NOV 100 Reinstalling The Inner Door/Manifold/Burner Assembly

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Reinstalling The Inner Door/Manifold/Burner Assembly

17.Insert the manifold/burner assembly in the burner chamber compartment, making sure that the tip of burner manifold tab engages in the slot of the bracket (Figure 107).

The tip end of the burner manifold MUST be placed in the slotted portion under the condensation pan to obtain proper installation (Figure 107).

18.After confirming no material of any type are between door gasket and combustion chamber shield, align the screws on the inner door with the screw holes on the combustion chamber and tighten with 1/4” nut driver or 1/4” socket & ratchet (Figure 106). After tightening the inner door screws, visually inspect area around door gasket and skirt for spaces or gaps. The door gasket MUST be sealed completely in order for the water heater to perform properly.

DO NOT OPERATE THE WATER HEATER IF THE DOOR GASKET DOES NOT CREATE A SEAL BETWEEN MANIFOLD DOOR AND COMBUSTION CHAMBER.

19.Reconnect the manifold tube to the gas control valve/thermostat (Note: Do Not apply any thread sealant at this connection). To prevent any cross threading the manifold tube should be started by hand (turn clockwise -natural gas). Upon tightening with the fingers and confirming it has not been cross threaded, tighten nut with an 3/4” open end wrench or crescent wrench (Figure 110).

20.Reconnect all the electrical connections to the bottom of the gas control valve/thermostat, gently pushing each connector up snapping into place (Figure 110).

21.Reconnect the electrical flag terminals and air pressure tubing to pressure switch (Figure 111).

22.Turn on the electrical and the gas supplies to the water heater. Plug in the electric connection from the transformer to the electric outlet (Figure 103).

23.Restart the water heater by following the directions on the “Lighting and Operating Instructions” label located on the front of the water heater.

24.As the burner is heating (view flames through viewport), test the manifold tube connection at the gas control valve/thermostat by brushing on an approved noncorrosive leak detection solution (IMPORTANT: Do Not splash any solution onto any electrical connections) (Figure 110).

25.Upon verifying proper operation of the water heater, replace the manifold cover/outer door.

Figure 110.

IMPORTANT:

 

 

WHEN BRUSHING ON AN

 

GAS CONTROL

APPROVED NONCORROSIVE

 

LEAK DETECTION SOLUTION,

 

VALVE/THERMOSTAT

DO NOT SPLASH SOLUTION

 

 

ONTO ELECTRICAL CON-

 

 

NECTIONS.

 

 

 

 

PRESSURE

MANIFOLD TUBE

 

SWITCH/FAN,

 

FV SENSOR

POWER SUPPLY

IGNITER/

CONNECTOR

 

TRANSFORMER

FLAME

 

CONNECTOR

SENSE

DISPLAY, ANODE

 

CONNECTOR

ROD CONNECTOR

Figure 111.

PRESSURE

SWITCH

MANIFOLD

TUBE

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Contents Models ALL Technical and Warranty Questions Tools Required for servicing gas models Service HandbookBreathing Hazard Carbon Monoxide Gas Fire or Explosion HarzardTable of Contents Installation of Residential GAS Water Heater Basic Installation & OperationCarbon Monoxide Warning Combustion AIR and Vent System RequirementsReference Vent Connectors Connector must be firmly attached Electronic Control Display Upper Control Know the Water HEATER’S Component PartsGas Control Valve/Thermostat Lower Control Pressure Switch Burner/Manifold Door AssemblyAir Intake Chamber Fan HOW the Water HEATER’S Component Parts are Connected Power Anode RodSequence of Operation Water Heater OperationFILLING, Draining and Flushing the Water Heater Tank Lighting Instructions For Your Safety Read Before OperatingHotter Cooler Adjusting the Temperature on Electronic Control DisplayFault Code Diagnostics Using the Electronic Control DisplayFault Code Retrieval FV-Sense Reset Sequence Reviewing Fault CodesElectronic Control Display Electronic Control Display TroubleshootingControl Display Status Problem Solution Control Display TroubleshootingLDO-SW, OPEN, and Clean Screen YES Troubleshooting FlowchartCleaning the Air Intake Chamber Screen External Inspection and CleaningCleaning the Combustion Chamber and Air Diverter Assembly Installing the Electronic Control Display Electronic Control Display Removal / ReplacementRemoving the Electronic Control Display Removing the Powered Anode Rod Powered Anode ROD Removal / ReplacementInstalling the Powered Anode Rod Removing the Pressure Switch Pressure Switch Removal / ReplacementInstalling the Pressure Switch Removing the Transformer Transformer Removal / ReplacementInstalling the New Transformer Removing the Air Intake Chamber Box AIR Intake Chamber BOX Removal / ReplacementInstalling the Air Intake Chamber Box Installing the Fan in the Air Intake Chamber Box Pressure Wiring Harness Removal / ReplacementInstalling the New Wiring Harness Replacing the Wiring HarnessUndue Pressure or Sudden Force Removing the Fan from the Air Intake Chamber AIR Intake Chamber FAN Removal / ReplacementInstalling the Fan in the Air Intake Chamber Box Pressure Tubing Removal / Replacement Installing the Air Intake Chamber Box GAS Control Inner DOOR/MANIFOLD/BURNER Assembly Removal / ReplacementTAB Installation Caution Must Be TakenReplacing the Flame Sense/Hot Surface Igniter Assembly Flame SENSE/HOT Surface Igniter Removal / ReplacementBurner Removal / Replacement Removing Old Burner Installing New BurnerPressure Burner Orifice Removal / Replacement Removing Old Burner Orifice Installing New Burner OrificeReinstalling The Inner Door/Manifold/Burner Assembly Removing the Gas Control Valve/Thermostat GAS Control VALVE/THERMOSTAT Removal / ReplacementInstalling the Gas Control Valve/Thermostat Checking the Gas Supply Pressure Checking the GAS Supply PressureLeakage Checkpoints GAS Water Heater Sizing GuideFormulas and Conversions General InformationMM millimeters =Inches X