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Lochinvar & A.O. Smith VAL3403 Gas Valve Assembly VR8303M4897 100172016

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Special Price $252.44 Regular Price $280.21
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SKU
VAL3403
The Lochinvar & A.O. Smith VAL3403 Gas Valve Assembly is a high-quality replacement part that will give safe and efficient control of the gas to the burner of HVAC systems. This valve is designed to fit select Lochinvar and A.O. Smith water heaters and boilers and enhances system efficiency and durability. It is accurately controlled to increase energy conservation, decrease the use of gas, and increase safety as it eliminates gas emission. Perfect for keeping heating smooth, this gas valve assembly is crucial for keeping equipment efficient and consistent in their performance.
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HVAC Controls & Electrical, Valves
Manufacturer:
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Specifications

  • Type: Gas Valve Assembly

    Product Overview:
    Serving as a primary gas-flow control component, the Lochinvar & A.O. Smith VAL3403 3/4" Gas Valve Assembly VR8303M4897 100172016 manages the natural gas supply within the appliance gas train and directs fuel toward the burner assembly in heating equipment. The integrated assembly connects the incoming gas supply with the burner circuit and coordinates fuel passage within the heating system. Its valve and manifold arrangement provides the controlled pathway required for burner fuel delivery while interfacing with the equipment's gas-control system.

    Actuation and Pressure Control:
    Electrical actuation controls the opening and closing of the fuel passage in response to the equipment control signal. When energized during an active call for heat, the 24 VAC valve operator actuates to permit regulated natural gas passage from the supply line through the 3/4" connection into the burner manifold. An internal pressure regulator maintains a factory setting of 3.5" WC manifold pressure to align gas delivery with system requirements.”

    Ignition and Fuel Shutoff:
    Within the equipment operating cycle, the gas valve assembly works with the appliance ignition and safety controls to manage fuel delivery. When the control circuit initiates a heating cycle, the valve permits natural gas passage to the main burner array. When the operating signal is removed, the valve closes to stop gas flow to the burner, supporting essential fuel shutoff functions.

    Replacement Guidelines:
    Replacement of the Lochinvar & A.O. Smith 100172016 gas valve assembly may be appropriate when the valve fails to open, fails to close properly, leaks gas, or fails to maintain expected operation under load. Conditions indicating replacement include an inability to ignite the main burner despite active ignition signals, abnormal flame behavior, and physical damage to the valve housing. Replacing a compromised gas valve helps restore proper gas-flow control and fuel shutoff operation.

    Common Failure Symptoms:

    • Main burner fails to ignite during a call for heat despite active ignition attempts.
    • Heating equipment fails to reach target temperatures due to restricted gas flow.
    • System shuts down unexpectedly during operation with error codes related to gas delivery.
    • Main burner continues receiving gas after the heating demand ends.
    • Gas odor detected near the gas valve assembly, burner compartment.

    Equipment Compatibility:
    The Lochinvar & A.O. Smith VAL3403 3/4" Gas Valve Assembly VR8303M4897 100172016 is designed specifically for natural gas heating systems requiring these exact cross-reference part numbers. Confirm compatibility by matching the equipment model number, serial number, existing gas valve part number, and natural gas fuel type with the applicable manufacturer documentation before selection.

    Technical Specifications:
    Brand: Lochinvar & A.O. Smith
    Part Number: 100172016
    Product Type: Valve
    Gas Type: Natural Gas
    Connection Size: 3/4"
    Gas Pressure: 3.5" WC
    Voltage: 24V
    Model: VR8303M4897 100172016

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    Product Questions (7)
    Customer Questions
    What maintenance is required for the Lochinvar & A.O. Smith VAL3403 Gas Valve Assembly?

    Regularly inspect the gas valve assembly for leaks, corrosion, or debris. Clean connections and ensure proper mounting. Test operation to verify correct gas flow. Always turn off the gas supply and follow safety precautions before servicing.

    What are common issues with the Lochinvar & A.O. Smith VAL3403 Gas Valve Assembly?

    • Gas not flowing or valve failing to open.
    • Leaks at connections or seals.
    • Sticking or unresponsive valve components.
    • Intermittent operation or pressure inconsistencies.

    What type of gas valve assembly is the Lochinvar & A.O. Smith VAL3403?

    The Lochinvar & A.O. Smith VAL3403 is a natural gas valve assembly specified with a 24 VAC operating voltage, 3/4-inch connection size, and 3.5-inch WC pressure regulation.

    What do VAL3403, VR8303M4897, and 100172016 identify on this gas valve assembly?

    VAL3403, VR8303M4897, and 100172016 are the identifying part and model numbers associated with the Lochinvar & A.O. Smith gas valve assembly.

    What voltage does the Lochinvar & A.O. Smith VAL3403 gas valve assembly use?

    The Lochinvar & A.O. Smith VAL3403 gas valve assembly is specified for 24 VAC operation, with the valve operator responding to the equipment control signal during the heating cycle.

    What is the pressure regulation specification of the Lochinvar & A.O. Smith VAL3403?

    The Lochinvar & A.O. Smith VAL3403 gas valve assembly has a specified manifold pressure setting of 3.5" WC for natural gas operation.

    What connection size does the Lochinvar & A.O. Smith VAL3403 gas valve assembly use?

    The Lochinvar & A.O. Smith VAL3403 gas valve assembly uses a 3/4" connection for the gas passage between the supply line and burner manifold.

    Installation Steps

    Step1: Turn off gas supply and power to the unit.

    Step2: Disconnect existing gas lines and remove the old valve assembly.

    Step3: Take note of wire connections before disconnecting them.

    Step4: Mount the new valve securely in place.

    Step5: Reconnect gas lines and wiring to the corresponding terminals.

    Step6: Check all connections for leaks using a gas leak detector.

    Step7: Restore power and gas supply, then test the system for proper operation.