Lochinvar & A.O. Smith 100077876 Valve
The Lochinvar & A.O. Smith 100077876 Valve is a 3/4" x 3/4" NPT combination control designed for high-efficiency commercial and residential water heaters and boilers. This slow-open gas valve is engineered to prevent rapid pressure fluctuations, ensuring a smooth, controlled ignition sequence that stabilizes the combustion process and protects the heat exchanger from thermal shock. It is factory-configured for Natural Gas (NAT) but includes the necessary internal components for a Liquid Propane (LP) conversion, providing versatile fuel compatibility for varied job site requirements. As an OEM replacement for part numbers 100077876 and 3210571, this Honeywell VR8304H 4206 equivalent offers reliable 24V solenoid operation. For technicians troubleshooting ignition failure or flame loss, this valve features a durable die-cast body and integral manual shut-off, making it a critical component for maintaining consistent gas manifold pressure and optimal manifold delivery in A.O. Smith and Lochinvar systems.
Key Benefits- Slow-Opening Sequence: Reduces "hard starts" by allowing a gradual increase in gas flow for quieter, safer burner ignition.
- Dual Fuel Versatility: Seamlessly transitions between Natural Gas and LP applications with the included regulator adjustment capabilities.
- OEM Compatibility: Exact fit for A.O. Smith and Lochinvar equipment, ensuring proper alignment with 3/4-inch gas lines and existing wiring harnesses.
- Enhanced Safety: Built-in automatic gas shut-off and pressure regulation maintain precise fuel delivery to prevent over-firing.
Can I use this 100077876 valve on a negative pressure boiler system?
While this valve is standard for many atmospheric and power-vented units, always verify your specific boiler’s manifold requirements. Use a manometer to confirm if your system requires a negative pressure regulator or a standard positive pressure valve like this one.
How do I convert this valve from Natural Gas to LP?
This 3/4x3/4" gas valve includes the necessary springs or regulator settings for conversion. Ensure you use a calibrated manometer to set the LP manifold pressure to the manufacturer's specification found on the equipment rating plate.
Why is my boiler showing an E421 or ignition fault code?
An ignition fault often points to a failed solenoid coil or a blocked internal orifice. If you have 24V at the valve but no gas flow at the outlet, the valve likely requires replacement to restore heat.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $441.33
-65%$441.33
$154.47Lochinvar & A.O. Smith 100077876 Valve
The Lochinvar & A.O. Smith 100077876 Valve is a 3/4" x 3/4" NPT combination control designed for high-efficiency commercial and residential water heaters and boilers. This slow-open gas valve is engineered to prevent rapid pressure fluctuations, ensuring a smooth, controlled ignition sequence that stabilizes the combustion process and protects the heat exchanger from thermal shock. It is factory-configured for Natural Gas (NAT) but includes the necessary internal components for a Liquid Propane (LP) conversion, providing versatile fuel compatibility for varied job site requirements. As an OEM replacement for part numbers 100077876 and 3210571, this Honeywell VR8304H 4206 equivalent offers reliable 24V solenoid operation. For technicians troubleshooting ignition failure or flame loss, this valve features a durable die-cast body and integral manual shut-off, making it a critical component for maintaining consistent gas manifold pressure and optimal manifold delivery in A.O. Smith and Lochinvar systems.
Key Benefits- Slow-Opening Sequence: Reduces "hard starts" by allowing a gradual increase in gas flow for quieter, safer burner ignition.
- Dual Fuel Versatility: Seamlessly transitions between Natural Gas and LP applications with the included regulator adjustment capabilities.
- OEM Compatibility: Exact fit for A.O. Smith and Lochinvar equipment, ensuring proper alignment with 3/4-inch gas lines and existing wiring harnesses.
- Enhanced Safety: Built-in automatic gas shut-off and pressure regulation maintain precise fuel delivery to prevent over-firing.
Can I use this 100077876 valve on a negative pressure boiler system?
While this valve is standard for many atmospheric and power-vented units, always verify your specific boiler’s manifold requirements. Use a manometer to confirm if your system requires a negative pressure regulator or a standard positive pressure valve like this one.
How do I convert this valve from Natural Gas to LP?
This 3/4x3/4" gas valve includes the necessary springs or regulator settings for conversion. Ensure you use a calibrated manometer to set the LP manifold pressure to the manufacturer's specification found on the equipment rating plate.
Why is my boiler showing an E421 or ignition fault code?
An ignition fault often points to a failed solenoid coil or a blocked internal orifice. If you have 24V at the valve but no gas flow at the outlet, the valve likely requires replacement to restore heat.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Lochinvar & A.O. Smith 100077876 Valve is a 3/4" x 3/4" NPT combination control designed for high-efficiency commercial and residential water heaters and boilers. This slow-open gas valve is engineered to prevent rapid pressure fluctuations, ensuring a smooth, controlled ignition sequence that stabilizes the combustion process and protects the heat exchanger from thermal shock. It is factory-configured for Natural Gas (NAT) but includes the necessary internal components for a Liquid Propane (LP) conversion, providing versatile fuel compatibility for varied job site requirements. As an OEM replacement for part numbers 100077876 and 3210571, this Honeywell VR8304H 4206 equivalent offers reliable 24V solenoid operation. For technicians troubleshooting ignition failure or flame loss, this valve features a durable die-cast body and integral manual shut-off, making it a critical component for maintaining consistent gas manifold pressure and optimal manifold delivery in A.O. Smith and Lochinvar systems.
Key Benefits- Slow-Opening Sequence: Reduces "hard starts" by allowing a gradual increase in gas flow for quieter, safer burner ignition.
- Dual Fuel Versatility: Seamlessly transitions between Natural Gas and LP applications with the included regulator adjustment capabilities.
- OEM Compatibility: Exact fit for A.O. Smith and Lochinvar equipment, ensuring proper alignment with 3/4-inch gas lines and existing wiring harnesses.
- Enhanced Safety: Built-in automatic gas shut-off and pressure regulation maintain precise fuel delivery to prevent over-firing.
Can I use this 100077876 valve on a negative pressure boiler system?
While this valve is standard for many atmospheric and power-vented units, always verify your specific boiler’s manifold requirements. Use a manometer to confirm if your system requires a negative pressure regulator or a standard positive pressure valve like this one.
How do I convert this valve from Natural Gas to LP?
This 3/4x3/4" gas valve includes the necessary springs or regulator settings for conversion. Ensure you use a calibrated manometer to set the LP manifold pressure to the manufacturer's specification found on the equipment rating plate.
Why is my boiler showing an E421 or ignition fault code?
An ignition fault often points to a failed solenoid coil or a blocked internal orifice. If you have 24V at the valve but no gas flow at the outlet, the valve likely requires replacement to restore heat.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
