Carrier EF34CW154 Gas Valve

The Carrier EF34CW154 Gas Valve is a direct replacement for EF34CW181, engineered as a Factory Authorized Part for high-efficiency Carrier, Bryant, and Payne furnaces. This modulating gas valve operates on a 24V ignition circuit and is designed specifically for Natural Gas applications with a preset 3.5" W.C. regulator setting. Built by White-Rodgers (Model 36J27-580), it supports Direct Spark Ignition (DSI) and Hot Surface Ignition (HSI) systems, ensuring precise fuel-to-air ratios across the heating cycle. With its 3/4" NPT inlet and outlet, this valve provides the necessary flow capacity for medium to high-BTU residential and commercial units. As a veteran-grade HVAC replacement part, it guarantees seamless integration with the existing control board for accurate 35% to 100% modulation.

• OEM Compatibility: Precision-fit for 59MN, 987M, and other high-efficiency modulating furnace series.
• Precise Modulation: Facilitates 1% increment adjustments for optimized combustion and energy efficiency.
• Robust Construction: Rated for ambient temperatures from -40°F to 175°F to withstand demanding mechanical room conditions.
• Simplified Retrofit: Standard 3/4" line size and 24-volt lead connections allow for straightforward field installation.

Is the EF34CW154 compatible with Liquid Propane (LP)?
This valve is shipped for Natural Gas at 3.5" W.C. While it is rated for up to 226,800 BTU/HR on LP, a manufacturer-approved conversion kit must be used to ensure safe manifold pressure and spring rates.

What was the original part number for this valve?
The EF34CW154 replaces the legacy EF34CW181 model. It is the current production standard for systems requiring a modulating 24V gas control.

How do I verify the modulation is functioning?
Technicians should monitor the DC voltage signal from the furnace control board and use a manometer at the 1/8" NPT pressure tap to verify manifold pressure fluctuations during high and low-fire stages.

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.