Modine 5H0780340005 Pressure Switch

For field technicians and mechanical contractors, the Modine 5H0780340005 Pressure Switch is the essential OEM replacement part for maintaining the sequence of operation in natural gas HVAC units. This high-precision air pressure sensing switch is a direct replacement for 5H78034-5, engineered to integrate seamlessly with Modine unit heaters and power-vented systems. Operating on a 24 VAC power supply, it features an SPDT contact configuration that ensures the inducer motor has established a proper vacuum before allowing the ignition control to energize the gas valve. By accurately monitoring draft pressure, this switch prevents hazardous conditions such as flue blockages or combustion failures. Built for the rigors of commercial and industrial environments, the Modine 5H0780340005 provides the reliable set-point accuracy required to clear 1-flash fault codes and restore consistent heating performance without the need for field modifications or bracket adjustments.

• Precise Draft Verification: Confirms proper exhaust venting to allow safe gas valve initiation.
• Universal Modine Compatibility: Direct replacement for obsolete part number 5H78034-5 in TLP and Hot Dawg series.
• Industrial-Grade Reliability: Designed with a rugged diaphragm to withstand high-cycle operations in commercial gas-fired appliances.
• Simplified Installation: Standard SPDT terminals and 24V compatibility for fast field swaps during service calls.

What does it mean if my Modine heater shows a 1-flash or 2-flash code?
A 1-flash code typically indicates the pressure switch failed to close after the inducer energized, while a 2-flash code suggests the switch is stuck closed. In both cases, verifying the 5H0780340005 functionality and vent integrity is the primary troubleshooting step.

Is this switch compatible with propane (LP) units?
This specific model is calibrated for natural gas pressure switch applications. Always verify your manifold pressure and specific unit requirements before replacing sensors in LP-converted systems.

Can I use a generic air pressure switch instead of the OEM Modine part?
Using the genuine Modine 5H0780340005 ensures the set-points match the manufacturer's safety specifications, maintaining the factory safety listings and equipment longevity.

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.