ENL404F1078 ELITE PRESSURE AND LIMIT CONTROL 5-50 PSI RANGE MERCURY FREE SPDT

ENL404F1078 ELITE Pressure and Limit Control 5–50 PSI, Mercury-Free SPDT

Take control of your boiler, oil, or heating system with the ENL404F1078 ELITE Pressure and Limit Control—precision-engineered for reliable, accurate, and long-lasting performance. This mercury-free switch delivers a 5–50 PSI range with a 6–14 PSI differential, ensuring your system operates safely and efficiently. The stainless steel diaphragm and brass pressure joint provide durable, long-term operation, while the transparent housing cover allows instant visual confirmation of the pressure setpoint. Perfect for oil, water, air, and other non-corrosive media, this ELITE control is easy to install with standard 1/4-18 NPT threading—ideal for both residential and commercial applications.

✅ Replaces Honeywell L404F1078 – Direct replacement for Honeywell, making upgrades or repairs fast and simple.

🔥 Key Features of the ENL404F1078

✅ Mercury-Free & Environmentally Safe – Protects the planet without sacrificing performance.
✅ Accurate Pressure Control – Maintains 5–50 PSI with 6–14 PSI differential for consistent system operation.
✅ Rugged & Reliable Construction – Stainless steel diaphragm and brass pressure joint for long-lasting durability.
✅ Clear Pressure Setpoint View – Transparent housing lets you instantly confirm settings.
✅ Versatile SPDT Functionality – Works with oil, water, air, and other non-corrosive media.
✅ Simple & Quick Installation – Standard 1/4-18 NPT thread allows fast, hassle-free setup.

💻 Technical Specifications

📊 ENL404F ELITE Series Quick Reference Chart

⚡ Common Issues Solved

• Boiler pressure fluctuating beyond desired limits

• Oil or water system overpressure or underpressure

• Faulty SPDT switch in heating systems

• Need for mercury-free, safe pressure control

❓ Frequently Asked Questions (FAQ)

Q1: Can this switch be used with corrosive liquids?
A: No — only suitable for oil, water, air, and other non-corrosive media.

Q2: Is the thread size customizable?
A: Standard is 1/4-18 NPT; other threads can be requested when ordering.

Q3: What is the maximum operating temperature?
A: Up to 150.8°F (66°C).

Q4: Is this switch mercury-free?
A: Yes — it is completely mercury-free and environmentally safe.

Q5: Can it be used in both residential and commercial systems?
A: Yes — suitable for medium-pressure boilers and heating systems.

Q6: How do I know if this model is right for my system?
A: Check the ENL404F ELITE Series Quick Reference Chart for pressure range, differential, and application compatibility.

Q7: How often should the switch be inspected or replaced?
A: Inspect at least once per year; replace immediately if there are signs of wear, diaphragm damage, or inconsistent pressure readings.

Q8: Can multiple switches be used in one system?
A: Yes — adding switches improves system monitoring and safety, especially for larger or more complex setups.

🛒 Shopping Tips / Buyer Guidance

✅ Confirm System Pressure – Ensure your system operates within 5–50 PSI.
✅ Check Compatibility – Use the ENL404F ELITE Series Quick Reference Chart before purchasing.
✅ Media Matters – Designed for oil, water, air, and non-corrosive liquids only.
✅ Thread Size Check – Standard 1/4-18 NPT, verify your system connection.
✅ Plan Maintenance – Inspect annually; replace if signs of wear appear.
✅ Consider Multiple Units – Extra switches improve monitoring for larger systems.
✅ Eco-Friendly Choice – Mercury-free design protects the environment.