ENL404F1102 ELITE Pressure Limit Control 10–150 PSI, Mercury-Free SPDT
Take control of your boiler, oil, or heating system with the ENL404F1102 ELITE Pressure Limit Control—engineered for precision, reliability, and long-lasting performance. This mercury-free SPDT switch operates within a 10–150 PSI range with a 10–22 PSI differential, ensuring your system runs safely and efficiently. The stainless steel diaphragm and brass pressure joint provide durability, while the clear plastic housing cover allows for instant visual confirmation of the pressure setpoint. Ideal for oil, water, air, and other non-corrosive media, this ELITE control is easy to install using standard 1/4-18 NPT threading, suitable for both residential and commercial applications.
✅ Replaces Honeywell L404F1102 – Direct replacement for Honeywell, making upgrades or repairs fast and simple
🔥 Key Features of the ENL404F1102
✅ Mercury-Free & Environmentally Safe – Protects the environment while delivering reliable performance.
✅ Accurate Pressure Control – Maintains 10–150 PSI with 10–22 PSI differential for consistent operation.
✅ Durable Construction – Stainless steel diaphragm and brass pressure joint for long-term reliability.
✅ Clear Housing View – Transparent cover for instant visual monitoring of pressure.
✅ Versatile SPDT Switch – Works with oil, water, air, and other non-corrosive media.
✅ Easy Installation – Standard 1/4-18 NPT thread allows quick, hassle-free setup.
💻 Technical Specifications
| Specification | Details |
|---|
| Model |
ENL404F1102 ELITE Pressure Limit Control |
| Type |
Pressure Limit / SPDT Switch |
| Pressure Range |
10–150 PSI ✅ |
| Differential |
10–22 PSI ✅ |
| Max Diaphragm Pressure |
225 PSI ✅ |
| Max Ambient Temperature |
150.8°F (66°C) ✅ |
| Electrical Rating |
15A @ 250 VAC |
| Interface Thread |
1/4-18 NPT ✅ |
| Contact Type |
SPDT ✅ |
| Housing |
Clear Plastic Cover |
| Diaphragm Material |
Stainless Steel ✅ |
| Pressure Joint Material |
Brass ✅ |
| Media Compatibility |
Oil, water, air, other non-corrosive liquids ✅ |
| Installation Orientation |
Vertical or horizontal |
| Environment |
Indoor; -20°F to 150.8°F (-29°C to 66°C) ✅ |
| Safety & Compliance |
Mercury-free, environmentally safe ✅ |
📊 ENL404F ELITE Series Quick Reference Chart
| Feature / Spec | ENL404F1060 | ENL404F1078 | ENL404F1094 | ENL404F1102 |
|---|
| Pressure Range |
2–15 PSI |
5–50 PSI |
20–300 PSI |
10–150 PSI |
| Differential |
2–6 PSI |
6–14 PSI |
20–50 PSI |
10–22 PSI |
| Max Diaphragm Pressure |
25 PSI |
85 PSI |
350 PSI |
225 PSI |
| Max Ambient Temperature |
150.8°F (66°C) |
150.8°F (66°C) |
150.8°F (66°C) |
150.8°F (66°C) |
| Max Electrical Rating |
15A @ 250 VAC |
15A @ 250 VAC |
15A @ 250 VAC |
15A @ 250 VAC |
| Interface Thread |
1/4-18 NPT |
1/4-18 NPT |
1/4-18 NPT |
1/4-18 NPT |
| Contact Type |
SPDT |
SPDT |
SPDT |
SPDT |
| Housing |
Clear Plastic Cover |
Clear Plastic Cover |
Clear Plastic Cover |
Clear Plastic Cover |
| Typical Applications |
🔹 Low-pressure boilers, oil systems |
🔹 Medium-pressure boilers, heating systems |
🔹 Industrial & high-pressure process systems |
🔹 Higher-pressure boilers & water systems |
| Honeywell Cross Reference |
L404F1060 |
L404F1078 |
L404F1094 |
L404F1102 |
⚡ Common Issues Solved
-
Boiler or oil system pressure exceeding limits
-
Overpressure or underpressure in water or heating systems
-
Faulty SPDT switch affecting system control
-
Need for mercury-free, environmentally 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 — completely mercury-free and environmentally safe.
Q5: Can it be used in both residential and commercial systems?
A: Yes — suitable for higher-pressure boilers and water 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 readings.
Q8: Can multiple switches be used in one system?
A: Yes — extra switches enhance system monitoring and safety, especially for larger setups.
🛒 Shopping Tips / Buyer Guidance
✅ Confirm System Pressure – Ensure your system operates within 10–150 PSI.
✅ Check Compatibility – Reference the ENL404F ELITE Series Quick Reference Chart.
✅ 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.
