Key Takeaways
- Silicone grease protects control boards: Apply to economizer boards and electrical connections to prevent weather-related corrosion
- Field-tested solution: Year-long experiment proved silicone grease prevents annual board replacements
- Versatile protection: Works on various HVAC tools and electrical components exposed to outdoor conditions
- Cost-effective maintenance: Simple preventive measure saves money on replacement parts and service calls
The Corrosion Problem Every Tech Faces
A few years ago, I kept running into the same frustrating issue: economizer control boards corroding from sitting in the outdoor air stream. I was changing them yearly in some cases, which wasn’t just expensive for customers—it was a reliability nightmare.
Yes, if you’re able to install the control board within the electrical cabinet, you can avoid this issue entirely. But let’s be real—room is a luxury that’s not always available in the field. That’s when I decided to experiment with a simple solution that’s now become standard practice in my toolkit.
The Silicone Grease Experiment
I coated a few boards with silicone grease around the openings and at electrical connections as an experiment. The application was simple: just a thin layer at vulnerable points where moisture and air could penetrate. When performing preventive maintenance services a year later, I noticed something remarkable—the boards with silicone grease applied had not succumbed to the changing weather patterns crossing their paths.
The experiment was a success, and it’s changed how I approach protecting electrical components in outdoor units.
Why Silicone Grease Works
Silicone grease creates a moisture-resistant barrier that doesn’t conduct electricity, making it perfect for protecting electrical connections. Unlike petroleum-based products, it won’t degrade rubber seals or plastic components commonly found in HVAC control systems. The grease maintains its protective properties across extreme temperature ranges—crucial for equipment exposed to seasonal weather changes.
Application Tips for Maximum Protection
When applying silicone grease to your tools and components:
- Clean the surface first – Remove any existing corrosion or debris
- Apply sparingly – A thin layer is all you need
- Focus on connection points – Terminal blocks, wire nuts, and board edges
- Reapply annually – During regular maintenance schedules
- Document the treatment – Note which components you’ve protected for future reference
Beyond Control Boards: Other Applications
Silicone grease isn’t just for economizer boards. I’ve successfully used it on:
- Outdoor disconnect switches
- Contactor terminals
- Pressure switch connections
- Service valve stems
- Hand tool pivot points
- Meter probe tips
Protecting your equipment from corrosion ensures reliability on every service call. Property.com’s ‘Know Before You Go‘ tool helps you prepare for jobs by providing detailed property insights before you arrive. Combined with well-maintained tools and components, you’ll deliver more efficient service that builds customer trust. Learn how Property.com helps HVAC pros stand out in competitive markets.
Real-World Results
Check out this video demonstrating real-world applications of silicone grease in HVAC service:
The Bottom Line
A small investment in silicone grease can save thousands in replacement parts and prevent those frustrating callback situations. Whether you’re protecting complex BMS network components or simple electrical connections, this preventive measure pays for itself many times over.
Check out my YouTube channel for more tips, tricks, and troubleshooting videos, and catch The HVAC Know It All podcast here or on your favorite podcast app.
Happy HVACing, and remember—an ounce of prevention (or in this case, a dab of silicone grease) is worth a pound of cure!
