The safety switch is an underrated part of any automotive air conditioning system. For most switches, the purpose is simple but critical: turn the compressor off when it isn’t safe for it to run. You may have noticed that many cars’ compressors won’t engage the clutch if the refrigerant has leaked out. That’s probably because the switch has sensed low pressure and opened the circuit to prevent the compressor from running drying and causing damage.
Safety switches come in a couple of types for a couple of applications, so it’s important to understand which one is right for you. Rick Love, Vintage Air’s Executive Vice President, took the time to go through the basics in a video, saying, “Compressor safety switches are one of the most important parts of your system and they basically come in two types; you have a binary safety switch which gives you high pressure and low pressure protection and you have a trinary safety switch which gives you the same high pressure and low pressure protection plus an added engagement signal for your electric fan.”
How do you know which switch is right for you? “If you’re running an engine-driven fan, you can get by with a binary safety switch. If you’re running an electric fan as your primary cooling fan, you’re going to want to use the trinary switch,” Rick advises. Simple as that. Adding to the simplicity, Vintage Air can supply either switch, binary or trinary, along with an electric fan relay kit and all of the necessary wiring diagrams for an easy install.