Mike Smith

HVAC Tech Tip: Stop Killing Compressors with Liquid

Scroll compressors were once marketed as capable of handling small amounts of liquid refrigerant. That claim is completely outdated. Any liquid in the suction line is drawn directly into the scroll plates at startup and can shatter them instantly.

If a compressor makes a loud noise and suddenly stops pumping, liquid slugging in the suction line is likely the primary cause. The fix is simple and prevents costly failures: always use a liquid charging adapter when charging R-410A instead of feeding liquid directly into the suction line.

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HVAC Tech Tip: How to Properly Wire an RDS Unit

Proper wiring of a Remote Duct Sensor (RDS) is essential for maintaining accurate system communication, optimal climate control, and efficient HVAC operation. This step-by-step guide walks you through terminal connections, low-voltage wiring safeguards, and proper sensor placement to prevent communication faults and system errors.

Whether performing a fresh installation or troubleshooting an existing setup in the field, following these industry best practices ensures reliable sensor readings and protects delicate controls from voltage spikes.

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June 2026 Tech Tip: Understanding Superheat & Subcooling

Properly measuring superheat and subcooling is essential for evaluating HVAC system efficiency, diagnosing metering device issues, and ensuring correct refrigerant charge. Use this quick reference guide to master target temperature calculations, troubleshoot common cooling system performance issues, and maintain optimal air conditioning operation in the field.

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Wiring Legacy Thermostats: Tips for HVAC Technicians

Retrofitting older or legacy thermostat controls requires a clear understanding of low-voltage wiring color codes and terminal designations. Learn key best practices for identifying control wires, handling common-wire (C-wire) retrofits, and preventing transformer overloads during installation. Use this HVAC tech tip guide to streamline legacy thermostat wiring on your job sites.

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