Mike Smith

Scroll compressors were once marketed as capable of handling small amounts of liquid refrigerant. That claim is outdated. Any liquid in the suction line is drawn directly into the scroll plates at startup and will shatter them. If a compressor "made a loud noise and doesn't pump," liquid in the suction line is likely the cause. The fix is simple: use a liquid charging adapter when charging R-410A instead of charging liquid into the suction line.

Need a copy?

📥 Download PDF 

When connecting an RDS to a non-communicating furnace with an ECM motor, the wiring sequence matters - follow these steps to get it right the first time.

Need a copy for your service truck?

📥 Download Chart PDF 

Superheat and subcool readings tell you a lot about what's happening inside a refrigerant system.

Used together, they can quickly point you toward the root cause of a problem — from low charge to a restricted metering device. Use the interactive chart below as a quick reference tool to help interpret what those readings mean in the field.

Need a copy?

📥 Download PDF 

A legacy thermostat doesn't prevent communicating equipment from doing its job. The outdoor and indoor units will still talk to each other through the RDS, and the wiring to the furnace remains the same whether you have a fully communicating system or just a communicating indoor unit paired with a legacy stat.

Need a copy for your service truck?

📥 Download Chart PDF