Commercial Rooftop Units (RTU)

Packaged rooftop units: economizers, multi-stage, belt-drive blowers, 3-phase basics and rooftop preventive maintenance.

5 guides

• Economizers: How They Save Money and Why They Fail
  An economizer brings in cool outdoor air for 'free cooling' when conditions allow, cutting compressor run time. How the control logic decides, and the failures that make economizers the most-neglected part of an RTU.
• Multi-Stage Cooling and Heating on Rooftop Units
  Why light-commercial RTUs stage their cooling and heating, how the controller brings stages on and off, and how to troubleshoot when one stage works and the other doesn't.
• Packaged Rooftop Unit Anatomy and Sequence of Operation
  An orientation to the light-commercial packaged rooftop unit — what's inside the cabinet, how it differs from a residential split, and the order it runs through on a call for cooling or heating.
• Rooftop Unit Preventive Maintenance: What to Actually Check
  A practical rooftop-unit PM — the items that actually prevent breakdowns and protect capacity: filters, belts, the economizer, coils, electrical connections, and a real performance check, not just a filter swap.
• Three-Phase Basics for Light Commercial
  What changes when you move from residential single-phase to commercial three-phase power — reading the legs, why imbalance and phase loss destroy motors, and what to check on a 3-phase RTU.

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