Comprehensive winter pre-season checklist for split system HVAC units in Zone 3. Use this guide to perform major preventive maintenance across condensers, air handlers, evaporators, and controls. Tasks include coil straightening and cleaning, belt and pulley inspection, wiring and connection checks, refrigerant leak checks, thermostat calibration, safety device tests, and recording pressures and amp draws. Covers gas and electric heat, heat pump operation, VFDs, VAV and fan-powered units, pumps, make-up air units, boilers and steam traps, and unit heaters. Includes filter replacement requirements, condensate management, and fire damper testing to ensure safe, efficient, and reliable operation through winter.
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