This quarterly preventive maintenance checklist is designed for direct drive fan coil units in buildings and facilities. It outlines required tools and materials, safety and lockout procedures, and step by step inspection tasks. Technicians can check noise and vibration, clean or replace filters, renew condensate pan biocide strips, wipe exterior surfaces, and tidy the area. Guidance is included for refrigerant handling on DX systems, protecting ceiling tiles during access, and documenting results and labor hours in equipment history logs to improve HVAC reliability.
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