ac preventive maintenance checklist pdf

HVAC Preventive Maintenance Standard Operating Procedure

Document Control

• Document ID: SOP-FAC-[__________]
• Version: 1.0
• Effective Date: [__________]
• Review Cycle: Annual

1. Purpose & Scope

This procedure establishes the systematic requirements for the inspection, cleaning, and testing of HVAC assets to ensure operational longevity, energy efficiency, and indoor air quality. This applies to all [__________] units located at [Facility Name/Site ID].

2. Prerequisites

• Safety Gear: PPE (Gloves, safety glasses, non-conductive footwear).
• Tools: Multimeter, vacuum gauge, fin comb, coil cleaner, shop vacuum, soft-bristle brush, screwdriver set, adjustable wrench.
• Materials: Replacement filters (spec: [__________]), coil cleaning solution, lubricant (if applicable), rags.
• Documentation: Access to unit schematics, previous maintenance logs, and lockout/tagout (LOTO) kits.

3. Roles & Responsibilities

4. Step-by-Step Procedure

Phase 1: Preparation & Safety

• Verify LOTO protocols are in place and power is disconnected.
• Clear a 3-foot radius around the unit for safe access.
• Inspect the physical integrity of the unit housing for signs of corrosion or structural damage.

Phase 2: Internal Inspection & Cleaning

• Remove access panels and vacuum the interior cabinet to remove debris.
• Replace air filters with [Part Number/Model] units.
• Inspect evaporator and condenser coils; apply cleaning solution if debris is present.
• Straighten bent fins using a fin comb to ensure proper airflow.
• Clear the condensate drain line; verify flow and check for algae buildup.

Phase 3: Electrical & Mechanical Testing

• Inspect all electrical connections for signs of arcing or overheating; tighten loose terminals.
• Measure voltage and amperage on the compressor and fan motors; record values: [__________].
• Check capacitor ratings; replace if values are +/- 10% outside of manufacturer specifications.
• Lubricate motor bearings if the unit is not permanently sealed.

Phase 4: System Verification

• Restore power and engage the system.
• Verify thermostat setpoint accuracy and unit response.
• Measure temperature differential (Delta T) across the coil: [__________] °F.
• Finalize documentation and sign off on the maintenance log.

5. Quality Assurance & Pro-Tips

• Pro-Tip: Always document the "Before" and "After" amperage readings. A gradual increase in amperage over time is a leading indicator of motor failure.
• Common Pitfall: Over-tightening electrical connections can strip terminals. Use a calibrated torque screwdriver when possible.
• QA Check: Ensure all access panels are secured and gaskets are intact to prevent air leaks, which significantly degrade efficiency.

6. FAQs

Q: How often should this maintenance be performed? A: For standard commercial environments, this procedure should be executed at least semi-annually (pre-cooling and pre-heating seasons).

Q: What if the system shows abnormal pressure readings? A: If refrigerant pressures fall outside the manufacturer's specified range, cease operation and contact a certified HVAC technician to check for leaks or charge imbalances.