Makeup Air Unit Seasonal Service Report

Seasonal inspection template for makeup air units (MAUs) to document burner condition, gas pressure, supply airflow, exhaust balance, freeze stat operation, and related maintenance findings.

Inspection Setup and Unit Identification

• Unit identification verified
  Record the MAU asset tag, location, and unit nameplate information.
• Service area accessible and free of obstructions
  Access panels, roof access, and work area are clear for safe inspection.
• Lockout-tagout applied before internal inspection
  Verify equipment is isolated and secured per site LOTO procedure before opening panels or touching internal components.
• Inspector name and service date recorded
  Document who performed the service and when it was completed.
• Required PPE used
  Confirm appropriate PPE was worn for the task, such as gloves, eye protection, and fall protection if applicable.

Burner and Combustion Components

• Burner assembly clean and free of visible damage
  Check burners for corrosion, soot buildup, distortion, loose mounting, or signs of flame impingement.
• Ignition components secure and serviceable
  Verify igniter, pilot components, and flame-sensing parts are properly mounted and not visibly damaged.
• Combustion air openings unobstructed
  Confirm combustion air intake paths are clear and not blocked by debris, ice, or nesting material.
• Flue or exhaust path visually clear
  Inspect venting path for visible blockage, deterioration, or disconnected sections.
• Burner compartment cleaned as needed
  Document whether dust, debris, or residue was removed from the burner compartment during service.

Gas Pressure and Fuel Train

• Incoming gas pressure measured
  Record the inlet gas pressure at the unit during service.
• Manifold gas pressure measured
  Record the manifold pressure and compare it to the unit nameplate or manufacturer requirements.
• Gas train fittings free of leaks
  Check accessible gas train connections, valves, and fittings for evidence of leakage using approved leak detection methods.
• Gas shutoff valve accessible and labeled
  Verify the manual shutoff valve is accessible, identified, and operable.

Airflow and Exhaust Balance

• Supply airflow measured
  Record the delivered supply airflow for the MAU.
• Supply airflow within target range
  Confirm measured supply airflow is within the project or TAB target range.
• Exhaust balance verified
  Confirm exhaust airflow is balanced relative to supply requirements and building operating conditions.
• Belts and pulleys in good condition
  Inspect belts for wear, tension, alignment, and visible cracking; verify pulleys are secure.
• Filters clean or replaced
  Document filter condition and whether filters were cleaned or replaced during service.

Controls and Freeze Stat Function Test

• Freeze stat function test completed
  Simulate or verify freeze stat operation per site procedure and document the response.
• Freeze stat trips and resets properly
  Confirm the freeze stat initiates the intended safety response and resets correctly after test.
• Control panel free of active alarms or faults
  Check the unit controller for active alarms, fault codes, or abnormal indications.
• Safety controls operational
  Verify applicable safeties such as high limit, airflow proving, and interlocks operate as intended.