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Run: Makeup Air Unit Seasonal Service Report

Seasonal service report for makeup air units that documents burner condition, gas pressure, airflow, exhaust balance, and freeze stat performance. Use it to ...

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Inspection Setup and Unit Identification

Record the MAU asset tag, location, and unit nameplate information.
Access panels, roof access, and work area are clear for safe inspection.
Verify equipment is isolated and secured per site LOTO procedure before opening panels or touching internal components.
Document who performed the service and when it was completed.
Confirm appropriate PPE was worn for the task, such as gloves, eye protection, and fall protection if applicable.

Burner and Combustion Components

Check burners for corrosion, soot buildup, distortion, loose mounting, or signs of flame impingement.
Verify igniter, pilot components, and flame-sensing parts are properly mounted and not visibly damaged.
Confirm combustion air intake paths are clear and not blocked by debris, ice, or nesting material.
Inspect venting path for visible blockage, deterioration, or disconnected sections.
Document whether dust, debris, or residue was removed from the burner compartment during service.

Gas Pressure and Fuel Train

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

Airflow and Exhaust Balance

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

Controls and Freeze Stat Function Test

Simulate or verify freeze stat operation per site procedure and document the response.
Confirm the freeze stat initiates the intended safety response and resets correctly after test.
Check the unit controller for active alarms, fault codes, or abnormal indications.
Verify applicable safeties such as high limit, airflow proving, and interlocks operate as intended.

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