Free ahu annual service procedure
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Free AHU annual service procedure (PDF-ready). Covers motor overhaul, coils, bearings, VFD inspection, controls calibration and performance test.
Commercial Director
Updated 2 May 2026
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What is a ahu annual service procedure?
An AHU annual service is a comprehensive preventive maintenance procedure performed once per year on air handling units. MapTrack helps HVAC teams manage annual services with digital work orders that capture every reading and photo against the asset record. The annual service includes all quarterly service tasks plus deeper inspections such as motor insulation resistance testing, full coil cleaning, bearing replacement assessment, VFD checks and sensor calibration. It is the most thorough service event in the AHU maintenance calendar and provides the data needed for long-term capital planning and budgeting.
Annual AHU servicing is a critical compliance requirement under AS/NZS 1668.2 (Mechanical ventilation for acceptable indoor air quality) and state-based WHS regulations. Building owners and facility managers rely on the annual service to confirm that each unit is performing to its original design specifications, including airflow rates, temperature differentials and energy consumption benchmarks. AS/NZS 3666 requires that air-handling systems be maintained to control microbial growth including Legionella, and the annual deep clean of coils, drain pans and condensate systems directly addresses this obligation. A thorough annual service identifies wear items approaching end of life, allows planned replacement during scheduled shutdowns, and provides documented evidence that the building HVAC system is safe and performing correctly for compliance audits and insurer reviews. Skipping or deferring the annual service increases the risk of unplanned breakdowns, elevated energy consumption and regulatory non-compliance that can result in enforcement notices or building closure orders.
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Benefits of using this ahu annual service procedure
- Comprehensive coverage: the annual service addresses every component including items not checked quarterly such as motor windings and VFD parameters
- Planned replacements: identifying worn bearings belts and sensors during the annual service allows procurement and scheduling before failure
- Energy performance: coil deep cleaning motor testing and controls calibration restore the AHU to design efficiency
- Compliance evidence: a signed annual service report demonstrates due diligence under the WHS Act and BCA requirements
- Reduced emergency callouts: thorough annual inspections catch developing faults before they cause unplanned downtime
- Asset life extension: proactive replacement of wear items such as bearings and belts extends overall AHU service life by years
Benefits of digitising forms in MapTrack
When you digitise ahu service procedures in MapTrack, you get:
- Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
- Automatically get alerts when faults are identified.
- Link every form digitally as a PDF to the relevant asset, location or person.
- Receive a digital PDF copy with every submission to your email.
- Ability to share forms digitally.
- Build conditional logic (show or hide questions based on answers).
- Take pictures or attach photos. Not possible with a paper-based form.
- Electronic signatures.
- Edit forms later without reprinting.
- Restrict permissions (who can view, complete or approve).
- Build forms with AI (describe what you need and MapTrack suggests the form).
- Log refrigerant charge weights and leak-check results against each unit.
- Schedule seasonal changeover inspections tied to heating and cooling cycles.
- Track filter, belt and coil replacement intervals per system.
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What to include in a ahu annual service procedure
This ahu annual service procedure covers 8 key areas:
- All quarterly checks: complete the standard quarterly filter fan coil damper and controls inspection first
- Motor insulation resistance: megger test the motor windings and record insulation resistance values in megaohms
- Bearing assessment: measure bearing vibration velocity and evaluate whether replacement is due at the next service
- Full coil cleaning: chemically clean heating and cooling coils to remove accumulated fouling and restore heat transfer
- VFD inspection: check VFD parameters fault log cooling fan and capacitor condition where fitted
- Sensor calibration: calibrate all temperature humidity and pressure sensors against certified reference instruments
- Condensate system: flush drain pan treat with biocide and verify drain trap seal
- Cabinet and insulation: inspect all panel seals access door gaskets and internal insulation for damage or deterioration
How to use this ahu annual service procedure
- Complete quarterly service first: perform all standard quarterly checks including filters, fan assembly, coils, dampers and controls before starting annual-only tasks to establish a complete baseline for the deeper inspection
- Perform motor insulation test: disconnect motor leads and perform a megger test at 500V DC, then record insulation resistance in megaohms and compare to previous year results to identify any winding deterioration trend
- Assess bearings: measure vibration velocity on all fan and motor bearings using a calibrated vibration meter and compare readings against ISO 10816 thresholds to determine whether replacement is needed before the next service
- Deep clean coils: apply approved chemical coil cleaner to both heating and cooling coils, allow the recommended dwell time, then rinse thoroughly and verify that condensate drainage is flowing freely
- Inspect VFD: review VFD fault history and error codes, check cooling fan operation, inspect DC bus capacitors for swelling or leaking, and verify all drive parameters match the original commissioning values
- Calibrate sensors: compare each temperature, humidity and pressure sensor reading to a certified reference instrument and adjust calibration offsets or flag the sensor for replacement if deviation exceeds tolerance
- Document and plan: record all readings, test results and findings in the service report, compile a prioritised list of recommended corrective actions with cost estimates, and set the next annual service date
In MapTrack, you can track hvac maintenance and service schedules. Each submission is stored as a timestamped PDF against the asset record.
Get the free templateEnter your email above to download the full ahu annual service procedure as a PDF.Back to download formHow often should you complete this service procedure?
Annual AHU services should be performed once per year typically during a planned building shutdown or low-occupancy period. The annual service builds on top of quarterly servicing so the AHU should receive four services per year in total with the annual service replacing one of the quarterly services.
The Australian WHS Act requires a PCBU to maintain plant so it remains safe for use. AS/NZS 1668.2 provides guidance on ventilation system maintenance frequencies. For critical environments such as hospitals operating theatres and clean rooms manufacturers may recommend six-monthly deep services in addition to the standard quarterly and annual schedule.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS/NZS 1668.2 - Mechanical ventilation for acceptable indoor air quality
- National Construction Code (NCC) - BCA Volume 1 Part F4
- AS/NZS 3666 - Air-handling and water systems (Legionella)
- ASHRAE Guideline 4 - Preparation of operating and maintenance documentation
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