Free cooling tower annual service procedure
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Free cooling tower annual service procedure (PDF-ready). Fill media replacement, fan overhaul, gearbox oil and Legionella risk assessment.
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See the first part of the cooling tower annual service procedure below. Download the full version above.
What is a cooling tower annual service procedure?
A cooling tower annual service is a comprehensive preventive maintenance event that includes all quarterly service tasks plus additional annual items. It is the highest tier of scheduled maintenance and addresses structural integrity, major component overhaul, sensor calibration and full regulatory compliance. The annual service adds fill media replacement assessment (where scaling or biological fouling is beyond cleaning), a full fan motor service (bearings, insulation resistance test/megger, vibration analysis), gearbox oil change for gear-driven fans, structural steel corrosion inspection, basin re-coating, nozzle replacement, water treatment sensor calibration, full Legionella risk assessment per AS/NZS 3666, and a compliance report documenting all findings. It takes approximately 6 to 10 hours depending on tower size and condition.
From an operational and regulatory standpoint, the annual service is the most critical maintenance event in a cooling tower's calendar. In Australia, cooling towers must be registered with the relevant state or territory health authority, and operators are required to maintain them in accordance with AS/NZS 3666.2 to minimise the risk of Legionella proliferation. The annual service provides the documented evidence trail that regulators and insurers review during compliance audits. Neglecting the annual overhaul increases the risk of structural failure from undetected corrosion, energy waste from degraded fill media and fan inefficiency, and public health incidents from inadequate Legionella control. Building owners who defer this service expose themselves to enforcement action, insurance claim rejection and reputational damage if an outbreak is traced back to their facility.
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Benefits of using this cooling tower annual service procedure
- Full regulatory compliance: the annual Legionella risk assessment per AS/NZS 3666 ensures your cooling tower meets public health requirements and generates documentation for audits.
- Structural integrity: annual corrosion inspection and steel thickness measurement catches degradation before it becomes a safety risk or requires emergency repair.
- Major component longevity: fan motor overhaul, gearbox oil change and bearing replacement during the annual service extends the life of the most expensive mechanical components.
- Accurate monitoring: calibrating water treatment sensors (conductivity, pH, ORP) ensures chemical dosing is correct, preventing both under-treatment and chemical waste.
- Basin protection: re-coating the basin with epoxy or protective coating prevents corrosion and leaks, extending the life of the tower structure.
- Complete documentation: the compliance report generated at the annual service provides a full record of tower condition, test results and any remediation actions.
Benefits of digitising forms in MapTrack
When you digitise cooling tower 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).
- Trigger work orders automatically when a fault is logged during an inspection.
- Track service intervals by hours, kilometres or calendar date in one place.
- Attach supplier invoices and parts receipts to each maintenance record.
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What to include in a cooling tower annual service procedure
This cooling tower annual service procedure covers 5 key areas:
- Fill media and structure: replace fill media sections if degraded, inspect structural steel for corrosion, re-coat basin, inspect louvres and intake screens.
- Fan and motor: full fan motor service (bearings, insulation resistance/megger, vibration analysis), gearbox oil change.
- Water treatment and distribution: replace worn nozzles, calibrate water treatment controllers and sensors, service make-up water valve assembly.
- Compliance and Legionella: full Legionella risk assessment per AS/NZS 3666, compliance report documenting all findings and test results.
- Mechanical: inspect vibration isolators and mounting bolts, check basin heater (if fitted).
How to use this cooling tower annual service procedure
- Complete the quarterly service procedure first. The annual service carries forward all quarterly tasks.: Sign off the quarterly checklist including fill media inspection, water treatment checks, fan motor and bearing inspection, drift eliminator check and Legionella risk management items before starting the annual-specific tasks.
- Isolate the cooling tower and prepare for extended maintenance. The annual service typically takes 6 to 10 hours.: Shut down the condenser water pumps and isolate the fan motor electrically. Drain the basin if basin re-coating or internal structural work is required. Apply lockout/tagout to the fan motor isolator, pump isolator and chemical dosing system. Notify building management of the planned outage.
- Assess fill media condition: replace sections where scaling or biological fouling is beyond cleaning. Inspect structural steel and measure steel thickness if corrosion is a concern.: Remove sample fill media sheets and inspect for scaling, algae, biofilm and physical deterioration (sagging, crumbling). If fouling cannot be removed by cleaning, schedule fill media replacement. Use an ultrasonic thickness gauge to measure structural steel members at corrosion-prone locations.
- Perform the full fan motor service: check bearings, run insulation resistance test (megger), conduct vibration analysis. Change gearbox oil on gear-driven fans.: Use a 500 V or 1000 V megger to test motor winding insulation resistance. Record vibration levels at the motor and gearbox bearings using a portable vibration analyser. Drain the gearbox and refill with the correct grade (typically EP 220 or EP 320) to the sight glass level.
- Clean and re-coat the basin with epoxy or protective coating. Replace worn distribution nozzles.: Remove all debris, sludge and loose material from the basin. Prepare the surface by wire brushing or abrasive blasting as required. Apply the specified epoxy or polyurethane coating system and allow to cure per the product data sheet. Replace distribution nozzles that are cracked, clogged or producing uneven spray.
- Calibrate all water treatment controllers and sensors (conductivity, pH, ORP). Service the make-up water valve assembly.: Clean each sensor probe and calibrate against known buffer solutions (pH 4, 7 and 10 for pH sensors). Verify conductivity readings against a lab-calibrated reference meter. Check the make-up water float valve for correct operation and replace the seat washer if leaking.
- Conduct the full Legionella risk assessment per AS/NZS 3666. Document all findings, test results and any remediation actions in the compliance report.: Assess all risk factors including water temperature, stagnant zones, aerosol generation, water treatment effectiveness and system cleanliness. Collect water samples for Legionella laboratory analysis. Document the assessment findings, water test results, any corrective actions taken and the date of the next review in a formal compliance report.
- Inspect louvres, intake screens, vibration isolators and basin heater (if fitted). Set the next service due dates and sign off.: Check louvres for damage, algae growth or blockage. Inspect intake screens and remove accumulated debris. Check vibration isolator pads for compression or cracking. Verify the basin heater thermostat operates correctly if fitted (for freeze protection). Set the next quarterly and annual service due dates and obtain sign-off.
In MapTrack, you can schedule and track maintenance digitally. Each submission is stored as a timestamped PDF against the asset record.
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Back to download formHow often should you complete this service procedure?
Cooling towers require quarterly preventive maintenance for operational checks and an annual service for the comprehensive overhaul including fill media assessment, fan motor overhaul, gearbox oil change, structural inspection, sensor calibration and the full Legionella risk assessment per AS/NZS 3666.
The annual service should be scheduled during the cooler months when cooling demand is lowest, allowing for extended tower downtime without affecting building comfort. Water treatment monitoring (chemical dosing, conductivity, Legionella sampling) may be required more frequently than quarterly depending on your water treatment plan and state or territory public health regulations. In warmer climates where cooling towers operate year-round, plan the annual service for the period of lowest load.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS/NZS 3666.2:2011 - Air-handling and Water Systems of Buildings, Part 2: Operation and Maintenance (cooling tower maintenance and Legionella risk management)
- AS/NZS 3666.3:2011 - Air-handling and Water Systems of Buildings, Part 3: Performance-based Maintenance (risk-based maintenance planning)
- Public Health Act and Regulations (state/territory-specific requirements for cooling tower registration, maintenance and Legionella testing)
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