Free hvac chiller annual service procedure
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Free HVAC chiller annual service checklist (PDF-ready). Leak test, oil analysis, tube testing, sensor calibration and performance test. Download free.
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See the first part of the hvac chiller annual service procedure below. Download the full version above.
What is a hvac chiller annual service procedure?
An annual chiller service is the most comprehensive level of scheduled preventive maintenance for water-cooled and air-cooled chiller systems. It includes all quarterly service tasks plus additional items that are only practical or necessary once per year: a full refrigerant leak test using an electronic detector on every joint and fitting, compressor oil analysis (sent to a laboratory for acid, moisture and metal content testing), eddy current testing on condenser and evaporator tubes (water-cooled units), evaporator tube cleaning, calibration of all temperature sensors, pressure transducers and the chilled water flow meter, VFD inspection (if fitted), electrical insulation resistance testing on compressor motor windings (megger test), a full chiller performance test measuring COP or EER at design conditions, exercising all isolation valves, and updating the refrigerant register or F-gas log. The annual service typically requires the chiller to be shut down for several hours.
In Australia, HVAC chillers are subject to several overlapping regulatory frameworks. Refrigerant handling must comply with the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989, which requires that only licensed technicians handle refrigerant and that all additions, recoveries and leak repairs are recorded. Chillers containing more than 10 kg of refrigerant must have an annual leak check. Under WHS Regulations 2011, the chiller is classified as plant that must be maintained to prevent risks to health and safety.
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Benefits of using this hvac chiller annual service procedure
- Prevent compressor failure: oil analysis and insulation resistance testing detect early signs of internal degradation before catastrophic failure occurs.
- Maintain design efficiency: calibrating sensors, testing performance at design conditions and cleaning heat exchangers ensures the chiller operates at its rated COP/EER.
- Extend equipment life: comprehensive annual servicing can extend the life of a chiller from 15-20 years to 25+ years, deferring major capital expenditure.
- Regulatory compliance: refrigerant leak testing, register updates and documented service records meet environmental legislation requirements for fluorinated greenhouse gases.
- Reduce energy costs: chillers are often the single largest energy consumer in a building. Even small efficiency gains translate to significant cost savings over a year.
- Avoid emergency cooling hire: an unplanned chiller failure in summer can require temporary cooling at thousands of dollars per day. Preventive servicing avoids this.
Benefits of digitising forms in MapTrack
When you digitise hvac chiller 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 hvac chiller annual service procedure
This hvac chiller annual service procedure covers 7 key areas:
- Refrigerant system: full leak test with electronic detector, update refrigerant register / F-gas log, verify safety data sheets on site.
- Compressor: oil analysis (send sample for acid, moisture, metal content).
- Heat exchangers: eddy current test on condenser and evaporator tubes (water-cooled), clean evaporator tubes.
- Instrumentation: calibrate all temperature sensors, pressure transducers and chilled water flow meter.
- Variable speed drive: inspect VFD (fan, amps, fault log) if fitted.
- Electrical: insulation resistance test (megger on compressor motor windings).
- Performance: full chiller performance test (COP/EER at design conditions), exercise all isolation valves.
How to use this hvac chiller annual service procedure
- Complete all quarterly service tasks first. Refer to the quarterly service procedure for the full checklist.: Work through every item on the quarterly service checklist including refrigerant pressures, compressor inspection, condenser cleaning, evaporator approach temperature, safety control testing and operating data logging before beginning the annual-only tasks.
- Perform a full refrigerant leak test using an electronic detector on all joints, fittings and service connections. Record any leaks found and repair before proceeding.: Use a calibrated electronic refrigerant detector (sensitivity of at least 5 g/year) and methodically scan every brazed joint, flare fitting, valve stem, service connection and Schrader cap. Record the location and severity of any leaks found and repair them before proceeding with the remaining annual tasks.
- Take a compressor oil sample and send to a laboratory for acid, moisture and metal content analysis. Record the sample details.: Draw a sample from the compressor oil drain or sampling port into a clean, sealed bottle. Label with chiller ID, date and operating hours. Send to an accredited oil analysis laboratory for acid number, moisture content and spectrometric metal analysis. Results will indicate internal wear trends and refrigerant breakdown.
- For water-cooled units, perform eddy current testing on condenser and evaporator tubes (if due per schedule). Clean evaporator tubes.: Engage a qualified NDT technician to insert an eddy current probe through each tube, measuring wall thickness and detecting pitting, erosion or scaling. Record results per tube and flag any tubes approaching minimum wall thickness. Clean evaporator tubes using a mechanical brush or chemical flush to restore heat transfer efficiency.
- Calibrate all temperature sensors, pressure transducers and the chilled water flow meter against reference instruments.: Compare each sensor reading to a NATA-traceable reference instrument. Adjust or replace any sensor reading outside the manufacturer specified tolerance, typically plus or minus 0.5 degrees Celsius for temperature sensors and plus or minus 1 percent for pressure transducers. Record all calibration results.
- Inspect the VFD / variable speed drive (if fitted): check fan, amps and review the fault log.: Open the VFD enclosure, inspect the cooling fan for dust buildup and confirm it spins freely. Check input and output amperage against nameplate. Download or review the fault log for any recurring error codes, overcurrent events or thermal faults since the last annual service.
- Perform an electrical insulation resistance test (megger) on the compressor motor windings. Record megaohm readings.: Isolate the motor from the drive and apply a 500 V or 1,000 V megger test to each winding phase to ground. Record the megaohm reading and compare to the manufacturer minimum, typically above 100 megaohms at operating temperature. Declining readings over successive annual tests indicate insulation degradation.
- Run a full chiller performance test: measure COP or EER at design conditions and compare to the manufacturer's rated performance.: Operate the chiller at full load design conditions and record chilled water supply and return temperatures, condenser water temperatures, flow rates and power input. Calculate the COP or EER and compare to the nameplate rating. A drop of more than 10 percent from rated performance indicates the need for further investigation.
- Exercise all isolation valves. Update the refrigerant register or F-gas log. Verify safety data sheets are available on site.: Cycle every isolation valve from fully closed to fully open and back to confirm smooth operation and no seizure. Update the refrigerant register with the current charge weight, any additions or recoveries. Confirm that safety data sheets for the refrigerant type are available and current on site.
- Record any defects or recommendations in the notes section. Set the next quarterly and annual service due dates. Sign off and update the asset's maintenance log.: Document all findings, measurements and any recommended corrective actions. Set the next quarterly and annual service due dates in your maintenance management system. Obtain the technician and facility manager signatures before closing out the service record.
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?
The annual chiller service should be performed once every 12 months. It builds on the quarterly service, which should be performed every three months. The annual service includes all quarterly tasks plus refrigerant leak testing, compressor oil analysis, eddy current tube testing (water-cooled), sensor calibration, insulation resistance testing and a full performance test. Critical chillers in hospitals, data centres or continuous-process facilities may require more frequent performance benchmarking. Always follow the manufacturer service schedule and adjust for operating conditions, water quality and refrigerant type.
For critical cooling applications such as data centres, hospitals and pharmaceutical manufacturing, the annual service should be supplemented with monthly performance checks and quarterly oil analysis. In MapTrack, you can configure calendar-based and condition-based maintenance triggers for each chiller, with automatic reminders and compliance dashboards that flag overdue inspections.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS/NZS 1677 Refrigerating systems
- ASHRAE chiller performance standards
- Ozone Protection and Synthetic Greenhouse Gas Management Act (ARCTick licensing)
- WHS Regulations 2011, Chapter 5 - Plant and Structures
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