What is the difference between a fan coil unit and an air handling unit?

A fan coil unit is a smaller terminal device that conditions a single room apartment or zone using a finned coil supplied with chilled water or hot water from a central plant plus a small fan and filter. An air handling unit is a larger central device that conditions whole-floor or whole-building airstreams and typically includes mixing dampers multiple filter banks larger coils and a substantial supply fan. FCU servicing focuses on the condensate system control valves and individual zone comfort. AHU servicing focuses on bulk airflow filtration and ventilation rate delivery.

What Australian standards apply to fan coil unit maintenance?

AS/NZS 1668.2 covers mechanical ventilation for acceptable indoor air quality including FCU maintenance considerations. AS/NZS 3666 sets requirements for air-handling and water systems including the secondary chilled water loop and Legionella risk management. The Work Health and Safety Act 2011 requires the PCBU to maintain plant so it remains safe for workers and occupants. AS 1851 covers any fire-rated components such as fire dampers in the FCU return air path.

How often should FCU drain pans be flushed?

Drain pans should be flushed and biocide treated at every routine service typically every six months. In humid climates on the ground floor of high-rise buildings or where ceiling water damage has occurred previously a quarterly drain flush may be warranted. Stagnant condensate water in FCU drain pans is one of the most common sources of microbial growth and tenant odour complaints and a blocked drain quickly causes ceiling damage that triggers insurance claims. Record the flush and biocide treatment on the service checklist as evidence.

Do FCU technicians need a refrigerant licence?

Not for standard chilled water and hot water FCU servicing. Most commercial FCUs use a secondary water loop fed from a central chiller and the technician does not handle refrigerant directly. If the FCU is a direct expansion (DX) unit with its own refrigerant circuit then any refrigerant work requires an ARCTick licence under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989. Electrical isolation and rewiring at the FCU requires a state-issued electrical licence regardless of the water or refrigerant configuration.

Can a FCU service be split between facilities and HVAC contractor staff?

Yes. Routine filter changes drain pan flushing and visible inspection can be performed by trained in-house facilities staff under supervision with the chilled water valve testing motor amps BMS integration and any control valve replacement carried out by the HVAC contractor. Splitting the work reduces contractor cost without compromising the service standard provided both parties record their activity on the same digital checklist so the asset history is complete. MapTrack supports multi-party service contributions against a single asset record.

Free fan coil unit service checklist

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Free fan coil unit service checklist (PDF-ready). Covers chilled water valves coil condensate motor and controls for FCU maintenance in HVAC.

Jarrod Milford

Commercial Director

Updated 18 May 2026

Also see:Maintenance and work orders →Best CMMS software →MapTrack vs MaintainX →

Updated 18 May 2026

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What is a fan coil unit service checklist?

A fan coil unit service checklist is a structured maintenance form used by HVAC technicians to inspect and service ceiling-mounted vertical and horizontal fan coil units (FCUs) in commercial and multi-residential buildings. Unlike air handling unit servicing FCU maintenance focuses on the smaller chilled water and hot water terminal devices that condition individual rooms or zones with a heavy emphasis on the condensate drain system two and three-way control valves motor and EC fan operation and tenant-facing comfort delivery. The checklist guides the technician through filter inspection chilled water valve actuation coil condition drain pan hygiene fan motor amps and BMS controller integration so the unit returns to design airflow and temperature performance after every service.\n\nIn Australia FCU servicing supports compliance with AS/NZS 1668.2 (mechanical ventilation for acceptable indoor air quality) and AS/NZS 3666 (air-handling and water systems including Legionella risk in the secondary chilled water loop). The WHS Act 2011 establishes the PCBU duty to maintain plant in a safe condition and a documented FCU service trail is the evidence facility managers rely on during tenant complaints lease audits and insurer reviews. Because FCUs are typically installed in ceiling voids condensate leaks and microbial growth in drain pans are a common cause of water damage claims making documented drainage flushing and biocide treatment particularly important. MapTrack helps facilities teams manage hundreds of FCUs across a building portfolio with scheduled services mobile capture and digital records linked to each unit asset.

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Benefits of using this fan coil unit service checklist

Tenant comfort delivery: verifies each FCU is delivering design airflow and temperature so tenants in individual rooms or zones receive the comfort conditions specified in the lease
Condensate protection: documented drain pan flushing and biocide treatment prevents ceiling water damage claims that account for a large share of FCU-related insurance losses across commercial portfolios
Chilled water valve operation: confirms two and three-way valves stroke correctly isolate fully and respond to BMS commands so capacity control is restored to design intent
Indoor air hygiene: catches mould and biofilm in drain pans and coils before they aerosolise spores and bacteria into occupied spaces and trigger sick-building complaints
Energy performance: clean coils correctly tensioned belts (where fitted) and verified airflow restore the FCU to its rated capacity reducing chilled water plant load and central pump energy
Asset coverage at scale: a consistent service procedure ensures every FCU across a multi-floor or multi-building portfolio receives the same standard of care regardless of which technician attends

Benefits of digitising forms in MapTrack

When you digitise fan coil unit 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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“Doing monthly site audits in MapTrack has drastically reduced our equipment loss and downtime.”

Khalid El-Hussein

NSW Store Manager, Axis Services Group

What to include in a fan coil unit service checklist

This fan coil unit service checklist covers 10 key areas:

Asset and zone details: site level zone room or apartment number FCU asset ID make and model
Filter inspection: condition replacement or wash and refit housing seal check and pre-filter where fitted
Coil condition: visible fouling fin straightness scale or biofilm on chilled and heating coil surfaces
Condensate drainage: drain pan cleaned and flushed drain line clear condensate pump operation if fitted biocide tablet replacement
Chilled water valve: two or three-way valve strokes actuator responds to BMS demand valve fully isolates when closed
Heating valve and circuit: hot water valve operation return temperature recorded if the unit has a heating coil
Fan motor and controls: motor running amps EC fan signal response vibration noise and bearing condition
BMS integration: room thermostat or sensor accuracy setpoint achievable in all modes alarm status cleared
Air balance check: supply diffuser and return grille airflow measured if requested balance damper position recorded
Defects and sign-off: corrective actions overall result and tenant or site representative acknowledgement

How to use this fan coil unit service checklist

Plan access and isolate the unit: coordinate ceiling access with the building manager or tenant lock and tag the FCU at its local isolator confirm zero energy and isolate the chilled water flow and return valves before opening the unit
Service the filters: remove the return air filter wash with warm water and refit or install a new disposable filter then check the housing seal for bypass air that reduces filtration effectiveness and recirculates dust
Inspect the coils: visually check the chilled and heating coils for fouling fin damage scale or biofilm clean fins with low-pressure air or approved coil cleaner if needed and verify the coil is properly mounted in the drain pan
Flush the condensate system: lift the drain pan if accessible flush the drain pan and drain line confirm free flow at the discharge point replace any biocide tablet and test the condensate pump if fitted by raising the float switch
Test the control valves: cycle the chilled water two or three-way valve through its full range using the BMS or actuator override confirm the actuator strokes the full distance the valve isolates fully when closed and the BMS sees the correct feedback
Verify motor and fan operation: with the unit re-energised measure motor running amps and supply voltage listen for vibration or bearing noise confirm the EC fan responds correctly to BMS speed commands and check that airflow is reaching all supply diffusers
Document and close out: record all readings the corrective actions taken any defects requiring a follow-up visit and complete the overall result as Pass Monitor or Fail with the tenant or site representative signature

In MapTrack, you can track hvac maintenance and service schedules. Each submission is stored as a timestamped PDF against the asset record.

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How often should you complete this service procedure?

Most commercial and multi-residential FCUs require a full service every six months with filter checks every three months in high-occupancy or dusty environments. Condensate drain pans should be flushed and biocide treated at every service to prevent the microbial growth and ceiling water damage that account for the majority of FCU insurance claims.\n\nAS/NZS 1668.2 sets ventilation maintenance frequencies for commercial buildings and AS/NZS 3666 requires that air-handling and water systems be maintained to control Legionella and microbial growth. The Australian WHS Act 2011 obligates the PCBU to maintain plant safely. Hospitals laboratories and data centres often run monthly filter inspections in addition to the standard six-monthly service and MapTrack scheduling can automate recurring services against every FCU asset across a portfolio.

Frequently asked questions

Applicable regulatory standards

This template aligns with the following regulations and standards:

AS/NZS 1668.2
AS/NZS 3666
AS 1851
WHS Act 2011

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