Paper Is Not Proof: A Maintenance Audit for F-Gas Records
Photo: Photographer not named., Public domain, via Wikimedia Commons
Refrigeration and air-conditioning records are often treated as an administrative overhead: a folder kept for the auditor, the insurer or the contractor who inherits the plant. That framing is understandable, but it is also why gaps tend to surface at the worst possible moment. The plant team is usually the only function with enough day-to-day knowledge to tell whether a record is merely present or actually describes what happened on site.
A record is not the same as evidence
An F-Gas record can exist in several places and still fail to answer the basic questions. A service sheet may show that a leak check was carried out. An invoice may show that refrigerant was supplied. A contractor may hold a certificate. None of those, on its own, proves that the equipment was identified correctly, that the check covered the right components, that any leak was repaired and that the register was updated afterwards.
The distinction matters because external reviews do not simply count documents. They look for a chain of evidence. If a reviewer cannot follow that chain from the equipment register to the leak check, to the repair or top-up, and back to the next due date, the record is open. A plant-led audit should be designed to find those open loops before someone else does.
Start with the equipment register
The equipment register is the foundation. If it is wrong, every downstream record inherits the error. A practical check begins with a walkdown rather than a desk review: compare the register against what is actually installed, including split systems, chillers, cold rooms, display cases and any portable or temporary units that fall within scope.
Look for the common failures. Decommissioned equipment may still be listed, which inflates the workload and obscures the plant that matters. New equipment may be missing because it was installed under a minor works order and never added. Charge sizes may have been copied from a datasheet rather than confirmed from the unit label or commissioning record. Location descriptions may be too vague to help an engineer find the asset.
Each entry should carry a unique identifier, a clear location, the refrigerant type, the charge in kilograms and the charge in tonnes of CO2 equivalent. It should also show who owns the record and when it was last reconciled. A register that is reviewed once a year and signed off is more credible than one that is edited informally and never verified.
Leak-check intervals need a calendar and a reason
Leak-check frequency is driven by the charge in tonnes of CO2 equivalent, not by the physical weight of gas alone. The common thresholds are 5, 50 and 500 tonnes CO2e, with intervals shortening as the charge rises. Where a fixed leak detection system is installed, the interval may be extended, but the record must show that the system was present and operating.
A useful audit does not simply ask whether the dates are present. It asks whether each date is supported by a method and a result. The record should identify the equipment checked, the date, the engineer or technician, the leak detection method used and the outcome. If a leak was found, the record should show the repair, the follow-up check and any change to the refrigerant charge.
Where intervals have been extended because of leak detection, the evidence should be explicit. A note saying that detection is fitted is not enough. The file should show the system type, its location, its operational status and the date it was last tested. Otherwise the extension is an assumption rather than a record.
Contractor certificates are part of the chain
Most plant teams rely on specialist contractors for refrigeration work, and that is appropriate. The audit question is not whether a contractor is trusted; it is whether the paperwork proves that the right company and the right person carried out the work. Company certification, personnel certificates and the scope of work all need to be checked against the task.
A certificate held by a subcontractor is not necessarily evidence that the individual on site was covered. The same applies to certificates that have expired or that relate to a different category of work. A simple schedule of contractors, certificate numbers, expiry dates and named personnel is enough to make this visible. It should be reviewed alongside the service records, not kept in a separate folder that nobody opens.
Where a contractor handover is approaching, this check becomes more urgent. Incoming contractors inherit the record, not the history behind it. A short handover pack that explains the register, the leak-check regime, the certificate position and any open actions is far more useful than a box of unsorted service sheets.
Top-up notes should explain, not just account
A refrigerant top-up is not a maintenance event in its own right; it is a symptom. The record should identify the refrigerant type, the quantity added, the reason for the addition and the leak check that followed. It should also show whether a repair was carried out, whether the system was monitored and whether the register was updated with the new charge.
An invoice or delivery note is not sufficient on its own. It proves that gas was supplied, not that it was needed, used correctly or followed by the required action. The audit should trace each top-up back to a leak check and forward to the next scheduled review. If that trace cannot be made, the record is incomplete.
The loop-closing test
For each record, ask four questions. What was the condition found? What action was taken? Who confirmed the action? What is the next due date? If any answer is missing, the record is open. This test is deliberately simple because it can be applied by a maintenance supervisor, a planner or an external reviewer without specialist refrigeration knowledge.
A quarterly sample audit using this test will usually reveal more than an annual scramble. The sample should cover a spread of equipment types and charge sizes, not just the largest units. The findings should be logged as actions with owners and dates, and the register should be updated as part of the same process. That is what turns F-Gas compliance from a last-minute paperwork exercise into a routine plant discipline.
A practical routine for plant teams
A workable routine has four elements. First, assign a named owner for the F-Gas register and the evidence file. Second, reconcile the register against the plant at least annually and after any significant installation or decommissioning. Third, sample leak checks, contractor certificates and top-up records each quarter using the loop-closing test. Fourth, keep a single controlled evidence pack for audits, insurance reviews and contractor handovers.
The aim is not to create more paperwork. It is to make sure the paperwork already held does its job. A record that exists but cannot be followed is a liability. A record that closes the loop is evidence, and evidence is what stands up when the plant team is asked to prove that refrigeration equipment has been managed properly.
