What Is a Pre-Functional Checklist? Definition, Anatomy & Roles Explained

A pre-functional checklist (PFC) is one of the first commissioning documents a junior MEP or commissioning engineer encounters on site, and also one of the least explained. If you have been handed a PFC to complete or witness, this article defines what it is, walks through every section it contains, explains who creates and signs it off, and shows you exactly where it fits in the commissioning programme. For broader context on the stage it belongs to, see What Is Commissioning in Construction?

What a Pre-Functional Checklist Is – The Short Answer

A pre-functional checklist (PFC) is a structured commissioning document used to verify that a system or piece of equipment has been correctly installed and is ready for energisation and functional performance testing. Per ASHRAE Guideline 0, these are formally termed “construction checklists”; ASHRAE Guideline 1.1 provides the HVAC&R technical requirements. The PFC is the static inspection gate that must be passed before dynamic functional testing begins.

The commissioning industry uses several phrases for this document. “Pre-functional checklist”, “PFT form”, “construction checklist”, “system verification checklist (SVC)” – they are different names but are the same thing. The wording difference comes down to the company / consultant, the specification standard, association or the country.

The full terminology map is included in the final section.

Why Pre-Functional Checklists Exist – The Problem They Solve

On projects that skip or rush the PFC, and equipment is usually energised before installation is actually ready for it. The functional performance tests usually fail quickly, the Commissioning engineer then logs the issues that, the contractor then needs three weeks to resolve, and the commissioning programme slides.

The PFC exists to close that gap. It operates as a quality gate – a formal checkpoint that the installing contractor must pass and complete before the commissioning team will authorise startup. The sequence is simple: PFC sign-off is the prerequisite for startup, and startup sign-off is the prerequisite for functional performance testing.

From a commissioning engineer’s perspective, PFCs protect the programme by catching installation deficiencies when they are cheapest to fix – before the system is live, before the test crew is on site, and before the project is under handover deadline pressure. A missing belt tensioning check found during a PFC takes minutes to resolve. The same deficiency found during an FPT, with the building owner watching, takes considerably longer.

Anatomy of a Pre-Functional Checklist – What It Actually Contains

The PFC is not a single-page sign-off sheet. It is a structured document that walks through every verifiable aspect of an installation, sequentially, from delivery and physical installation through to controls integration. In practice, the format is almost always a tabular checklist – line items in rows, with columns for a description of the check, pass/fail or N/A status, the contractor’s sign-off, and a CxE witness column. ASHRAE Guideline 1.1 provides the current HVAC&R technical framework; the specific content varies by equipment type – an AHU PFC will look different from a chiller PFC, which will look different from a switchgear PFC. The underlying structure, however, is consistent across all of them.

Don’t forget – here we are proving that the installation is ready for energised and functional testing.

Section 1 – Equipment Identification.

Tag number, manufacturer, model number, serial number, and design specification reference. This section confirms the right piece of equipment has been installed in the right location. It sounds basic, and it is – but we consistently see mismatched equipment where a substitution was made during procurement and the commissioning team was not notified.

Section 2 – Submittal and Documentation Verification.

Has the approved submittal been received and reviewed? Is the O&M manual on file? Are as-installed drawings available? The PFC will not progress without these because the commissioning team cannot verify installation compliance without having these documents to hand and for reference.

Section 3 – Delivery and Storage Inspection.

Physical condition check: damage during transit, appropriate storage conditions, protective caps and covers still in place, no moisture ingress. This section protects against the situation where a piece of equipment has been sitting in an unenclosed plant room through winter and nobody has documented its condition.

Section 4 – Installation Checks [static].

This is typically the longest section. Is the unit positioned correctly and mounted level? Does it have the correct maintenance space inline with manufacturers requirements? Is pipework connected and correctly oriented? Is ductwork connected and properly sealed? Is electrical wiring complete, appropriately routed, and terminated correctly? Are labels and identification plates fitted? Is access maintained for maintenance? For an AHU, this section might run to 30 or 40 line items covering filters, coil connections, drain pan slope, fan and motor arrangement, and control panel wiring.

The Section 2 – Submittals and Documentation are the references to complete this section accurately. You need to review the specifications, material / technical submissions, drawings, schematics, control drawings etc.

Section 5 – Pre-Startup Checks.

Belts tensioned and drives aligned. Oil and fluid levels correct. Strainers cleaned. Safety devices installed and interlocks wired. Isolation valves in the correct position. These checks confirm the equipment is in a state where it can be safely energised for the first time. Note: the manufacturer’s startup checklist is a separate document that runs in parallel at this stage – it is required in addition to the PFC, not instead of it.

Section 6 – Controls and BAS Point-to-Point.

Sequence of operations loaded and verified. BAS points checked against the I/O schedule. Alarms configured and tested. Sensors calibrated or calibration records provided. This section confirms the control system is ready to operate the equipment, not just that it is wired in.

Section 7 – Documentation and Sign-Off.

The installing contractor signs each completed section as work proceeds. The commissioning engineer reviews the completed document, witnesses key checks, and notes deficiencies. Once deficiencies are resolved, the CxM [or CxP on smaller projects] issues the formal proceed-to-test authorisation. Any outstanding items that do not prevent startup are logged on the pre-commissioning punch list [see our article: What Is a Pre-Commissioning Punch List?] for tracking through to closure.

Pre-Functional Checklist Template – What Yours Should Contain

A well-structured PFC template includes all seven sections above + any others based on the project specific requirements and equipment / systems, equipment-specific line items drawn from the approved submittal and ASHRAE Guideline 1.1 requirements, space for contractor sign-off per section, CxE witness / observation / issue columns, and a formal sign-off block for CxM authorisation.

Generic templates adapted from other projects frequently miss the detailed requirements of the particular design, controls section or conflate the PFC with the manufacturer’s startup checklist – both lead to problems downstream.

Pre-Functional vs. Functional Testing – Not the Same Stage

These two activities are not the same, and treating them as the same thing is one of the most common sources of confusion for engineers new to commissioning. The PFC is a static inspection completed before equipment is energised under operational load. Functional performance testing (FPT) is dynamic testing conducted after startup is complete, with systems running under varying operating conditions.

One point worth clarifying: “static inspection” does not mean no testing takes place at this stage. The pre-commissioning window includes testing activities such as pressure testing and flushing of pipework, cleaning of systems, dead testing of cables and switchgear, and torque testing of connections – these are all pre-energisation verification works that sit within the PFC phase. The distinction is that none of these activities involve the system operating under designed load conditions; that is what separates this stage from functional performance testing.

For a deeper explanation of how testing relates to the commissioning process overall, see Testing vs Commissioning: Understanding the Difference.

Who Creates, Completes, and Signs Off the PFC?

The PFC involves distinct roles:

Commissioning Provider – Manager

The CxP develops the checklists during the pre-design and design stage, under the ‘ASHRAE Construction Checklist’ requirements and expectations.

They can be created as a generic template [with control], developed from ASHRAE Guideline 1.1 requirements, and then updated incorporating the project specifics from the OPR, Basis of Design, approved equipment submittals, logics and drawings, reflecting the actual systems and equipment being installed on the project.

For more on the CxM’s role in developing commissioning documentation, see What Is a Commissioning Manager?

Installing Contractor or Specialist Subcontractor

Completes / fils out the PFC on site, item by item, as the system and equipment installation progresses. The contractor owns this process – they are signing off that work has been completed to specification. They are not receiving assistance from the commissioning team to fill it in.

Commissioning Provider – Engineer

Reviews the completed PFC, witnesses key checks where specified, and logs deficiencies against the punch list. The CxE is the quality filter between the contractor’s self-certification and the CxM’s formal sign-off. For a full account of what a CxE does across the construction phase, see What Does a Commissioning Engineer Do Day to Day?

Commissioning Provider – Manager

The Commissioning Manager issues the formal proceed-to-test authorisation once the PFC is complete and observations are resolved. On large or complex projects, the Owner’s Representative or PM may countersign this milestone.

For broader context on commissioning accountability across the full project team, see Who Is Responsible for Commissioning?.

When Does the PFC Happen in the Project Programme?

The PFC sits in what we call the pre-commissioning window – the period between mechanical completion and the start of functional performance testing. Understanding this window is critical for programme planning because PFCs are not completed all at once: they are issued and closed system by system as installation reaches completion across different areas of the building.

For pre-commissioning sequence checks specific to common MEP equipment, see our article: What Checks Are Done During Pre-Commissioning?

The PFC window is typically two to four weeks per system zone, though this compresses significantly on fast-track projects. Plan for it in the programme. Projects that treat PFCs as a formality to be completed retrospectively invariably find the commissioning phase absorbing the delay.

Terminology Guide – PFC, PFT, SVC, Construction Checklist

The terminology around pre-functional checklists is genuinely inconsistent across firms, countries, and specification standards – and it creates real confusion on site when a US-trained CxP issues “construction checklists” to a UK MEP contractor who has worked under BSRIA documentation their entire career.

• PFC – Pre-Functional Checklist: The US building commissioning standard label, used by the majority of CxP firms in North America. This is the term you are most likely to encounter when working under ASHRAE Guideline 0 or Guideline 1.1 specifications. [Note: projects commissioned under older specs may still reference Guideline 1.1]
• PFT Form – Pre-Functional Test Form: The same document under a different name, used by some CxP firms and in certain specification packages. The word “test” can mislead engineers into thinking this refers to functional testing; it does not. It is the same static inspection checklist.
• SVC – System Verification Checklist: A label used by some CxP firms – EABCO, among others – and prominent in a portion of the SERP for this query. The concept is identical to the PFC. The variation is a firm-level naming preference, not a procedural difference.
• Construction Checklist: ASHRAE Guideline 0 formal term for the same document. If you are working to an ASHRAE specification, this is what the spec will call it.
• Pre-Commissioning Checklist: The UK and BSRIA-adjacent label for the same stage. Used widely in European and Middle Eastern projects. Functionally equivalent to the PFC in a building commissioning context.
• Manufacturer’s Startup Checklist: This is a different document and it is important to understand the distinction. The manufacturer’s startup checklist covers the specific startup procedure for a piece of equipment as stipulated by the manufacturer. It runs at the startup stage, in parallel with or immediately after PFC closure. It is required in addition to the PFC – not as a substitute for it. The two documents serve different purposes: the PFC verifies installation compliance against the project specification; the manufacturer’s startup checklist verifies that the equipment is prepared for initial energisation per the manufacturer’s requirements. Both are required. Neither replaces the other.
• PSSR – Pre-Startup Safety Review: An OSHA term used in industrial and oil and gas commissioning. This does not apply to building commissioning. If you encounter this term on a building project, it has likely crossed over from a process plant or industrial context and is not appropriate to the MEP commissioning workflow.
• All of the building commissioning terms above describe equivalent activities. The variation is by firm, country, and specification standard – not by substance.