Can air conditioning unit service (split, vrf, packaged) move from a fixed interval to a condition-based check?

Partly: part of the task converts to a condition and part stays on the calendar. Performance converts to the controller trend; the refrigerant leak check on systems above the charge threshold is statutory and stays on its own line.

What condition would trigger air conditioning unit service (split, vrf, packaged) instead of the calendar?

Supply air temperature differential below the commissioned value by 3 C, compressor run time rising for the same load, filter differential high, or refrigerant leak detection

What reading proves air conditioning unit service (split, vrf, packaged) was done?

Supply and return air temperature differential, compressor run hours, filter differential, controller fault codes. Observed by: Unit controller or BMS trend; differential pressure switch on the filter.

What evidence does air conditioning unit service (split, vrf, packaged) produce for an ISO 55001 or ISO 45001 audit?

Controller trend per unit against commissioning values and the service keyed to it

Every task type · HVAC

Air conditioning unit service (split, VRF, packaged)

A unit that is losing capacity shows a smaller temperature split and longer run hours. The quarterly service is a technician reading what the controller already knows.

partly

part of the task converts to a condition and part stays on the calendar

Unit controller or BMS trend; differential pressure switch on the filter

how the condition is observed

HVAC

asset class

Condition that replaces the interval: Supply air temperature differential below the commissioned value by 3 C, compressor run time rising for the same load, filter differential high, or refrigerant leak detection
Reading that proves it: Supply and return air temperature differential, compressor run hours, filter differential, controller fault codes
Why the interval stays: Performance converts to the controller trend; the refrigerant leak check on systems above the charge threshold is statutory and stays on its own line.
Evidence an auditor accepts: Controller trend per unit against commissioning values and the service keyed to it
First move: Record the commissioned temperature split on each unit; that is the reference the trend falls from.

What it is evidence for

Clause references from a human-verified corpus licensed to Maintenance Log Converter. A clause marked reference is named, not reproduced.

Calendar tasks a monitored condition could replace ISO 55001:2014 9.1 · ISO 55001:2014 8.1 · ISO 55001:2014 6.2.2 · ISO 55001:2014 8.2 · ISO 55001:2014 10.3 · ISO 45001:2018 8.1.3

ISO 55001:2014 9.1 Monitoring, measurement, analysis and evaluation

The organization determines what needs to be monitored and measured, the methods for monitoring, measurement, analysis and evaluation to ensure valid results, when monitoring and measuring is performed, and when results are analysed and evaluated. It evaluates and reports on asset performance, asset management performa...

Evidence an auditor accepts: Performance measurement framework covering asset, asset management and system performance; Condition, reliability and cost data with defined collection methods; Periodic performance reports (financial and non-financial)

ISO 55001:2014 8.1 Operational planning and control

The organization plans, implements and controls the processes needed to meet requirements and to implement the actions determined in planning, including the actions to address risks and opportunities and the asset management plans. It establishes criteria for the processes, implements control in accordance with the cri...

Evidence an auditor accepts: Procedures and work instructions for life-cycle activities (acquire, operate, maintain, renew, dispose); Process criteria and performance measures; Work records demonstrating activities carried out as planned

ISO 55001:2014 6.2.2 Planning to achieve asset management objectives

The organization integrates the planning to achieve asset management objectives with other organizational planning, including financial, human resources and other support functions. It establishes, documents and maintains asset management plans that define the decision-making method and criteria, the processes and meth...

Evidence an auditor accepts: Asset management plans per asset class or system with activities, resources, owners and dates; Documented decision-making method and criteria for prioritising activities; Life-cycle cost or whole-of-life models supporting the plans

ISO 55001:2014 8.2 Management of change

Risks associated with any planned change, permanent or temporary, that can have an impact on achieving the asset management objectives are assessed before the change is implemented, and the organization ensures such risks are managed in accordance with 6.1 and 6.2.2. The organization controls planned changes and review...

Evidence an auditor accepts: Change management procedure covering assets, processes, organization and suppliers; Change risk assessments prior to implementation; Post-implementation reviews of unintended consequences

ISO 55001:2014 10.3 Continual improvement

The organization continually improves the suitability, adequacy and effectiveness of its asset management and its asset management system.

Evidence an auditor accepts: Improvement register with sources (audits, reviews, performance analysis, incidents); Evidence of improvements implemented and their measured effect; Trend of performance measures over time

ISO 45001:2018 8.1.3 Management of change

The organization establishes processes for the implementation and control of planned temporary and permanent changes that impact OH&S performance, including new products, services and processes or changes to existing ones (workplace locations and surroundings, work organization, working conditions, equipment, workforce...

Evidence an auditor accepts: Management of change procedure covering all listed change types; Change risk assessments before implementation; Records of unintended changes reviewed and mitigated

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