How to prevent avoidable issues during qualification and how PSC Biotech®’s CQV and engineering capabilities support successful startup
Heating, Ventilation, and Air Handling Units (HVAC/AHUs) are among the most deviation‑prone systems during facility startups, expansions, and routine requalification. These systems directly affect environmental control, product stability, and data integrity, which makes them high‑visibility during audits and a frequent source of qualification setbacks.
PSC Biotech® provides full‑lifecycle Commissioning, Qualification, and Validation (CQV) support for facilities, utilities, equipment, and computerized systems, including HVAC/AHU systems and environmental control equipment. PSC’s engineering and CQV teams routinely identify, and prevent, the issues below.
A common failure point in AHU/HVAC qualification comes from mismatched design airflow vs. measured airflow, incorrect damper positions, or pressure cascades that don’t meet intended zoning. These issues often appear because commissioning activities were not properly documented or weren’t completed prior to qualification.
1. How deviations happen:
- Balancing reports that don’t match actual installed conditions
- Incorrect pressure relationships (e.g., ISO 8 → ISO 7 leaks)
- Incorrect pressure cascades (dirty to clean pressure flow)
- Terminal HEPA filters not seated, leak-tested, or certified
- Unverified or drifting differential pressure sensors
PSC performs commissioning, air balancing review, and qualification testing to ensure HVAC systems operate according to design specifications before qualification begins.
2. Calibration Gaps on Critical Sensors (Temp, RH, DP)
AHUs rely heavily on properly calibrated sensors. Deviations often arise from:
- Out-of-tolerance sensors discovered during IQ/OQ
- Missing or incomplete calibration certificates
- Sensors installed in incorrect or unrepresentative locations (e.g., return vs. supply)
Incorrect sensor placement or calibration inconsistencies can lead to failed uniformity tests, excursion alarms, or stability failures with a direct impact on product quality.
PSC Biotech® performs equipment qualification and pre-operational verifications, including calibration review, instrument checks, and system functionality assessments.
3. Poor Control Logic or Setpoint Configuration
HVAC/AHU control logic drives temperature, humidity, and pressure stability but logic errors frequently slip through if they’re not validated during commissioning.
Typical pitfalls include:
- Incorrect control sequences (preheat, reheat, cooling coil logic)
- Setpoints that don’t align with qualification acceptance criteria
- BMS alarms not configured to required thresholds
These gaps cause repeated OQ failures, nuisance alarms, or excursions during PQ.
4. Documentation and Traceability Issues During CQV
Many HVAC/AHU qualifications fall short not because of engineering issues, but because of incomplete documentation, especially during transitions from commissioning to qualification.
Common causes:
- Missing as-built drawings
- Unapproved redlines or undocumented field changes
- Inconsistent or missing commissioning evidence
- Lack of clear linkage between design intent and qualification criteria
PSC provides validation documentation, including IQ/OQ protocols, reports, and commissioning evidence, ensuring traceability and compliance throughout the qualification lifecycle.
5. Misalignment Between Engineering, QA, and CQV Teams
One of the biggest contributors to HVAC/AHU deviations is poor cross-functional alignment. Examples include:
- Engineering changes made during startup without updating qualification documents
- QA receiving incomplete documentation packages
- CQV teams discovering system issues after schedules are locked
PSC delivers coordinated engineering alongside CQV support, reducing disconnects between system design, commissioning, qualification, and production.
6. Ignoring Worst-Case Operating Conditions
HVAC systems often pass performance tests during mild conditions but fail during seasonal extremes.
Common oversights:
- Qualification done only in one season
- Failure to document recovery times after door openings or power disruptions
These oversights can cause unplanned deviations once the system is in routine use.
Summary
AHUs and HVAC systems are among the most deviation-prone systems in GMP facilities, especially during expansions or fast-paced startup timelines. Most issues trace back to predictable engineering pitfalls: misconfigured control logic, unverified or incorrect airflow/pressure, calibration gaps, incomplete mapping, and poor or incomplete documentation flow between teams.
PSC Biotech®’s engineering and CQV services help facility teams avoid these pitfalls by ensuring systems are:
- Installed correctly
- Functioning as designed
- Fully documented
- Ready for Qualification and long-term GMP operation
About PSC Biotech®
Founded in 1996, PSC Biotech® has spent 30 years providing life sciences with essential services to ensure that healthcare products are developed, manufactured, and distributed to the highest standards in compliance with all applicable regulatory requirements.
Our goal is to skyrocket our clients’ success. To achieve this, our method is straightforward; we put the client’s needs first. We attain top-tier expertise for each project stage, from generating comprehensive project plans to reaching extensive production operations into attentive asset management, authenticity, and non-expendable ventures.
Since our inception, PSC Biotech® has served as a strategic partner to emerging and established life science companies, all to help bring their life-saving products to market. PSC Biotech® operates in 52 countries globally and has served thousands of clients. Employing a global team of skilled professionals and experts that span strategically located offices in North America, Europe, Asia, the Middle East, and Australia, we are proud of the roles we have fulfilled to help our clients achieve success.
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