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AHU-FC14 · Air-side AHU · ASHRAE Guideline 36 FC14

Temperature drop across inactive cooling coil

Cooling valve is commanded closed but air is still being cooled as it crosses the coil.

Capacity-basedBAS trendsGuideline 36Medium effort

What does AHU-FC14 mean?

Cooling valve is commanded closed but air is still being cooled as it crosses the coil.

Why does it matter?

Strong evidence of a leaking cooling valve — chilled water is reaching the coil that's supposed to be off, and removing heat. This is a top hidden waste in heating season.

What should you do?

Hydraulically isolate the coil and re-check. Replace the cooling valve or its seat. Check whether the actuator is travelling full stroke.

How Energy Agent prices a finding

Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated

Screening-level estimates; confirm with measurement and verification before capital commitment.

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Send twelve months of interval data and a BAS trend export. Energy Agent returns a ranked list of what is wasting money, what each item is worth per year at your tariff, and what to do about it.

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