Why Did My Cooling Coil Freeze? Top Ten Reasons

Last January’s two-week arctic blast brought temperatures that only reached single digits during the day and dipped below zero at night. The extreme weather sorely tested HVAC and plumbing systems, and PJM was inundated with service calls. Parts and equipment that usually aren’t affected by cold weather – cooling towers, plumbing lines, heat exchangers, etc. – were freezing and breaking all across our area, and AHU coils were particularly hard hit. Repairing broken coils (if they can, indeed, be fixed) can be tricky and time consuming, and coil replacement is a considerable task that can be extremely expensive.

Ten Reasons Why a Cooling Coil Might Freeze:

  1. Water, sludge, or debris inhibiting flow

  2. Lack of glycol

  3. Freeze protection pumps not working

  4. Plugged strainers

  5. Coil not drained and blown down properly for winter

  6. Control issues

  7. Dampers not working

  8. Stratification issues

  9. Failure to heat AHU during shutdown

  10. Main circulation pumps fail in low temps

Coil issues should always be entrusted to a highly knowledgeable, reputable contractor like PJM Mechanical Contractors, Inc., who will correctly identify the proper course of action, is capable of making the necessary repairs if the coil can be salvaged, and can identify why the freeze occurred and remedy the situation so it doesn’t happen again in the future.

About PJM

PJM Mechanical Contractors, Inc. is a multi-faceted mechanical contractor providing construction and installation, service and maintenance, and design/build services in a comprehensive range of mechanical disciplines that include HVAC, plumbing, controls, refrigeration, custom metal fabrication, piping, fire protection, and backflow preventer testing. PJM primarily serves clients in pharmaceuticals, manufacturing, healthcare, institutional, and other various commercial and industrial sectors.

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 1688 5th Street | Ewing, NJ  08638 | Tel: 609.921.1394 | Fax: 609.530.1437

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