Missing P-Trap on HVAC Condensate Drain

HVAC systems are complex in nature, and it is important to have a trained Professional Inspector inspect your HVAC system who can find deficiencies that an untrained eye would not notice.

One problem that I often see is a missing P-Trap in the condensate drain.  There are many reasons why the P-Trap would be missing, but the most common is that the installation was completed or modified by the homeowner.

The image above shows a condensate drain line that is missing a P-Trap

What is a P-Trap?  A P-Trap is a trap is a device which has a shape that uses a bending path to capture water to prevent sewer gases from entering buildings, while allowing waste to pass through.  Without a P-Trap, gases from the sewer line to which it is connected will make their way up through the drain, causing the sewer smell to enter the dwelling.  The condensate drain P-Trap should be equipped with a cleanout downstream nearby with a removable cap.  The exit point of the P-Trap should be lower than the entrance point to allow the condensate to properly drain.  For information on routing your HVAC Condensate drain line, check out  this article on HVAC Condensation Drain Line Routing

hvac ptrap

Blue Star Real Estate Inspection Services has the knowledge to help you make an informed decision when purchasing a house.  Call 361-462-9018 today to schedule your home inspection, or visit our website at www.blue-starinspections.com to request a free quote.


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