Plumbing · P-YWXY6

Connections to Roof-Top Unit

Materials

Elements

Columns Roofs Floors / Slabs Waterproofing / Flashing Insulation Drainage Connections / Plates

About this detail

A schematic layout details the piping arrangements for a gas-fired rooftop air conditioning or makeup air unit. The gas train branches off the top of the gas pipe main and incorporates a full-size gas cock, ground joint union, dirt leg with a minimum three and a half inch clearance above the roof, and a gas pressure regulator with a downstream tee ten pipe diameters away. Condensate drainage features an adapter connecting to the equipment stub, a minimum three-quarter inch drain pipe sized per equipment connection, a trap with a minimum depth of four inches or half the static pressure, and a six-foot tall vent open to the atmosphere where required by code. All piping is supported on the roof per specifications with at least six inches of clearance, arranged with elbows to allow for thermal expansion and contraction, and sloped at a minimum of two percent toward discharge.

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