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UL Controlled Lab Test — Trane 7.5-Ton RTU

Underwriters Laboratories measured a seven-year-old 7.5-ton Trane packaged rooftop unit under AHRI 340/360-2007 and ASHRAE 37-2009, treated it, ran it 400+ hours, then re-measured it under identical conditions.

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UL Controlled Lab Test — Trane 7.5-Ton RTU — Commercial HVAC site

Client Objective

Verify the current capacity and efficiency of a seven-year-old packaged rooftop unit against original equipment manufacturer design specifications.

Determine what material changes, if any, occur in that same unit after being treated with EnviroTemp.

Outcome & Benefits

The baseline established that the unit had lost a considerable amount of capacity and efficiency relative to its 90,000 BTU/h OEM design specification — measuring only 64,796 BTU/h.

After treatment and 400+ hours of full-load runtime, the same unit measured 77,060 BTU/h with EER improving from 6.50 to 7.96 while total measured power fell from 9.97 kW to 9.68 kW.

Physical condensate capture independently corroborated the capacity result, rising 24.6% in the same 30-minute collection window.

Verified evidence record

What was tested, and how

Equipment: 2008 Trane 7.5-ton packaged rooftop unit, model TSC090A3EGAZUB
Age: 7 years old at time of test (2008 unit, tested 2015)
Refrigerant: R-22, 9.80 lb charge (recovered, acid-tested and reinstalled to nameplate)
Initial condition: Considerable degraded capacity and efficiency loss versus OEM design specification: 64,796 BTU/h measured against 90,000 BTU/h design, EER 6.50 against 10.3 design.
Treatment: 8 oz of EnviroTemp — matched to nominal design tonnage — injected into the evaporator section while the unit ran under load.
Runtime before final measurement: 400+ hours at full load in a holding chamber before the post-treatment measurement.
Testing conditions: AHRI 340/360-2007 100% “A” test in an AHRI-certified dual psychrometric chamber: 95 °F DB / 75 °F WB outdoor, 80 °F DB / 67 °F WB entering evaporator air, 400 CFM per ton at design static pressure. Three 10-minute collection segments averaged, utility-grade power meters, NIST-certified hot-wire anemometer airflow verification per ASHRAE 37-2009 §7.7.
Source / documentation: UL LLC Laboratory Data Package — Project 4786820856, Sample 2030380-NW, Plano TX (TL-339)