3-PAGE VECTOR A4 STUDIO
For a 7.5-Ton Packaged Rooftop Unit (RTU) charged with 22 lbs 8 oz (22.50 lbs) of R-448A (GWP 1387, ASHRAE Class A1), the 2026 EPA 40 CFR Part 84 maximum leak rate threshold is 10% (Comfort Cooling (10% Max EPA Leak Rate)). Adding more than 2 lbs 4 oz (2.25 lbs) in 12 months (Rolling Average) or 0 lbs 9 oz (0.55 lbs) within 90 days (Annualizing) triggers a mandatory 30-day repair clock and 10-day follow-up verification test.
Pre-computed for a nominal factory full charge of 22 lbs 8 oz under the 10% Comfort Cooling (10% Max EPA Leak Rate) limit:
| Days Since Last Charge | Annualizing Multiplier | Max Addition Before 10% Trigger (Annualizing) | Max 12-Mo Addition (Rolling Avg) | 125% Chronic Leaker EPA Report Limit |
|---|---|---|---|---|
| 30 Days | 12.17x | 0 lbs 3 oz (0.18 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| 60 Days | 6.08x | 0 lbs 6 oz (0.37 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| 90 Days | 4.06x | 0 lbs 9 oz (0.55 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| 180 Days | 2.03x | 1 lbs 2 oz (1.11 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| 270 Days | 1.35x | 1 lbs 11 oz (1.66 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| 365 Days | 1.00x | 2 lbs 4 oz (2.25 lbs) | 2 lbs 4 oz (2.25 lbs) | 28 lbs 2 oz (28.13 lbs) |
| DOT Cylinder Specification | Water Capacity (WC) | Typical Tare Wt | R-448A SG @ 130 degF | Max 80% Net R-448A Charge | Max Safe Gross Scale Reading |
|---|---|---|---|---|---|
| 30-lb DOT-4BA400 Refrigerant Recovery Cylinder | 26.2 lbs | 17.8 lbs | 0.89 | 18 lbs 10 oz (18.65 lbs) | 36 lbs 7 oz (36.45 lbs) |
| 50-lb DOT-4BA400 Refrigerant Recovery Cylinder | 47.6 lbs | 28.5 lbs | 0.89 | 33 lbs 14 oz (33.89 lbs) | 62 lbs 6 oz (62.39 lbs) |
| 125-lb DOT-4BW400 Commercial Recovery Cylinder | 123.0 lbs | 62.0 lbs | 0.89 | 87 lbs 9 oz (87.58 lbs) | 149 lbs 9 oz (149.58 lbs) |
Under the US EPA AIM Act Subsection (h) rule (40 CFR Part 84, Subpart C) effective January 1, 2026, any 7.5-Ton Packaged Rooftop Unit (RTU) operating with R-448A (Solstice N40, AR4 GWP 1387) holding 15.0 pounds or more of refrigerant is subject to mandatory federal leak rate calculations and 3-year recordkeeping. With a nominal factory charge of 22 lbs 8 oz (22.50 lbs), this 7.5-Ton Packaged RTU exceeds the 15-pound threshold by 7.5 lbs and falls under the 10% maximum annual leak rate limit for Comfort Cooling (10% Max EPA Leak Rate).
SAFETY & OIL COMPATIBILITY: R-448A carries an ASHRAE Class A1 non-flammable classification and utilizes Standard 1/4-inch Right-Hand Flare (RH) service connections. This system circulates POE (Polyolester Synthetic Oil), which is highly hygroscopic in POE applications—requiring evacuation verification below 500 microns using an electronic thermistor or capacitance micron gauge prior to recharging.
FRACTIONATION & GLIDE WARNING: R-448A is a zeotropic blend exhibiting a 8 degF temperature glide. If a leak occurs in a two-phase section of the 7.5-Ton Packaged RTU (such as Retrofitted R-404A/R-22 elastomers, Schrader valve O-rings, and supermarket rack oil separator float flanges.), the lower-boiling-point component vents preferentially, altering the remaining blend composition. Always charge R-448A strictly as Liquid Only (Mandatory — High 8.0 degF Temperature Glide) through a commercial throttling valve.
For a 7.5-Ton Packaged Rooftop Unit (RTU) holding 22 lbs 8 oz (22.50 lbs) of R-448A under the 10% Comfort Cooling (10% Max EPA Leak Rate) limit, adding more than 2 lbs 4 oz (2.25 lbs) over a rolling 365-day period triggers the mandatory 30-day EPA repair clock. Under the Annualizing Method, if only 90 days have elapsed since the last charge, adding just 0 lbs 9 oz (0.55 lbs) will exceed the 10% annualized threshold.
Yes. Because R-448A has a GWP of 1387 (greater than 53) and this 7.5-Ton Packaged RTU holds 22 lbs 8 oz (22.50 lbs) (at or above the 15-pound threshold effective January 1, 2026 under 40 CFR Part 84), the building owner and servicing contractor must calculate leak rates on every addition, perform initial and 10-day follow-up verification tests, and keep records for 3 years.
Under 40 CFR 84.106(j), if cumulative refrigerant additions to this 22 lbs 8 oz (22.50 lbs) 7.5-Ton Packaged RTU reach or exceed 125% of its full charge (28 lbs 2 oz (28.13 lbs)) within a single calendar year, the owner/operator must submit a Chronic Leaker Report to the EPA by March 1 of the following year describing the root cause and corrective plan.