3-PAGE VECTOR A4 STUDIO
For a 5-Ton Commercial Rooftop Unit (RTU) charged with 16 lbs 8 oz (16.50 lbs) of R-134a (GWP 1430, 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 1 lbs 10 oz (1.65 lbs) in 12 months (Rolling Average) or 0 lbs 7 oz (0.41 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 16 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 2 oz (0.14 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| 60 Days | 6.08x | 0 lbs 4 oz (0.27 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| 90 Days | 4.06x | 0 lbs 7 oz (0.41 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| 180 Days | 2.03x | 0 lbs 13 oz (0.81 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| 270 Days | 1.35x | 1 lbs 4 oz (1.22 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| 365 Days | 1.00x | 1 lbs 10 oz (1.65 lbs) | 1 lbs 10 oz (1.65 lbs) | 20 lbs 10 oz (20.63 lbs) |
| DOT Cylinder Specification | Water Capacity (WC) | Typical Tare Wt | R-134a SG @ 130 degF | Max 80% Net R-134a Charge | Max Safe Gross Scale Reading |
|---|---|---|---|---|---|
| 30-lb DOT-4BA400 Refrigerant Recovery Cylinder | 26.2 lbs | 17.8 lbs | 1.07 | 22 lbs 7 oz (22.43 lbs) | 40 lbs 4 oz (40.23 lbs) |
| 50-lb DOT-4BA400 Refrigerant Recovery Cylinder | 47.6 lbs | 28.5 lbs | 1.07 | 40 lbs 12 oz (40.75 lbs) | 69 lbs 4 oz (69.25 lbs) |
| 125-lb DOT-4BW400 Commercial Recovery Cylinder | 123.0 lbs | 62.0 lbs | 1.07 | 105 lbs 5 oz (105.29 lbs) | 167 lbs 5 oz (167.29 lbs) |
Under the US EPA AIM Act Subsection (h) rule (40 CFR Part 84, Subpart C) effective January 1, 2026, any 5-Ton Commercial Rooftop Unit (RTU) operating with R-134a (Suva 134a / Genetron 134a, AR4 GWP 1430) 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 16 lbs 8 oz (16.50 lbs), this 5-Ton Commercial RTU exceeds the 15-pound threshold by 1.5 lbs and falls under the 10% maximum annual leak rate limit for Comfort Cooling (10% Max EPA Leak Rate).
SAFETY & OIL COMPATIBILITY: R-134a 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.
CHARGING & PINPOINT VERIFICATION: With a negligible glide of 0 degF and a normal boiling point of -14.9 degF, R-134a maintains stable saturation pressures (35 PSIG at 40 degF evaporator coil; 135 PSIG at 105 degF condensing temperature). During EPA initial and follow-up verification tests, inspect Centrifugal and screw chiller shaft seals, relief valve rupture discs, and walk-in medium-temp evaporator flare fittings..
For a 5-Ton Commercial Rooftop Unit (RTU) holding 16 lbs 8 oz (16.50 lbs) of R-134a under the 10% Comfort Cooling (10% Max EPA Leak Rate) limit, adding more than 1 lbs 10 oz (1.65 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 7 oz (0.41 lbs) will exceed the 10% annualized threshold.
Yes. Because R-134a has a GWP of 1430 (greater than 53) and this 5-Ton Commercial RTU holds 16 lbs 8 oz (16.50 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 16 lbs 8 oz (16.50 lbs) 5-Ton Commercial RTU reach or exceed 125% of its full charge (20 lbs 10 oz (20.63 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.