RA14AY18AJ1NA – CLASSIC CONDENSER (1.5 TON, R454B, 14 SERIES, SEER2)

Rheem Endeavor Line Classic Series RA14AY outdoor condensing unit, 1.5 ton nominal (18,000 BTU/h), 208/230V single phase. Rheem rates it at 14.3 SEER2 / 11.7 EER2 with a single-stage scroll compressor and a 70 dB sound level. Note that Rheem publishes this model on R-454B refrigerant, not R-410A. Versus the Select (WA14AY) line, Classic adds PlusOne Triple Service Access and carries a 10-year conditional parts warranty.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• Nominal Capacity18,000 BTU/h (1.5 ton)
• Rated Cooling Capacity17,100 BTU/h
• SEER2 / EER214.3 / 11.7
• RefrigerantR-454B (97 oz factory charge)
• CompressorSingle-stage scroll
• Voltage / Phase / Hz208-230 V / 1 Ph / 60 Hz
• Sound Level70 dB
• Minimum Circuit Ampacity12 A
• Max Overcurrent Protection15 A
• Compressor RLA / LRA8 A / 47 A
• Line Connections (Liquid / Suction O.D.)3/8 in. / 3/4 in.
• Net Weight141 lb

Can I replace just the outdoor unit and keep the old indoor coil?

Not on this generation. The RA14AY and WA14AY are rated as AHRI matched systems with a specific RCFY coil or RH2TY air handler, and the TXV metering the refrigerant sits in that indoor unit, sized for R-454B. Bolt a new condenser to whatever coil is there and nothing about the result is certified, the charge will not land where the chart says, and you are outside the terms the system warranty was written against. On an R-410A coil it is a non-starter.

Why does my new unit say 14.3 SEER2 when the old one said 14 SEER?

The test changed, not the hardware. The DOE M1 procedure raised the static pressure the unit is tested against from 0.1 to 0.5 inches of water column, closer to what real duct does. Identical equipment rates about 4 to 5 percent lower, so a 15 SEER unit from 2020 is roughly 14.3 SEER2 today. Texas sits in the South region, where the floor is 14.3 SEER2 below 45,000 BTU and 13.8 at 45,000 and up - which is why our 18k through 42k read 14.3 and the 48k and 60k read 13.8.

Can I top off an R-410A system with R-454B?

No, and there is no drop-in. R-454B is roughly 69 percent R-32 blended with R-1234yf, an A2L, running slightly lower pressures on a different compressor and metering device. Mix the two and you have something nobody can charge to spec or reclaim. Charge R-454B as a liquid, by weight.

Can I reuse the line set?

Often yes, if it is the right diameter, clean, dry and holds a pressure test. R-454B uses the same POE oil as R-410A, so an R-410A set with no burnout history is a fair candidate. A set that once carried R-22 has mineral oil in it - flush it properly or run new copper.