4 Ton Rheem 13.8 SEER2 R454B Single Stage Central System RA14AY48AJ1NA, RH1AY4821STANNJ
This 4 ton Rheem Endeavor® Line Classic® system matches the RA14AY48AJ1NA condenser with the RH1AY4821STANNJ single-stage-airflow air handler, AHRI certified at 13.8 SEER2 (#217232242). It delivers 48,000 BTU/h on low-GWP R-454B refrigerant, with Rheem's PlusOne® Refrigerant Detection System™ in the air handler. It's a cost-conscious choice for large homes that need dependable capacity. It's cooling only, with Rheem electric heat strips up to 20 kW offered.
Is a 4 Ton Air Conditioning System the Right Size?
A 4 ton system delivers 48,000 BTU/h of nominal cooling. It's often used in 4-bedroom homes around 2,100–2,500 sq. ft. as a general reference. Very hot climates or large glass areas can reach 4 tons at smaller square footage.
At 4 tons, duct design is critical. Undersized ductwork causes noise, lower efficiency and uneven comfort. A Manual J load calculation paired with a Manual D duct review confirms the fit.
Ideal for: 4-bedroom homes, two-story homes on one system and larger open-plan layouts.
Need more capacity? Step up to the 5 Ton Rheem 13.8 SEER2 R454B Single Stage Central System RA14AY60AJ1NA, RH1AY6024STANNJ for the largest loads.
Recommended home sizes are general guidelines only. Actual system requirements depend on insulation, climate, windows, ductwork, occupancy and a proper load calculation. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condensing Unit | RA14AY48AJ1NA — 4 Ton Rheem Classic R454B Air Conditioner |
|---|---|
| Indoor Air Handler | RH1AY4821STANNJ Single-Stage Airflow Multipoise Air Handler (21" Wide, N-Coil) |
| Application | Cooling-Only Central Air Split System (Electric Heat Kit Optional) |
| Refrigerant | R-454B (Low-GWP A2L Refrigerant) |
| Compressor | Single-Stage Scroll Compressor |
| Metering Device | Factory-Installed Expansion Valve on Indoor Coil (TXV) |
| Electrical | 208/230V, Single Phase, 60 Hz Condensing Unit — 30 MCA / 50A Max Overcurrent |
| Air Handler Electrical | 208/240V, Single Phase — 7 MCA / 15A Max Overcurrent (No Heat Kit) |
The RA14AY48AJ1NA condenser is 35" tall on a 33.75" x 33.75" base and weighs 243 lbs (operating). It uses a 24" three-blade Swept Wing fan moving 3,606 CFM and has a 74 dBA sound rating. The RH1AY4821STANNJ air handler is 21" wide and 50.5" tall, with a 3/4 HP motor. For comparison, see the 4 ton Rheem Select WA14AY48AJ1NA, RH1AY4821STANNJ system.
Condensing Unit & Air Handler Features
RA14AY48AJ1NA Outdoor Condensing Unit
- 48,000 BTU/h nominal cooling capacity
- Single-stage scroll compressor
- 74 dBA weighted sound power rating
- 7 mm copper tube condenser coil uses less refrigerant
- 142 oz. factory R-454B charge for 15 ft. of line set
- 24" three-blade Swept Wing fan with 1/5 HP motor
- 3/8" liquid and 7/8" suction front-seating service valves
- PlusOne® Expanded Valve Space and Triple Service Access
- Composite base pan, powder-coated paint and rust-resistant screws
- 10-year conditional parts limited warranty (registration required)
RH1AY4821STANNJ Single-Stage Air Handler
- Single-stage airflow with a constant torque (ECM) motor
- 3/4 HP constant torque motor, 1,400/1,600 CFM nominal airflow
- PlusOne® Refrigerant Detection System™ with factory-installed A2L sensor
- Aluminum fins bonded to internally grooved aluminum tubing
- 4-way convertible: upflow, downflow, horizontal left or right
- 1.0" foil-faced cabinet insulation for quieter operation
- Cabinet air leakage under 2% at 1" H₂O (ASHRAE 193)
- Slide-out blower and factory leak-tested coil
- Expansion valve on indoor coil for AC or heat pump use
- Field-installed heater kits up to 20 kW with UL/cUL-listed breakers
Specifications & Manuals
Documentation includes RA14AY electrical, sound, dimensional and line-size data, condenser and air handler installation instructions, the RA14AY brochure, RH1AY airflow and heater tables and the Rheem limited warranty.
Frequently Asked Questions
Why is the 4 ton rated 13.8 SEER2 when the 3.5 ton is 14.3?
Rheem's "14" model code covers 13.8 to 14.3 SEER2 condensers. The 4 and 5 ton RA14AY matches rate at 13.8 SEER2, and this system is AHRI certified at 13.8 (#217232242).
Does the 4 ton use the same air handler as the 3.5 ton?
Yes. The RH1AY4821STANNJ covers both the 3.5 and 4 ton RA14AY matches. The installer sets the airflow for the larger condenser at startup.
What electrical service does the RA14AY48AJ1NA need?
Rheem lists a 30 amp minimum circuit ampacity and a 50 amp maximum overcurrent protection on 208/230V single phase. The compressor is rated at 22 RLA.
How does this compare to the Rheem Select 4 ton RH1AY system?
The Rheem Select WA14AY48AJ1NA, RH1AY4821STANNJ system uses the same air handler with a Select-series condenser. The RA14AY48 adds Classic features like the composite base pan and Triple Service Access.
Is there a two-stage airflow version of this 4 ton system?
Yes. The 4 ton RA14AY48AJ1NA, RH2TY4821STANNJ system pairs the same condenser with a two-stage-airflow RH2TY air handler and a higher SEER2 match.
What crankcase heater part numbers fit the RA14AY48AJ1NA?
Rheem lists the 44-103663-16 crankcase heater with temperature thermostat and the 44-17402-45 without one as accessories for the RA14AY48.
RA14AY Technical SpecificationsRA14AY Installation InstructionsRA14AY BrochureRH1AY Technical SpecificationsRH1AY Installation InstructionsRheem Warranty Certificate
