4 Ton Rheem 15.2 SEER2 R454B Two Stage Heat Pump System RP15AY48AJ2NA, RH2TY4821STANNJ
For homes in colder service areas or with high heating demand, this 4 ton Rheem system pairs the RP15AY48AJ2NA two-stage heat pump with the RH2TY4821STANNJ air handler and supports up to a 20 kW breakered backup heat strip. Rated 15.2 SEER2 under AHRI #215415452 on R-454B refrigerant, it serves larger two-story homes and high-load spaces that need strong airflow and dependable heat on the coldest mornings.
Is a 4 Ton Heat Pump System the Right Size?
Rheem rates this match at 45,500 BTU/h of cooling, 44,000 BTU/h of heating at 47°F, and 29,600 BTU/h at 17°F. That fits larger homes, houses with high ceilings or extensive glass, and hot-climate homes with long cooling seasons.
Airflow is the make-or-break factor at 4 tons. Supply and return ducts must be sized to carry the higher airflow without whistling registers or a noisy return. Insulation, climate, and how the home is used still drive the load, so confirm with a calculation before choosing between 3.5, 4, and 5 tons.
Ideal for: Larger two-story homes, homes with vaulted ceilings or lots of glass, colder-climate homes needing larger backup heat, and replacement of an existing 4 ton heat pump.
Need more capacity? Step up to the 5 Ton Rheem 15.2 SEER2 R454B Two Stage Heat Pump System RP15AY60AJ2NA, RH2TY6024STANNJ, the largest system in this series.
Recommended system sizes are general guidelines only. Actual heating and cooling requirements depend on insulation, climate, windows, ductwork, ceiling height, and occupancy. A Manual J load calculation is the best way to confirm sizing. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | RP15AY48AJ2NA — 4 Ton R-454B Two-Stage Heat Pump |
|---|---|
| Indoor Air Handler | RH2TY4821STANNJ — 3.5-4 Ton Two-Stage Multipoise Air Handler with TXV |
| System Rating | 15.2 SEER2, 11.7 EER2, 7.8 HSPF2, 45,500 BTU/h Cooling, AHRI #215415452 |
| Refrigerant | R-454B (A2L, Low GWP) |
| Compressor | Two-Stage Scroll Compressor |
| Defrost | Demand Defrost Control |
| Electrical | 208/230V, Single Phase, 60 Hz Heat Pump — MCA 27 A, Max Breaker 45 A |
| Air Handler Electrical | 208-240V, Single Phase — 3/4 HP Constant Torque Motor, 21" Cabinet |
This package uses the same RH2TY4821STANNJ air handler and 39" outdoor cabinet as the 3.5 ton system but adds a larger compressor and opens up a 20 kW breakered Rheem heat strip option. Plan for a 7/8" x 3/8" copper line set (offered on this listing), a 45 A maximum breaker, and a solid condenser pad for the 240 lb outdoor unit.
Heat Pump & Air Handler Features
RP15AY48AJ2NA Outdoor Heat Pump
- Two-stage scroll compressor (20 RLA, 141 LRA)
- 29,600 BTU/h heating at 17°F per Rheem tested data
- 7 mm copper tube condenser coil
- Demand defrost control
- 130 oz R-454B factory charge
- 7/8" suction and 3/8" liquid service valves
- PlusOne® Refrigerant Detection System
- PlusOne® Triple Service Access
- 39" H x 35-3/4" W x 35-3/4" L cabinet, 240 lbs
- Internal pressure relief valve and thermal overload
RH2TY4821STANNJ Multi-Position Air Handler
- Full 4 ton rating with two-stage airflow
- 3/4 HP constant torque (ECM) motor
- Nominal airflow of 1,400 CFM low / 1,600 CFM high
- 21" wide cabinet
- Factory TXV and A2L refrigerant sensor
- 4-way convertible installation
- 1" foil-faced insulation
- Heater kits include circuit breakers for service disconnect
- Side or top electrical connection provisions
- Accepts heat strips up to 20 kW breakered on this listing
Specifications & Manuals
Documentation includes RP15AY 4 ton capacity and electrical data, cold-weather heating performance, RH2TY airflow and heater kit tables, plus installation and warranty details.
Frequently Asked Questions
When does a 4 ton RP15AY48AJ2NA heat pump make sense?
When a load calculation shows roughly 48,000 BTU/h, which is common in larger two-story homes, homes with high ceilings, and hot climates with long cooling seasons.
What is the difference between the 3.5 ton and 4 ton RP15AY systems?
Both use the RH2TY4821STANNJ and the same 39" outdoor cabinet with a 130 oz charge. The 4 ton adds about 5,500 BTU/h of cooling, supports a 20 kW heat strip, and needs a 45 A maximum breaker versus 40 A.
What size breaker does the RP15AY48AJ2NA need?
Rheem lists a 27 A minimum circuit ampacity and a 45 A maximum overcurrent protection using an HACR breaker or fuse.
Can this 4 ton system help with humidity control?
Yes. Two-stage operation runs longer at low speed for better moisture removal, and Rheem's installation instructions include wiring for two-stage thermostats with dehumidification.
What is the largest heat strip for the 4 ton system?
This listing offers up to a 20 kW breakered heat strip (RXBH-1724A20J-1), along with 5, 8, 10, and 15 kW options.
What airflow does the RH2TY4821STANNJ deliver?
Rheem lists nominal airflow of 1,400 CFM on low stage and 1,600 CFM on high stage for the RH2TY4821 air handler.
RP15AY Technical SpecificationsRP14AY, WP14AY, RP15AY Installation InstructionsRH2TY Technical SpecificationsRH2TY Installation InstructionsRheem Warranty Certificate
