4 Ton Rheem 16 SEER2 R454B Side Discharge Heat Pump System RD16AY48AJVCA, RH2TY4821STANNJ
This is the size where the Classic Plus cabinet advantage becomes dramatic. The RD16AY48AJVCA packs 48,000 BTU of inverter-driven heat pump capacity into a cabinet 36.6 inches tall at 221 pounds — where the equivalent Prestige series unit stands 58 inches and weighs 296. Matched to the 21-inch RH2TY4821STANNJ two-stage air handler, the system is rated 16 SEER2 on low-GWP R-454B refrigerant and certified under AHRI reference 217349674.
Is a 4 Ton Heat Pump the Right Size?
Four tons covers roughly 2,000 to 2,400 square feet in a hot, humid climate and is a common specification for two-story homes on a single system, larger open-plan houses, and single-phase light commercial suites. The inverter compressor modulates from 45% to 100%, so this unit can operate at about 1.8 tons on a mild afternoon rather than cycling hard at full output.
At 4 tons the physical difference between this series and the Prestige line is worth raising with every customer. A 58-inch outdoor cabinet is taller than most patio fences, creates a visible obstruction from windows, and complicates balcony and elevated-platform work. This one is a little over three feet tall and 75 pounds lighter. The tradeoff is 16 SEER2 against 18, and 8.5 HSPF2 against 10 — real but modest in a cooling-dominated climate.
Ideal for: Two-story homes on a single system, 2,000 to 2,400 square foot houses, elevated platforms and balconies where weight matters, and sightline-sensitive placements.
Need higher efficiency? The 4 Ton RD18AY48AJVCA Prestige Series system steps up to 18 SEER2 and 10 HSPF2 with the same RH2TY4821STANNJ air handler.
Recommended sizing ranges are general guidelines only. Actual system requirements depend on insulation, duct design, window area, ceiling height, occupancy, heating load, and local design conditions. Run our AC tonnage and BTU calculator, request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | RD16AY48AJVCA — 4 Ton Endeavor Line Classic Plus Series Side-Discharge Universal Heat Pump |
|---|---|
| Indoor Air Handler | RH2TY4821STANNJ Two-Stage Constant Torque Multiposition Air Handler |
| Application | Residential and Light Commercial Split Heat Pump System with Field-Installed Electric Backup Heat |
| Refrigerant | R-454B |
| Nominal Capacity | 48,000 BTU / 4 Tons |
| Rated Efficiency | 16 SEER2 Cooling, up to 10.5 EER2 and 8.5 HSPF2 |
| Outdoor Cabinet | 19.8 in. W x 40.4 in. D x 36.6 in. H, approximately 221 lb |
| Outdoor Electrical | 26.0 A minimum circuit ampacity, 45.0 A maximum overcurrent protection |
| Air Handler Cabinet Width | 21 inches |
| AHRI Reference Number | 217349674 |
| Electrical | 208-230V, Single Phase, 60 Hz |
Note that the indoor cabinet steps to 21 inches at this capacity while the outdoor unit stays 19.8 inches wide. On a retrofit from a 3 ton system, the closet is usually the constraint rather than the yard: budget for widening the framed opening or reworking the supply plenum transition, which is the most common surprise on a 3 to 4 ton upsize.
Heat Pump & Air Handler Features
RD16AY48AJVCA Side-Discharge Heat Pump
- 48,000 BTU from a cabinet only 36.6 in. tall and 19.8 in. wide
- Approximately 221 lb operating weight, 75 lb lighter than the Prestige equivalent
- PlusOne variable speed twin rotary compressor with inverter drive
- Continuous modulation from 45% to 100% of rated capacity
- 26.0 A minimum circuit ampacity, 45.0 A maximum overcurrent protection
- 61 dBA rated, with levels as low as 50 dBA at reduced compressor speed
- Sound blanket, swept wing fan, and optimized refrigerant tubing
- EcoNet enabled with built-in Bluetooth and PlusOne Diagnostics
- 7mm condenser copper coil reduces refrigerant charge requirements
- 10-year conditional parts warranty with registration
RH2TY4821STANNJ Air Handler
- 21-inch cabinet covering 3.5 and 4 ton airflow requirements
- 3/4 HP constant torque ECM blower motor
- Two-stage airflow with multiple selectable speed taps
- Roughly 1,600 CFM at 4 ton nominal
- 1.0 inch foil-faced insulation for quieter operation at higher CFM
- All-aluminum coil with internally grooved tubing
- Factory thermal expansion valve matched to R-454B
- 4-way convertible for upflow, downflow, and horizontal applications
- Accepts larger field-installed auxiliary heater kits
- Rugged steel cabinet with under 2% leakage at 1-inch H2O
Specifications & Manuals
Product documentation includes heat pump and air handler technical specifications and installation instructions to assist with equipment selection, permitting, installation, and service.
Frequently Asked Questions
How much smaller is this than the Prestige 4 ton unit?
Substantially. This cabinet is 36.6 inches tall at roughly 221 pounds; the RD18AY48AJVCA is 58 inches tall at roughly 296 pounds. Both are 19.8 inches wide and 40.4 inches deep, so the entire difference is height and weight.
What am I giving up at 16 SEER2 versus 18?
Cooling season efficiency and cold-weather heating capability. The RD16AY is rated up to 8.5 HSPF2 against the Prestige unit's 10. In a cooling-dominated climate the annual cost difference is modest; in a heating-heavy one it is worth modeling against the price gap.
Why does the outdoor unit stay narrow while the air handler gets wider?
They solve different problems. The outdoor coil gains area through cabinet height in a side-discharge design. The indoor coil needs face area perpendicular to the duct, which means physical width. That is why the air handler steps to 21 inches at this capacity while the condenser does not.
What circuit does the RD16AY48AJVCA require?
Rheem lists 26.0 A minimum circuit ampacity with 45.0 A maximum overcurrent protection. The indoor circuit is sized separately once the electric heater kit is selected. Confirm both against the unit nameplates.
Can this be installed on a balcony or elevated platform?
The 221-pound operating weight and compact cabinet make elevated installations more practical than with a conventional 4 ton condenser, but structural capacity and vibration isolation still have to be verified for the specific platform. Follow the mounting guidance in the installation instructions.
How do I size backup heat for a 4 ton heat pump?
Backup heat is sized from the heating load below the balance point and the emergency heat expectation, not from cooling tonnage, and available panel capacity constrains the choice. Our heat strip guide lists the compatible Rheem kits.
RD16AY Technical SpecificationsRD16AY Installation InstructionsRH2TY Technical SpecificationsRH2TY Installation InstructionsRheem Warranty Certificate
