4 Ton Rheem RHMVY4821SEACAJ Modulating Air Handler
The Rheem RHMVY4821SEACAJ is a 4 ton Endeavor Line modulating air handler — the top-tier indoor unit in Rheem's residential line, purpose-matched to R-454B inverter systems. Its truly variable-speed Constant CFM motor and factory-installed EEV coil, in a 21-inch cabinet, move the higher airflow a large home needs while modulating smoothly for quiet, even, 18+ SEER2 comfort, with an included PlusOne A2L refrigerant sensor.
Is the RHMVY4821SEACAJ the Right Air Handler?
Rated for 4 ton (48,000 BTU) R-454B systems, this air handler suits larger homes and higher-load layouts, operating across roughly 1,000 to 1,600 CFM in cooling and up to 1,700 CFM in heating with a matched RP19AY heat pump. The modulating blower is particularly valuable at this capacity: instead of delivering a single high airflow and cycling off, it settles into long, efficient runs that keep temperatures and humidity even across a bigger area.
Delivering the airflow a 4 ton system needs also depends on adequate duct capacity. At 21 inches wide and 57 inches tall, the cabinet keeps a manageable footprint, but a Manual J load calculation and a duct review should confirm both the capacity and the airflow path before installation.
Ideal for: 4 ton R-454B systems in larger homes and open floor plans with elevated heating and cooling demand.
Matched outdoor unit: Pair it with the 4 Ton Rheem RP19AY48AJVCA Inverter Heat Pump. For the largest homes, step up to the 5 Ton RHMVY6021SEACAJ.
Recommended applications are general guidelines only. Actual system requirements depend on the matched outdoor unit, insulation, duct design, and your local design temperatures. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Air Handler | RHMVY4821SEACAJ — 4 Ton Endeavor Line Modulating Air Handler |
|---|---|
| Nominal Capacity | 4.0 Tons / 48,000 BTU |
| Cabinet Size | 21 in. W × 57 in. H |
| Blower Motor | 3/4 HP truly variable-speed Constant CFM ECM, modulating (300–1300 RPM) |
| Rated Airflow | ~1,000–1,600 CFM cooling (up to 1,700 CFM heating with a matched RP19AY) |
| Indoor Coil | Factory-installed aluminum coil with Electronic Expansion Valve (EEV) |
| Line Connections | Liquid 3/8 in., Vapor 7/8 in. (copper sweat) |
| Refrigerant | R-454B (low-GWP A2L) |
| Refrigerant Detection | Factory-installed PlusOne A2L sensor with mitigation (included) |
| Controls | EcoNet Enabled communicating board with PlusOne Bluetooth diagnostics |
| Installation | 4-way convertible — upflow, downflow, horizontal left/right |
| Electrical | 208/240V, 1 Ph, 60 Hz — MCA 8, Max Breaker 15A (blower only); accepts field-installed heat kits |
| Shipping Weight | ~152 lbs. |
| Warranty | 10-Year Parts Limited Warranty (registration required) |
Built as the indoor match for Rheem's 4 ton R-454B inverter systems, this air handler pairs modulating airflow with EcoNet communicating control, an EEV coil, and an included A2L refrigerant detection sensor for efficient, whole-home performance.
Airflow & Design Features
Airflow & Efficiency
- Truly variable-speed Constant CFM modulating blower
- Rated ~1,000–1,600 CFM cooling for a 4 ton system
- Electronic Expansion Valve for precise refrigerant metering
- Part of 18+ SEER2 R-454B inverter systems
- Aluminum coil with low air-side pressure drop
- Less than 2% cabinet air leakage at 1-inch H2O
Controls, Safety & Serviceability
- EcoNet Enabled communicating control board
- PlusOne Bluetooth diagnostics and dip-switch-free commissioning
- Included PlusOne A2L refrigerant detection sensor
- Rugged 21-inch steel cabinet with 1.0-inch foil-faced insulation
- Field-installed RXBH electric heat kits with UL/cUL disconnect
- Slide-out blower and molded corrosion-resistant drain pan
Specifications & Manuals
Product documentation includes technical specifications, installation instructions, a parts list, and warranty information to assist with equipment selection, installation, and service.
Frequently Asked Questions
What system size does the 4 ton RHMVY4821SEACAJ support?
It is designed to match a 4 ton (48,000 BTU) R-454B outdoor unit, typically in larger homes. A Manual J load calculation should confirm the capacity and duct capability before selecting a 4 ton system.
Which condenser is matched with the RHMVY4821SEACAJ?
It pairs with a 4 ton R-454B outdoor unit such as the Rheem RP19AY48AJVCA inverter heat pump, and is also rated with matched RA19AY air conditioners, to form a communicating variable-speed system.
What are the refrigerant line connection sizes on this air handler?
The 4 ton RHMVY4821SEACAJ uses a 3/8-inch liquid line and a 7/8-inch vapor line, both copper sweat connections. Confirm charge requirements against the installation instructions for your matched outdoor unit.
Is the indoor coil aluminum or copper?
The evaporator coil is constructed of aluminum fins bonded to internally grooved aluminum tubing for improved corrosion resistance, with copper sweat connections for the refrigerant lines. It is factory-installed and leak-checked.
Can the RHMVY4821SEACAJ use field-installed electric heat?
Yes. A range of RXBH auxiliary electric heater kits is available for this model, each including circuit breakers that meet UL and cUL requirements for service disconnect. Refer to the electric-heat electrical data for the correct kit and circuit sizing.
How tall is the 4 ton RHMVY4821SEACAJ cabinet?
The cabinet is 21 inches wide and 57 inches tall. Confirm clearances, including the 24-inch front clearance required for filter and coil maintenance, against the installation instructions before installing.
RHMV Technical Specifications
Rheem Warranty Certificate
