3 Ton Rheem 14.3 SEER2 R454B Single Stage Central System RA14AY36AJ1NA, RH1AY3621STANNJ
This Rheem Endeavor® Line Classic® system pairs the RA14AY36AJ1NA condenser with the RH1AY3621STANNJ single-stage-airflow air handler, AHRI certified at 14.3 SEER2 (#217232217). The 3621 puts a 3 ton coil in a 21" wide cabinet that's still only 42.5" tall. That makes it a direct fit for closets, platforms and return plenums built for a 21" air handler, with no need to transition down to 17.5". It uses low-GWP R-454B with Rheem's PlusOne® Refrigerant Detection System™. It's cooling only, with Rheem electric heat strips up to 15 kW offered.
Is a 3 Ton Air Conditioning System the Right Size?
A 3 ton system provides 36,000 BTU/h of nominal cooling. It's often used in 3-bedroom homes around 1,500–1,800 sq. ft. as a general guide. Hot, humid climates and homes with lots of glass may need more capacity for the same space.
When you're replacing an existing 21" air handler, matching the cabinet width keeps the supply and return connections simple. The load still matters most, so confirm 3 tons with a Manual J load calculation before you buy.
Ideal for: 3-bedroom homes replacing a 21" wide air handler, and short closets or attic platforms.
Need more capacity? Step up to the 3.5 Ton Rheem 14.3 SEER2 R454B Single Stage Central System RA14AY42AJ1NA, RH1AY4821STANNJ, which also uses a 21" wide air handler.
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 | RA14AY36AJ1NA — 3 Ton Rheem Classic R454B Air Conditioner |
|---|---|
| Indoor Air Handler | RH1AY3621STANNJ Single-Stage Airflow Multipoise Air Handler (21" Wide) |
| 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 — 18 MCA / 30A Max Overcurrent |
| Air Handler Electrical | 208/240V, Single Phase — 3 MCA / 15A Max Overcurrent (No Heat Kit) |
The RA14AY36AJ1NA condenser is 25" tall on a 33.75" x 33.75" base and weighs 186 lbs (operating), with a 71 dBA sound rating. The RH1AY3621STANNJ air handler is 21" wide and 42.5" tall and weighs 111 lbs, with a 10" x 10" blower. Complete the install with compatible thermostats and copper line sets and fittings.
Condensing Unit & Air Handler Features
RA14AY36AJ1NA Outdoor Condensing Unit
- 36,000 BTU/h nominal cooling capacity
- Single-stage scroll compressor
- 71 dBA weighted sound power rating
- 7 mm copper tube condenser coil uses less refrigerant
- 116 oz. factory R-454B charge for 15 ft. of line set
- 24" two-blade Swept Wing fan with 1/6 HP motor
- 3/8" liquid and 3/4" 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)
RH1AY3621STANNJ Single-Stage Air Handler
- Single-stage airflow with a constant torque (ECM) motor
- Multi-speed motor with 10" x 10" blower in a 21" cabinet
- 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 15 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
How is the RH1AY3621STANNJ different from the RH1AY3617STANNJ?
Both are 3 ton, 42.5" tall RH1AY air handlers. The 3621 is 21" wide and the 3617 is 17.5" wide. Choose the one that matches your existing opening, or see the RA14AY36AJ1NA, RH1AY3617STANNJ system.
Why pick a 21" air handler for a 3 ton system?
A 21" cabinet lines up with existing 21" supply plenums, return drops and platforms. That avoids adding a transition and keeps the install cleaner when replacing a 21" unit.
How much airflow does the RH1AY3621STANNJ move at 3 tons?
Rheem's airflow table for the 3621 at 3 tons on the high speed tap lists about 1,174 CFM at 0.3" and 1,099 CFM at 0.5" of external static pressure, dry coil with no filter.
What is the RH1AY3621STANNJ's shipping weight?
Rheem lists a 111 lb unit weight and a 126 lb shipping weight, a bit heavier than the 17.5" RH1AY3617.
Which floor base does the RH1AY3621 need for downflow?
For a downflow install on a combustible floor, use Rheem's RXHB-21 combustible floor base, sized for the 21" cabinet.
What refrigerant line connections does the RH1AY3621STANNJ have?
It has 3/8" liquid and 3/4" vapor sweat connections, matching the service valves on the RA14AY36AJ1NA condenser.
RA14AY Technical SpecificationsRA14AY Installation InstructionsRA14AY BrochureRH1AY Technical SpecificationsRH1AY Installation InstructionsRheem Warranty Certificate
