Ruud / Contractor equipment reference
Specifications, submittals and job-planning resources for the Endeavor® Line Ultra™ Series R-454B side-discharge heat pump.
Plan the equipment around the job
For contractors comparing a replacement or a new ducted system, RD18AY combines a narrow outdoor cabinet with inverter-driven operation. Start with the load, the indoor equipment and the installation space, then choose the outdoor model and controls.
Compare cabinet dimensions by capacity. Then review the clearance drawings for the proposed walls, discharge path, service access and nearby units. A cabinet that fits the pad may still need a different installation location.
Ruud’s universal-replacement guidance specifies an R-454B indoor coil with a TXV and suitable indoor airflow. “Universal” does not authorize reconnecting any existing coil or skipping the applicable A2L requirements.
EcoNet communicating-system features depend on the complete equipment combination. Non-communicating installations use the prescribed wiring and configuration. Establish the control approach before choosing accessories or promising operating features.
The numbers contractors need
Compare manufacturer-listed models, or focus the chart on one full model number.
Showing four manufacturer-listed models. Confirm current availability with Mar-Hy.
| Product specification | RD18AY24AJVCA2-ton nominal | RD18AY36AJVCA3-ton nominal | RD18AY48AJVCA4-ton nominal | RD18AY60AJVCA5-ton nominal |
|---|---|---|---|---|
| Manufacturer model | RD18AY24AJVCA | RD18AY36AJVCA | RD18AY48AJVCA | RD18AY60AJVCA |
| Nominal size | 2 tons · 24,000 Btu/h size class | 3 tons · 36,000 Btu/h size class | 4 tons · 48,000 Btu/h size class | 5 tons · 60,000 Btu/h size class |
| Refrigerant | R-454B | R-454B | R-454B | R-454B |
| Power supply | 208/230 V · 1 phase · 60 Hz | 208/230 V · 1 phase · 60 Hz | 208/230 V · 1 phase · 60 Hz | 208/230 V · 1 phase · 60 Hz |
| Compressor | Inverter-driven single rotary | Inverter-driven twin rotary | Inverter-driven twin rotary | Inverter-driven twin rotary |
| Cabinet H × L × W (in.) | 36.6 × 40.4 × 19.8 | 46.4 × 42.3 × 22.8 | 58.0 × 40.4 × 19.8 | 58.0 × 40.4 × 19.8 |
| Liquid valve connection O.D. (in.) | 3/8 | 3/8 | 3/8 | 3/8 |
| Vapor valve connection O.D. (in.) | 3/4 | 3/4 | 7/8 | 7/8 |
| Minimum circuit ampacity (A) | 19 | 26 | 38 | 43 |
| Maximum overcurrent protection (A) | 20 | 30 | 40 | 45 |
| Operating weight (lb) | 177 | 230 | 296 | 306 |
| Sound pressure, as low as (dBA) | 53 | 50 | 54 | 55 |
| Sound power, as low as (dBA) | 61 | 58 | 61 | 63 |
Source: Ruud P22-843 Rev. 2, pages 3–7; dimensions also shown in X33-1676 Rev. 1, page 3. Technical-document dimensions are used here rather than general marketing footprint descriptions. Reference reviewed November 10, 2026.
Use the outdoor model to start the selection. Use the complete listed indoor/outdoor combination to establish the system rating.
Read it. Save it. Bring it to the job.
Open the manufacturer document you need. PDFs download only when selected.
Find RD18AY installation instructions and additional references in the document library
Match the complete model, document revision and application. The installation instructions supplied with the equipment govern the actual installation. Manufacturer documents can be revised after this review.
Get a useful quote on the first conversation
First identify the coil’s full model, refrigerant application, TXV, airflow and required controls. Ruud’s stated universal-replacement scope calls for an R-454B coil with a TXV. The family name does not clear an R-410A coil or establish a rated equipment combination.
No. The model chart shows different cabinet dimensions and electrical requirements. The specification footnote identifies the 2-ton unit as single rotary; the larger sizes use twin rotary compressors. Use the full model number rather than assuming that one family image describes every cabinet.
Ruud lists a 10-year conditional parts warranty with registration required, subject to the applicable warranty terms and eligibility. Do not treat that statement as blanket labor coverage or coverage for another manufacturer’s indoor equipment. Review the warranty card and registration requirements for the actual installation.
Use the applicable installation instructions and manufacturer setup procedure for clearances, line sizing, controls, airflow, A2L requirements and startup. For additional planning context, read our RD18 installation-planning article or check the Mar-Hy contractor training schedule.
Find it at Mar-Hy
Use the existing shop listings below, or ask our team to confirm sourcing, current contractor pricing and availability. Mar-Hy serves HVAC contractors in Oregon and Southwest Washington from Milwaukie.
RD18AY24AJVCA
View 2-ton shop listingConfirm current price and availability in the store.
Find 2-ton AHRI referencesRD18AY36AJVCA
View 3-ton shop listingConfirm current price and availability in the store.
Find 3-ton AHRI referencesRD18AY48AJVCA
Ask about 4-ton sourcingManufacturer family reference; confirm sourcing with Mar-Hy.
Find 4-ton AHRI referencesRD18AY60AJVCA
Ask about 5-ton sourcingManufacturer family reference; confirm sourcing with Mar-Hy.
Find 5-ton AHRI referencesSearch the RD18AY literature collection
Explore Ruud equipment through Mar-Hy
View Mar-Hy’s featured heat pump
View Ruud’s RD18AY product page
Find Ruud registration resources