MRCOOL® Signature Series 18K AC System (Stud Mount) — MCAEAWPEF18D21AA + MCAESAS4T1821AA
Overview
This pairing combines the MRCOOL® Signature Series 18K stud mount air handler with a Signature Series cooling-only condenser for efficient, quiet residential cooling. The stud mount cabinet is designed to fit between standard wall studs and supports front or bottom return configurations for flexible installs.
Highlights
- Between-stud installation: Space-saving stud mount design for tight installations.
- Flexible return air: Front or bottom return options to match your layout.
- Efficient airflow: ECM blower motor with multi-speed control for consistent comfort.
- Quiet operation: Outdoor unit lists 60 dB(A) sound rating.
- R-454B refrigerant platform: Modern, low-GWP refrigerant system.
1.5 Ton (18K Class)
14.3 SEER2 • 11.7 EER2
3/8" Liquid • 3/4" Suction
Up to 100 ft
Sizing and performance depend on home load and installation details.
What’s Included
- Stud Mount Air Handler: MCAEAWPEF18D21AA
- AC Condenser (Cooling Only): MCAESAS4T1821AA
- Documentation (see Documents & Downloads)
Indoor Specs
Model: MCAEAWPEF18D21AA (Signature Series Stud Mount Air Handler)
| Unit Type | Air Handler |
| Configuration / Mount | Stud Mount |
| Airflow Direction | Upflow |
| Tonnage | 1.5 Ton |
| Airflow (CFM) | 685 |
| Sound | 53 dB(A) |
| Refrigerant | R-454B |
| Metering Device | Orifice |
| Drain Connection Size | 3/4" |
| Line Sizes | Liquid 3/8" • Suction 3/4" |
| Blower Motor Type | ECM |
| Blower Motor | 1/3 HP • 5 Speeds • 960 RPM |
| Filter | Replaceable • 15" × 19" × 1" |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 2.5A |
| Max Fuse / Breaker | 3A |
| Aux Heat | Not included • Optional heat kit available (5 kW, 7.5 kW, 10 kW) |
| Certifications | UL Listed • CSA Listed • ETL Listed • AHRI Certified |
| Color | Grey |
| Dimensions (W×D×H) | 20.5" × 15" × 36" |
| Net Weight | 88 lb |
| GTIN / UPC | GTIN 00840255595919 • UPC 840255595919 |
| Proposition 65 | Yes |
Designed to work with Signature Series top discharge condensers.
Outdoor Specs
Model: MCAESAS4T1821AA (Signature Series Split System AC Condenser — Cooling Only)
| Unit Type | Split System AC Condenser |
| Tonnage | 1.5 Ton |
| Cooling Capacity | 17,000 BTU |
| Efficiency | 14.3 SEER2 • 11.7 EER2 |
| Airflow (CFM) | 1950 |
| Sound | 60 dB(A) |
| Inverter | No |
| Min Ambient (Cooling) | 59°F |
| Refrigerant | R-454B • 74 oz |
| Max Line Set Length | 100 ft |
| Line Sizes | Liquid 3/8" • Suction 3/4" |
| Compressor | Scroll |
| Condenser Fan Motor | PSC • 1/9 HP |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 12.2A |
| Max Fuse / Breaker | 20A |
| Certifications | UL Listed • CSA Listed • ETL Listed • AHRI Certified |
| Color | Grey |
| Dimensions (W×D×H) | 23.6" × 23.6" × 25" |
| Net Weight | 132 lb |
| GTIN / UPC | GTIN 00840255595711 • UPC 840255595711 |
| Proposition 65 | Yes |
Designed to work with Signature Series multi-position or stud mount air handlers.
Documents & Downloads
- Signature Series Stud Mount Air Handler (MCAEAWPEF18D21AA)
- Signature Series AC Condenser (MCAESAS4T1821AA)
Important
- Cooling-only system: This condenser is listed as air conditioner (no heat pump). Heating requires a separate heat source or optional accessories per your design.
- Stud mount configuration: Designed to fit between studs; supports front and bottom return air (verify clearances in the install manual).
- Line sizes: Both components list 3/8" liquid and 3/4" suction.
- Line set length: Outdoor unit lists up to 100 ft maximum line set length; verify long-line requirements in the install manual.
- Electrical: Both components are 208/230V, 1-phase, 60 Hz. Verify breaker/fuse sizing per install manual and local code.
- Aux heat option: Air handler supports optional heat kits (listed as 5 kW, 7.5 kW, 10 kW) for added heat when designed into the system (sold separately).
FAQs
What is a stud mount air handler?
A stud mount air handler is designed to fit between standard wall studs, helping solve installations where a traditional cabinet won’t fit in a closet or utility space.
Does this system provide heating?
No. The outdoor unit is a cooling-only AC condenser. It provides air conditioning when paired with this air handler.
What refrigerant does it use?
Both components list R-454B.
What is the maximum line set length?
The outdoor unit lists up to 100 ft maximum line set length.
What warranty coverage is included?
Warranty is listed as 10-year limited parts, with limited lifetime compressor coverage referenced for the outdoor unit.
