MRCOOL® Signature Series 18K (1.5 Ton) Split AC System — MCAEAMPSF18C21AA + MCAESAS4T1821AA
Overview
This MRCOOL® Signature Series 18K split system pairs a multi-position air handler with a cooling-only condenser for dependable comfort and straightforward installation. Both components use R-454B refrigerant for a modern, lower-impact refrigerant platform. The air handler supports upflow, downflow, and horizontal configurations for flexible placement in closets, attics, and crawl spaces, while the condenser delivers efficient, quiet cooling for residential applications.
Highlights
- Flexible installation: Multi-position air handler supports upflow, downflow, and horizontal configurations.
- Efficient cooling: Condenser rated up to 14.3 SEER2 and 11.7 EER2.
- Modern refrigerant: R-454B refrigerant platform.
- Durable construction: Galvanized steel cabinet and copper “A” coils with high-efficiency aluminum fins.
- Quiet outdoor operation: Outdoor unit listed at 60 dB(A).
1.5 Ton (18K Class)
Up to 14.3 SEER2
3/8" Liquid • 3/4" Suction
100 ft
Sizing and performance depend on installation, duct design, and load. Manual J sizing is recommended.
What’s Included
- Multi-Position Air Handler: MCAEAMPSF18C21AA
- Cooling-Only Condenser: MCAESAS4T1821AA
- Documentation (see Documents & Downloads)
Indoor Specs
Model: MCAEAMPSF18C21AA (Signature Series Multi-Position Air Handler)
| Unit Type | Air Handler |
| Configuration / Mount | Multi-Position (Upflow / Downflow / Horizontal) |
| Tonnage | 1.5 Ton |
| Airflow (CFM) | 749 |
| 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 | PSC |
| Blower Motor | 1/4 HP • 3 Speeds • 830 RPM |
| Filter | Replaceable • 18" × 21" × 1" |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 2.1A |
| Max Fuse / Breaker | 3A |
| Aux Heat | Not included • Optional heat kit available (5 kW, 7.5 kW) |
| Certifications | UL Listed • CSA Listed • ETL Listed • AHRI Certified |
| Color | Grey |
| Dimensions (W×D×H) | 19.625" × 22" × 45.75" |
| Net Weight | 120 lb |
| GTIN / UPC | GTIN 00840255595841 • UPC 840255595841 |
| Proposition 65 | Yes |
This air handler is designed to work with Signature Series top discharge condensers and supports most third-party thermostats.
Outdoor Specs
Model: MCAESAS4T1821AA (Signature Series Split System AC Condenser — Cooling Only)
| Unit Type | Split System AC Condenser (Cooling Only) |
| 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 |
This condenser is designed to work with Signature Series Multi-Position or Stud Mount air handlers.
Documents & Downloads
- Signature Series Multi-Position Air Handler (MCAEAMPSF18C21AA)
- Signature Series Cooling-Only Condenser (MCAESAS4T1821AA)
Important
- Matched system: Air handler and condenser should be paired per approved combinations for rated performance and certification.
- Line sizes: Listed as 3/8" liquid and 3/4" suction; confirm sizing and routing requirements in the installation manual.
- Electrical: Both units are 208/230V, 1-phase, 60 Hz. Verify breaker/fuse sizing per installation manual and local code.
- Air handler orientation: Supports upflow, downflow, and horizontal installation—ensure condensate management is configured correctly for the chosen position.
- Optional heat: Air handler supports optional electric heat kits (5 kW, 7.5 kW) when additional heat is desired.
FAQs
Is this a heat pump system?
No. The outdoor unit listed here is a cooling-only condenser. Heating would require a compatible heat source (such as an optional electric heat kit in the air handler) or a different outdoor unit.
What installation positions does the air handler support?
The air handler is multi-position and supports upflow, downflow, and horizontal configurations.
What are the refrigerant and line sizes?
Refrigerant is listed as R-454B. Line sizes are listed as 3/8" liquid and 3/4" suction.
What is the maximum line set length?
The condenser lists a maximum line set length of 100 ft.
What warranty coverage is included?
Warranty is listed as a 10-year limited parts warranty, with limited lifetime compressor warranty coverage referenced for the outdoor unit.
