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)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- Signature Series Cooling-Only Condenser (MCAESAS4T1821AA)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- AHRI Certificate (PDF)
- EnergyGuide (PDF)
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.
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We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
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