MRCOOL — Signature Series Split System (Air Handler + Cooling-Only Condenser)
MRCOOL® Signature Series 42K (3.5 Ton) Split AC System — MCAEAMPEF42C21AA + MCAESAS4T4221AA
Overview
42K Class3.5 TonUp to 14.3 SEER211.7 EER2R-454BCooling OnlyMulti-Position Air HandlerUpflow / Downflow / HorizontalECM BlowerAHRI Certified10-Year Parts Warranty
TheMRCOOL® Signature Series 42Ksplit system pairs amulti-position air handlerwith acooling-only condenserfor dependable, energy-conscious cooling. The air handler supportsupflow, downflow, and horizontalconfigurations and uses a high-efficiencyECM blower motorfor strong airflow and efficient comfort delivery. Both components useR-454B refrigerantfor a modern, low-GWP refrigerant platform.
Highlights
- Multi-position install:Air handler supportsupflow, downflow, and horizontalconfigurations for flexible layouts.
- ECM comfort control:High-efficiencyECM blower(5 speeds) supports strong airflow and better comfort control.
- Efficient cooling:Condenser rated14.3 SEER2and11.7 EER2.
- Quiet-minded design:Outdoor unit listed at65 dB(A)with a sound-dampening top.
- Long-line capable:Condenser lists up to150 ftmaximum line set length.
System Size
3.5 Ton (42K Class)
3.5 Ton (42K Class)
Airflow
1254 CFM (Indoor)
1254 CFM (Indoor)
Line Sizes
3/8" Liquid • 3/4" Suction
3/8" Liquid • 3/4" Suction
Max Line Set
150 ft
150 ft
Sizing and performance depend on installation, duct design, and load. Manual J sizing is recommended.
What’s Included
- Multi-Position Air Handler:MCAEAMPEF42C21AA
- Cooling-Only Condenser:MCAESAS4T4221AA
- Documentation (see Documents & Downloads)
Indoor Specs
Model:MCAEAMPEF42C21AA (Signature Series Multi-Position Air Handler)
| Unit Type | Air Handler |
| Configuration / Mount | Multi-Position (Upflow / Downflow / Horizontal) |
| Tonnage | 3.5 Ton |
| Airflow (CFM) | 1254 |
| Sound | 54 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 | 3/4 HP • 5 Speeds • 1040 RPM |
| Filter | Replaceable • 18" × 21" × 1" |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 7.2A |
| Max Fuse / Breaker | 10A |
| 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) | 19.625" × 22" × 45.75" |
| Net Weight | 131 lb |
| GTIN / UPC | GTIN 00840255595889 • UPC 840255595889 |
| Proposition 65 | Yes |
Designed to work withSignature Series top discharge condensersand most third-party thermostats.
Outdoor Specs
Model:MCAESAS4T4221AA (Signature Series Split System AC Condenser — Cooling Only)
| Unit Type | Split System AC Condenser (Cooling Only) |
| Tonnage | 3.5 Ton |
| Cooling Capacity | 39,000 BTU |
| Efficiency | 14.3 SEER2 • 11.7 EER2 |
| Airflow (CFM) | 2950 |
| Sound | 65 dB(A) |
| Inverter | No |
| Min Ambient Cooling | 59°F |
| Refrigerant | R-454B • 114.6 oz |
| Max Line Set Length | 150 ft |
| Line Sizes | Liquid 3/8" • Suction 3/4" |
| Compressor | Scroll |
| Condenser Fan Motor | PSC • 1/7 HP |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 26A |
| Max Fuse / Breaker | 45A |
| Certifications | UL Listed • CSA Listed • ETL Listed • AHRI Certified |
| Color | Grey |
| Dimensions (W×D×H) | 29.14" × 29.14" × 32.875" |
| Net Weight | 185 lb |
| GTIN / UPC | GTIN 00840255595957 • UPC 840255595957 |
| Proposition 65 | Yes |
Designed to work withSignature Series Multi-PositionorStud Mountair handlers.
Documents & Downloads
- Signature Series Multi-Position Air Handler (MCAEAMPEF42C21AA)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- Signature Series Cooling-Only Condenser (MCAESAS4T4221AA)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- AHRI Certificate (PDF)
- EnergyGuide (PDF)
Important
- Cooling-only outdoor unit:This condenser is listed ascooling only. If you need heating via outdoor equipment, select a compatible heat pump condenser instead.
- Line sizes:Listed as3/8" liquidand3/4" suction; confirm routing and any long-line requirements in the installation manual.
- Line set length:Condenser lists up to150 ftmaximum line set length; verify long-line accessories/requirements in the install manual.
- Electrical:Both components are208/230V, 1-phase, 60 Hz. Verify breaker/fuse sizing per install manual and local code.
- Air handler orientation:Supportsupflow, downflow, and horizontalinstallation; configure condensate management for the selected position.
- Optional heat kits:Supported sizes listed as5 kW,7.5 kW, and10 kW(sold separately).
FAQs
Is this a heat pump system?
No. The outdoor unit in this pairing is acooling-onlycondenser. Heating requires a different outdoor unit (heat pump) or an indoor heat source such as an optional electric heat kit.
What installation positions does the air handler support?
The air handler ismulti-positionand supportsupflow, downflow, and horizontalconfigurations.
What refrigerant and line sizes does it use?
Refrigerant is listed asR-454B. Line sizes are3/8" liquidand3/4" suction.
What is the maximum line set length?
The condenser lists a maximum line set length of150 ft.
What warranty coverage is included?
Warranty is listed as10-year limited parts, withlimited compressorcoverage referenced for the outdoor unit.
