MRCOOL® Signature Series 48K (4 Ton) Heat Pump System — MCAEAMPEF48E21AA + MCAESHS4T4821AA
Overview
The MRCOOL® Signature Series 48K heat pump system pairs a 4-ton multi-position air handler with a split-system heat pump condenser for year-round heating and cooling. The indoor unit supports upflow, downflow, and horizontal installs, and both components use R-454B refrigerant.
Highlights
- All-season comfort: Heat pump condenser listed for heating + cooling.
- Efficiency ratings: Outdoor unit listed at 14.3 SEER2, 11.2 EER2, and 7.5 HSPF2.
- Flexible installation: Air handler supports upflow, downflow, and horizontal configurations.
- Service-friendly pairing: Outdoor unit lists 150 ft maximum line set length for flexible placement.
- Cold-weather note: Outdoor unit lists 5°F minimum ambient heating operation.
4 Ton (48K Class)
14.3 SEER2 • 7.5 HSPF2
3/8" Liquid • 7/8" Suction
Up to 150 ft
Performance varies by climate and installation. Manual J sizing is recommended.
What’s Included
- Multi-Position Air Handler: MCAEAMPEF48E21AA
- Heat Pump Condenser: MCAESHS4T4821AA
- Documentation (see Documents & Downloads)
Indoor Specs
Model: MCAEAMPEF48E21AA (Signature Series Multi-Position Air Handler)
| Unit Type | Air Handler |
| Configuration / Mount | Multi-Position (Upflow / Downflow / Horizontal) |
| Tonnage | 4 Ton |
| Airflow (CFM) | 1549 |
| Sound | 57 dB(A) |
| Refrigerant | R-454B |
| Metering Device | Orifice |
| Drain Connection Size | 3/4" |
| Line Sizes | Liquid 3/8" • Suction 7/8" |
| Blower Motor Type | ECM |
| Blower Motor | 3/4 HP • 5 Speeds • 1010 RPM |
| Filter | Replaceable • 20" × 24" × 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) | 22" × 24.5" × 53.125" |
| Net Weight | 163 lb |
| GTIN / UPC | GTIN 00840255595896 • UPC 840255595896 |
| Proposition 65 | Yes |
Designed to work with Signature Series top discharge condensers.
Outdoor Specs
Model: MCAESHS4T4821AA (Signature Series Split System Heat Pump Condenser)
| Unit Type | Split System Heat Pump Condenser |
| Tonnage | 4 Ton |
| Cooling / Heating Capacity | 45,000 BTU / 45,000 BTU |
| Efficiency | 14.3 SEER2 • 11.2 EER2 • 7.5 HSPF2 |
| Airflow (CFM) | 4000 |
| Sound | 65 dB(A) |
| Inverter | No |
| Min Ambient (Cooling) | 59°F |
| Min Ambient (Heating) | 5°F |
| Refrigerant | R-454B • 144.6 oz |
| Max Line Set Length | 150 ft |
| Line Sizes | Liquid 3/8" • Suction 3/4" |
| Compressor | Scroll |
| Condenser Fan Motor | PSC • 1/3 HP |
| Electrical | 208/230V • 1-Phase • 60 Hz |
| Min Circuit Ampacity (MCA) | 30A |
| Max Fuse / Breaker | 50A |
| Certifications | UL Listed • CSA Listed • ETL Listed • AHRI Certified |
| Color | Grey |
| Dimensions (W×D×H) | 29.14" × 29.14" × 32.875" |
| Net Weight | 223 lb |
| GTIN / UPC | GTIN 00840255595827 • UPC 840255595827 |
| Proposition 65 | Yes |
Designed to work with Signature Series Multi-Position or Stud Mount air handlers.
Documents & Downloads
- Signature Series Multi-Position Air Handler (MCAEAMPEF48E21AA)
- Signature Series Heat Pump Condenser (MCAESHS4T4821AA)
Important
- Heat pump operation: This pairing includes a heat pump condenser for heating + cooling.
- Minimum outdoor temps: Outdoor unit lists 59°F minimum ambient for cooling and 5°F minimum ambient for heating.
- Line sizes: Air handler lists 3/8" liquid and 7/8" suction. Outdoor unit lists 3/8" liquid and 3/4" suction. Verify the correct suction line size for the matched pairing in the installation manual before ordering line sets.
- Line set length: Outdoor unit lists up to 150 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, and 10 kW) for added cold-weather comfort (sold separately).
FAQs
Does this system provide heating and cooling?
Yes. The outdoor unit is a heat pump condenser, so the system is listed for both heating and cooling.
What installation positions does the air handler support?
The air handler is multi-position and supports upflow, downflow, and horizontal configurations.
What refrigerant does it use?
Both components list R-454B.
What line sizes should I use?
Liquid line is listed as 3/8". Suction line sizing shows a mismatch between the indoor (7/8") and outdoor (3/4") fields provided, so confirm the correct suction line size for the matched pairing in the installation manual before selecting a line set.
How cold can it run in heating?
The outdoor unit lists a minimum ambient heating temperature of 5°F.
What warranty coverage is included?
Warranty is listed as 10-year limited parts, with limited lifetime compressor coverage referenced for the outdoor unit.
