MRCOOL — Signature Series (Stud Mount Air Handler + Heat Pump Condenser)
MRCOOL® Signature Series 18K Heat Pump System (Stud Mount) — MCAEAWPEF18D21AA + MCAESHS4T1821AA
Overview
18K Class1.5 TonHeat PumpStud Mount Air HandlerBetween-Stud InstallECM Blower14.3 SEER211.7 EER27.5 HSPF2R-454BAHRI Certified10-Year Parts Warranty
This system pairs theMRCOOL® Signature Series 18K stud mount air handlerwith theSignature Series 1.5-ton heat pump condenserfor year-round heating and cooling. The stud mount air handler is designed tofit between standard wall studsand supportsfront or bottom returnoptions to match the installation space.
Highlights
- Space-saving stud mount:Designed forbetween-studinstallation where traditional air handlers won’t fit.
- Flexible return air:Air handler supportsfrontorbottomreturn configurations.
- Efficient airflow:Air handler uses ahigh-efficiency ECM blowerfor steady airflow and energy savings.
- All-season performance:Heat pump condenser is listed forheating + cooling, with5°Fminimum ambient heating operation.
- Installer-friendly:Outdoor unit listssweat connection service valvesand an accessiblegauge port.
System Size
1.5 Ton (18K Class)
1.5 Ton (18K Class)
Efficiency
14.3 SEER2 • 7.5 HSPF2
14.3 SEER2 • 7.5 HSPF2
Line Sizes
3/8" Liquid • 3/4" Suction
3/8" Liquid • 3/4" Suction
Min Ambient
5°F Heat • 59°F Cool
5°F Heat • 59°F Cool
Performance varies by climate and installation. Manual J sizing is recommended.
What’s Included
- Stud Mount Air Handler:MCAEAWPEF18D21AA
- Heat Pump Condenser:MCAESHS4T1821AA
- 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 withSignature Series top discharge condensers.
Outdoor Specs
Model:MCAESHS4T1821AA (Signature Series Split System Heat Pump Condenser)
| Unit Type | Split System Heat Pump Condenser |
| Tonnage | 1.5 Ton |
| Cooling / Heating Capacity | 17,000 BTU / 17,000 BTU |
| Efficiency | 14.3 SEER2 • 11.7 EER2 • 7.5 HSPF2 |
| Airflow (CFM) | 1950 |
| Sound | 60 dB(A) |
| Inverter | No |
| Min Ambient (Cooling) | 59°F |
| Min Ambient (Heating) | 5°F |
| Refrigerant | R-454B • 81.1 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 | 144 lb |
| GTIN / UPC | GTIN 00840255595773 • UPC 840255595773 |
| Proposition 65 | Yes |
Designed to work withSignature Series multi-positionorstud mountair handlers.
Documents & Downloads
- Signature Series Stud Mount Air Handler (MCAEAWPEF18D21AA)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- Signature Series Heat Pump Condenser (MCAESHS4T1821AA)
- Brochure (EN)
- Installation & User Manual (EN)
- Warranty (EN)
- AHRI Certificate (PDF)
- EnergyGuide (PDF)
Important
- Stud mount configuration:Designed to fit between studs; supportsfrontandbottomreturn air configurations (verify clearances in the install manual).
- Line sizes:Both components list3/8" liquidand3/4" suction.
- Line set length:Outdoor unit lists up to100 ftmaximum line set length; verify long-line requirements in the install manual.
- Minimum outdoor temps:Outdoor unit lists59°Fminimum ambient for cooling and5°Fminimum ambient for heating.
- Electrical:Both components are208/230V, 1-phase, 60 Hz. Verify breaker/fuse sizing per install manual and local code.
- Aux heat option:Air handler supports optional heat kits (listed as5 kW,7.5 kW,10 kW) for added cold-weather comfort (sold separately).
FAQs
What is a stud mount air handler?
A stud mount air handler is designed tofit between standard wall studs, helping solve installs where a traditional cabinet won’t fit in a closet/utility space.
Does this system provide heating and cooling?
Yes. The outdoor unit is aheat pump condenser, so the system is listed forheating and cooling.
What refrigerant does it use?
Both components listR-454B.
How cold can it run in heating?
The outdoor unit lists a minimum ambient heating temperature of5°F.
What warranty coverage is included?
Warranty is listed as10-year limited parts, withlimited compressorcoverage referenced for the outdoor unit.
