This is the outdoor condenser (outdoor unit) only for a Carrier Infinity 27 single-zone mini split heat pump system — model 37MAHAQ12AA3, 12,000 BTU/h size. It's for homeowners or contractors who already have (or are separately sourcing) a matched Carrier indoor head, line set, and installation accessories. This listing does not include an indoor unit, line set, or any mounting accessories.
The 37MAHAQ12AA3 is the outdoor condensing unit for Carrier's Infinity 27 single-zone ductless heat pump line, rated at 12,000 BTU/h cooling with a variable-speed (inverter-driven) compressor. It carries ENERGY STAR® certification and is rated at 25.5 SEER2 / 10.5 HSPF2 (IV) in its AHRI-matched system configuration. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
System Components
- Outdoor condenser: Carrier 37MAHAQ12AA3 (family 37MAHA), 12,000 BTU/h size, variable-speed compressor, R-454B (Puron Advance™) refrigerant
- Indoor unit: sold separately — not included in this listing. Confirm an AHRI-matched Carrier indoor head before ordering.
Installation Requirements & Accessories
- Power supply: 208/230V; 1-phase; 60Hz — this is a 208/230V circuit, not a 115V circuit
- Minimum Circuit Ampacity (MCA): 15A; Maximum Overcurrent Protection (MOP): 15A
- Liquid line: 1/4 in (6.35mm); Suction line: 3/8 in (9.52mm)
- Line set sold separately — not included with this outdoor unit
- Not included: indoor head, wall sleeve, mounting bracket, disconnect box, condensate drain accessories
- Not compatible with 115V-only circuits
- Not a listed match for indoor units outside Carrier's AHRI-certified 37MAHA family combinations
- Professional installation required — this is not a pre-charged DIY kit
Pro-Installer Tip
Flare connections on R-454B systems are unforgiving of shortcuts. A flare nut torqued by feel instead of spec is the single most common cause of a slow refrigerant leak that shows up months later as reduced capacity or a communication fault between indoor and outdoor boards. Use a digital torque wrench set to the manufacturer's flare torque spec and re-check the joint after initial system startup, once line pressures have stabilized. Evacuate the line set to the manufacturer's specified vacuum level before opening the service valves — do not skip straight to a nitrogen sniff test. Under EPA Section 608, only certified technicians may handle refrigerant charging and recovery on this system, and R-454B's A2L (mildly flammable) classification means brazing and leak-check procedures must follow the manufacturer's installation instructions exactly.
Key Benefits
- Variable-speed inverter compressor for steady, efficient temperature control rather than on/off cycling
- Up to 25.5 SEER2 cooling efficiency and 10.5 HSPF2 (IV) heating efficiency in this size, ENERGY STAR® certified
- Outdoor sound pressure as low as 56 dB(A) at this size
- Puron Advance™ (R-454B) refrigerant — 75% lower global warming potential than legacy refrigerants, non-ozone-depleting
- Cooling operating range down to -22°F / up to 122°F ambient
- Compatible with Carrier's Consumer Choice Warranty program upon timely registration of the matched system
| Spec | Value | Unit |
|---|---|---|
| Component Role | Outdoor Condenser (Outdoor Unit Only) | — |
| Cooling Capacity (DOE A2 - 95°F) | 12000 | BTU/h |
| Heating Capacity (DOE H12 - 47°F) | 12000 | BTU/h |
| Heating Capacity (DOE H32 - 17°F) | 9800 | BTU/h |
| SEER2 | 25.5 | Btu/h.W |
| EER2 (DOE A2 - 95°F) | 13.5 | Btu/h.W |
| HSPF2 IV | 10.5 | Btu/h.W |
| HSPF2 V | 8 | Btu/h.W |
| Voltage | 208/230V;1Ph;60Hz | — |
| MCA (Minimum Circuit Ampacity) | 15 | A |
| MOP (Maximum Overcurrent Protection) | 15 | A |
| Outdoor Sound Pressure Level | 56 | dBA |
| Net Weight | 72.75 | lbs |
| Refrigerant Type | R-454B | — |
| Liquid Line Size | 1/4 (6.35mm) | in |
| Suction Line Size | 3/8 (9.52mm) | in |
| Cooling Operating Range | -22 to 122 (-30 to 55) | °F (°C) |
| Zone Count | 1 (Single-Zone) | — |
| DIY Status | No — Professional Installation Required | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Matches Carrier's AHRI-certified 37MAHA family combinations when paired with a compatible Carrier indoor head — confirm the exact indoor model with Carrier documentation before ordering, as the specific matched indoor model number was not included in the source data for this listing
- Requires a dedicated 208/230V; 1-phase; 60Hz circuit — not compatible with 115V-only circuits
- Line set connections: 1/4 in (6.35mm) liquid, 3/8 in (9.52mm) suction — confirm against the selected indoor unit's fitting sizes
- Line set is NOT included — must be purchased separately and rated for R-454B refrigerant
- Indoor unit, wall sleeve, mounting bracket, and condensate accessories are NOT included in this listing
- Not a listed match for indoor units outside the 37MAHA-compatible AHRI combinations
FAQ
What breaker size do I need for this system?
The 37MAHAQ12AA3 outdoor unit has a Minimum Circuit Ampacity (MCA) of 15A and a Maximum Overcurrent Protection (MOP) of 15A, on a dedicated 208/230V, 1-phase, 60Hz circuit.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. It uses R-454B refrigerant (A2L, mildly flammable classification) and requires professional installation by a licensed HVAC technician holding EPA Section 608 certification.
Is the line set included, and if not, what size do I need to buy?
No line set is included with this outdoor unit. For the 37MAHAQ12AA3, the liquid line is 1/4 in (6.35mm) and the suction line is 3/8 in (9.52mm). Line set length and total run must be confirmed against the specific installation.
Does this system work in cold climates (low-ambient heating)?
The published cooling operating range for this outdoor unit is -22°F to 122°F (-30°C to 55°C). At the DOE H32 (17°F) test condition, this model's rated heating capacity is 9,800 Btu/h.
What indoor unit does this outdoor unit pair with?
[NEEDS VERIFICATION] — the manufacturer data provided does not list a specific matched indoor model number for the 37MAHAQ12AA3 AHRI rating. Confirm indoor unit compatibility with Carrier documentation before ordering.
Compliance & Warranty
This outdoor unit uses R-454B (A2L, mildly flammable) refrigerant and must be installed by a licensed HVAC professional holding EPA Section 608 certification. Installation by a licensed HVAC professional is required to maintain warranty. Under Carrier's Consumer Choice Warranty, upon timely registration on eligible equipment, you can select either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty. Confirm exact warranty terms and registration deadlines in the manufacturer documentation referenced above.
