This is the outdoor condenser unit only for a Carrier Infinity 27 single-zone ductless heat pump system. It's built 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 those components.
The 37MAHAQ09AA3 is the outdoor half of a Carrier Infinity 27 single-zone ductless heat pump system, rated at 9,000 BTU/h cooling with a 27.5 SEER2 efficiency rating when matched to the correct Infinity-series indoor head in an AHRI-certified combination. This unit uses a variable-speed (inverter-driven) compressor and Puron Advance™ (R-454B) refrigerant. 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 Infinity 27, model 37MAHAQ09AA3 (family 37MAHA, size 09K)
- Indoor unit: NOT included — must be purchased separately and matched per Carrier's AHRI-certified combination charts
Installation Requirements & Accessories
- Voltage: 208/230V; 1-Phase; 60Hz (dedicated circuit)
- MCA: 15A / MOP: 15A
- Liquid line: 1/4 in (6.35mm); Suction line: 3/8 in (9.52mm) — Line Set Sold Separately
- Refrigerant: R-454B (A2L mildly flammable classification) — professional installation required
- Not included: indoor head, line set, wall sleeve/mounting bracket, disconnect, and low-voltage wiring
- Not compatible with 115V-only circuits
- Not a listed match for non-Infinity or unmatched Carrier indoor model families — verify AHRI-certified pairing before ordering
Pro-Installer Tip
Flare connections on R-454B systems are unforgiving of shortcuts — an under-torqued or scored flare face is the single most common cause of a slow refrigerant leak that shows up months later as reduced capacity or a compressor fault. Torque every flare nut to the fitting manufacturer's spec using a calibrated digital torque wrench rather than "feel," and always deburr and re-face the copper with a proper flaring tool before assembly. This isn't optional on A2L refrigerants — evacuate the line set thoroughly before charging, and remember that anyone touching R-454B refrigerant circuits needs current EPA Section 608 certification.
Key Benefits
- Variable-speed inverter compressor for steadier temperature control, not just on/off cycling
- Up to 27.5 SEER2 cooling efficiency at this size (09K), ENERGY STAR® certified
- Outdoor sound pressure as low as 56 dBA at this size
- Puron Advance™ (R-454B) refrigerant — lower global warming potential than legacy refrigerants
- Rated heating output maintained down to 5°F ambient (11,500 Btu/h at ODE H42)
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Outdoor Model | 37MAHAQ09AA3 | — |
| Cooling Rated Capacity (DOE A2 - 95°F) | 9000 | Btu/h |
| SEER2 | 27.5 | Btu/h.W |
| EER2 (DOE A2 - 95°F) | 15.5 | Btu/h.W |
| Heating Rated Capacity (DOE H12 - 47°F) | 12000 | Btu/h |
| HSPF2 IV | 12.5 | Btu/h.W |
| HSPF2 V | 9.5 | Btu/h.W |
| Cooling Rated Capacity (DOE B2 - 82°F) | 10000 | Btu/h |
| EER2 (DOE B2 - 82°F) | 20.5 | Btu/h.W |
| Heating Rated Capacity (DOE H32 - 17°F) | 9800 | Btu/h |
| Heating Rated Capacity (ODE H42 - 5°F) | 11500 | Btu/h |
| Power Supply | 208/230; 1; 60 | V;Ph;Hz |
| MCA | 15 | A |
| MOP | 15 | A |
| Outdoor Sound Pressure Level | 56 | dBA |
| Net Weight | 72.75 | lbs |
| Refrigerant Type | R454B | — |
| Liquid Pipe Size | 1/4 (6.35) | in (mm) |
| Suction Pipe Size | 3/8 (9.52) | in (mm) |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with dedicated 208/230V, 1-phase, 60Hz circuits only
- Must be paired with an AHRI-certified matching Carrier Infinity indoor unit for rated 27.5 SEER2 / 12.5 HSPF2 (IV) performance
- Not compatible with 115V-only electrical circuits
- Not a confirmed match for indoor units outside the Infinity 37MAHA-compatible lineup — verify against Carrier's published AHRI directory before purchase
- Line set, wall sleeve, mounting bracket, and disconnect are NOT included — must be purchased separately
FAQ
What breaker size do I need for this system?
For the 37MAHAQ09AA3 outdoor unit, the manufacturer data lists a Minimum Circuit Ampacity (MCA) of 15A and a Maximum Overcurrent Protection (MOP) of 15A on a dedicated 208/230V, 1-phase, 60Hz circuit. A licensed electrician should size the breaker and wire gauge to local code based on these values.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. This is an outdoor condenser unit using R-454B refrigerant, requiring licensed HVAC professional installation, including proper refrigerant handling under EPA Section 608. Installation by a licensed HVAC professional is required to maintain warranty.
Is the line set included, and if not, what size do I need to buy?
The line set is sold separately. Per Carrier's specifications for this size (09K), the liquid line is 1/4 in (6.35mm) and the suction line is 3/8 in (9.52mm).
Does this system work in cold climates (low-ambient heating)?
Manufacturer data lists a Heating Rated Capacity at DOE H32 (17°F) of 9800 Btu/h and at ODE H42 (5°F) of 11500 Btu/h for the 37MAHAQ09AA3, indicating continued heating output at low outdoor temperatures. Confirm minimum operating temperature specifics with the manufacturer manual before sizing for extreme climates. [NEEDS VERIFICATION] for exact minimum operating ambient temperature.
Compliance & Warranty
This outdoor unit uses R-454B (A2L) refrigerant and requires licensed HVAC professional installation. Installation by a licensed HVAC professional is required to maintain warranty. Per Carrier's Consumer Choice Warranty, upon timely registration on eligible equipment, owners may select either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty. Terms and eligibility should be confirmed in the manufacturer documentation referenced above.
