Carrier | 12,000 BTU | 29.5 SEER2 | Outdoor Condenser (Outdoor Unit Only) | Single-Zone Mini Split System | 208/230V | 37MPRAQ12AA3

This is the outdoor condenser only for a Carrier Infinity 35 ductless heat pump system — model 37MPRAQ12AA3, a 12,000 BTU/h, 1-ton unit. It's built for homeowners or installers who already have (or are separately sourcing) a matched Carrier 615PHAQ12XA3 indoor head, line set, and accessories, and need the outdoor half of that pairing.

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.

The 37MPRAQ12AA3 is the outdoor half of a Carrier Infinity 35 single-zone ductless heat pump pairing, AHRI-rated together with the Carrier 615PHAQ12XA3 indoor head. It runs a variable-speed (inverter-driven) compressor and uses R-454B (Puron Advance) refrigerant. This listing is the outdoor condenser only — no indoor head, line set, or mounting accessories are included.

System Components

• Outdoor Condenser (included): Carrier 37MPRAQ12AA3 — 12,000 BTU/h, 208/230V, 1-Phase, variable-speed compressor, R-454B refrigerant.
• Indoor Head (NOT included): AHRI-matched pairing is the Carrier 615PHAQ12XA3. Must be purchased separately.

Installation Requirements & Accessories

• Voltage: 208/230V, 1-Phase, 60Hz. Min-Max voltage range 187-253V. Not compatible with 115V-only circuits.
• Minimum Circuit Ampacity (MCA): 16A. Maximum Overcurrent Protection (MOP): 20A.
• Line set required: 1/4-inch liquid line, 3/8-inch suction line. Standard length 24.6 ft, minimum 9.8 ft, maximum total run 82.02 ft.
• Line Set Sold Separately — not included with this outdoor unit.
• Indoor head, wall sleeve, mounting bracket, and disconnect box are NOT included and must be purchased separately.
• Professional installation required — this outdoor condenser is a Non-DIY, flare-connection system using R-454B (A2L) refrigerant.
• Not a listed AHRI match for indoor units outside the 615PHAQ12XA3 family for this size.

Pro-Installer Tip

Flare connections on R-454B systems are unforgiving of shortcuts — an under-torqued or scored flare face is the leading cause of slow leaks that show up months later as reduced capacity or an E1-style communication fault as the system struggles to maintain charge. Torque every flare joint to the connection size using a digital torque wrench rather than "feel," and inspect the flare face with an eccentric flaring tool before final connection to avoid re-flaring in the field. This is standard practice for maintaining rated SEER2/HSPF2 performance and is required under EPA Section 608 refrigerant handling rules for any technician working with R-454B.

Key Benefits

• Variable-speed (inverter-driven) compressor for smoother, more precise temperature control than single-speed systems.
• Outdoor sound level as low as 57 dBA at this size.
• Rated for heating performance down to -22°F ambient per manufacturer overview, with published capacity data through DOE H42 (5°F) testing.
• Puron Advance (R-454B) refrigerant, with lower global warming potential than legacy refrigerants.
• ENERGY STAR certified, with system-level SEER2 of 29.5 and HSPF2 of 14.5 at this size when matched with the 615PHAQ12XA3 indoor head.
• Basepan heater included for reliable cold-climate startup.

Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.

Compatibility & Fitment

• Positive fitment: AHRI-rated match with Carrier indoor model 615PHAQ12XA3.
• Positive fitment: Runs on a dedicated 208/230V, 1-Phase, 60Hz circuit with MCA 16A / MOP 20A.
• Negative fitment: Not compatible with 115V-only circuits.
• Negative fitment: Not a listed AHRI match for indoor units outside the 615PHAQ12XA3 pairing for this size.
• Negative fitment: Line set is NOT included — this is not a pre-charged DIY kit.
• Negative fitment: Wall sleeve, mounting bracket, and disconnect box are NOT included.

FAQ

What breaker size do I need for this system?

The 37MPRAQ12AA3 has a Minimum Circuit Ampacity (MCA) of 16A and a Maximum Overcurrent Protection (MOP) rating of 20A, on a dedicated 208/230V, 1-Phase, 60Hz circuit. Confirm final breaker sizing with a licensed electrician per NEC and local code.

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 and requires flare connections, EPA Section 608 refrigerant handling, and evacuation by a licensed HVAC professional. Professional installation is required.

Is the line set included, and if not, what size do I need to buy?

No line set is included. This model requires a 1/4-inch liquid line and a 3/8-inch suction line. Standard piping length is 24.6 ft, with a minimum of 9.8 ft and a maximum total run of 82.02 ft; buy line set separately sized to your installation distance.

Does this system work in cold climates (low-ambient heating)?

Carrier's overview states this system delivers reliable heating down to -22°F. At the DOE H32 (17°F) test point this model is rated at 11000 Btu/h, and at DOE H42 (5°F) it is rated at 13500 Btu/h.

Which indoor unit does this outdoor condenser match?

The 37MPRAQ12AA3 outdoor condenser is AHRI-rated in a matched pair with the Carrier 615PHAQ12XA3 indoor head. It is not rated or listed with other indoor model families.

Compliance & Warranty

This unit uses R-454B (A2L) refrigerant and requires EPA Section 608 certification to install or service. Installation by a licensed HVAC professional is required to maintain warranty. Per 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; see manufacturer documentation for full terms and registration requirements.