This is the outdoor condenser (outdoor unit) only for a single-zone ductless heat pump system. It is built for homeowners or installers who already have — or are separately sourcing — a matched Carrier indoor head, line set, and mounting accessories; this listing does not include an indoor unit, line set, or installation kit.
The 37MPRAQ09AA3 is the outdoor condenser half of Carrier's Infinity 35 single-zone ductless heat pump lineup, rated at 9,000 Btu/h cooling and paired in AHRI-certified combination with a matching indoor head (indoor unit sold separately — not included with this listing). This size uses a variable-speed rotary 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 35, model 37MPRAQ09AA3, 9,000 Btu/h nominal cooling size, single-zone, variable-speed compressor
- Indoor Head: NOT included with this listing — matched Carrier indoor unit sold separately
Installation Requirements & Accessories
- Voltage: 208/230V, 1-Phase, 60Hz — dedicated circuit required
- Minimum Circuit Ampacity (MCA): 16A; Maximum Overcurrent Protection (MOP): 20A
- Line set required: 1/4-in liquid, 3/8-in suction; standard length 24.6 ft, minimum 9.8 ft, maximum total 82.02 ft — Line Set Sold Separately
- Refrigerant: R-454B (A2L mildly flammable classification) — professional installation required
- Not Included: indoor unit, line set, wall sleeve, mounting bracket, or wiring
- Not Compatible With: 115V-only circuits
- Not a listed match for indoor unit families outside AHRI-certified 37MPRA combinations
Pro-Installer Tip
Because this outdoor unit runs R-454B (an A2L mildly flammable refrigerant), flare connections at both the liquid and suction ports need to be free of oil residue and torqued to the connection's rated spec before the system is energized — a loose or over-torqued flare is one of the most common causes of slow refrigerant loss and nuisance low-charge faults down the line. Use a digital torque wrench rather than a "feel" method, and pull the line set down to vacuum before opening the service valves; skipping this step traps moisture in the circuit and shortens compressor life. This work falls under EPA Section 608 refrigerant handling requirements — installation and any refrigerant work on this A2L system must be performed by an EPA 608-certified technician.
Key Benefits
- Variable-speed inverter-driven compressor for steadier temperature control than fixed-speed systems
- Outdoor sound level as low as 57 dBA
- Rated heating output down to 5°F (13,500 Btu/h) and 17°F (11,000 Btu/h) for cold-climate performance
- Puron Advance (R-454B) refrigerant, lower global warming potential than legacy refrigerants
- ENERGY STAR certified at the system level when paired with a matched indoor unit
| Spec | Value | Unit |
|---|---|---|
| Cooling Rated Capacity (DOE A2, 95°F) | 9000 | Btu/h |
| Heating Rated Capacity (DOE H12, 47°F) | 12000 | Btu/h |
| SEER2 | 33.5 | Btu/h.W |
| EER2 (DOE A2, 95°F) | 17 | Btu/h.W |
| Heating Rated Capacity (17°F) | 11000 | Btu/h |
| Heating Rated Capacity (5°F) | 13500 | Btu/h |
| Voltage | 208/230, 1-Phase, 60 | V-Ph-Hz |
| Minimum Circuit Ampacity (MCA) | 16 | A |
| Maximum Overcurrent Protection (MOP) | 20 | A |
| Outdoor Sound Level | 57 | dBA |
| Refrigerant | R-454B | — |
| Liquid Pipe Size | 1/4 | in |
| Suction Pipe Size | 3/8 | in |
| Standard Piping Length | 24.6 | ft |
| Net Weight | 99.65 | lb |
| HSPF2 | [NEEDS VERIFICATION] | Btu/h.W |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with matched, AHRI-certified Carrier 615PHAQ-series indoor heads sized for the 9K family (indoor unit sold separately)
- Requires a dedicated 208/230V, 1-phase circuit
- Not compatible with 115V-only circuits
- Not a listed match for indoor/outdoor combinations outside the AHRI-certified 37MPRA family pairing
- Line set, wall sleeve, and mounting bracket are NOT included — must be purchased separately
FAQ
What breaker size do I need for this system?
The 37MPRAQ09AA3 outdoor unit has a Minimum Circuit Ampacity (MCA) of 16A and a Maximum Overcurrent Protection (MOP) rating of 20A on a dedicated 208/230V, 1-phase circuit. Breaker sizing should follow NEC and local code requirements.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. This unit uses R-454B refrigerant (an A2L mildly flammable classification) and requires professional installation by a licensed HVAC technician.
Is the line set included, and if not, what size do I need to buy?
No line set is included with this outdoor unit. This model requires a 1/4-inch liquid line and 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.
Does this system work in cold climates (low-ambient heating)?
Manufacturer data shows rated heating capacity of 11,000 Btu/h at 17°F and 13,500 Btu/h at 5°F for this outdoor unit. [NEEDS VERIFICATION] for any minimum operating temperature limit below 5°F, as this was not stated in the provided specification data.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L) refrigerant; installation and servicing require EPA Section 608 certification. Upon timely registration on eligible equipment, Carrier's Consumer Choice Warranty offers either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty — refer to the manufacturer warranty documentation in the Resources tab for eligibility terms.
