This is the outdoor condenser (outdoor unit) only for a Carrier Infinity 21 light commercial mini split heat pump system, size 48K. It's built for installers and property owners matching a new condenser to a compatible single-zone indoor unit β the indoor head, line set, and mounting accessories are sold separately.
This 48K outdoor condenser is part of Carrier's Infinity 21 light commercial mini split lineup, engineered for single-zone applications and rated by AHRI in matched-system testing with a compatible indoor unit. 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 Unit: Carrier 37MBHAQ48AA3, family 37MBHA, size 48K, variable-speed inverter-driven compressor
- Indoor Unit: NOT included β sold separately; must be a matched, AHRI-certified indoor head from the compatible 37MBHA family lineup
Installation Requirements & Accessories
- Voltage: 208/230V; 1-Phase; 60Hz β this is a 208/230V circuit; not compatible with 115V-only circuits
- Line Set: 3/8" liquid line, 3/4" suction line β Line Set Sold Separately
- Standard piping length is 24.6 ft (7.5 m); total system piping length can extend up to 246 ft (75 m) per manufacturer data
- Professional installation required β this unit uses R-454B (A2L mildly flammable) refrigerant and is factory-charged at 7.94 lb (3.6 kg)
- Not compatible with 115V-only circuits
- Indoor unit NOT included with this listing
- Wall sleeve, mounting bracket, and grille (if applicable to the matched indoor unit) NOT included
- MCA / MOCP breaker sizing: [NEEDS VERIFICATION] for this specific model β confirm via installation instructions before rough-in
Pro-Installer Tip
Flare connections on R-454B systems are unforgiving of shortcuts. A slightly under-torqued flare nut on the 3/8" liquid line or 3/4" suction line connection at this unit's service valves will seep refrigerant slowly enough to pass an initial leak check but still starve the system over the first cooling season, showing up as reduced capacity or a communication fault at the indoor head. Torque every flare joint to the fitting manufacturer's spec with a calibrated digital torque wrench, not by feel, and pull the system down with a proper micro-deep vacuum pump before opening the service valves β this protects the factory-charged 7.94 lb (3.6 kg) of R-454B and keeps the system's rated SEER2/HSPF2 performance intact. Refrigerant handling on this A2L system requires EPA Section 608 certification.
Key Benefits
- Variable-speed inverter compressor for steady temperature control rather than on/off cycling
- Outdoor sound pressure rated as low as 62.5 dB(A) at this size
- Rated heating operation down to -22Β°F ambient and cooling operation up to 122Β°F ambient
- Puron Advance (R-454B) refrigerant, rated by the manufacturer at 75% lower global warming potential than legacy refrigerants
- Long line-set flexibility, up to 246 ft total piping length, for flexible outdoor unit placement
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Model | 37MBHAQ48AA3 | β |
| Cooling Rated Capacity (DOE A2 - 95Β°F) | 48000 | Btu/h |
| Cooling Rated Capacity (DOE B2 - 82Β°F) | 51000 | Btu/h |
| SEER2 | 18.2 | Btu/h.W |
| EER2 (DOE A2 - 95Β°F) | 10 | Btu/h.W |
| Heating Rated Capacity (DOE H12 - 47Β°F) | 53000 | Btu/h |
| Heating Rated Capacity (DOE H32 - 17Β°F) | 44000 | Btu/h |
| Heating Rated Capacity (ODE H42 - 5Β°F) | 47500 | Btu/h |
| HSPF2 IV | 11 | Btu/h.W |
| HSPF2 V | 8.8 | Btu/h.W |
| Power Supply | 208/230;1;60 | V;Ph;Hz |
| Refrigerant Type | R-454B | β |
| Refrigerant Charge Amount | 7.94 (3.6) | lb (kg) |
| Liquid Pipe Size | 3/8 | in |
| Suction Pipe Size | 3/4 | in |
| Outdoor Sound Pressure Level | 62.5 | dB(A) |
| Operating Weight | 208.78 (94.7) | lb (kg) |
| Standard Piping Length | 24.6 (7.5) | ft (m) |
| Maximum Total Piping Length | 246 (75) | ft (m) |
| Cooling Operating Range (max ambient) | 122 | Β°F |
| Heating Operating Range (min ambient) | -22 | Β°F |
| MCA / MOCP (breaker sizing) | [NEEDS VERIFICATION] | β |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- This listing is the outdoor condenser unit only (37MBHAQ48AA3). It does not include an indoor unit, line set, wall sleeve, or mounting bracket.
- Compatible with a matched, AHRI-certified single-zone indoor unit from the 37MBHA family β confirm exact matched indoor model number before ordering.
- Requires a dedicated 208/230V, single-phase, 60Hz circuit.
- Not compatible with 115V-only circuits.
- Line set required: 3/8" liquid / 3/4" suction, standard length 24.6 ft, maximum total system length 246 ft. Line set is NOT included.
- Not a listed match for indoor units outside the AHRI-certified 37MBHA matched combinations β confirm compatibility before purchase.
FAQ
What breaker size do I need for this system?
[NEEDS VERIFICATION] β the manufacturer data provided does not list an MCA or MOCP value specific to the 37MBHAQ48AA3. Refer to the unit's installation instructions and the manufacturer resources tab for the correct MCA/MOCP figures before sizing a breaker.
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 (an A2L mildly flammable classification) and requires professional installation by a licensed HVAC contractor to maintain the manufacturer warranty.
Is the line set included, and if not, what size do I need to buy?
The line set is sold separately. This outdoor unit uses a 3/8-inch liquid line and a 3/4-inch suction line. Standard piping length is 24.6 ft, with a maximum total piping length of 246 ft β confirm minimum run length with your installer.
Does this system work in cold climates (low-ambient heating)?
Yes. The manufacturer rates heating capability down to -22Β°F ambient temperature and cooling capability up to 122Β°F, based on published overview data for the Infinity 21 Light Commercial line.
What refrigerant does this outdoor unit use, and how much is charged at the factory?
This unit ships with a full factory charge of 7.94 lb (3.6 kg) of R-454B (Puron Advance) refrigerant with ester oil.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L classification) refrigerant, which requires EPA Section 608 certified handling. Per manufacturer data, upon timely registration on eligible equipment, buyers may 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 requirements in the manufacturer documentation available in the "Resources (System Manuals and Warranty)" Tab above.
