This is the outdoor condenser (outdoor unit) only for a Carrier Infinity 21 single-zone mini split heat pump system ā model 37MBHAQ36AA3, 36,000 BTU/h. It's built for installers and homeowners matching it to a compatible indoor head for a single room, addition, or light commercial space; the indoor unit, line set, and mounting accessories are sold separately.
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 Carrier 37MBHAQ36AA3 is the outdoor condenser for the Infinity 21 Light Commercial Mini Split Heat Pump line, rated at 36,600 Btu/h cooling (DOE A2, 95Ā°F) and 37,000 Btu/h heating (DOE H12, 47Ā°F) when matched to an AHRI-certified indoor unit. Rated efficiencies shown here (21.3 SEER2, 10.6/8.8 HSPF2) are AHRI system ratings that depend on the specific matched indoor unit named in Carrier's certified directory ā confirm your indoor pairing before ordering. This is a single-zone, professional-install system using R-454B (A2L) refrigerant.
System Components
- Outdoor Condenser: Carrier 37MBHAQ36AA3, 36K, variable-speed (inverter-driven) compressor, 208/230V;1Ph;60Hz.
- Indoor Unit: NOT included in this listing. A matched, AHRI-certified indoor head is required and must be purchased separately.
Installation Requirements & Accessories
- Voltage: 208/230V;1Ph;60Hz. Not compatible with 115V-only circuits.
- Refrigerant: R-454B (A2L), factory charge 7.94 lb (3.6 kg). Requires EPA Section 608 certification for handling.
- Liquid line: 3/8 in. Suction line: 3/4 in. Standard piping length 24.6 ft; maximum total piping length 246 ft (per manufacturer data).
- Line Set Sold Separately ā not included with this outdoor condenser.
- Indoor unit, wall sleeve, and mounting bracket are NOT included and must be selected separately based on your matched indoor model.
- Professional installation required. This is not a DIY / pre-charged quick-connect system.
- Breaker sizing (MCA/MOCP): [NEEDS VERIFICATION] ā not confirmed for this exact model in the provided data. Refer to the unit's installation instructions and nameplate.
Pro-Installer Tip
R-454B is a mildly flammable (A2L) refrigerant, and flare connections on the liquid and suction lines (3/8 in and 3/4 in on this model) are the most common source of slow leaks that show up months later as lost capacity or nuisance fault codes. Torque flare nuts to the fitting manufacturer's spec with a calibrated torque wrench rather than "snugging by feel" ā an under-torqued flare loses refrigerant charge over time, and an over-torqued flare can crack the flare face outright. Because total piping runs on this model can reach up to 246 ft, verify the system is evacuated properly before charging so trapped moisture and air don't compromise the A2L refrigerant circuit. EPA Section 608 certification is required to handle and recover R-454B refrigerant on this job.
Key Benefits
- Variable-speed (inverter-driven) compressor for steadier temperature control versus single-speed compressors.
- Outdoor sound pressure level as low as 64.5 dB(A) at this size.
- Heating operation rated down to -22Ā°F outdoor ambient; cooling rated up to 122Ā°F outdoor ambient.
- Puron Advanceā¢ (R-454B) refrigerant, rated by the manufacturer to reduce global warming potential by 75% compared to traditional refrigerants.
- Long line-set flexibility: standard piping length 24.6 ft, up to 246 ft total.
- Standard crankcase heater and base pan heater on this unit size.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Model | 37MBHAQ36AA3 | ā |
| Cooling Rated Capacity (DOE A2, 95Ā°F) | 36600 | Btu/h |
| Cooling Rated Capacity (DOE B2, 82Ā°F) | 37800 | Btu/h |
| Heating Rated Capacity (DOE H12, 47Ā°F) | 37000 | Btu/h |
| Heating Rated Capacity (DOE H32, 17Ā°F) | 30600 | Btu/h |
| Heating Rated Capacity (ODE H42, 5Ā°F) | 37000 | Btu/h |
| SEER2 | 21.3 | Btu/h.W |
| EER2 (DOE A2, 95Ā°F) | 12 | Btu/h.W |
| HSPF2 IV | 10.6 | Btu/h.W |
| HSPF2 V | 8.8 | Btu/h.W |
| Voltage | 208/230;1;60 | V;Ph;Hz |
| Breaker Size (MCA/MOCP) | [NEEDS VERIFICATION] | ā |
| Refrigerant Type | R-454B | ā |
| Refrigerant Oil | Ester Oil | ā |
| Refrigerant Charge | 7.94 | lb |
| Liquid Pipe Size | 3/8 | in |
| Suction Pipe Size | 3/4 | in |
| Standard Piping Length | 24.6 | ft |
| Maximum Total Piping Length | 246 | ft |
| Outdoor Sound Pressure Level | 64.5 | dB(A) |
| Operating Weight | 206.57 | lbs |
| Height | 38.39 | in |
| Width | 38.58 | in |
| Depth | 16.34 | in |
| Cooling Operating Range (max ambient) | 122 | Ā°F |
| Heating Operating Range (min ambient) | -22 | Ā°F |
| Zone Count | 1 | ā |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with 208/230V;1Ph;60Hz dedicated circuits only.
- Must be matched to an AHRI-certified compatible indoor unit; check Carrier's certified directory for the exact model pairing before ordering.
- Not compatible with 115V-only circuits.
- Indoor unit is NOT included ā this listing is the outdoor condenser only.
- Line set is NOT included ā size per this unit's requirements (3/8 in liquid, 3/4 in suction).
- Wall sleeve, mounting bracket, and other indoor-side accessories are NOT included.
FAQ
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is a professional-install system using R-454B refrigerant (A2L classification). It is not a DIY pre-charged kit. Installation by a licensed HVAC professional is required to maintain the warranty.
Is the line set included, and if not, what size do I need to buy?
The line set is not included with this outdoor condenser. This model uses a 3/8 in liquid line and 3/4 in suction line. Standard piping length is 24.6 ft, with a maximum total piping length of 246 ft per the manufacturer data.
What breaker size do I need for this system?
[NEEDS VERIFICATION] ā MCA and MOCP for the 37MBHAQ36AA3 outdoor unit are not confirmed in the source data. Confirm minimum circuit amps and maximum overcurrent protection from the unit's installation instructions or nameplate before sizing the breaker.
Does this system work in cold climates (low-ambient heating)?
The manufacturer rates this system for heating operation down to -22Ā°F outdoor ambient temperature, and cooling operation up to 122Ā°F, per Carrier's published overview for the 37MBHA family.
Does this listing include the indoor unit?
No. This listing is the outdoor condenser only (37MBHAQ36AA3). A matched indoor unit, sold separately, is required to complete the system.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This system uses R-454B (A2L) refrigerant and requires EPA Section 608 certification to install or service. Per Carrier's Consumer Choice Warranty, upon timely registration on eligible equipment you may select 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 full terms and registration requirements.
