This is the outdoor condenser (outdoor unit) for a Carrier Performance 25 multi-zone mini split heat pump system. It is built for homeowners or installers assembling a custom multi-zone ductless system serving up to six indoor zones; it does not include any indoor head, line set, or mounting accessories.
The 37MGRAQ48FA3 is the 48K BTU outdoor condenser in Carrier's Performance 25 (37MGRA) multi-zone lineup, rated for use with AHRI-certified matched indoor units in configurations up to six zones. Rated efficiencies shown below (SEER2 24, EER2 12.5, HSPF2 10.4) are AHRI system ratings tied to a matched indoor unit combination named in Carrier's published documentation, not a standalone figure for this outdoor unit alone. 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 37MGRAQ48FA3, 48K BTU class, variable-speed (inverter-driven) compressor, R-454B refrigerant
- Indoor unit(s): NOT included β select up to 6 compatible indoor heads (wall mount, cassette, ducted, or floor/ceiling) separately based on your zone plan
Installation Requirements & Accessories
- Voltage: 208/230V, single-phase, 60Hz
- Minimum Circuit Ampacity (MCA): 40A; Maximum Overcurrent Protection (MOCP): 45A
- Line set sold separately β outdoor connections are 6x1/4in liquid and 4x3/8in+2x1/2in suction; standard piping length 24.6 ft, max 147.6 ft per system without added charge, total max 262.5 ft
- Professional installation required β this unit uses R-454B (A2L classified) refrigerant, which requires EPA Section 608 and A2L-specific handling certification
- Not included: indoor unit(s), line set, wall sleeve, mounting bracket, disconnect box, or low-voltage communication wire
- Not compatible with 115V-only circuits
- Not a complete system on its own β must be paired with an AHRI-certified matched indoor unit combination to achieve the rated SEER2/HSPF2 figures published for this model
Pro-Installer Tip
Flare connections on multi-zone branch piping are a common source of slow refrigerant leaks, especially on the smaller 1/4in liquid lines feeding each zone. A loose or over-torqued flare on R-454B systems will eventually show up as reduced capacity or a communication fault between indoor and outdoor boards. Torque every flare joint to the connection size specification using a calibrated digital torque wrench, and pull the system down below the manufacturer's required vacuum level before charging β do not rely on time-based evacuation alone. Because R-454B is A2L-classified (mildly flammable), this work must be performed by a technician holding current EPA Section 608 certification with A2L-specific training.
Key Benefits
- Variable-speed inverter-driven compressor for steady, minimal-fluctuation comfort across multiple zones
- Supports up to 6 independent indoor zones from a single outdoor unit
- Outdoor sound pressure as low as 63 dBA at this size
- Rated heating operation down to -13 F for cold-climate performance
- Puron Advance (R-454B) refrigerant, reducing global warming potential versus older refrigerants
- ENERGY STAR-eligible efficiency levels at select sizes
| Spec | Value | Unit |
|---|---|---|
| Model | 37MGRAQ48FA3 | β |
| Cooling Capacity (Rated) | 45000 | BTU/h |
| Cooling Capacity (Range) | 12000-55000 | BTU/h |
| SEER2 | 24 | Btu/h per W |
| EER2 | 12.5 | Btu/h per W |
| HSPF2 (Region IV) | 10.4 | Btu/h per W |
| HSPF2 (Region V) | 8 | Btu/h per W |
| Voltage | 208/230 | V, 1-phase, 60Hz |
| MCA | 40 | A |
| MOCP | 45 | A |
| Outdoor Sound Pressure Level | 63 | dBA |
| Operating Range (Heating) | -13 to 75 | Β°F |
| Zone Count (Max) | 6 | zones |
| Refrigerant | R-454B | β |
| Liquid Line (Outdoor Side) | 6x1/4 | in |
| Suction Line (Outdoor Side) | 4x3/8+2x1/2 | in |
| Standard Piping Length | 24.6 | ft |
| Max Piping (No Added Charge) | 147.6 | ft |
| Total Max Piping Length | 262.5 | ft |
| Net Weight | 222 | lbs |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with dedicated 208/230V single-phase circuits only β not compatible with 115V-only circuits
- Supports up to 6 AHRI-certified matched indoor units for multi-zone configurations; refer to Carrier's matched combination documentation for approved indoor pairings
- Line set NOT included β outdoor connection sizes are 6x1/4in liquid and 4x3/8in+2x1/2in suction; buy piping sized to your specific run length and zone count
- Wall sleeve, mounting bracket, disconnect box, and communication wire are NOT included
- Indoor unit(s) are NOT included with this listing β this SKU is the outdoor condenser only
- Not a listed match for indoor units outside Carrier's published 37MGRA-compatible family; confirm model-specific AHRI combination before ordering
FAQ
What breaker size do I need for this system?
The 37MGRAQ48FA3 has a Minimum Circuit Ampacity (MCA) of 40A and a Maximum Overcurrent Protection (MOCP) rating of 45A on a 208/230V, single-phase circuit. A licensed electrician should size the breaker and wire per 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 (A2L) refrigerant and requires professional installation by a licensed HVAC technician 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's connections are 6x1/4in liquid and 4x3/8in+2x1/2in suction. Standard piping length is 24.6 ft, with a maximum of 147.6 ft per system before additional refrigerant charge is required, and a total maximum piping length of 262.5 ft across all zones.
Does this system work in cold climates (low-ambient heating)?
Yes. The manufacturer-published heating operating range extends down to -13 F.
How many indoor zones can this outdoor unit support?
This outdoor unit supports up to six compatible indoor units (zones), depending on the matched indoor unit combination and total piping length.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L classified) refrigerant, and installation must comply with EPA Section 608 handling requirements. 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. Warranty terms require professional installation; self-installation is not covered under this program. Refer to the manufacturer warranty documentation in the Resources tab for full terms.
