This is the outdoor condenser (outdoor unit) for a Carrier Infinity 25 multi-zone ductless heat pump system, sized at 48,000 BTU/h. It's built for homeowners who need one outdoor unit to run multiple indoor heads across different rooms β the indoor units, line sets, 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.
This 37MGHAQ48FA3 outdoor condenser is the outdoor half of Carrier's Infinity 25 multi-zone ductless heat pump lineup, rated for use with matched indoor units in AHRI-certified combinations up to six zones. It uses a variable-speed compressor and R-454B (Puron Advance) refrigerant. Indoor unit architecture β wall mount, cassette, ducted, or a mix β depends entirely on which indoor heads you pair with it, and is not part of this listing.
- Outdoor Unit: Carrier 37MGHAQ48FA3, 48K size, family 37MGHA, variable-speed compressor, R-454B refrigerant
- Indoor Units: Not included. Supports up to 6 matched indoor heads (wall mount, cassette, ducted, or mixed) sold separately and selected per zone
- Voltage: 208/230V; 1Ph; 60Hz
- Line Set: Sold separately. Liquid pipe: 6 x 1/4in (6.35mm); Suction pipe: 3 x 3/8in + 2 x 1/2in (9.52mm/12.7mm)
- Piping Length: Minimum 10 ft per indoor unit; standard 24.6 ft per indoor unit; maximum total system piping length 328 ft
- Not Included: Indoor unit(s), line set, wall sleeve, mounting bracket, disconnect/whip, refrigerant line insulation
- Not Compatible With: 115V-only circuits; indoor units outside Carrier's AHRI-matched combinations for the 37MGHA family
- Refrigerant Note: Uses R-454B, an A2L mildly flammable refrigerant classification β professional installation required
Pro-Installer Tip: R-454B is an A2L refrigerant, and flare connections on multi-zone branch piping are a common leak point if over- or under-torqued. A loose flare bleeds refrigerant slowly, which shows up months later as reduced capacity or a communication fault between the outdoor unit and one or more indoor heads. Torque every flare connection to the fitting manufacturer's spec using a digital torque wrench, and pull the system down below the manufacturer-specified vacuum level before charging β don't rely on a visual "it held" check. This work falls under EPA Section 608 refrigerant handling requirements, and correct flare torque also protects the rated SEER2/HSPF2 efficiency numbers this system was tested to achieve.
- Variable-speed inverter compressor for steady, low-fluctuation temperature control across zones
- Outdoor sound pressure as low as 65 dBA at this size
- Rated heating output of 47,000 BTU/h at 5Β°F outdoor ambient for cold-climate performance
- Puron Advance (R-454B) refrigerant, lower global warming potential than legacy refrigerants
- Supports up to 6 indoor zones from a single outdoor condenser
- ENERGY STAR certified
| Spec | Value | Unit |
|---|---|---|
| Cooling Capacity (Rated, DOE A2 95Β°F) | 47000 | BTU/h |
| Heating Capacity (Rated, DOE H12 47Β°F) | 49000 | BTU/h |
| Heating Capacity (DOE H32, 17Β°F) | 44000 | BTU/h |
| Heating Capacity (DOE H42, 5Β°F) | 47000 | BTU/h |
| SEER2 | 23 | Btu/h.W |
| HSPF2 | 11.3 | Btu/h.W |
| EER2 (DOE A2 95Β°F) | 12 | Btu/h.W |
| Voltage | 208/230; 1Ph; 60 | V/Ph/Hz |
| Breaker Size / MCA / MOCP | [NEEDS VERIFICATION] | β |
| Outdoor Sound Pressure Level | 65 | dBA |
| Net Weight | 246.48 | lb |
| Height | 52.48 | in |
| Width | 37.25 | in |
| Depth | 17.63 | in |
| Refrigerant Type | R-454B (Puron Advance) | β |
| Zone Count | Up to 6 indoor units | β |
| Min. Piping Length per Indoor Unit | 10 | ft |
| Standard Piping Length per Indoor Unit | 24.6 | ft |
| Max. Total Piping Length per System | 328 | ft |
| Liquid Pipe Size | 6 x 1/4 (6.35mm) | in / mm |
| Suction Pipe Size | 3 x 3/8 + 2 x 1/2 (9.52/12.7mm) | in / mm |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
- Positive fit: Matched to Carrier 37MGHA family indoor units in AHRI-certified combinations, up to 6 zones total, at the 48K outdoor capacity
- Positive fit: Compatible with dedicated 208/230V, 1-phase, 60Hz circuits
- Not compatible: 115V-only circuits
- Not compatible: Indoor units outside Carrier's AHRI-matched combinations for this outdoor size/family
- Not included: Indoor unit(s), line set, wall sleeve, mounting bracket, disconnect/whip
- This listing is the outdoor condenser only β it is not a complete system and not a wall-mount, cassette, or ducted kit by itself
FAQ
What breaker size do I need for this system?
[NEEDS VERIFICATION] β the manufacturer documentation provided does not list a specific MCA/MOCP or breaker size for the 37MGHAQ48FA3 outdoor unit. Confirm this with the manufacturer's electrical data table before installation.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is a professional-install system, not a DIY kit. It uses R-454B refrigerant (an A2L mildly flammable classification), which requires licensed HVAC installation 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. For the 48K outdoor unit, the liquid pipe connections are sized 6 x 1/4in (6.35mm) and the suction pipe connections are sized 3 x 3/8in plus 2 x 1/2in (9.52mm/12.7mm), matched per indoor zone. Standard piping length is 24.6 ft per indoor unit, minimum 10 ft, with a maximum total system piping length of 328 ft.
Does this system work in cold climates (low-ambient heating)?
Yes. At 5Β°F outdoor temperature, this outdoor unit's rated heating capacity is 47,000 BTU/h, which Carrier documents as maintaining strong output in cold weather.
How many indoor units can I connect to this outdoor unit?
This 48K outdoor unit supports up to 6 indoor units total, matched to Carrier's AHRI-certified combinations for the 37MGHA family. Indoor units are sold separately from this listing.
Compliance & Warranty: This is an R-454B (A2L) refrigerant system. Installation by a licensed HVAC professional is required to maintain warranty. 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 β refer to the Resources tab for full registration terms and eligibility.
