This is the outdoor condenser (outdoor unit) only for a multi-zone ductless heat pump system — it does not include any indoor heads. It's built for homeowners or installers assembling a custom multi-zone layout (up to 5 indoor units) who already have, or are separately ordering, matched Carrier indoor units, line sets, and installation accessories.
This 37MGHAQ24DA3 outdoor unit is the condensing unit for Carrier's Infinity 25 Multi-Zone High-Heat mini split heat pump line, rated at 24K BTU/h cooling capacity and designed to pair with up to five matched indoor units (wall-mounted, cassette, or ducted) sold separately. AHRI-rated system performance depends on the specific indoor unit combination selected; consult the matched-combination rating tables in the manufacturer submittal data before final selection. 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 37MGHAQ24DA3, family 37MGHA, size 24K, variable-speed inverter compressor, R-454B (Puron Advance) refrigerant.
- Indoor Units: NOT included. This listing covers the outdoor unit only. Supports up to 5 matched indoor units (wall-mount, cassette, ducted, or mixed configurations) purchased separately.
Installation Requirements & Accessories
- Voltage: 208/230V; 1 Phase; 60Hz.
- Refrigerant: R-454B (A2L, mildly flammable classification) — requires EPA Section 608 certified handling.
- Standard piping length per indoor unit: 24.6 ft (7.5m); minimum 10 ft (3m); maximum total system piping length 262.5 ft (80m).
- Liquid line size: 4x1/4in (4x6.35mm); suction line: 3x3/8in + 1x1/2in (3x9.52mm + 1x12.7mm).
- Line Set Sold Separately — not included with this outdoor unit.
- Indoor unit(s), wall sleeve, mounting bracket, and line hide kit are NOT included.
- Not compatible with 115V-only circuits.
- Not a complete system — this SKU is the outdoor condenser only, not a wall-mounted, cassette, or ducted system.
- Professional installation required.
Pro-Installer Tip
Flare connections on R-454B systems are unforgiving of shortcuts. A slightly under-torqued or scratched flare face will leak slowly, and on an A2L refrigerant that's both a code compliance issue and a comfort complaint waiting to happen — undercharge shows up later as reduced heating capacity in cold weather or a communication/pressure fault at the indoor head. Use an eccentric flaring tool to get a clean, properly-sized flare face, and torque every connection to the value specified in the Carrier installation instructions with a calibrated digital torque wrench rather than "feel." Pull the system down below the manufacturer's specified vacuum target before charging, and confirm decay with a digital micron gauge. This work requires an EPA Section 608 certification, and doing it correctly is what lets the system deliver its rated low-ambient heating performance in the field, not just on paper.
Key Benefits
- Variable-speed inverter compressor for steady, low-fluctuation temperature control rather than on/off cycling.
- Outdoor sound pressure as low as 61 dB(A) at this 24K size, per manufacturer data.
- Rated Heating Maximum Capacity of 25,000 Btu/h at 5°F outdoor ambient — built for cold-climate heating.
- Puron Advance (R-454B) refrigerant, with a lower global warming potential than legacy refrigerants per Carrier.
- Supports up to 5 indoor units per outdoor condenser for zoned, room-by-room comfort.
- ENERGY STAR certified platform.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Component Role | Outdoor Condenser (Outdoor Unit) Only | — |
| Model | 37MGHAQ24DA3 | — |
| Family / Size Code | 37MGHA / 24K | — |
| Cooling Rated Capacity (DOE A2 - 95°F) | 24000 | Btu/h |
| Heating Rated Capacity (DOE H12 - 47°F) | 25000 | Btu/h |
| Heating Maximum Capacity (17°F) | 27000 | Btu/h |
| Heating Maximum Capacity (5°F) | 25000 | Btu/h |
| SEER2 (family, up to) | 25 | SEER2 |
| HSPF2 (family, up to) | 11.3 | HSPF2 |
| Voltage | 208/230; 1Ph; 60 | V;Ph;Hz |
| Refrigerant | R-454B (Puron Advance) | — |
| Compressor | Variable-Speed Inverter | — |
| Outdoor Sound Pressure Level | 61 | dB(A) |
| Net Weight | 168.43 | lb |
| Height | 31.89 | in |
| Width | 37.24 | in |
| Depth | 16.14 | in |
| Zone Count | Up to 5 indoor units | — |
| DIY Status | No — Professional Installation Required | — |
| Standard Piping Length per Indoor Unit | 24.6 | ft |
| Min Piping Length per Indoor Unit | 10 | ft |
| Max Piping Length (no additional refrigerant) | 98.4 | ft |
| Total Maximum Piping Length per System | 262.5 | ft |
| Breaker Size / MCA / MOCP | [NEEDS VERIFICATION] | — |
| Operating Temperature Range (Heating/Cooling) | [NEEDS VERIFICATION] | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with dedicated 208/230V single-phase, 60Hz circuits only.
- Designed to pair with Carrier-matched indoor units in the 37MGHA multi-zone family, up to 5 zones total, using AHRI-certified indoor/outdoor combinations.
- Not compatible with 115V-only circuits.
- Not a listed match for indoor units outside Carrier's approved 37MGHA multi-zone combination charts — confirm the exact indoor model pairing in the manufacturer submittal data before ordering.
- Line set is NOT included with this outdoor unit; it must be purchased separately and sized per the piping table above.
- Wall sleeve, mounting bracket, and indoor unit(s) are NOT included.
- This listing is the outdoor condenser only — it is not a complete system and is not a wall-mounted, cassette, or ducted indoor unit.
FAQ
What breaker size do I need for this system?
[NEEDS VERIFICATION] — the provided manufacturer data does not list a specific MCA/MOCP or breaker size for the 37MGHAQ24DA3 outdoor unit. Confirm exact breaker sizing against the installation instructions before wiring.
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 refrigerant) and requires flare connections, vacuum evacuation, and EPA Section 608 certified handling. Professional installation by a licensed HVAC contractor is required.
Is the line set included, and if not, what size do I need to buy?
No line set is included with this outdoor unit. Line sets are sold separately. Per indoor unit, the liquid line is sized 1/4in (6.35mm) and the suction line runs 3/8in or 1/2in depending on the connection port used, with a standard run of 24.6 ft (7.5m) per indoor unit and a minimum of 10 ft (3m).
Will the ceiling cassette fit between standard 16-inch on-center joists?
This listing is for the outdoor condenser only — no indoor cassette is included. Ceiling joist fitment depends on which indoor unit model you pair with this outdoor unit, and is [NEEDS VERIFICATION] since indoor unit specifications are not part of this listing.
Does this system work in cold climates (low-ambient heating)?
Yes. Carrier's manufacturer data lists a Heating Maximum Capacity of 25,000 Btu/h at 5°F outdoor temperature for the 24K size, along with 27,000 Btu/h at 17°F, indicating continued heating output in cold outdoor conditions.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L classification) refrigerant and must be installed and serviced by technicians holding current EPA Section 608 certification. Per manufacturer data, Carrier's Consumer Choice Warranty offers, upon timely registration on eligible equipment, either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty. Exact terms depend on registration and installer licensing status — refer to the manufacturer warranty documentation in the Resources tab for full conditions.
