This is the outdoor condenser (outdoor unit) only for a Carrier Performance 25 multi-zone ductless heat pump system — model 37MGRAQ24DA3, a 24,000 BTU/h capacity unit that pairs with up to four indoor heads. It's built for homeowners planning a multi-room ductless install who need the outdoor half of the system; indoor heads, line sets, and mounting accessories are sold separately.
This listing covers the outdoor condenser only — Carrier model 37MGRAQ24DA3, part of the 37MGRA Performance 25 multi-zone family, rated at 24,000 BTU/h. It is engineered to pair with up to four Carrier-matched indoor heads (wall-mounted, cassette, ducted, or floor/ceiling styles sold separately) to build a custom multi-zone ductless system. Rated efficiencies shown below are AHRI system ratings recorded with a matched indoor unit; actual efficiency depends on the indoor head paired with this condenser. 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 37MGRAQ24DA3, 24,000 BTU/h nominal cooling capacity, variable-speed (inverter) compressor, R-454B (Puron Advance) refrigerant.
- Indoor heads: NOT included. This condenser supports up to four Carrier-matched indoor units (wall-mount, 4-way cassette, 1-way cassette, ducted, or floor/ceiling), sold separately.
Installation Requirements & Accessories
- Voltage: 208/230V, single-phase (208/230-1-60).
- Minimum Circuit Ampacity (MCA): 23A. Maximum Overcurrent Protection (MOCP): 25A.
- Liquid pipe size: 4x1/4in. Suction pipe size: 3x3/8in+1x1/2in.
- Standard piping length: 24.6 ft. Total maximum system piping length: 262.5 ft.
- Line set is sold separately — not included with this outdoor condenser.
- Professional installation is required. This system uses A2L-classified R-454B refrigerant, which requires EPA Section 608-certified handling.
- Not included: indoor unit(s), wall sleeve, mounting bracket, and line set.
- Not compatible with 115V-only circuits; this unit is rated for 208/230V only.
- Not a complete system as sold — this is the outdoor unit only. Indoor units must be selected from the AHRI-matched 37MGRA compatible lineup.
Pro-Installer Tip
Flare connections on multi-zone branch piping are a common source of slow refrigerant leaks, especially with A2L refrigerants like R-454B where even small leaks matter for both performance and code compliance. Use a digital torque wrench to tighten each flare nut to the manufacturer's specified torque — under-torquing invites leaks and callback "low charge" complaints, while over-torquing can crack the flare face. Because this outdoor unit supports up to four indoor branches, verify each flare joint individually before charging the system. Work performed on this R-454B system must be completed by an EPA Section 608-certified technician.
Key Benefits
- Variable-speed inverter compressor for steady temperature control across all connected zones.
- Outdoor sound pressure level as low as 61 dBA for this size.
- Low-ambient heating capability rated to -13°F.
- Supports up to four indoor zones from a single outdoor unit for tailored room-by-room comfort.
- Puron Advance (R-454B) refrigerant, rated to reduce global warming potential by 75% versus older refrigerants.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Component Role | Outdoor Condenser Only | — |
| Cooling Capacity (Rated) | 24000 | BTU/h |
| SEER2 | 25 | SEER2 |
| EER2 | 13.5 | EER2 |
| HSPF2 (Region IV) | 9.5 | HSPF2 |
| HSPF2 (Region V) | 7.5 | HSPF2 |
| Voltage | 208/230 | V |
| Minimum Circuit Ampacity (MCA) | 23 | A |
| Maximum Overcurrent Protection (MOCP) | 25 | A |
| Outdoor Sound Pressure Level | 61 | dBA |
| Operating Range | -13 to 75 | °F |
| Refrigerant Type | R-454B | — |
| Liquid Pipe Size | 4x1/4 | in |
| Suction Pipe Size | 3x3/8+1x1/2 | in |
| Net Weight | 138.89 | lbs |
| Standard Piping Length | 24.6 | ft |
| Total Maximum Piping Length | 262.5 | ft |
| Zone Count | Up to 4 indoor units | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with Carrier 37MGRA-family indoor units in AHRI-matched combinations, up to four indoor zones total.
- Requires a dedicated 208/230V single-phase circuit; not compatible with 115V-only circuits.
- Line set is NOT included — must be sized and purchased separately to match liquid pipe (4x1/4in) and suction pipe (3x3/8in+1x1/2in) requirements.
- Wall sleeve and mounting bracket are NOT included where applicable to the indoor unit selected.
- Not a listed match for indoor unit families outside the Carrier 37MGRA AHRI-certified combinations.
FAQ
What breaker size do I need for this system?
The 37MGRAQ24DA3 outdoor unit has a Minimum Circuit Ampacity (MCA) of 23A and a Maximum Overcurrent Protection (MOCP) rating of 25A on a 208/230V circuit. A licensed electrician should confirm final breaker sizing 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 classified) 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?
No, the line set is not included. This outdoor unit requires a liquid pipe size of 4x1/4in and a suction pipe size of 3x3/8in+1x1/2in, matched to the indoor unit(s) you select. Standard piping length is 24.6 ft, with a total maximum system piping length of 262.5 ft.
Does this system work in cold climates (low-ambient heating)?
Yes. The published operating range for this unit is -13°F to 75°F, and heating capacity data is provided down to 5°F ambient in the manufacturer specifications.
How many indoor units can this outdoor condenser support?
The 37MGRAQ24DA3 is part of the 37MGRA multi-zone family and can pair with up to four indoor units, depending on indoor unit capacities and AHRI-matched combinations.
Compliance & Warranty
This outdoor condenser uses R-454B (A2L classified) refrigerant. Installation by a licensed HVAC professional is required to maintain warranty. Work must comply with EPA Section 608 refrigerant handling requirements. Carrier's Consumer Choice Warranty applies upon timely registration: on eligible equipment, choose 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 (System Manuals and Warranty)" Tab above for full terms.
