This is the outdoor condenser (outdoor unit) only for a Carrier Performance 25 multi-zone ductless heat pump system. It's built for homeowners who need one outdoor unit capable of running up to six indoor zones — matching indoor heads, line sets, and mounting accessories are sold separately.
The Carrier Performance 25 (37MGRA family) outdoor unit is a variable-speed, inverter-driven heat pump condenser designed to pair with matched Carrier indoor heads in a multi-zone ductless configuration — wall-mounted, cassette, ducted, or floor/ceiling heads can be mixed depending on the AHRI-certified combination selected at time of design. AHRI-rated performance figures shown below are system ratings tied to a specific matched indoor unit combination named in Carrier's published performance tables; this listing covers the outdoor condenser only. 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 (included in this listing): Carrier 37MGRAQ55FA3 — 55K BTU nominal, multi-zone, variable-speed compressor, R-454B (Puron Advance) refrigerant.
- Indoor Units (NOT included): Up to six compatible Carrier indoor heads (wall-mounted, cassette, ducted, or floor/ceiling), selected and AHRI-matched separately based on room-by-room load calculations.
Installation Requirements & Accessories
- Voltage: 208/230V single-phase power supply.
- Minimum Circuit Ampacity (MCA): 40 A. Maximum Overcurrent Protection (MOCP): 45 A.
- Liquid line connections: 6x1/4in. Suction line connections: 4x3/8in+2x1/2in.
- Total maximum system piping length: 262.5 ft (80m) — actual indoor-to-outdoor run lengths depend on the indoor units selected.
- Line Set Sold Separately. No line set is included with this outdoor unit.
- Not Included: Indoor unit(s), wall sleeve, mounting bracket, line set, and electrical disconnect/whip.
- Not Compatible With: 115V-only circuits. This is a 208/230V unit only.
- Not a listed match for indoor units outside Carrier's AHRI-certified combinations for the 37MGRA outdoor family.
- Refrigerant: R-454B, an A2L mildly flammable classification requiring EPA Section 608 certified handling.
- Professional installation is required — this is not a pre-charged DIY quick-connect system.
Pro-Installer Tip
Flare connections on R-454B systems are unforgiving of shortcuts: an under-torqued or over-torqued flare nut on the 1/4in liquid line or 3/8in/1/2in suction lines is a common source of slow refrigerant leakage that shows up months later as reduced capacity or an intermittent fault code. Use a digital torque wrench set to the fitting manufacturer's spec, not a judgment-call tightening pass, and pull the system down with a calibrated micron gauge before charging — a slow leak that goes undetected accelerates compressor wear and undermines the system's rated SEER2/HSPF2 performance over its service life. Because this unit uses A2L refrigerant, an EPA Section 608 certification (Type II or Universal) is required to legally handle, recover, or charge R-454B in the field.
Key Benefits
- Variable-speed inverter-driven compressor delivers steady temperature control instead of on/off cycling.
- Rated for low-ambient heating operation down to -13°F.
- Outdoor sound pressure level of 65 dB(A) at this size.
- Supports up to six indoor zones from a single outdoor condenser.
- Puron Advance (R-454B) refrigerant reduces global warming potential by 75% versus older refrigerants while remaining non-ozone-depleting.
- ENERGY STAR certified at this size with up to 22 SEER2 / 9.6 HSPF2.
| Spec | Value | Unit |
|---|---|---|
| Model | 37MGRAQ55FA3 | — |
| Component Role | Outdoor condenser (outdoor unit only) | — |
| Cooling Capacity | 55000 | BTU/h |
| SEER2 | 22 | — |
| EER2 | 10 | — |
| HSPF2 (Region IV) | 9.6 | — |
| Voltage | 208/230 | V |
| Minimum Circuit Ampacity (MCA) | 40 | A |
| Maximum Overcurrent Protection (MOCP) | 45 | A |
| Outdoor Sound Pressure Level | 65 | dB(A) |
| Operating Range | -13 to 75 | °F |
| Zone Count | Up to 6 | zones |
| Refrigerant Type | R-454B (Puron Advance) | — |
| Net Weight | 237.88 | lbs |
| Liquid Pipe Connection | 6x1/4 | in |
| Suction Pipe Connection | 4x3/8 + 2x1/2 | in |
| Total Maximum Piping Length | 262.5 | ft |
| DIY Status | No — Professional Installation Required | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with dedicated 208/230V single-phase circuits sized to at least 40A MCA / 45A MOCP.
- Compatible with up to six Carrier indoor units in AHRI-certified matched combinations from the 37MGRA multi-zone family (indoor units sold separately).
- Not compatible with 115V-only circuits.
- Not a listed match for indoor units outside Carrier's published AHRI-certified combinations for this outdoor family.
- Line set is NOT included — this is a professional-install flare-connection system, not a pre-charged DIY kit.
- Wall sleeve and mounting bracket are NOT included.
FAQ
What breaker size do I need for this system?
This outdoor unit (37MGRAQ55FA3) has a Minimum Circuit Ampacity (MCA) of 40 A and a Maximum Overcurrent Protection (MOCP) of 45 A on a 208/230V single-phase circuit. Breaker sizing must not exceed the MOCP rating — confirm final sizing with a licensed electrician.
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, including EPA Section 608 certified handling and proper evacuation of the line set. Installation by a licensed HVAC professional is required to maintain warranty.
Is the line set included, and if not, what size do I need to buy?
Line sets are sold separately. This outdoor unit uses 6x1/4in liquid pipe connections and 4x3/8in+2x1/2in suction pipe connections, with a total maximum system piping length of 262.5 ft (80m). Indoor-side pipe sizing depends on the specific indoor units selected — refer to their installation instructions.
Does this system work in cold climates (low-ambient heating)?
Yes. The manufacturer-published operating range for this model is -13°F to 75°F, and it carries an HSPF2 (Region IV) rating of 9.6.
How many indoor units can this outdoor unit support?
This outdoor condenser supports up to six compatible indoor units in a multi-zone configuration, per Carrier's Performance 25 (37MGRA) family documentation.
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 for legal handling, recovery, and charging. 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. [NEEDS VERIFICATION] on exact registration deadline and full warranty terms — refer to the manufacturer warranty documentation in the Resources tab.
