This is a Carrier indoor floor/ceiling console unit — the 24K BTU size in the 45MCFA family. It's the indoor half of a ductless system only; it requires a matched outdoor condenser, refrigerant line set, and installation accessories, all sold separately. This unit is for homeowners who want a low-profile indoor head that mounts near the floor or under a ceiling, instead of a wall-mounted or cassette style head.
The Carrier 45MCFA Performance Underceiling Console is an indoor-only component designed for floor or under-ceiling mounting, built to integrate into single-zone or multi-zone ductless setups. It includes a wireless temperature-sensing handheld remote and five fan speeds for airflow control. 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
- Indoor unit: Carrier 45MCFAQ24XA3, 24K BTU floor/ceiling console, part of the 45MCFA family
- Outdoor condensing unit: not included — must be purchased and matched separately
- Wireless handheld remote controller: included with this indoor unit
Installation Requirements & Accessories
- Voltage: 208/230V; 1Ph; 60Hz
- Refrigerant: R-454B (Puron Advance), an A2L mildly flammable classification — professional installation required
- Line set: NOT included — sold separately, sized to match your chosen outdoor unit
- Not included: outdoor condenser, wall sleeve, mounting bracket, installation grille
- Not compatible with: unmatched or unlisted outdoor unit families; this unit is not a standalone complete system
- Professional Installation Required — this is not a DIY/pre-charged line set product
Pro-Installer Tip
Flare connections on Puron Advance (R-454B) systems need to be torqued to spec and leak-checked carefully — a loose or over-torqued flare on the liquid line is a common source of slow refrigerant loss and nuisance fault codes down the road. Verify the joint with a digital torque wrench rather than "feel," and pull the system down to the vacuum level specified in the installation manual before charging. Because R-454B is an A2L mildly flammable refrigerant, technicians must hold current EPA Section 608 certification and follow A2L-specific handling and leak-detection practices during installation and service.
Key Benefits
- Five fan-speed settings for tailored airflow control
- Sound levels as low as 29 dBA for quiet indoor operation
- Compatible with both single-zone and multi-zone outdoor configurations
- Wireless temperature-sensing remote included
- Uses Puron Advance (R-454B) refrigerant, rated for reduced global warming potential versus older refrigerants
- Low-profile floor/ceiling mounting reduces the need for extensive renovation
| Spec | Value | Unit |
|---|---|---|
| Component Role | Indoor floor/ceiling console unit (indoor only) | — |
| Model | 45MCFAQ24XA3 | — |
| Cooling Rated Capacity (DOE A2 - 95°F) | 24000 | Btu/h |
| Heating Rated Capacity (DOE H12 - 47°F) | 29000 | Btu/h |
| Sound Level | As low as 29 | dBA |
| Voltage | 208/230; 1Ph; 60 | V;Ph;Hz |
| Refrigerant | R-454B (Puron Advance) | — |
| SEER2 / HSPF2 / EER2 | Dependent on paired outdoor unit | — |
| Breaker Size / MCA / MOP | [NEEDS VERIFICATION] | A |
| Line Set Size | [NEEDS VERIFICATION] | in |
| Operating Temperature Range | [NEEDS VERIFICATION] | °F |
| DIY Status | No — Professional Installation Required | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with single-zone or multi-zone Carrier system configurations when matched with an appropriate outdoor unit
- Requires a 208/230V; 1Ph; 60Hz electrical supply
- Not compatible with 115V-only circuits
- Not a complete system on its own — outdoor condensing unit is not included and must be purchased separately
- Line set, wall sleeve, mounting bracket, and installation grille are NOT included
- Not a listed match for outdoor unit families outside Carrier's published AHRI-matched combinations for the 45MCFA indoor series — confirm exact outdoor pairing before ordering
FAQ
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. This unit uses R-454B refrigerant (an A2L mildly flammable refrigerant) and professional installation is required.
Is the line set included, and if not, what size do I need to buy?
The line set is not included and is sold separately. Exact liquid and suction line sizes for this indoor unit are [NEEDS VERIFICATION] — the manufacturer data provided lists pipe sizes by outdoor unit size code, not confirmed against this specific indoor model pairing. Confirm sizing with your installer against the outdoor unit you pair this with.
Does this system work in cold climates (low-ambient heating)?
Low-ambient heating performance depends on the outdoor unit this indoor console is paired with. Cooling and heating efficiency (SEER2, HSPF2, EER2) are system-level ratings, not properties of this indoor unit alone.
What breaker size do I need for this system?
Breaker/circuit sizing depends on the paired outdoor unit's MCA and MOP ratings. For this indoor unit alone, exact breaker size is [NEEDS VERIFICATION].
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L mildly flammable) refrigerant, and installation must comply with applicable ANSI/ASHRAE 15 and EPA Section 608 requirements. Carrier's Consumer Choice Warranty, upon timely registration on eligible equipment, offers a choice of a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty; confirm exact terms and registration requirements in the manufacturer documentation referenced above.
