This is the indoor high-wall unit only — a 36,000 BTU/h ductless fan coil that mounts on the wall of the room it conditions. It's for homeowners or installers who already have (or are ordering separately) a matched Carrier outdoor condenser and need the correct indoor head to pair with it.
The 45MAHAQ36XA3 is Carrier's Performance High Wall indoor fan coil in the 36K size, part of the 45MAHA family. It uses Puron Advance (R-454B) refrigerant and is designed to pair with select Carrier outdoor condensers in single- or multi-zone configurations. 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 Performance High Wall fan coil, model 45MAHAQ36XA3 (family 45MAHA, size 36)
- Outdoor condensing unit: sold separately — not included in this listing
- Wireless remote controller: included with this indoor unit
Installation Requirements & Accessories
- Refrigerant: R-454B (Puron Advance), charge amount for this size is 7.05 lb (3.2 kg) at the indoor unit's rated charge portion
- Liquid pipe: 3/8 in (9.52 mm)
- Suction pipe: 5/8 in (15.9 mm)
- Line set is NOT included — must be purchased separately and sized per the piping data above
- Wall sleeve, mounting bracket, and grille are NOT included where applicable
- Outdoor unit is NOT included — must be selected as a matched AHRI-certified pairing
- Professional installation required — R-454B is a mildly flammable (A2L) refrigerant subject to EPA Section 608 handling requirements
- Voltage: [NEEDS VERIFICATION] — the source data lists 115V and 208/230V supply options across the 45MAHA family but does not confirm which applies specifically to the 36K (size 36) indoor unit
Pro-Installer Tip
Flare connections on R-454B systems must be torqued to the fitting manufacturer's spec and leak-checked before charging — an under-torqued or scored flare face is the most common source of slow refrigerant loss and callback "low charge" complaints on high-wall units. Evacuate the line set and indoor coil to the manufacturer's specified vacuum level before opening the service valves; skipping this step traps moisture and non-condensables that show up later as reduced capacity or compressor strain. Use a calibrated digital torque wrench sized for the 3/8 in and 5/8 in fittings on this unit, and verify vacuum with a digital micron gauge rather than by feel. Because R-454B is a mildly flammable A2L refrigerant, only an EPA Section 608-certified technician should handle recovery, evacuation, and charging on this system.
Key Benefits
- Puron Advance (R-454B) refrigerant reduces global warming potential by 75% compared to older refrigerants while remaining non-ozone-depleting
- Sound level as low as 16 decibels (family-stated minimum) for quiet indoor operation
- Supports single-zone or multi-zone system configurations
- Wireless remote controller included
- Select outdoor pairings qualify for ENERGY STAR® certification
- Consumer Choice Warranty available upon timely registration: 10-year parts-only limited warranty, or 5-year parts plus 3-year labor limited warranty, on eligible equipment
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Model | 45MAHAQ36XA3 | — |
| Family | 45MAHA | — |
| Component Role | Indoor High-Wall Unit Only | — |
| Cooling Rated Capacity | 36000 | Btu/h |
| Refrigerant Type | R-454B (Puron Advance) | — |
| Refrigerant Charge Amount | 7.05 (3.2) | lb (kg) |
| Liquid Pipe Size | 3/8 (9.52) | in (mm) |
| Suction Pipe Size | 5/8 (15.9) | in (mm) |
| Net Weight | 150.36 | lb |
| Gross Weight | 160.28 | lb |
| Sound Level (family-stated minimum) | 16 | dBA |
| Voltage | [NEEDS VERIFICATION] | — |
| SEER2 / HSPF2 / EER2 | Dependent on paired outdoor unit | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible with select Carrier outdoor condensers as part of an AHRI-certified matched pairing; confirm the specific outdoor model against Carrier's published match-up documentation before ordering
- NOT a complete system — the outdoor condenser, line set, wall sleeve, mounting bracket, and grille are not included in this listing
- NOT compatible with any outdoor unit not listed as a certified match for the 45MAHA family, size 36
- Line set must be field-supplied and sized to 3/8 in liquid / 5/8 in suction for this size
FAQ
Is the outdoor unit included with this listing?
No. This listing is the indoor high-wall unit only (model 45MAHAQ36XA3). The matched outdoor condenser, line set, and mounting accessories are sold separately.
Is the line set included, and if not, what size do I need to buy?
The line set is not included. Based on the manufacturer's piping table for this size (36), the liquid line is 3/8 in and the suction line is 5/8 in.
Is professional installation required?
Yes. This unit uses R-454B (A2L) refrigerant and requires professional installation by a licensed HVAC technician.
What is the SEER2 or HSPF2 rating of this unit?
SEER2, HSPF2, and EER2 are system-level ratings that depend on which outdoor unit this indoor head is paired with. They are not fixed specifications of the indoor unit alone.
What breaker size do I need for this system?
Breaker sizing depends on the paired outdoor unit's electrical data (MCA/MOP), not on the indoor unit alone. [NEEDS VERIFICATION] — confirm using the outdoor unit's nameplate and installation manual.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L, mildly flammable) refrigerant; handling, recovery, and charging must be performed by an EPA Section 608-certified technician. Upon timely registration, eligible equipment qualifies for Carrier's Consumer Choice Warranty: a 10-year parts-only limited warranty, or a 5-year parts plus 3-year labor limited warranty.
