Mitsubishi 9,000 BTU R454B Ceiling Cassette Heat Pump System
The SUZ-AA09NL-U1 outdoor heat pump and SLZ-AF09NL-U1 four-way ceiling cassette ship as a factory-matched single-zone package rated at 9,000 BTU/h cooling and 12,000 BTU/h heating at 47°F, running on low-GWP R454B refrigerant. This is the highest-efficiency pairing in the SLZ-AF cassette line at 21 SEER2, 13.2 EER2, and 11.8 HSPF2, and it arrives complete with the SLP-18FAU architectural grille and the MHK2 kumo touch wireless thermostat already in the box — no separate grille or controller order required. The recessed cassette drops into a standard 2 ft × 2 ft suspended ceiling grid and discharges air in four directions, making it a clean fit for bedrooms, home offices, dental operatories, server closets, and small retail suites where a wall-mounted head would be visually intrusive.
Is a 9,000 BTU Ceiling Cassette System the Right Size?
Nine thousand BTU is the entry point of this Mitsubishi cassette line and generally suits a single conditioned room in the neighborhood of 300 to 450 square feet with average ceiling height and modern insulation. What makes this particular capacity useful is not the peak number but the bottom of its range: the inverter modulates down to 2,300 BTU/h in cooling, so a small, lightly loaded room gets long, low-speed runtime instead of short cycles, which is what actually pulls humidity out of the air.
Square footage alone will not size a system. West-facing glass, cathedral ceilings, poor attic insulation, kitchen or equipment heat gain, high occupancy, and coastal humidity all raise the calculated load, while a well-shaded interior room with tight construction may need less than the rule of thumb suggests. On the heating side, this pairing still produces 7,800 BTU/h at 17°F outdoors and operates down to -4°F, so a Manual J load calculation should be run against your design temperature rather than assuming nameplate capacity holds at every condition.
Ideal for: Master bedrooms, home offices and studies, dental and medical exam rooms, small conference rooms, boutique retail bays, salon suites, church offices, and finished attic or bonus rooms with a drop ceiling or accessible joist bay.
Need more capacity? Step up to the 12,000 BTU Mitsubishi SUZAA12NL & SLZAF12NL Ceiling Cassette System for larger rooms and open-plan spaces that need additional cooling and heating capacity.
Recommended applications are general guidelines only. Actual system requirements depend on insulation, window area, ceiling height, occupancy, internal heat gain, and local design temperatures. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | SUZ-AA09NL-U1 — 9,000 BTU/h Inverter Heat Pump Condenser |
|---|---|
| Indoor Unit | SLZ-AF09NL-U1 Four-Way Ceiling-Recessed Cassette |
| Cassette Grille | SLP-18FAU Architectural Grille — Included |
| Controller | MHK2 kumo touch RedLink Wireless Wall Thermostat — Included |
| Application | Single-Zone Ductless Ceiling Cassette Heat Pump System |
| Refrigerant | R454B (A2L, Low GWP) |
| Cooling / Heating | 9,000 BTU/h Cooling — 12,000 BTU/h Heating at 47°F |
| Efficiency | 21 SEER2 / 13.2 EER2 / 11.8 HSPF2 |
| Electrical | 208/230V, Single Phase, 60 Hz — MCA 13A, MOCP 22A |
| Line Set Connections | 1/4 in. Liquid × 3/8 in. Gas, Flared |
| Maximum Line Length | 65 ft. with 40 ft. Maximum Height Difference |
| Manufacturer Warranty | 10 Years |
Buying this pairing as a matched package matters more than it does on a conventional split. The inverter board in the SUZ-AA09NL-U1 is programmed for the specific coil and blower curve of the SLZ-AF09NL-U1, so the two hold rated capacity and rated efficiency together at part load. The grille is not optional hardware on this cassette — the SLZ chassis will not finish out without it, and the SLP-18FAU grille is bundled here rather than sold separately. The MHK2 wireless thermostat kit is included as well, giving you a conventional wall-mounted temperature sensor and schedule instead of relying on a handheld remote. Line set, control wiring, and a disconnect are field-supplied; matched ductless mini split copper line sets are available in 15, 25, and 50 ft. lengths. Installation, evacuation, and startup must be performed by an EPA 608 certified technician trained on A2L refrigerants.
Outdoor Unit & Ceiling Cassette Features
SUZ-AA09NL-U1 Outdoor Heat Pump
- Inverter-driven compressor modulating from 2,300 to 9,000 BTU/h in cooling for continuous low-speed dehumidification
- 21 SEER2 and 13.2 EER2 — the highest rated efficiency of any SUZ-AA and SLZ-AF cassette pairing
- 11.8 HSPF2 with a 3.8 COP at 47°F, and 7,800 BTU/h of heating still available at 17°F outdoors
- Heating operation down to -4°F and cooling down to 23°F, or 0°F with the optional wind baffle installed
- Charged with R454B, an A2L refrigerant with substantially lower global warming potential than R410A
- Factory precharged with 2 lb. of R454B, covering line sets up to 25 ft. with no field top-off
- Compact 31-1/2 in. wide by 11-1/4 in. deep by 21-11/16 in. high cabinet weighing only 81 lb.
- 48 dB(A) in cooling and 50 dB(A) in heating, quiet enough for a side yard or a tight lot line
- 1,229 CFM cooling airflow through a corrosion-resistant coil with a hinged service panel and valve cover
- 208/230V single-phase power with a 13A minimum circuit ampacity, allowing a small dedicated circuit
SLZ-AF09NL-U1 Four-Way Ceiling Cassette
- Recesses into a standard 2 ft. × 2 ft. suspended ceiling grid with only 8-3/16 in. of plenum depth required
- Four-way discharge with independently controlled vanes producing 72 distinct airflow patterns
- Individual vanes can be closed off for corner or wall-adjacent installations without rebalancing the room
- Whisper-quiet 25 dB(A) on low speed, rising to only 31 dB(A) at high fan
- Three-speed airflow at 230, 265, and 300 CFM to match the room's throw and noise requirements
- Built-in condensate lift pump raising drainage up to 33 in. above the unit for flexible drain routing
- Included SLP-18FAU grille finishes the ceiling opening flush with a clean architectural appearance
- Included MHK2 kumo touch wireless thermostat with RedLink communication and 7-day scheduling
- Compatible with the optional 3D i-see Sensor for occupancy-based and location-based comfort control
- Lightweight 31 lb. chassis measuring 22-7/16 in. square, simplifying single-installer ceiling mounting
Specifications & Manuals
Documentation covers both halves of the system: outdoor unit specifications, installation and service procedures, and parts breakdowns for the SUZ-AA09NL-U1, plus technical data, ceiling installation instructions, service literature, and parts identification for the SLZ-AF09NL-U1 cassette.
Frequently Asked Questions
Do I have to buy the SLP-18FAU grille separately with this system?
No. The SLP-18FAU architectural grille is included in this package. The SLZ-AF09NL-U1 cassette chassis cannot be finished out without a grille, so it is bundled here rather than quoted as a separate line item.
What does the included MHK2 controller actually do?
The MHK2 kumo touch kit provides a wall-mounted RedLink wireless thermostat with 7-day programmable scheduling and a receiver that wires to the cassette. It lets you control the system from a fixed wall location and sense room temperature away from the ceiling, rather than depending on a handheld infrared remote.
How much ceiling depth does the SLZ-AF09NL-U1 need above the grid?
The cassette body is 8-3/16 in. high and 22-7/16 in. square, so it requires roughly that much clear plenum depth plus room for the refrigerant flares, condensate line, and hanging rods above a standard 2 ft. × 2 ft. ceiling grid.
Is R454B a drop-in replacement for R410A in existing line sets?
No. R454B is a mildly flammable A2L refrigerant and requires new line sets, A2L-rated service tools, and technicians trained on A2L handling. Existing R410A or R22 piping must not be reused with this system.
How far can the outdoor unit sit from the cassette?
The SUZ-AA09NL-U1 allows up to 65 ft. of refrigerant piping with a maximum height difference of 40 ft. between the two units. The 2 lb. factory charge covers runs up to 25 ft. with no additional refrigerant required.
Which spaces is a 9,000 BTU cassette typically installed in?
Bedrooms, home offices, dental and medical exam rooms, small conference rooms, boutique retail bays, salon suites, and finished bonus rooms — anywhere a single room needs quiet, discreet conditioning and a wall-hung head would be visually intrusive.
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