This is a 2-zone ductless mini split system for cooling and heating two separate rooms from one outdoor condenser, without ductwork. It's built for homeowners who need independent temperature control in two spaces — for example a bedroom and a living room, or two additions — off a single outdoor unit.
The AMSCI4H4S18 outdoor condenser is the 18,000 BTU, 22 SEER, 208-230V outdoor unit for this 2-zone listing, AHRI-certified and Energy Star-certified per the manufacturer's Multi Split Series specification table. Indoor heads on this listing pair only with the AMSCI4H4S18 outdoor condenser — not with any other outdoor model in the Air-Con lineup. Available indoor head types include wall-mounted (ABXEM4H4S09, ABXEM4H4S12), slim one-way ceiling cassette (ASLEC4H4S09), and concealed duct (ASLEK4H4S09, ASLEK4H4S12), selectable by variant below. 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: AMSCI4H4S18 — 18,000 BTU/h cooling capacity, 22 SEER, 208-230V, single outdoor unit supporting 2 indoor zones.
- Indoor Head 1 & 2 (selectable by variant): wall-mounted (ABXEM4H4S09 or ABXEM4H4S12), slim one-way ceiling cassette (ASLEC4H4S09), or concealed duct (ASLEK4H4S09 or ASLEK4H4S12).
Installation Requirements & Accessories
- Voltage: 208-230V single-phase, required for both the outdoor condenser and all indoor head options listed.
- Line set sizing is [NEEDS VERIFICATION] — not specified in the manufacturer data provided for this listing.
- Line Set Sold Separately — not included with any variant of this system.
- Wall sleeve and mounting bracket are NOT included.
- Not compatible with 115V-only circuits.
- Not a listed match for outdoor condenser models outside the AMSCI4H4S18 family (e.g., AMSCI4H4S24, AMSCI4H4S36, AMSCI4H4S42 are separate listings with their own matched indoor combinations).
- Professional installation is required — this is not a pre-charged DIY kit.
Pro-Installer Tip
On 2-zone flare-fitting systems like this one, the most common comeback call is a slow refrigerant leak at one of the four flare joints (two per indoor head, at the branch box or outdoor unit). Over-torqued or under-torqued flares crack the seat or never seat fully, and either way you lose charge slowly enough that the customer doesn't call for weeks — then one zone starts throwing an "E1" or low-charge fault. Torque every flare nut to spec with a calibrated digital torque wrench rather than "feel," and pull the system down below 500 microns with a micron gauge before opening the service valves — don't rely on the compressor's built-in gauge. This is standard EPA Section 608 practice for any technician handling refrigerant, and it directly protects the system's rated 22 SEER efficiency by keeping the charge at nameplate spec.
Key Benefits
- Inverter-driven outdoor compressor for variable speed comfort across both zones, rather than blunt on/off cycling.
- Independent control of two rooms from a single outdoor condenser — no need for two separate outdoor units.
- Choice of indoor architecture per zone: wall-mounted, slim one-way cassette, or concealed duct, matched to the room's ceiling and wall constraints.
- 22 SEER outdoor unit rating supports lower cooling operating costs versus older single-stage systems.
- AHRI-certified and Energy Star-certified system combination.
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Outdoor Unit Cooling Capacity | 18000 | BTU/h |
| SEER | 22 | SEER |
| Voltage | 208-230 | V |
| Zone Count | 2 | zones |
| DIY Status | No — Professional Installation Required | — |
| Energy Star Certified | Yes | — |
| AHRI Certified | Yes | — |
| Outdoor Unit Model | AMSCI4H4S18 | — |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Options & SKUs
| Variant | SKU | Price (USD) |
|---|---|---|
| ABXEM4H4S09 + ABXEM4H4S09 | AMSCI4H4S18-2ZONE-ABXEM4H4S09-ABXEM4H4S09 | 1988.00 |
| ABXEM4H4S09 + ABXEM4H4S12 | AMSCI4H4S18-2ZONE-ABXEM4H4S09-ABXEM4H4S12 | 2068.00 |
| ABXEM4H4S09 + ASLEC4H4S09 | AMSCI4H4S18-2ZONE-ABXEM4H4S09-ASLEC4H4S09 | 2355.00 |
| ASLEC4H4S09 + ABXEM4H4S12 | AMSCI4H4S18-2ZONE-ASLEC4H4S09-ABXEM4H4S12 | 2338.00 |
| ASLEC4H4S09 + ASLEC4H4S09 | AMSCI4H4S18-2ZONE-ASLEC4H4S09-ASLEC4H4S09 | 2610.00 |
| ASLEK4H4S09 + ASLEK4H4S09 | AMSCI4H4S18-2ZONE-ASLEK4H4S09-ASLEK4H4S09 | 2255.00 |
| ASLEK4H4S09 + ASLEK4H4S12 | AMSCI4H4S18-2ZONE-ASLEK4H4S09-ASLEK4H4S12 | 2245.00 |
Compatibility & Fitment
- Compatible with dedicated 208/230V single-phase circuits only.
- The AMSCI4H4S18 outdoor condenser is matched only to the indoor head combinations listed above in the Options & SKUs table.
- Slim one-way cassette indoor head (ASLEC4H4S09) is designed to fit standard joist-bay ceiling framing; exact clearance dimensions are [NEEDS VERIFICATION].
- Not compatible with 115V-only circuits.
- Not a listed match for other Air-Con outdoor condenser models (AMSCI4H4S24, AMSCI4H4S36, AMSCI4H4S42) or their respective indoor unit families.
- Line set, wall sleeve, and mounting bracket are NOT included with any variant.
FAQ
What breaker size do I need for this system?
Breaker size is [NEEDS VERIFICATION]. The system operates on a 208-230V single-phase circuit; confirm exact breaker/amperage with the manufacturer's electrical data sheet before rough-in.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY, pre-charged system. Professional installation by a licensed HVAC contractor is required, including vacuum evacuation and flare connections at both indoor heads and the outdoor condenser.
Is the line set included, and if not, what size do I need to buy?
Line sets are not included. Exact line set diameters and lengths for each of the two indoor connections are [NEEDS VERIFICATION] — confirm sizing against the installation manual for your selected indoor unit combination.
Will the ceiling cassette fit between standard 16-inch on-center joists?
The ASLEC4H4S09 cassette option is a slim one-way ceiling cassette. Exact joist-bay clearance dimensions are [NEEDS VERIFICATION] in the supplied data; confirm against the manufacturer's installation manual before framing.
Does this system work in cold climates (low-ambient heating)?
Low-ambient heating performance data was not provided for this listing and is [NEEDS VERIFICATION]. Refer to the manufacturer's Product Specifications for published heating operating ranges.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This system is AHRI-certified and Energy Star-certified as a matched outdoor/indoor combination. Refrigerant handling must be performed by an EPA Section 608-certified technician. Full warranty terms, manuals, and brochure are available under the "Resources (System Manuals and Warranty)" Tab above.
