This is a single-zone ductless mini split system for cooling and heating one room without ductwork. It's built for homeowners adding comfort to a bedroom, addition, or office that central air doesn't reach.
The Air-Con Titanium Series pairs a wall-mounted indoor head (model ATUEM4H1S12) with a matched outdoor condenser (model ATUCI4H1S12), rated together at 12,000 BTU/h cooling with an 18 SEER efficiency rating. This wall-mount configuration is designed for straightforward mounting on any interior wall with adequate clearance to the outdoor unit. AHRI-certified performance data is published for this ODU/IDU pairing. 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 Unit — Model ATUCI4H1S12
- Indoor Wall-Mounted Unit — Model ATUEM4H1S12
Installation Requirements & Accessories
- Voltage: 208-230V (per manufacturer specification table)
- Line set size: [NEEDS VERIFICATION] — not specified in manufacturer data
- Line Set Sold Separately — this is not a pre-charged DIY kit
- Not compatible with 115V-only circuits
- Wall mounting bracket for indoor unit — refer to Resources tab for inclusion details; not confirmed in provided data
Pro-Installer Tip
Flare connections on 12,000 BTU systems are a common source of slow refrigerant leaks when torque is eyeballed instead of measured. Under-torquing a flare nut leads to gradual refrigerant loss that shows up months later as reduced cooling capacity or an "E1" communication fault at the indoor head. Use a digital torque wrench set to the fitting's specified value, and always evacuate the line set below 500 microns with a calibrated vacuum gauge before opening the service valves. This is not optional — EPA Section 608 certification is required to purchase and handle refrigerant, and a proper deep vacuum is what keeps the system's rated SEER performance intact over its service life.
Key Benefits
- Variable-speed inverter-driven compressor for steady temperature control
- 18 SEER rated efficiency for the 12,000 BTU capacity
- Wall-mounted indoor head suited to bedrooms, offices, and additions
- AHRI-certified matched ODU/IDU pairing (ATUCI4H1S12 / ATUEM4H1S12)
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Cooling Capacity | 12,000 | BTU/h |
| SEER | 18 | SEER |
| Voltage | 208-230 | V |
| Outdoor Unit Model | ATUCI4H1S12 | — |
| Indoor Unit Model | ATUEM4H1S12 | — |
| Indoor Unit Architecture | Wall Mounted | — |
| Zone Count | 1 | zone |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Compatible only as a matched pair: outdoor unit ATUCI4H1S12 with indoor unit ATUEM4H1S12, per AHRI certification.
- Requires a dedicated 208-230V single-phase circuit.
- Not compatible with 115V-only circuits.
- Line set is not included and must be purchased separately.
- Not a listed match for other Titanium Series capacities (e.g., the 9,000 BTU ATUCI4H1S09 / ATUEM4H1S09 pairing) — do not mix ODU/IDU models across capacity classes.
FAQ
What breaker size do I need for this system?
[NEEDS VERIFICATION] — breaker size is not specified in the manufacturer data provided.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is a standard flare-connection system, not a DIY pre-charged kit. Professional installation by a licensed HVAC technician is required to maintain the manufacturer warranty.
Is the line set included, and if not, what size do I need to buy?
The line set is not included with this system. Line set size is [NEEDS VERIFICATION] — not specified in the manufacturer data provided.
Does this system work in cold climates (low-ambient heating)?
Low-ambient heating performance and operating temperature range are [NEEDS VERIFICATION] — not specified in the manufacturer data provided.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. Refrigerant handling on this system must be performed by an EPA Section 608-certified technician. Refer to the "Resources (System Manuals and Warranty)" tab above for full warranty terms and manufacturer documentation.
