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 bonus room, addition, or living space that central air doesn't reach.
The Air-Con Serene Series pairs an outdoor condenser with a single wall-mounted indoor head, AHRI-certified as a matched pair. This 18,000 BTU, 17 SEER configuration is Energy Star certified and designed for straightforward wall installation in a single room or zone. 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 ASRCI4H4S18
- Indoor Wall-Mounted Head: Model ASREM4H4S18
Installation Requirements & Accessories
- Voltage: 208-230V — not compatible with 115V-only circuits
- Includes 15ft lineset and wiring, per product title
- Line set sizing beyond the included 15ft length is sold separately; confirm exact diameter with a licensed installer
- Not a listed match for indoor/outdoor model families outside the ASRCI4H4S18 / ASREM4H4S18 AHRI-certified pairing
- Professional installation required — this is not a pre-charged DIY quick-connect system
Pro-Installer Tip
Flare connections on 18,000 BTU systems are a common source of slow refrigerant leaks if the flare face is scored or under-torqued. Use a digital torque wrench set to the manufacturer-specified value and inspect the flare with an eccentric flaring tool before final connection — a poorly seated flare leads to gradual charge loss, reduced capacity, and eventual compressor strain. Pull the system down below 500 microns with a calibrated micron gauge before opening service valves; this removes moisture and non-condensables that cause "E1"-type communication or high-pressure faults down the line. Refrigerant handling on this system falls under EPA Section 608 — only a certified technician should recover, evacuate, or charge the line set.
Key Benefits
- Inverter-driven compressor for variable-speed comfort and steady room temperature
- 17 SEER efficiency rating on the 18,000 BTU model
- Energy Star certified configuration
- AHRI-certified matched indoor/outdoor pairing
- Wall-mounted indoor head suited to straightforward single-room installation
Technical Table
| Spec | Value | Unit |
|---|---|---|
| Cooling Capacity | 18000 | BTU/h |
| SEER | 17 | — |
| Voltage | 208-230 | V |
| Indoor Unit Architecture | Wall Mounted | — |
| Zone Count | 1 | — |
| Outdoor Unit Model | ASRCI4H4S18 | — |
| Indoor Unit Model | ASREM4H4S18 | — |
| Energy Star Certified | Yes | — |
| AHRI Certified | Yes | — |
| Included Lineset Length | 15 | ft |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Outdoor unit ASRCI4H4S18 is AHRI-certified as a matched pair exclusively with indoor unit ASREM4H4S18
- Compatible with dedicated 208-230V single-phase circuits
- Not compatible with 115V-only circuits
- Not a listed match for other Serene Series indoor/outdoor model families (e.g., the 09K, 12K, or 24K pairs)
- Line set sizing beyond the included 15ft length is not included and must be sourced separately unless confirmed with your installer
FAQ
What breaker size do I need for this system?
Breaker size is [NEEDS VERIFICATION]. This system runs on a 208-230V dedicated circuit; confirm exact amperage and breaker sizing against the unit's nameplate and manufacturer manual before installation.
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 pre-charged DIY kit. Installation by a licensed HVAC professional is required to maintain the warranty and to properly evacuate the line set with a vacuum pump.
Is the line set included, and if not, what size do I need to buy?
The line set is sold separately. This listing includes a 15ft lineset and wiring per the product title; confirm exact line diameter sizing with your installer, as it is [NEEDS VERIFICATION] in the source specifications provided.
Does this system work in cold climates (low-ambient heating)?
Low-ambient heating performance data is [NEEDS VERIFICATION]. Refer to the manufacturer's Product Specifications in the Resources tab for cold-climate operating range details.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This system is Energy Star certified and AHRI certified as a matched outdoor/indoor pair. Refrigerant work must be performed by an EPA Section 608 certified technician. Full warranty terms are available in the manufacturer documentation — refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
