INTRO (0:00 to 0:30)
VOICEOVER: A mini-split is the split system you already know with the ductwork deleted. Outdoor unit, line set, indoor unit. The difference is that the indoor unit hangs in the room it serves, so there are no duct losses, no duct path needed, and no sharing. Mini-splits have a reputation for losing refrigerant, and that reputation was built one hand-tightened flare at a time. In the next four minutes: the equipment family, single-zone versus multi-zone, the five places install quality lives, and the behaviors that make techs condemn healthy multi-zone systems.
ON-SCREEN: A35-mini-split-anatomy.svg, full frame
MAIN (0:30 to 4:15)
[0:30-1:15] The family, and inverter by default
VOICEOVER: Four indoor unit shapes. Wall-mounted heads, the default: tangential blower wheel, wrap-around coil, washable prefilters, motorized louvers. Ceiling cassettes that recess flush and throw four ways. Floor consoles for rooms with no high wall. And slim-duct air handlers hidden above a ceiling feeding two or three short runs. All four connect the same way: liquid line, suction line, power plus communication cable, condensate drain.
And every one of them is an inverter system. There is no fixed-speed mini-split worth talking about. From A33, that means capacity varies continuously, long low runtimes are healthy, and pressures float with compressor speed, which is why ductless charging is weigh-in per C17, never gauge-and-feel. Awareness level here: when an inverter board fault takes you into DC bus and drive diagnostics, that depth lives in A33.
ON-SCREEN: A35-mini-split-anatomy.svg with the four indoor unit types highlighted in sequence, then text overlay: Inverter by default. Charge by weight, C17.
[1:15-2:00] Single-zone, multi-zone, and the tables that govern both
VOICEOVER: Single-zone is one outdoor unit, one head: dedicated capacity, simplest, best performing. Multi-zone feeds two to eight heads from one outdoor unit, either through individual ports with home-run line sets, or through a branch box, a serviceable manifold with electronic expansion valves inside. Three numbers govern every multi-zone design, and all three come from the manufacturer tables: per-zone line length and lift, total combined piping, and the connected capacity ratio, commonly up to 130 percent of outdoor capacity. Single-zone limits are typically 50 to 66 feet of line with 16 to 33 feet of lift, but the only number that counts is the one in the manual for the unit on the job.
ON-SCREEN: A35-multi-zone-piping.svg. Callout text: Per-zone limit. Total limit. Connected ratio up to 130 percent. The manual is the law.
[2:00-3:00] Where install quality lives
VOICEOVER: Five places. One: placement. The head needs clear airflow throw across the room, a gravity path for condensate, and service access for future cleaning. Two: the line set, inside the length and lift tables, supported every 4 feet, both lines insulated separately, 3/4 inch minimum. Three: the flare, the number one leak point in ductless work. Fresh cut, deburr face down, nut on first, oil on the cone back and never the threads, then a torque wrench: 10 to 14 foot pounds at 1/4 inch, 24 to 31 at 3/8, 36 to 45 at 1/2, 45 to 60 at 5/8, confirmed against the manual. Four: evacuation to 500 microns with a passing decay test through the suction service port, before the holding charge is released, because opening those hex valves is irreversible without a recovery machine. Five: electrical. Dedicated circuit at nameplate MCA, weatherproof disconnect within sight, and one continuous communication cable, terminal numbers matched at both ends, no splices, no swapped pairs.
ON-SCREEN: A35-flare-torque-discipline.svg for the flare beat, then text overlay: 500 microns, decay test, THEN open the valves.
[3:00-3:45] Condensate, and the multi-zone behaviors that fool techs
VOICEOVER: Condensate gets out by gravity at a continuous quarter inch per foot, or by a pump. A pump is a wear item: floats stick, check valves fail, tubing chokes with slime, and the safety switch only saves the wall if somebody wired it. Pour water until the pump runs, keep pouring until the safety shuts the system down. That is the test.
Multi-zone systems also generate calls where nothing is broken. One small zone calling can sit below the outdoor unit's minimum capacity, so the system bleeds a little refrigerant through idle heads, which is why an off head can sweat or blow slightly cool by design. All zones calling at once share rated capacity proportionally, so the hottest room loses on the worst afternoon. And oversized heads satisfy fast, shut down, and let coil moisture evaporate back into the room: 74 degrees and clammy. Read the service manual before condemning a valve, and size to the Manual J before quoting heads.
ON-SCREEN: A35-condensate-management.svg, then A35-multi-zone-piping.svg with the one-zone-calling panel highlighted
[3:45-4:15] Service life, and the refrigerant note
VOICEOVER: In service, the head lives with the dust. Owners rinse the prefilters monthly. Techs do the bib kit job: wrap the head, wash the coil and the blower wheel until the rinse runs clean, flush the drain. Diagnostics start at the fault code, blink patterns on the head or codes through the remote, and communication faults get worked in order: power cycle, verify voltage, inspect terminals, hunt splices and swaps, then measure the comm line per the service manual before any board gets condemned. Last note: new ductless equipment ships with R-32 or R-454B. Every A31 rule applies, left-hand threads, red band cylinders, A2L-rated equipment, before your hoses touch a port.
ON-SCREEN: A35-communication-fault-flow.svg, then text overlay: New mini-splits are A2L. A31 rules apply.
OUTRO (4:15 to 4:30)
VOICEOVER: Mini-splits are not fragile. They are precise. The torque table, the 500-micron decay test, and the manufacturer tables are the whole difference between a system that runs twenty years and one that earns the reputation. In the demo video, Darrel makes the flare, pulls the vacuum, and opens up a working head. Watch his hands, then pass the quiz.
ON-SCREEN: Torque the flare. Prove the vacuum. Respect the tables.