INTRO (0:00 to 0:30)
ON-SCREEN: C10-split-system-map.svg, full frame, title card: C10 SPLIT SYSTEM ANATOMY
VOICEOVER: In F4 you learned the refrigeration cycle as four jobs in a loop. In F9 you learned the wiring that runs it. Today the paper becomes metal. By the end of this video you will be able to point at every component of a residential split system and say what it is, what it does, and which station of the cycle it lives at. This is the vocabulary of the trade. Every diagnosis you will ever describe to another tech starts with naming the part correctly.
MAIN (0:30 to 4:15)
[0:30 to 1:10] Why the system is split, and the whole-system map
ON-SCREEN: C10-split-system-map.svg. Cursor traces outdoor unit, line set, indoor unit in order. Highlight callouts appear as each is named
VOICEOVER: A split system is the F4 loop cut into two boxes. The condenser needs outdoor air to dump heat into, so the heat-rejecting half goes outside: compressor, condenser coil, condenser fan, and the electrical gear that runs them. The evaporator needs indoor air to pull heat from, so the heat-absorbing half goes inside: the A-coil, the metering device, and a blower living in a furnace or an air handler. Two copper lines bridge the halves. One habit to set right now: the condenser is the coil, not the whole gray box. Customers call the cabinet the condenser. You should know better.
[1:10 to 2:00] Inside the outdoor unit
ON-SCREEN: C10-condenser-cutaway.svg. Cursor lands on each component as named: compressor, coil, fan, contactor, capacitor, service valves. Photo insert: real compressor terminal cover, real dual run capacitor
VOICEOVER: Inside the cabinet, three refrigeration parts and two electrical ones. The compressor, a sealed hermetic scroll in the base, is the pressure increaser and the only thing that circulates refrigerant. The condenser coil wraps the sides, thousands of aluminum fins giving heat a doorway into outdoor air. The fan on top pulls air through the coil and throws the house's heat at the sky. In the corner, the electrical compartment: the contactor, the 24 volt switch you traced in F9, and the dual run capacitor, one can serving both compressor and fan through its HERM, FAN, and C terminals. Capacitors are about 21 percent of all service calls, and the replacement rule from F8 still stands: beyond minus 6 percent of rated microfarads, it is done.
[2:00 to 2:50] The line set and the service valves
ON-SCREEN: C10-lineset-service-valves.svg. Cursor compares the two lines, then zooms to valve anatomy: stem, cap, Schrader port
VOICEOVER: The two lines are two different worlds. The suction line is the big insulated one: cold, low pressure, superheated vapor heading back to the compressor, 130 psig and about 55 degrees on the baseline day. The liquid line is the small bare one: warm, high pressure, subcooled liquid heading indoors, 365 psig and about 100 degrees. Common sizing is three eighths liquid and three quarter suction on 2 to 3 ton systems. Where the lines land on the outdoor unit, you find the service valves: a shutoff stem under a cap, and a Schrader service port, the only place your gauges ever touch the sealed system. The caps are the real seal. Cores weep. Every cap goes back on, every time.
[2:50 to 3:40] The indoor section
ON-SCREEN: C10-evaporator-airflow-path.svg. Cursor follows the airflow arrows: return, filter, blower, A-coil, supply. Highlight on TXV, drain pan, float switch
VOICEOVER: Indoors, return air gets pulled through the filter by the blower and pushed up through the A-coil, two slanted slabs of finned tube where 45 degree refrigerant boils and the house's heat leaves the air. At the coil inlet, the metering device, usually a TXV, drops the pressure, the F4 pressure dropper in the flesh. The blower lives in a gas furnace with a cased coil on top, or in an air handler that packages blower, coil, and electric heat in one cabinet. Either way the target is 400 CFM per ton across that coil. Below the coil, the drain pan and its sloped three quarter inch drain line, and on that pan, a float switch that kills the system before a clogged drain becomes a ceiling stain. And one number to file for the diagnostics track: about 80 percent of refrigerant leaks are found in the A-coil.
[3:40 to 4:15] The drier and the accessory shelf
ON-SCREEN: C10-accessory-gallery.svg. Cursor moves through the panels: filter drier with arrow, float switch, hard start kit, surge protector, condensate pump strip
VOICEOVER: In the liquid line, the filter drier: a desiccant core that traps moisture and debris before they reach the metering device. Flow arrow toward the indoor coil, one-time use, and replaced every single time the sealed system is opened. Around the system, the supporting cast: the float switch you just met, a surge protector that clamps voltage spikes before they kill boards, a hard start kit that cuts compressor starting inrush by 50 to 70 percent on aging equipment, and a condensate pump for installs where gravity cannot drain the pan.
OUTRO (4:15 to 4:30)
ON-SCREEN: C10-split-system-map.svg returns, with the F4 cycle loop overlaid in the corner
VOICEOVER: Every part you just met is a station on the F4 cycle or a rung on the F9 ladder. In the demo video, Darrel walks a real system end to end, and in your practical you will do the same walk yourself, out loud, with every component named. Watch the demo, then go put your hands on a unit.