ADP (Advanced Distributor Products)
Lennox International’s coil house: evaporator coils and air handlers sold through distribution to match many condenser brands. Read the COIL’s nameplate — its metering device and rating, not the condenser badge, decide the charge behavior.
The family: Lennox, the Allied Air set (Armstrong Air, AirEase, Ducane, Concord), ADP coils and air handlers, and Magic-Pak wall units.
Same family: Lennox, Armstrong Air, AirEase, Ducane, Concord, Magic-Pak
What they make
Evaporator coil
Covered in the simulatorThe indoor coil itself — cased or uncased, A, N or slab — often replaced separately from everything else, which is where mismatches are born.
Freeze-ups, restrictions, airflow starvation and mismatched-coil audits are all on the board, and the guided flow’s superheat/subcooling paths read straight through it. Match by capacity and metering device, never by badge.
Start a guided call →Practice: gauges on →Practice: runs but won’t cool →Practice: wrong part, wrong size →A2L start-up guide →
Air handler / fan coil
Covered in the simulatorThe all-electric indoor cabinet: blower, coil, and controls. In multi-family it hides in closets and mechanical rooms; hydronic fan-coil versions swap the coil’s refrigerant for water.
Modeled as the sim’s indoor unit: control power, blower circuits, condensate float, coil airflow. Hydronic (water-coil) versions add loop diagnosis the sim doesn’t model yet.
Start a guided call →Practice: whole system dead →Practice: no air inside →Practice: runs but won’t cool →Practice: acting possessed →Practice: blows fuses →Practice: gauges on →A2L start-up guide →
Tech support
Tech support here is the guided Copilot with your ADP (Advanced Distributor Products) info already loaded — one question at a time, evidence before parts, and everything you enter rides into the service report.
Opens the guided Copilot with ADP (Advanced Distributor Products) already on the equipment card.
Reading ADP (Advanced Distributor Products) model numbers
Lennox writes series-dash-size: 14ACX-036 reads 14 SEER / ACX line / 036 = 3 tons; XC16-048 is the Elite 4-ton. Allied Air brands (Armstrong, AirEase, Ducane, Concord) use 4SCU/4SHP-style prefixes with the same trailing size. Furnaces (ML195, EL296V, SLP98V) put AFUE in the name and heating input elsewhere — don’t read furnace digits as tonnage. Magic-Pak all-in-ones put cooling capacity in the TRAILING block (…-241/-301/-361 = 2 / 2.5 / 3 tons); the digit right after MHP/MGE is the series generation and the middle token is the efficiency class — neither is a size.
14ACX-036-230— Lennox Merit split A/C, 14 SEER, 3 tons (036).4SCU16LS148P— Allied Air split A/C, 16 SEER, 4 tons (48).
Thirty years of these units
1990s–2000s: 10ACB/12HPB R-22 era. 2010s: 13ACX/14ACX/XC lines on R-410A. 2020s: EL/SL variable-capacity and A2L transitions.
Lennox residential packages (LRP14/LRP16) put tonnage right in the model: LRP14AC36 = 3 tons.
Dating a unit from the serial
Lennox serials lead with plant digits then two year digits (e.g., 5807C… → 2007). Allied brands differ — check the family table. Serial 5807C12345 → 2007 build.
Common rule — spot-check against the manufacturer’s table
Need the wiring? The practice board’s ladder diagram is live and interactive — the same circuit these units share, with a meter on it. Open the board →