Indian Hitachi: middle digits encode star+capacity; 18-group = 1.5T, 12-group = 1T, 22/24-group = 2T. Paste your model number for an instant decode.
Always confirm against the data plate's rated capacity line — model ranges occasionally reuse digits for non-capacity codes, and the plate is authoritative.
| Capacity code | BTU/hr | Tons |
|---|---|---|
| 09 | 9,000 | 0.75 |
| 12 | 12,000 | 1.0 |
| 18 | 18,000 | 1.5 |
| 24 | 24,000 | 2.0 |
| 30 | 30,000 | 2.5 |
| 36 | 36,000 | 3.0 |
| 42 | 42,000 | 3.5 |
| 48 | 48,000 | 4.0 |
| 60 | 60,000 | 5.0 |
Amana American Standard Blue Star Bryant Carrier Daikin Goodman Heil Lennox LG Lloyd O General Panasonic Payne Rheem Ruud Samsung Trane Voltas Whirlpool York
On the data plate — a metal or foil sticker on the side or back of the outdoor unit (or behind the front panel on indoor split units). Use the model number, not the serial number, which encodes the manufacture date rather than capacity.
Indian Hitachi: middle digits encode star+capacity; 18-group = 1.5T, 12-group = 1T, 22/24-group = 2T. Divide the BTU code by 12 to get tons.
Paste the model number from the outdoor unit's data plate into the decoder above — it applies Hitachi's nomenclature automatically. Example: RAS.G318PCAISF = 1.5 tons.
Hitachi (JCI) runs a standard shorthand track (BTU code ÷ 12) and a metric kW track for premium/VRF lines.
Modern models split the family from the type with a hyphen, e.g. RAK-DJ18PCAT (families RAK/RAS = indoor wall units, RAC = outdoor condenser). The middle block carries the size, so RAK-DJ18 → 18 → 1.5 tons; a metric string like RAS-Z35HE reads 35 as a 3.5 kW / 1.0-ton class.
Traditional window lines use continuous strings such as RAW318HFDU, where RAW marks a room window unit and the decoder isolates the two-digit capacity (18 → 1.5 tons).
The decoder above applies this nomenclature automatically. Capacity codes are nominal — always confirm against the rated-capacity line on the unit’s data plate.
Capacity decoding on this page follows Hitachi’s published model-number nomenclature. To confirm a unit’s actual rated capacity and efficiency, cross-check the authoritative references below.
Tonnage is derived from nominal cooling capacity: 1 ton = 12,000 BTU/hr ≈ 3.5 kW. Indian shorthand codes (e.g. 12, 18, 24) and metric kW classes both map to these nominal tonnages.
Model-number conventions and standards evolve, and manufacturers occasionally reuse digits for non-capacity codes — the rated-capacity line on the unit’s data plate is always authoritative. Figures here are for identification and planning, not a substitute for a professional load calculation.
Different brand? Back to the full 22-brand decoder. Sizing a replacement? Check what your space really needs with the AC tonnage calculator first — the old unit may have been mis-sized.