Panasonic 5KD240ZCA21 DC Inverter Rotary Compressor – 2 HP / 24,000 BTU, R410A

Panasonic 5KD240ZCA21 is a DC inverter twin (dual-piston) rotary compressor operating with R410A refrigerant. With a displacement of 24.0 cm³/rev, it is in the 2 HP / ≈24,000 BTU class; it is used in split air conditioner outdoor units, VRF indoor modules, heat pumps and inverter-controlled commercial air conditioning units.

Dual-Piston (Twin) Rotary: A Design That Halves Vibration

• Two-piston compression: The pistons run 180° out of phase; vibration and torque fluctuation are noticeably lower than in single-piston rotaries. It runs smoothly even at low speed — critical in inverter compressors.
• DC inverter driven: Speed is continuously adjusted to the load; on-off cycling is eliminated, room temperature stays constant and there is no starting current load.
• Class efficiency: In Panasonic's 24 cm³ R410A inverter rotary class, under ARI conditions 7,280 W (≈24,840 BTU/h) capacity, 2,400 W input, COP 3.03 / EER 10.35.
• With accumulator: Holds liquid refrigerant in the suction line; protects the compressor against liquid slugging.
• Compact and light: Fits narrow outdoor unit chassis and makes installation easy.

Technical Specifications and Installation Notes

• Model: Panasonic 5KD240ZCA21  |  Supply Code: 10.183.0057
• Type: Hermetic twin rotary (2 pistons), DC inverter driven
• Refrigerant: R410A  |  Application: High back pressure (HBP) — air conditioning
• Power Class: 2 HP  |  Capacity: ≈24,000 BTU/h (7,280 W, ARI)
• Displacement: 24.0 cm³/rev  |  COP: 3.03  |  EER: 10.35
• Motor: 3-phase DC brushless — supplied at variable frequency from the drive
• Body Dimensions: Body diameter Ø132.6 mm  |  Body height 295 mm  |  Total with accumulator 346 mm
• Accumulator: Ø75 mm, 113.5 mm from the body center  |  Suction Port: Inside diameter 8.06 mm  |  Accumulator Inlet: Inside diameter 16.0 mm
• Mounting: K-type 3-foot base, 120° spacing, 3 × Ø19.1 mm holes — dimensioned technical drawing in the 2nd image

• 🔧 It is an inverter compressor and is not connected directly to the mains. When replacing, also check the drive board; a faulty drive will burn out the new compressor too. Measure the winding resistance between the three terminals for balance.
• Do not remove the accumulator: It is the only component that protects the compressor against liquid return; it must be fitted together when replacing.
• R410A is a high-pressure refrigerant: Make sure the lines and fittings are rated for R410A pressure; always charge in the liquid phase.
• Ester oil absorbs moisture: Open the plugs just before installation and dry the system with a deep vacuum (≤500 micron).
• Upright mounting is required: Rotary compressors must not be run tilted; fix it upright on the chassis with vibration mounts.