The Sendo SFM-21OU2-AU2 outdoor unit can be connected to up to 3 indoor units and operates with inverter technology and R32 refrigerant. It is compatible with wall-mounted units, cassette units, duct units, and floor-ceiling units. It provides both cooling and heating, with an operating ambient temperature range of -10 to 52 °C in cooling mode and -15 to 24 °C in heating mode.

• Type: Outdoor unit for multi-split air conditioners
• Colour: White
• Number of indoor units: Up to 3
• Cooling capacity: 21,154 Btu/h (7,506–22,895 Btu/h)
• Heating capacity: 22,519 Btu/h (8,155–24,771 Btu/h)
• Power supply: 220–240 V, 50 Hz, single-phase
• Rated cooling/heating current: 8.3 A / 7.8 A
• Cooling energy rating: A++
• Heating energy rating: A+
• SEER/SCOP: 6.57 / 4.38 W/W
• EER/COP: 3.23 / 3.71 W/W
• Airflow: 3,100 m³/h
• Noise level: 65 dB(A)
• Dimensions: 83.4 × 32.8 × 65.5 cm
• Refrigerant: R32
• Liquid piping: 3 × 6.35 mm (1/4 in)
• Gas piping: 3 × 9.52 mm (3/8 in)
• Maximum piping length: 60 m
• Maximum height difference: 15 m
• Ambient temperature range in cooling mode: -10 to 52 °C
• Ambient temperature range in heating mode: -15 to 24 °C