This document covers the specifications for the outdoor unit model AOTH45KRTA.

Electrical Data
Power supply is 380–415V 3N ~ 50Hz, with an available voltage range of 342–457V. Starting current is 6.4 A.

Fan, Airflow, and Motor Output
Airflow rate is 1,236 L/s (4,450 m³/h) in cooling and 1,236 L/s (4,450 m³/h) in heating. Fan type is Propeller fan × 1 with motor output 120 W.

Sound Levels
Sound pressure level is 55 dB(A) (Cooling) and 57 dB(A) (Heating). Sound power level is 71 dB(A).

Heat Exchanger
Heat exchanger dimensions (H × W × D) are Main 1: 986 × 905 × 18.19 mm, Main 2: 986 × 905 × 18.19 mm, and Sub 1: 966 × 543 × 18.19 mm. Fin pitch is Main 1: 1.45, Main 2: 1.45, Sub 1: 1.45. Rows × stages are Main 1: 1 × 46, Main 2: 1 × 46, Sub 1: 1 × 46. Pipe type is Copper tube. Fin type is Aluminum with Blue fin surface treatment.

Compressor
Compressor type is DC twin rotary, with motor output 2,180 W.

Refrigerant and Oil
Refrigerant type is R32, charge 2,700 g. Refrigerant oil type is RmM68AF, amount 800 cm³.

Enclosure, Dimensions, and Weight
Enclosure material is Steel sheet, colour Beige (approximate colour Munsell 10YR 7.5/1.0).
Net dimensions are 998 × 940 × 320 mm, and gross dimensions are 1,176 × 1,027 × 445 mm.
Net weight is 62 kg, and gross weight is 77 kg.

Connection Pipe and Piping Limits
Liquid pipe size is Ø9.52 mm (3/8 in.) and gas pipe size is Ø15.88 mm (5/8 in.), connection method Flare. Pre-charge length is 30 m, maximum length is 50 m, and maximum height difference is 30 m.

Operating Range and Protection Rating
Operating range is -10 to 50°C (Cooling) and -15 to 24°C (Heating).
Drain hose material is LDPE, tip diameter Ø13.0 (I.D.) / Ø16.0 to Ø16.7 (O.D.) mm. International protection rating is IPX4.

AOTH45KRTA: Operates on 380–415V 3N, 50Hz, with maximum operating current 14.0A and starting current 6.4A, using a 16A circuit breaker, 2.5 mm² power cable, 1.5 mm² connection cable, and maximum connection wiring length 51 m.

AOTH45KRTA — Safety Devices

  • Circuit protection (Current fuse – Main PCB): 250 V, 30 A × 2; and 250 V, 10 A × 2.

  • Fan motor protection (Thermal protection program): Activates at 150 ±15°C (fan motor stop); resets at 120 ±15°C (fan motor restart).

  • Compressor protection (Thermal protection program – Discharge temp.): Activates at 110°C (compressor stop); resets after 7 minutes (compressor restart).

  • Compressor protection (Thermal protection program – Compressor temp.): Activates at 108°C (compressor stop); resets at 80°C or less (compressor restart).

  • Compressor protection (Thermal protection program – Outdoor temp.): Activates at −20°C (compressor stop); resets at −15°C (compressor restart).