This document covers the specifications for the indoor model ARTH18KMTAP and its corresponding outdoor unit AOTH18KBTA (inverter heat pump system). The system operates on a 220–240V ~ 50Hz supply (available voltage range 198–264V), with the indoor unit power supplied from the outdoor unit.
Cooling performance for ARTH18KMTAP is rated at 5.0 kW (17,100 Btu/h), with a capacity range of 0.9–6.4 kW (3,100–21,800 Btu/h). Rated cooling input power is 1.37 kW (maximum 1.95 kW) and rated cooling current is 5.9 A, delivering an EER of 3.65 kW/kW. Seasonal cooling performance (commercial method) is TCSPF 5.38 (hot climate), 5.40 (average climate), and 5.87 (cool climate), with moisture removal of 1.3 L/h (2.3 pints/h).
Heating performance for ARTH18KMTAP is rated at 6.0 kW (20,500 Btu/h), with a capacity range of 0.9–7.8 kW (3,100–26,600 Btu/h). Rated heating input power is 1.58 kW (maximum 2.39 kW) and rated heating current is 6.8 A, delivering a COP of 3.80 kW/kW. Seasonal heating performance (commercial method) is HSPF 3.76 (hot climate), 4.19 (average climate), and 3.82 (cool climate).
Fan, airflow, static pressure and noise are based on a sirocco fan ×2 with 197 W motor output and static pressure range 50–150 Pa. Indoor fan input power is 77 W (High), 45 W (Med), 33 W (Low), and 24 W (Quiet), with airflow (cooling/heating) of 1,080 / 860 / 760 / 650 m³/h (High/Med/Low/Quiet). Sound pressure level (cooling/heating) is 33 / 28 / 25 / 23 dB(A) (High/Med/Low/Quiet), and sound power level is 55 dB(A).
Physical, piping and operating limits include indoor unit dimensions 240 × 1,000 × 700 mm (net) and 334 × 1,225 × 883 mm (gross), with weight 32 kg (net) and 37 kg (gross). Connection piping is Ø6.35 mm (1/4”) liquid and Ø12.70 mm (1/2”) gas, flare type. Drain components are PVC, with drain hose tip diameter Ø25 (I.D.) / Ø32 (O.D.). Operating range is 18–32°C cooling (80%RH or less) and 16–30°C heating, the controller is wired (option: simple remote controller / IR receiver unit), and the indoor IP rating is IPX0.
Outdoor unit (AOTH18KBTA) key data includes starting current 7.3 A, airflow 2,020 m³/h (cooling) and 1,830 m³/h (heating) with a propeller fan ×1 and 49 W motor output. Outdoor sound pressure is 48 dB(A) cooling and 49 dB(A) heating, with sound power 66 dB(A). The heat exchanger is Main 1: 588 × 851 × 18.19 mm and Main 2: 588 × 851 × 18.19 mm, with blue fin surface treatment. The compressor is DC twin rotary (motor output 900 W) using R32 refrigerant with 1,020 g charge and refrigerant oil FW68B (350 cm³). Outdoor dimensions are 632 × 700 × 300 mm (net) and 692 × 940 × 375 mm (gross), weight 38 kg (net) and 41 kg (gross), piping is Ø6.35 / Ø12.70 flare, with 20 m pre-charge length, 30 m max length, and 20 m max height difference. Outdoor operating range is −10 to 50°C cooling and −15 to 24°C heating, drain hose material is PP with tip diameter Ø13.0 (I.D.) / Ø16.0–Ø16.8 (O.D.), and IP rating is IPX4.
Electrical characteristics (AOTH18KBTA) specify 220–240V, 50Hz, max operating current 12.7 A, starting current 7.3 A, 16 A circuit breaker, 1.5 mm² power cable, 1.5 mm² connection cable, and 31 m maximum connection wiring length.
Safety devices (Indoor – ARTH18KMTAP) include a PCB current fuse 250V, 5A, and fan motor thermal protection that activates at 115 ±15°C (fan stop) and resets at 70°C (fan restart). Safety devices (Outdoor – AOTH18KBTA) include main PCB fusing 250V 25A and 250V 5A, fan motor protection that activates at 125 ±10°C (fan stop) and resets at 120 ±10°C (fan restart), discharge temperature protection that activates at 110°C (compressor stop) and resets after 7 minutes (compressor restart), and outdoor temperature protection (COOL/DRY only) that activates at −20°C (stop) and resets at −15°C (restart); compressor temperature protection is not specified for this model in the table.