GENERAL AIRSTAGE | Ducted Inverter Heat Pump
ARTH72KHTA / AOTH72KRTA
Design & Technical Specifications
20.0 kW cooling / 22.4 kW heating • R32 • 3-phase • High static ducted system
System combination
Indoor unit: ARTH72KHTA
Outdoor unit: AOTH72KRTA
Type: Inverter heat pump, ducted indoor unit
Indoor unit: ARTH72KHTA
Outdoor unit: AOTH72KRTA
Type: Inverter heat pump, ducted indoor unit
1. Key system specifications
| Specification | Cooling | Heating |
|---|---|---|
| Rated capacity | 20.0 kW (68,200 Btu/h) | 22.4 kW (76,400 Btu/h) |
| Capacity range | 6.0–22.4 kW | 6.0–25.0 kW |
| Rated input power | 6.16 kW | 5.82 kW |
| Maximum input power | 7.26 kW | 6.63 kW |
| Rated current | 9.9 A | 9.5 A |
| Maximum operating current | 18 A | 18 A |
| Efficiency | EER 3.25 kW/kW | COP 3.85 kW/kW |
| Sensible capacity | 15.17 kW | — |
| Moisture removal | 5.3 L/h | — |
2. Electrical data
| Item | Specification |
|---|---|
| Power supply intake | Outdoor unit |
| System power supply | 380–415 V 3N~, 50 Hz |
| Available voltage range | 342–457 V 3N |
| Indoor supply from outdoor | 220–240 V |
| Starting current | 9.9 A |
| Circuit breaker current | 20 A |
| Power cable | 2.5 mm² |
| Connection cable | 1.5 mm² |
| Limited wiring length | 76 m |
Electrical selection note
The technical manual lists sample cable and circuit-breaker sizes. Final cable sizing, protection and installation must comply with the applicable local electrical regulations and voltage-drop requirements.
The technical manual lists sample cable and circuit-breaker sizes. Final cable sizing, protection and installation must comply with the applicable local electrical regulations and voltage-drop requirements.
3. Indoor unit — ARTH72KHTA
| Item | Specification |
|---|---|
| Fan type | Sirocco fan × 2 |
| Fan motor output | 750 W |
| External static pressure range | 60–200 Pa |
| Standard static pressure | 72 Pa |
| Dimensions (H × W × D) | 360 × 1,400 × 850 mm |
| Gross dimensions | 460 × 1,640 × 1,030 mm |
| Net weight | 69 kg |
| Gross weight | 80 kg |
| Liquid pipe | Ø12.7 mm (1/2 in) |
| Gas pipe | Ø19.05 mm (3/4 in) |
| Indoor pipe connection method | Brazing |
| Remote controller | Wired standard; wired and wireless options available |
Indoor airflow
| Fan speed | L/s | m³/h | CFM |
|---|---|---|---|
| High | 1,194 | 4,300 | 2,531 |
| Medium | 1,083 | 3,900 | 2,296 |
| Low | 958 | 3,450 | 2,031 |
| Quiet | 833 | 3,000 | 1,766 |
Indoor sound pressure
| High | Medium | Low | Quiet |
|---|---|---|---|
| 46 dB(A) | 43 dB(A) | 41 dB(A) | 39 dB(A) |
4. Outdoor unit — AOTH72KRTA
| Item | Specification |
|---|---|
| Refrigerant | R32 |
| Factory refrigerant charge | 4,500 g |
| Compressor | DC twin rotary, 2,550 W motor output |
| Outdoor fan | Propeller fan × 2, 120 W motor output |
| Outdoor airflow | 2,583 L/s (9,300 m³/h) |
| Sound pressure | 59 dB(A) cooling / 61 dB(A) heating |
| Sound power | 75 dB(A) cooling |
| Dimensions (H × W × D) | 1,418 × 970 × 370 mm |
| Gross dimensions | 1,589 × 1,057 × 495 mm |
| Net weight | 107 kg |
| Gross weight | 118 kg |
| International protection rating | IPX4 |
5. Refrigerant piping and charge
| Item | Specification |
|---|---|
| Liquid pipe | Ø12.70 mm (1/2 in) |
| Gas pipe | Ø19.05 mm (3/4 in) |
| Indoor connection | Brazing |
| Outdoor connection | Flare |
| Factory pre-charge length | 30 m |
| Maximum pipe length | 75 m |
| Maximum height difference | 30 m |
| Additional refrigerant above 30 m | 60 g/m |
Additional refrigerant charge guide
| Total pipe length | 30 m or less | 40 m | 50 m | 60 m | 75 m |
|---|---|---|---|---|---|
| Additional charge | 0 g | 600 g | 1,200 g | 1,800 g | 2,700 g |
6. Operating ranges
| Location / condition | Cooling | Heating |
|---|---|---|
| Indoor unit return-air range | 18–32°C, 80% RH or less | 16–30°C |
| Outdoor unit suction temperature range | -15 to 50°C | -20 to 24°C |
7. Seasonal efficiency
| Metric | Hot climate | Average climate | Cool climate |
|---|---|---|---|
| TCSPF | 4.676 | 4.800 | 5.141 |
| HSPF | 4.654 | 4.275 | 3.743 |
8. Compatible controls and options
The technical manual lists the following controller and interface options for the ARTH65/72/90KHTA platform:
- UTY-RNRT – wired touch-panel remote controller, non-polar 2-wire.
- UTY-RNRYT – wired touch-panel remote controller, non-polar 2-wire.
- UTY-RVNYN – wired remote controller, polar 3-wire.
- UTY-RSRYT / UTY-RHRYT – simple remote controllers, non-polar 2-wire.
- UTY-RSNYN – simple remote controller, polar 3-wire.
- UTY-LBTYM – IR receiver kit with wireless remote controller.
- UTY-XSZXT – remote sensor unit.
- UTZ-PX1NAB – optional drain pump unit.
- UTY-XCSX – external input/output PCB.
- UTY-VMSX – Modbus converter.
- UTY-VKSX – KNX converter.
- UTY-VTGX – network converter.
9. Important technical notes
- Published performance is based on 230 V test conditions, 7.5 m pipe length and 0 m height difference.
- Rated cooling conditions: indoor 27°C DB / 19°C WB and outdoor 35°C DB / 24°C WB.
- Rated heating conditions: indoor 20°C DB / 15°C WB and outdoor 7°C DB / 6°C WB.
- The ARTH72KHTA standard static pressure is 72 Pa; the selectable static pressure range is 60–200 Pa.
- Protective functions may operate when the system is used outside the specified operating range.
- Sound pressure values are laboratory measurements. Actual installed sound levels can be higher depending on the site, ductwork and surrounding environment.
Document reference
Design & Technical Manual DR_AR110ES_01, dated 13 August 2025, covering ARTH65KHTA / ARTH72KHTA / ARTH90KHTA and matching AOTH65/72/90 outdoor units.
Design & Technical Manual DR_AR110ES_01, dated 13 August 2025, covering ARTH65KHTA / ARTH72KHTA / ARTH90KHTA and matching AOTH65/72/90 outdoor units.