I. Positioning
The DH/DHV Series is Hitachi's AC inverter scroll compressor product line optimized for R22 refrigerant, covering three capacity grades: 303DHV, 401DHV, and 401DHVM. With a mid-range power coverage of 4–6 HP and a wide frequency modulation range of 30–90 Hz (up to 150 Hz on select models) as its core features, this series is a classic power choice for VRF (Variable Refrigerant Flow) air conditioning systems and commercial inverter air conditioners.
| Feature Dimension | Description |
| Technology Type | AC Inverter Scroll |
| Power Range | 4 HP – 6 HP |
| Refrigerant | R22 |
| Frequency Range | 30–90 Hz / 20–150 Hz (model dependent) |
| Core Positioning | Classic inverter for VRF & commercial A/C, R22 optimized |
II. Full Series Parameter Comparison Table
| No. | Model | Nominal HP | Displacement (cm³/rev) | Cooling Capacity (kW) | Input Power (kW) | COP | Frequency Range (Hz) | Noise (dB) |
| 1 | 303DHV-47B2Y | 4 | 47 | 10.7 | 3.37 | 3.2 | 30–90 | 60 |
| 2 | 303DHV-47D2Y | 4 | 47 | 10.7 | 3.35 | 3.2 | 30–90 | 60 |
| 3 | 401DHV-64D2Y | 5 | 64 | 18.0 | 5.6 | 3.2 | 20–150 | 66 |
| 4 | 401DHVM-64D1 | 4 | 64 | 16.5–18.0 | 5.25 | 3.14–3.20 | 20–115 | — |
III. Detailed Analysis
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Feature: The DH/DHV Series adopts AC inverter scroll technology, enabling continuous capacity modulation through inverter-driven rotational speed control. The 303DHV series features a displacement of 47 cm³/rev, noise as low as 60 dB, oil charge of 1.5 L, and a weight of 36 kg. The 401DHV-64D2Y delivers a displacement of 64 cm³/rev, cooling capacity of 18.0 kW, frequency range of 20–150 Hz, and weighs approximately 36 kg. The entire series comes standard with a crankcase heater to ensure reliable cold-weather starting.
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Advantage: This series centers on wide-frequency modulation and proven reliability. The 303DHV-47B2Y delivers 10.7 kW of cooling within a 30–90 Hz range at a COP of 3.2, with noise at only 60 dB—standing out for its ultra-quiet performance among 4 HP inverter compressors. The 401DHV-64D2Y's 18.0 kW cooling capacity and ultra-wide 20–150 Hz frequency range enable highly efficient operation across a broad load spectrum. AC inverter technology is mature, reliable, and cost-effective to maintain.
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Benefit: For VRF system manufacturers, the wide-frequency modulation of the DH/DHV Series enables precise matching of building load variations while maintaining high energy efficiency during part-load periods. For the maintenance, repair, and replacement (MRR) market of existing R22 systems, this series provides a plug-and-play replacement solution that eliminates the need to replace system piping and refrigeration oil. For contractors, the 303DHV-47B2Y's ultra-low 60 dB noise and 1.5 L oil charge reduce system design complexity and installation difficulty.
IV. Quick Selection Guide by Application Scenario
| Application Scenario | Recommended Model | HP | Key Advantage |
| 4 HP VRF | 303DHV-47B2Y | 4 | 10.7 kW, COP 3.2, 60 dB quiet |
| 4 HP VRF (R22) | 303DHV-47D2Y | 4 | 10.7 kW, alternative connection config. |
| 5–6 HP VRF | 401DHV-64D2Y | 5 | 18.0 kW, 20–150 Hz wide frequency |
| 4 HP VRF (DC Inverter) | 401DHVM-64D1 | 4 | 16.5–18.0 kW, COP 3.14–3.20 |
Selection Mnemonic: For 4 HP, choose 303DHV-47B2Y/D2Y; for 5–6 HP, choose 401DHV-64D2Y; for DC inverter, choose 401DHVM-64D1.
V. Frequently Asked Questions (FAQ)
Q1: What are the technical specifications of 303DHV-47B2Y?
303DHV-47B2Y is a 4 HP AC inverter scroll compressor with a displacement of 47 cm³/rev, cooling capacity of 10.7 kW, input power of 3.37 kW, COP of 3.2, frequency range of 30–90 Hz, noise level of 60 dB, oil charge of 1.5 L, and weight of 36 kg.
Q2: What are the technical specifications of 401DHV-64D2Y?
401DHV-64D2Y is a 5–6 HP AC inverter scroll compressor with a displacement of 64 cm³/rev, cooling capacity of 18.0 kW, input power of 5.6 kW, COP of 3.2, frequency range of 20–150 Hz, noise level of 66 dB, oil charge of 1.8 L, and weight of approximately 36 kg.
Q3: What is the difference between 401DHVM-64D1 and 401DHV-64D2Y?
401DHVM-64D1 is a DC inverter type with an inverter power supply of 115–380V, frequency range of 20–115 Hz, cooling capacity of 16.5–18.0 kW, and COP of 3.14–3.20. 401DHV-64D2Y is an AC inverter type with a power supply of 380-415V/50Hz and frequency range of 20–150 Hz.
III. Detailed Analysis
V. Frequently Asked Questions (FAQ)
