I. HCP Series (R407C, 7.8–10 HP)
Product Overview
The HCP series is a large-capacity commercial air-conditioning scroll compressor for R407C refrigerant within the Danfoss H series, including three models: HCP094T4, HCP109T4, and HCP120T4. As a zero-ODP alternative to R22, R407C has a slightly higher discharge pressure. The HCP series is engineered to match R407C characteristics in terms of motor insulation, housing pressure resistance, and lubrication system. Covering a displacement of 126–162.4 cm³/rev and a nominal horsepower of 7.8–10 HP, with a cooling capacity of approximately 21.6 kW to 28.2 kW (at 50Hz), this series is suitable for medium-sized chillers, modular air conditioners, and industrial process cooling applications requiring higher single-unit cooling capacity.
Specifications Summary
| Model | Displacement (cm³/rev) | Nominal HP | Cooling Capacity 50Hz (W) | Input Power (kW) | COP | Oil Charge (L) | Net Weight (kg) | MCC (A) | Locked Rotor Current (A) |
| HCP094T4 | 126.02 | 7.8 | 21,590 | 6.63 | 3.26 | 2.66 | ~44 | 21 | 84 |
| HCP109T4 | 148.79 | 9.1 | 26,690 | 7.77 | 3.43 | 2.66 | ~44 | — | 110 |
| HCP120T4 | 162.4 | 10.0 | 28,150 | 8.51 | 3.42 | 2.66 | ~44 | — | 140 |
The HCP094T4 has a net weight of 43.42 kg, a locked rotor current of 84 A, an MCC of 21 A, a 1 1/8" suction pipe, a 7/8" discharge pipe, and a maximum high-side pressure of 31.1 bar.
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Feature. The HCP series adopts an integrally cast housing. All three models share an outer diameter of 184 mm and an oil charge of 2.66 L, with 1 1/8" suction and 7/8" ODF brazed connections. The compressor is equipped with a built-in motor overload protection module.
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Advantage. The three models form a cooling capacity ladder of 21.6 → 26.7 → 28.2 kW within the same housing, eliminating the need for system designers to change mounting bases and piping interfaces for the three ratings of 7.8 HP, 9.1 HP, and 10 HP. The HCP109T4 achieves a COP of 3.43, which is among the highest levels for R407C 9 HP scrolls. The HCP120T4 delivers 28.2 kW with its 10 HP displacement, allowing a single unit to cover the core cooling capacity of medium-sized modular units or small chillers, thereby reducing the number of parallel compressors required.
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Benefit. For commercial air conditioning and chiller projects currently running R407C systems, the HCP series provides a platform-level replacement solution: continuous cooling capacity ratings, unified housing, and matched oil type mean equipment manufacturers do not need to develop a separate installation structure specifically for R407C. For engineering integrators, the 9.1 HP and 10 HP ratings differ by only about 1.5 kW between 26.7–28.2 kW, allowing selection to be closer to the actual load and avoiding being forced to choose an oversized unit due to large rating gaps.
Application Scenarios
II. HRH Series (R410A, 2.4–4.7 HP)
Product Overview
The HRH series is the R410A high-pressure platform in the Danfoss H series, comprising 14 models from HRH029U4 to HRH056U4. Since the operating pressure of R410A is significantly higher than that of R407C and R22, the HRH series is engineered for high-pressure conditions in terms of housing strength, motor insulation, and valve plate design. The series covers a displacement of 27.8–54.1 cm³/rev, a nominal horsepower of 2.4–4.7 HP, and a cooling capacity of approximately 7.1 kW to 13.8 kW (at 50Hz). It is positioned as a model pursuing high volumetric efficiency and a compact structure for residential and light commercial R410A air conditioning systems.
Specifications Summary
| Model | Displacement (cm³/rev) | Nominal HP | Cooling Capacity 50Hz (W) | Input Power (kW) | COP | Oil Charge (L) | Net Weight (kg) |
| HRH029U4 | 27.8 | 2.4 | 7,120 | 2.43 | 2.93 | 1.06 | 31 |
| HRH031U4 | ~29.5 | 2.6 | 7,530 | 2.67 | 2.82 | 1.06 | ~31 |
| HRH032U4 | ~30.2 | 2.7 | 7,670 | 2.75 | 2.79 | 1.06 | ~31 |
| HRH034U4 | ~32.5 | 2.8 | 8,500 | 2.90 | 2.93 | 1.06 | ~31 |
| HRH036U4 | ~34.1 | 3.0 | 8,820 | 3.13 | 2.82 | 1.06 | ~31 |
| HRH038U4 | ~36.0 | 3.2 | 9,250 | 3.35 | 2.76 | 1.06 | ~31 |
| HRH040U4 | ~38.8 | 3.3 | 10,200 | 3.58 | 2.85 | 1.57 | ~37 |
| HRH041U4 | ~39.0 | 3.3 | 10,050 | 3.43 | 2.93 | 1.57 | ~37 |
| HRH044U4 | ~42.2 | 3.7 | 10,830 | 3.92 | 2.76 | 1.57 | ~37 |
| HRH049U4 | ~47.4 | 4.1 | 12,110 | 4.04 | 2.99 | 1.57 | ~37 |
| HRH051U4 | ~49.3 | 4.3 | 12,860 | 4.21 | 3.05 | 1.57 | 37 |
| HRH054U4 | 52.1 | 4.5 | 13,340 | 4.41 | 3.02 | 1.57 | 37 |
| HRH056U4 | 54.1 | 4.7 | 13,830 | 4.58 | 3.02 | 1.57 | 37 |
Note: HRH049U4 has a cooling capacity of 12,110 W, COP of 2.99, and displacement of 47.4 cm³; HRH051U4 has a cooling capacity of 12,860 W, COP of 3.05, and displacement of 49.3 cm³.
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Feature. The HRH series adopts an R410A-specific high-pressure chamber design and a compliant scroll structure, with the housing and motor matched to the high differential pressure conditions of R410A. There is a stratification in housing and oil charge within the series: HRH029–HRH038 share a compact housing of 1.06 L oil charge and approximately 31 kg; HRH040 and above switch to 1.57 L oil charge and a housing of approximately 37 kg. Suction and discharge pipe diameters increase with cooling capacity, with smaller capacities maintaining smaller connection sizes to control piping footprint.
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Advantage. The high-pressure characteristics of R410A enable the HRH series to achieve higher unit volumetric cooling capacity at the same displacement. The HRH029U4 delivers 7.1 kW of cooling with a displacement of only 27.8 cm³, making it suitable for residential and light commercial outdoor units where compressor compartment space is critical. The 14 models form a near-continuous displacement ladder from 2.4 HP to 4.7 HP, with cooling capacity differences between most adjacent models in the 200–800 W range, allowing system designs to match actual loads without significant redundancy. The HRH051U4 achieves a COP of 3.05, demonstrating excellent energy efficiency among 4.3 HP R410A fixed-speed scrolls.
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Benefit. For R410A air conditioning equipment manufacturers, the fine ladder of the HRH series allows a single outdoor unit model to cover multiple ratings from 2.4 HP to 4.7 HP simply by changing the compressor, reducing the need for housing mold changes and piping design modifications. The 31 kg-class housing in the small capacity range (HRH029–038) facilitates layout in compact outdoor units and rooftop units; the 37 kg housing and 1.57 L oil charge in the medium-to-large capacity range (HRH040–056) provide margin for slightly longer piping and larger refrigerant charges. For aftermarket replacement, the clear stratification node (between HRH038/040) helps quickly determine whether the original unit belongs to the compact or standard housing category, reducing the risk of mismatching.
Application Scenarios
III. Selection Boundary of the Two Series
| Selection Criteria | HCP (R407C) | HRH (R410A) |
| Refrigerant | R407C, zero ODP, pressure slightly higher than R22 | R410A, high-pressure platform, high volumetric cooling capacity |
| Cooling Capacity Positioning | Single unit 21–28 kW, 7.8–10 HP | Single unit 7–14 kW, 2.4–4.7 HP |
| Typical Systems | Medium chillers, modular units, process cooling | Residential/Light commercial splits, rooftop units, small heat pumps |
| Housing & Oil Charge | Unified housing, 2.66 L oil charge | Two tiers: 31 kg/1.06 L and 37 kg/1.57 L |
| Selection Logic | Use large cooling capacity single unit to replace small unit parallel configuration | Use fine displacement ladder to accurately match compact systems |
Cross-refrigerant replacement is strictly prohibited even if cooling capacities appear similar. The discharge pressure, lubricating oil compatibility, and system component pressure ratings of R407C and R410A are different; switching refrigerant platforms requires a comprehensive evaluation of the system design.
Frequently Asked Questions (FAQ)
Q1: What is the fundamental difference between HCP and HRH?
HCP is an R407C platform, positioned for 7.8–10 HP large-capacity commercial air conditioning; HRH is an R410A platform, positioned for 2.4–4.7 HP compact high-pressure air conditioning. They differ in refrigerant, housing pressure resistance, and oil type, and are not a simple replacement relationship within the same cooling capacity range.
Q2: What are the locked rotor current and MCC of HCP094T4?
The HCP094T4 has a locked rotor current of 84 A, a maximum continuous current (MCC) of 21 A, a running load current (RLA) of 13.5 A, and a maximum high-side working pressure of 31.1 bar.
Q3: Why does the HRH series switch housing and oil charge at HRH040?
HRH029–038 feature a 31 kg-class compact housing with 1.06 L oil, targeting 2.4–3.2 HP compact outdoor units; HRH040 and above switch to a 37 kg housing with 1.57 L oil, providing larger internal volume and lubricating oil margin for 3.3–4.7 HP, slightly larger cooling capacities, and slightly longer piping. This is an engineering demarcation of housing tiers, not merely a displacement increase.
Q5: Can these two series use R22?
No. The HCP is charged with PVE oil for R407C, and the HRH is matched with R410A; the lubricating oils and system pressure ratings of both do not support direct charging of R22. R22 systems should use the Danfoss HLM/HCM series (alkylbenzene oil).
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