I. Series Overview
The Small Air Conditioning Series is Copeland's ZR series compact
scroll compressor product line designed for 2.3 HP to 3.9 HP applications. It covers five model grades: ZR28, ZR34, ZR36, ZR42, and ZR47. It offers both single-phase 220-240V and three-phase 380-420V power options, making it suitable for residential central air conditioning, small commercial air conditioning, precision air conditioning, and process cooling applications.
| Feature Dimension | Description |
| Technology Type | Hermetic Compliant Scroll |
| Power Range | 2.33 HP – 3.9 HP |
| Cooling Capacity Range | 6,900 W – 11,550 W |
| Refrigerant | R22 |
| Power Supply | Single-phase 220-240V/50Hz or Three-phase 380-420V/50Hz |
| Core Positioning | Compact & Lightweight, High Cost-Performance, Ultra-Quiet |
II. Full Series Parameter Comparison Table
| Model | Power Supply | Nominal HP | Cooling Capacity (W) | Input Power (W) | Current (A) | COP | Displacement (m³/h) | Oil Charge (L) | Net Weight (kg) | LRA (A) | Noise (dBA) |
| ZR28K3-PFJ | Single-phase | 2.33 | 6,900 | 2,520 | 12.9 | — | 6.83 | — | 26–27.2 | — | — |
| ZR28K3E-TFD-522 | Three-phase | 2.33 | 6,900 | 2,150 | — | — | 6.83 | 1.01 | 25.4 | — | — |
| ZR34K3-PFJ | Single-phase | 2.83 | 8,200 | 2,540 | 13.6 | — | 8.02 | — | 29 | — | — |
| ZR34K3-TFD-522 | Three-phase | 2.83 | 8,200 | 2,480 | 4.7 | 3.31 | 8.02 | 1.04 | 36.3 | 40.0 | 68.0 |
| ZR34KH-PFJ | Single-phase | 2.83 | 8,200 | 2,520 | 13.6 | 3.25 | 8.02 | 1.04 | 36.3 | 100.0 | 66.0 |
| ZR36K3-PFJ | Single-phase | 3.0 | 8,900 | 2,700 | 16.4 | — | 8.61 | — | 29 | — | — |
| ZR36K3-TFD-230 | Three-phase | 3.0 | 8,790 | 2,680 | — | — | 8.61 | — | 29 | — | — |
| ZR36KH-PFJ | Single-phase | 3.0 | 8,900 | 2,680 | — | — | 8.61 | — | 29 | — | — |
| ZR36KH-TFD-522 | Three-phase | 3.0 | 8,900 | 2,680 | — | — | 8.61 | — | 28 | — | — |
| ZR42K3-PFJ-522 | Single-phase | 3.5 | 10,100–10,250 | 3,120–3,150 | 15.2–17.1 | 3.25 | 9.94 | 1.24 | 29.9–30.4 | 97.0 | 68.0 |
| ZR42K3-TFD | Three-phase | 3.5 | 10,100–10,250 | 3,100 | 5.5 | 3.31 | 9.94 | 1.24 | 28.2–28.6 | 46.0 | 68.0 |
| ZR47K3-PFJ | Single-phase | 3.9 | 11,500–11,550 | 3,460–3,530 | 16.8–19.3 | 3.34 | 11.16 | 1.24 | 30.4–31.3 | 114.0 | 68.0 |
III. Detailed Model Overview
ZR28K3-PFJ (2.33 HP, Single-Phase) – Compact Entry-Level Choice
The ZR28K3-PFJ is the entry-level model of the small air conditioning series, with a cooling capacity of 6,900 W and a net weight of only 26 kg. At 383 mm in height, it is one of the most compact models in the entire ZR series. Designed with a compact and lightweight core concept, Copeland Scroll™ axial and radial compliance technology ensures excellent reliability and high efficiency. Its few moving parts, low vibration, and low noise make it perform exceptionally well in residential and light commercial settings. For 2.3 HP class applications such as residential split ACs, small unitary systems, and commercial display cases, the ZR28K3-PFJ provides an economical and efficient cooling power solution.
ZR34K3-TFD-522 (2.83 HP, Three-Phase) – High-Efficiency Three-Phase Benchmark
The ZR34K3-TFD-522 delivers a cooling capacity of 8,200 W with an input power of 2,480 W and a remarkably low current draw of only 4.7 A, achieving a leading COP of 3.31 within the small air conditioning group. It features a displacement of 8.02 m³/h, 1.04 L oil charge, 40.0 A locked rotor current (LRA), and 68 dBA noise level. A COP of 3.31 means it produces 3.31 kW of cooling for every 1 kW of electricity consumed. For medium-sized commercial AC, rooftop units, and unitary systems requiring three-phase power, the ZR34K3-TFD-522 stands out as the preferred choice for projects pursuing operational economy due to its high energy efficiency ratio and smooth three-phase operation.
ZR34KH-PFJ (2.83 HP, Single-Phase, High-Efficiency Version) – Ultra-Quiet Choice for Precision Air Conditioning
The ZR34KH-PFJ is a high-efficiency version of the ZR34K3 (indicated by the "H" suffix). It offers a cooling capacity of 8,200 W, input power of 2,520 W, COP of 3.25, and an ultra-low noise level of 66 dBA—the quietest in the small air conditioning series. This 66 dBA noise rating makes it particularly suitable for noise-sensitive environments such as hotels, hospitals, office buildings, and precision air conditioning rooms. For applications like precision AC and process cooling with strict environmental requirements, the ZR34KH-PFJ provides a more comfortable solution with lower noise and optimized energy efficiency.
ZR36K3-PFJ / ZR36K3-TFD-230 / ZR36KH-PFJ / ZR36KH-TFD-522 (3 HP) – The Standard 3 HP "Gold Power" Family
The ZR36K3 series is the standard 3 HP family, covering four configurations: single/three-phase and standard/high-efficiency. Core parameters are unified: cooling capacity 8,790–8,900 W, input power 2,680–2,700 W, displacement 8.61 m³/h, net weight 28–29 kg. 3 HP is one of the most mainstream power specifications in the commercial AC field, and this series has become one of the most in-demand model families in the market thanks to this "golden power" positioning. For 3 HP class applications such as commercial split ACs, rooftop units, unitary systems, and small chillers, this series is the preferred power source for OEMs and service contractors alike, thanks to its broad market compatibility and genuine Copeland quality.
ZR42K3-PFJ-522 / ZR42K3-TFD (3.5 HP) – Mainstay for Medium Air Conditioning
The ZR42K3 series is the 3.5 HP workhorse of the small air conditioning group. The ZR42K3-PFJ-522 (single-phase) delivers a cooling capacity of 10,100–10,250 W with a COP of 3.25; the ZR42K3-TFD (three-phase) offers the same capacity with a COP of 3.31 and a low current draw of only 5.5 A. For medium-sized AC systems—such as residential central AC, commercial unitary systems, and small chillers—powered by either single or three-phase, the ZR42K3 series provides ample cooling reserve and good operational economy with 10.25 kW capacity and 3.25–3.31 COP. This series supports dual and triple compressor parallel operation for flexible system capacity expansion.
ZR47K3-PFJ (3.9 HP, Single-Phase) – The Single-Phase Efficiency Flagship
The ZR47K3-PFJ is the most powerful single-phase model in the small air conditioning series, with a cooling capacity of 11,500–11,550 W and a best-in-class COP of 3.34. It features a displacement of 11.16 m³/h, 1.24 L oil charge, 114.0 A LRA, and 68 dBA noise. For applications requiring high cooling capacity but limited to single-phase power—such as large residential central AC, commercial unitary systems, and precision AC—the ZR47K3-PFJ achieves a perfect balance of performance and efficiency with its 11.55 kW robust cooling and high 3.34 COP.
IV. Application Scenario Quick Selection Guide
| Application Scenario | Recommended Model | HP | Power Supply | Key Advantage |
| Small split AC / Display cases | ZR28K3-PFJ | 2.33 HP | Single-phase | 26kg lightweight, compact installation |
| Small commercial central AC (3-phase) | ZR28K3E-TFD-522 | 2.33 HP | Three-phase | POE ester oil, smooth 3-phase operation |
| Medium commercial AC (High-efficiency 3-phase) | ZR34K3-TFD-522 | 2.83 HP | Three-phase | COP 3.31, current only 4.7A |
| Precision AC / Low-noise venues | ZR34KH-PFJ | 2.83 HP | Single-phase | Ultra-quiet at 66 dBA |
| Standard 3 HP commercial AC / Rooftop units | ZR36K3-PFJ / ZR36K3-TFD-230 | 3 HP | Single/3-phase | 8.79kW, highest market demand |
| 3 HP High-efficiency precision AC | ZR36KH-PFJ / ZR36KH-TFD-522 | 3 HP | Single/3-phase | Optimized high efficiency |
| Medium AC / Chillers (Single-phase) | ZR42K3-PFJ-522 | 3.5 HP | Single-phase | 10.25kW, COP 3.25 |
| Medium AC / Chillers (Three-phase) | ZR42K3-TFD | 3.5 HP | Three-phase | COP 3.31, current only 5.5A |
| Large single-phase AC / Precision cooling | ZR47K3-PFJ | 3.9 HP | Single-phase | 11.55kW, highest COP at 3.34 |
Selection Tip: Choose "PFJ" for single-phase power and "TFD" for three-phase. For the highest COP, choose ZR47K3-PFJ (3.34) or ZR34K3-TFD-522 (3.31). For the lowest noise, choose ZR34KH-PFJ (66 dBA).
V. Frequently Asked Questions (FAQ)
Q1: What is the difference between ZR28K3-PFJ and ZR28K3E-TFD-522?
A: Both share the same nominal HP (2.33 HP) and cooling capacity (6,900 W). The main differences are: ZR28K3-PFJ uses single-phase 220-240V power with an input power of 2,520 W; ZR28K3E-TFD-522 uses three-phase 380-420V power with an input power of 2,150 W, 1.01 L oil charge, and a net weight of 25.4 kg. The "E" designation indicates the use of POE ester oil.
Q2: What is the difference between ZR34K3-TFD-522 and ZR34KH-PFJ?
A: Both share the same nominal HP (2.83 HP) and cooling capacity (8,200 W). The ZR34K3-TFD-522 is three-phase 380-420V with a COP of 3.31 and noise at 68 dBA; the ZR34KH-PFJ is single-phase 220-240V with a COP of 3.25 but lower noise at 66 dBA. The "H" suffix represents a high-efficiency optimized version, suitable for noise-sensitive environments.
Q3: Do the Small Air Conditioning Series compressors support parallel operation?
A: Yes. Copeland ZR series scroll compressors support dual and triple parallel configurations, allowing application in higher capacity systems. Multi-compressor combinations provide excellent comfort while reducing operating costs for users through higher seasonal energy efficiency ratios.
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