I. Series Overview
The AJ / CAE series consists of hermetically sealed reciprocating commercial refrigeration compressors from the French brand Tecumseh / L'Unité Hermétique. They are widely used in air conditioning, heat pumps, and medium-to-high temperature commercial refrigeration applications. This series covers a power range from 3/4 HP to 1-5/8 HP, offering three major refrigerant versions: R22 (suffix E/T), R404A/R507 (suffix Z), and R134a (suffix F). They serve as a classic power source for air conditioning and commercial refrigeration equipment.
| Feature Dimension | Description |
| Technology Type | Hermetically sealed reciprocating |
| Power Range | 3/4 HP – 1-5/8 HP |
| Displacement Range | 18.6 cc – 34.45 cc |
| Refrigerant | R22 (E/T) / R404A/R507 (Z) / R134a (F) |
| Power Supply | Single-phase 220-240V/50Hz (AJ) or Three-phase 400V/50Hz (TAJ) |
| Application Temp. | High/Medium Back Pressure (HBP/MBP): -15°C to +15°C |
II. Comprehensive Parameter Comparison Table
(1) AJ Series — R22 Refrigerant (Air Conditioning / Heat Pump / Medium & High-Temp Applications)
| No. | Model | Power Supply | Power (HP) | Disp. (cc) | Oil Chg. (cc) | Motor Type | Capacity @5°C/50°C (W) | COP (W/W) |
| 1 | AJ 5510F | 1PH 220V | 3/4 | 18.6 | 782 | PSC | 2,231 | 2.30 |
| 2 | AJ 5512E | 1PH 220V | 1 | 21.75 | 782 | PSC | 2,677 | 2.38 |
| 3 | AJ 5513E | 1PH 220V | 1-1/9 | 24.2 | 782 | PSC | 2,967 | 2.49 |
| 4 | AJ 5515E | 1PH 220V | 1-1/4 | 25.95 | 782 | PSC | — | 2.44 |
| 5 | TAJ 5515E | 3PH 400V | 1-1/4 | 25.95 | 782 | PSC | — | 2.50 |
| 6 | AJ 5518E | 1PH 220V | 1-1/2 | 32.7 | 782 | CSR | — | 2.29 |
| 7 | AJ 5519E | 1PH 220V | 1-4/7 | 34.45 | 782 | CSR | — | 2.24 |
| 8 | TAJ 5519E | 3PH 400V | 1-4/7 | 34.5 | 887 | CSR | — | — |
(2) CAE Series — R404A/R507/R22 Refrigerant (MBP/HBP Commercial Refrigeration)
| No. | Model | Pwr Supply | Power (HP) | Disp. (cc) | Oil Chg. (cc) | Refrigerant | Capacity Ref. (W) | Application |
| 1 | CAE 9450Z | 1PH 220V | 3/7 | 9.4 | 350 | R404A/R507 | 415W | MBP / HBP |
| 2 | CAE 9460Z | 1PH 220V | 1/2 | 11.3 | — | R404A/R507 | 875W @-10°C | MBP / HBP |
| 3 | CAE 9470Z | 1PH 220V | 1/2 | 13.3 | — | R404A/R507 | 1,078W @-10°C | MBP / HBP |
| 4 | CAE 4450E | 1PH 220V | 3/7 | 9.4 | — | R22 | ≈896W | MBP / HBP |
| 5 | CAE 9450T | 1PH 220V | 3/8 | 13.3 | — | R22 | 1,524W | MBP / HBP |
| 6 | CAE 9460T | 1PH 220V | 1/2 | — | — | R22 | ~1,758W (6,000 BTU) | MBP / HBP |
Notes:
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AJ series cooling capacity data is tested under the EN12900 standard condition (+5°C evaporation / +50°C condensation).
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The suffix "F" in AJ 5510F represents R134a refrigerant and is NOT interchangeable with R22 models such as AJ 5512E / 5513E.
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Oil charge: The AJ series uniformly uses 782 cc of Mineral oil with a viscosity of 68 cSt; CAE 9450Z uses 350 cc.
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CAE 9450Z and CAE 4450E share the same displacement (9.4 cc); the difference lies in the refrigerant (R404A/R507 vs R22).
III. Detailed Analysis of Model-Specific Advantages
(1) AJ Series — R22/R134a Air Conditioning & Medium/High-Temp Refrigeration Compressors
The AJ series is Tecumseh's most representative room air conditioner compressor series, enjoying an excellent service record among global manufacturers of window air conditioners, PTAC (Packaged Terminal Air Conditioner), and water source heat pumps.
AJ 5510F (3/4 HP, R134a) — Entry-Level R134a Medium/High-Temp Option
The AJ 5510F is the R134a refrigerant model in the AJ series, with a displacement of 18.6 cc, 3/4 HP power, and a 782 cc oil charge. It is compatible with 220-240V / Single-phase / 50Hz power and uses a PSC motor (Permanent Split Capacitor), with a starting current of 23.2A and a rated load current of 5.2A.
Under EN12900 standard conditions (+5°C evap / +50°C cond), cooling capacity reaches 2,231 W, with an input power of 970 W and an EER of 2.30 W/W. The evaporation temperature range covers -15°C to +15°C.
For small to medium R134a air conditioning systems, heat pump equipment, and refrigeration units requiring 3/4 HP medium-to-high temperature cooling capacity, the AJ 5510F, with its moderate power and stable PSC motor operation, serves as an economical choice for R134a systems.
AJ 5512E (1 HP, R22) — Mainstream Standard 1 HP Air Conditioning Option
The AJ 5512E is the standard 1 HP model in the AJ series, with a displacement of 21.75 cc. It uses R22 refrigerant, 220-240V / Single-phase / 50Hz power, and a PSC motor.
Under EN12900 standard conditions, cooling capacity reaches 2,677 W, input power is 1,126 W, and EER is 2.38 W/W. Starting current is 28A, rated load current is 5.9A. Evaporation temperature range: -15°C to +15°C.
For residential/commercial air conditioning, heat pumps, and small refrigeration equipment requiring standard 1 HP R22 cooling capacity, the AJ 5512E, backed by its widest market compatibility and stable PSC motor design, stands as the most demanded mainstream model in the AJ series.
AJ 5513E (1-1/9 HP, R22) — High-Capacity Upgrade Option
The AJ 5513E is a high-power model in the AJ series, with a displacement of 24.2 cc and 1-1/9 HP power. It uses R22 refrigerant and 220-240V / Single-phase / 50Hz power.
Under EN12900 standard conditions, cooling capacity reaches 2,967 W, input power is 1,193 W, and EER is 2.49 W/W—the highest energy efficiency ratio in the AJ series. Starting current is 34.1A, rated load current is 6.3A. Evaporation temperature range: -15°C to +15°C.
Compared to the AJ 5512E, displacement is increased by approx. 11%, further enhancing cooling capacity. For large window air conditioners, commercial air conditioning, and heat pump systems requiring greater capacity than a standard 1 HP, the AJ 5513E provides the best balance of performance and energy consumption with the series' highest EER (2.49). Note: Tecumseh's official engineering policy explicitly states that the AJ 5513E is NOT suitable for high-cycle frequency applications (such as frequently starting/stopping PTAC systems).
AJ 5515E / TAJ 5515E (1-1/4 HP, R22) — Single/Three-Phase Dual-Version High-Capacity Option
The AJ 5515E (Single-phase) and TAJ 5515E (Three-phase) are the 1-1/4 HP models in the AJ series, with a displacement of 25.95 cc.
The AJ 5515E uses R22 refrigerant, 220-240V / Single-phase / 50Hz power, with an EER of 2.44 W/W. The TAJ 5515E uses R22 refrigerant, 380-420V / Three-phase / 50Hz power (compatible with 460V/60Hz/3φ), with an EER of 2.50 W/W.
For large air conditioning systems and heat pump equipment requiring 1-1/4 HP R22 cooling capacity, the AJ 5515E / TAJ 5515E offer both single-phase and three-phase options—the single-phase version suits residential/commercial power, while the three-phase version suits industrial power environments for smoother operation. Note: The AJ 5515F (R134a version in the same series) requires heavy-duty internal springs when used in high-cycle frequency applications.
AJ 5518E (1-1/2 HP, R22) — High-Power Single-Phase Upgrade Option
The AJ 5518E is the 1-1/2 HP high-power model in the AJ series, with a displacement of 32.7 cc. It uses R22 refrigerant, 220-240V / Single-phase / 50Hz power, and a CSR motor (Capacitor Start Capacitor Run).
EER is 2.29 W/W. Evaporation temperature range: -15°C to +15°C.
Compared to the 5515E, displacement is increased by approx. 26%, resulting in a significant leap in cooling capacity. For large window air conditioners and commercial AC systems requiring 1-1/2 HP R22 cooling capacity, the AJ 5518E provides ample cooling reserves with its 32.7 cc large displacement. Note: Tecumseh's official engineering policy explicitly states that the AJ 5518E is NOT suitable for high-cycle frequency applications (such as frequently starting/stopping PTAC systems); such scenarios require alternative models like the AB5519F or G.
AJ 5519E / TAJ 5519E (1-4/7 HP, R22) — Maximum Power in AJ Series, Ultimate Solution
The AJ 5519E (Single-phase) and TAJ 5519E (Three-phase) are the flagship models with the highest power in the AJ series, featuring a displacement of 34.45 cc and 1-4/7 HP power.
The AJ 5519E uses R22 refrigerant, 220-240V / Single-phase / 50Hz power, with a running current of 10A, weight of 21.8 kg, and EER of 2.24 W/W. The TAJ 5519E uses R22 refrigerant, 380-420V / Three-phase / 50Hz power (compatible with 460V/60Hz/3φ), with a running current of 3.9A and weight of 21.3 kg.
As the top product of the AJ series, the AJ 5519E / TAJ 5519E, with their 34.45 cc超大 displacement and 1-4/7 HP maximum power, are specifically built for applications demanding the highest R22 medium-to-high temperature cooling capacity. Whether for large commercial air conditioning, high-load heat pump systems, or large refrigeration equipment, this model provides the most robust power guarantee. Note: Tecumseh's official engineering policy explicitly states that the AJ 5519E is NOT suitable for high-cycle frequency applications.
(2) CAE Series — R404A/R507/R22 Commercial Refrigeration Compressors
The CAE series is a hermetically sealed reciprocating compressor series specifically designed by Tecumseh for commercial refrigeration, widely used in medium/ high back pressure scenarios such as cold rooms, display cases, and walk-in coolers.
CAE 9450Z (3/7 HP, R404A/R507) — Entry-Level R404A Commercial Refrigeration Option
The CAE 9450Z is an entry-level model in the CAE Z series, with 9.4 cc displacement and 3/7 HP power. It uses R404A/R507 refrigerant and 220-240V / Single-phase / 50Hz power. Oil charge is 350 cc, rated load current is 2.8A, and locked rotor current is 13.1A.
Cooling capacity at -10°C evaporation is approx. 415 W. Applied in Medium/High Back Pressure (MBP/HBP) scenarios.
For small commercial cold rooms, display cases, and walk-in coolers requiring R404A medium-temperature refrigeration, the CAE 9450Z achieves a precise balance of performance and cost with its moderate 3/7 HP power and 9.4 cc displacement.
CAE 9460Z (1/2 HP, R404A/R507) — Standard R404A Commercial Refrigeration Option
The CAE 9460Z is the standard 1/2 HP model in the CAE Z series, with a displacement of 10.33–11.3 cc. It uses R404A/R507 refrigerant and 220-240V / Single-phase / 50Hz power.
Cooling capacity is approx. 875 W at -10°C evap / +45°C cond; and approx. 546 W at -15°C evap / +32°C cond.
For medium-sized commercial cold rooms and refrigerated display cases requiring standard 1/2 HP R404A cooling capacity, the CAE 9460Z provides more ample cooling reserves, making it the mainstream choice for R404A commercial refrigeration systems.
CAE 9470Z (1/2 HP, R404A/R507) — Large Displacement Commercial Refrigeration Option
The CAE 9470Z is a large displacement model in the CAE Z series, with 1/2 HP power and a displacement of up to 13.3 cc. It uses R404A/R507 refrigerant and 220-240V / Single-phase / 50Hz power.
Cooling capacity reaches 1,078 W at -10°C evap / +45°C cond. Compared to the CAE 9460Z, displacement is increased by approx. 18–30%, significantly enhancing cooling capacity.
For large commercial cold rooms and high-load display cases requiring greater capacity than the CAE 9460Z, the CAE 9470Z provides the strongest cooling capacity within the same power rating of the Z series with its 13.3 cc displacement.
CAE 4450E (3/7 HP, R22) — Classic R22 Commercial Refrigeration Option
The CAE 4450E is a classic model in the CAE E series, with 9.4 cc displacement and 3/7 HP power. It uses R22 refrigerant and 220-240V / Single-phase / 50Hz power.
Cooling capacity is approx. 896 W. Suitable for Medium/High Back Pressure (MBP/HBP) scenarios.
As a classic model in the Tecumseh CAE family, the CAE 4450E enjoys wide compatibility and a good reputation in the commercial refrigeration market. For small to medium R22 cold rooms, display cases, and walk-in coolers where evaporator capacity is around 900 W and starting conditions are stable, the CAE 4450E is an economical and efficient choice.
CAE 9450T (3/8 HP, R22) — R22 Medium-Temp Refrigeration Option
The CAE 9450T is the 3/8 HP model in the CAE T series, with a displacement of 13.3 cc. It uses R22 refrigerant and 220-240V / Single-phase / 50Hz power.
Cooling capacity is approx. 1,524 W. Suitable for Medium/High Back Pressure (MBP/HBP) scenarios.
Compared to the CAE 4450E, displacement is increased by approx. 41%, significantly boosting cooling capacity. For medium-sized R22 cold rooms and commercial refrigeration equipment requiring greater medium-temperature cooling capacity, the CAE 9450T provides ample cooling reserves with its 13.3 cc displacement and 1,524 W capacity.
CAE 9460T (1/2 HP, R22) — High-Capacity R22 Option
The CAE 9460T is the 1/2 HP model in the CAE T series, using R22 refrigerant and 220-240V / Single-phase / 50Hz power.
Cooling capacity is approx. 6,000 BTU/h (approx. 1,758 W). The evaporation temperature range covers -25°C to +15°C. Suitable for Medium Back Pressure (MBP) scenarios.
As the most powerful model in the CAE T series, the CAE 9460T, with its 6,000 BTU/h capacity and wide temperature adaptability from -25°C to +15°C, is specifically designed for commercial scenarios with high R22 medium-temperature cooling demands.
IV. Quick Selection Guide by Application Scenario
| Application Scenario | Recommended Model | Power Supply | Refrigerant |
| Small/Medium R134a AC / Heat Pump | AJ 5510F | 1PH 220V | R134a |
| Standard 1 HP AC / Heat Pump | AJ 5512E | 1PH 220V | R22 |
| Large AC / High Efficiency Demand | AJ 5513E | 1PH 220V | R22 |
| Large AC (Single-Phase) | AJ 5515E | 1PH 220V | R22 |
| Large AC (Three-Phase) | TAJ 5515E | 3PH 400V | R22 |
| High-Power AC (Single-Phase) | AJ 5518E | 1PH 220V | R22 |
| Max Power AC (Single-Phase) | AJ 5519E | 1PH 220V | R22 |
| Max Power AC (Three-Phase) | TAJ 5519E | 3PH 400V | R22 |
| R404A Small Cold Room / Display Case | CAE 9450Z | 1PH 220V | R404A/R507 |
| R404A Medium Cold Room | CAE 9460Z | 1PH 220V | R404A/R507 |
| R404A Large Cold Room | CAE 9470Z | 1PH 220V | R404A/R507 |
| R22 Small/Medium Cold Room | CAE 4450E | 1PH 220V | R22 |
| R22 Medium Cold Room | CAE 9450T | 1PH 220V | R22 |
| R22 Large Cold Room | CAE 9460T | 1PH 220V | R22 |
Quick Selection Steps:
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Determine scenario first: For Air Conditioning/Heat Pumps → Select AJ series; For commercial cold rooms/display cases → Select CAE series.
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Select refrigerant: R22 → Suffix E/T; R404A/R507 → Suffix Z; R134a → Suffix F.
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Determine power supply: Single-phase 220V → Select AJ/CAE; Three-phase 400V → Select TAJ.
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Determine power: Progressively increase from 5510F (3/4 HP) to 5519E (1-4/7 HP).
V. Frequently Asked Questions (FAQ)
Q1: What is the difference between models starting with AJ, TAJ, and CAE?
A: AJ is the single-phase version (220-240V/50Hz), mainly used for air conditioning and heat pumps; TAJ is the three-phase version (400V/50Hz), suitable for industrial power environments; CAE is a series dedicated to commercial refrigeration, mainly used in medium/high back pressure scenarios such as cold rooms and display cases. Their technical parameters are similar; the main differences lie in application scenarios and power supply configurations.
Q2: Why can't the AJ 5513E, AJ 5518E, and AJ 5519E be used in high-cycle frequency applications?
A: The AJ 5513E, AJ 5518E, and AJ 5519E are NOT suitable for high-cycle frequency applications (such as frequently starting/stopping PTAC systems). Such scenarios require alternative models like the AK8515E or AB5519F/G. High cycle frequency may cause the internal mounting springs of the compressor to exceed their designed service life.
Q3: What is the difference between the CAE 9450Z and CAE 4450E?
A: Both share the same displacement (9.4 cc) and power (3/7 HP). The main difference is the refrigerant: the CAE 9450Z uses R404A/R507, while the CAE 4450E uses R22. Their refrigeration oils are also different (POE ester oil for R404A, Mineral oil for R22) and they are NOT interchangeable.
