I. Series Overview
The CAJ/TAJ series comprises hermetic reciprocating commercial refrigeration compressors from the French brand Tecumseh, widely used in medium and high-temperature commercial refrigeration and air conditioning applications. Covering a power range from approximately 5/8 HP to 1-3/4 HP, this series offers three refrigerant versions: R22 (suffix T), R404A/R507 (suffix Z), and R134a (suffix Y).
| Feature Dimension | Description |
| Technology Type | Hermetic Reciprocating |
| Power Range | 5/8 HP – 1-3/4 HP |
| Displacement Range | 15.2 cc – 34.45 cc |
| Refrigerant | R22 (T) / R404A/R507 (Z) / R134a (Y) |
| Power Supply | 1PH 220-240V/50Hz (CAJ) or 3PH 400V/50Hz (TAJ) |
| Application Temp. | Medium/High Temp (HBP/MBP), some models cover -25°C to +15°C |
Common Features: The entire series adopts a hermetic reciprocating design, with the motor and piston sealed within the same welded housing to effectively minimize leakage and simplify on-site maintenance. The CAJ/TAJ series features solder connections, with a Rotalock valve on the suction side.
Core Naming Rules:
No prefix ( CAJ) = Single-phase version (220-240V); T prefix ( TAJ) = Three-phase version (400V).
T suffix = R22 refrigerant; Z suffix = R404A/R507 refrigerant; Y suffix = R134a refrigerant.
Numeric Code: The first two digits (94/95/45, etc.) represent the series; the last three digits (80/10/13/17/19/52/61/76/92, etc.) represent the specific model.
II. Comprehensive Parameter Comparison Table
(A) T Series — R22 Refrigerant (Medium/High-Temp Applications)
| No. | Model | Power Supply | Power (HP) | Disp. (cc) | Oil Charge (cc) | Cooling Capacity Ref. (W) | Application Temp. |
| 1 | CAJ9480T / TAJ9480T | 1PH/3PH | 5/8 | 15.20 | 887 | 2,103 (@+7.2°C) | M/H Temp |
| 2 | CAJ9510T / TAJ9510T | 1PH/3PH | 1 | 18.30 | 887 | 2,510 (@+7.2°C) | M/H Temp |
| 3 | CAJ9513T / TAJ9513T | 1PH/3PH | 1-1/8 | 24.20 | 887 | 3,272 (@+7.2°C) | M/H Temp |
| 4 | CAJ4519T / TAJ4519T | 1PH/3PH | 1-3/4 | 34.45 | 887 | 4,738 (@+7.2°C) | M/H Temp |
Note: CAJ4517E is the 1-1/4 HP version for R22 (displacement 25.95 cc, cooling capacity 3,629 W @+7.2°C); CAJ/TAJ4517T is the same specification.
(B) Z Series — R404A/R507 Refrigerant (Medium/High & Medium/Low-Temp Applications)
| No. | Model | Power Supply | Power (HP) | Disp. (cc) | Oil Charge (cc) | Cooling Capacity Ref. (W) | Application Temp. |
| 1 | CAJ9480Z / TAJ9480Z | 1PH/3PH | 5/8 | 15.20 | 887 | 2,172 (@+7.2°C) | M/H Temp |
| 2 | CAJ9510Z / TAJ9510Z | 1PH/3PH | 1 | 18.30 | 887 | 2,650 (@+7.2°C) | M/H Temp |
| 3 | CAJ9513Z / TAJ9513Z | 1PH/3PH | 1-1/8 | 24.20 | 887 | 3,406 (@+7.2°C) | -25°C to +15°C |
| 4 | CAJ4517Z / TAJ4517Z | 1PH/3PH | 1-1/4 | 25.95 | 887 | 3,860 (@+7.2°C) | M/H Temp |
| 5 | CAJ4519Z / TAJ4519Z | 1PH/3PH | 1-3/4 | 34.45 | 887 | 5,030 (@+7.2°C) | M/H Temp |
(C) Y Series — R134a Refrigerant (Medium/High-Temp Applications)
| No. | Model | Power Supply | Power (HP) | Disp. (cc) | Oil Charge (cc) | Cooling Capacity Ref. (W) | Application Temp. |
| 1 | CAJ4452Y | 1PH | 3/7 | 15.2 | 887 | 957 (@+7.2°C) | M/H Temp |
| 2 | CAJ4461Y / TAJ4461Y | 1PH/3PH | 1/2 | 18.3 | 887 | 1,115 (@+7.2°C) | M/H Temp |
| 3 | CAJ4476Y | 1PH | 5/8 | 21.75 | 887 | 1,358 (@+7.2°C) | M/H Temp |
| 4 | CAJ4492Y / TAJ4492Y | 1PH/3PH | 3/4 | 25.95 | 887 | 1,617 (@+7.2°C) | M/H Temp |
Note: The above cooling capacity data are nominal values at +7.2°C evaporation temperature; actual performance may vary depending on operating conditions. Alternative models for CAJ4452Y and CAJ4461Y are AE4456N and AJ4461N-FZ respectively.
III. Detailed Explanation of Model-Specific Advantages
The following describes the unique value of each model by refrigerant type (T series R22 / Z series R404A/R507 / Y series R134a) and power rating.
(A) T Series — R22 Refrigerant Medium/High-Temp Compressors
The T series uses R22 refrigerant, positioned for medium/high-temperature (HBP/MBP) commercial refrigeration, representing the classic product line of the Tecumseh CAJ family.
CAJ9480T / TAJ9480T (5/8 HP) — Classic Entry-Level Choice
The CAJ9480T is the entry-level classic model in the T series, with a displacement of 15.20 cc and power of 5/8 HP. As a French-made hermetic reciprocating compressor, it adopts a CSR motor (Capacitor Start Capacitor Run), providing high starting torque and stable single-phase grid operation. Rated load current is approx. 4.0 A, locked rotor current approx. 24 A.
For scenarios requiring approx. 2 kW of medium-temperature cooling capacity — such as small walk-in coolers, butcher shop refrigerators, beverage coolers, and pastry display cases — the CAJ9480T, with its reliable French Tecumseh quality and moderate power, is the most trusted entry-level choice for contractors and equipment manufacturers worldwide. The three-phase version TAJ9480T is compatible with 400V industrial power, suitable for large equipment integration.
CAJ9510T / TAJ9510T (1 HP) — Standard 1 HP Mainstream Choice
The CAJ9510T is the standard 1 HP model in the T series, with a displacement of 18.30 cc. Compared to the 9480T, displacement increases by approx. 20%, significantly boosting cooling capacity.
For medium cold rooms, commercial display cases, and food service refrigeration equipment requiring standard 1 HP cooling capacity, the CAJ9510T offers the widest compatibility — 1 HP is one of the most mainstream specifications in commercial refrigeration. The single-phase version is compatible with 220V power, and the three-phase version with 400V.
CAJ9513T / TAJ9513T (1-1/8 HP) — High-Capacity Step-Up Choice
The CAJ9513T is a high-power model in the T series, with a displacement of 24.20 cc and power of 1-1/8 HP. Compared to the 9510T, displacement increases by approx. 32%, further enhancing cooling capacity.
For large commercial freezers and high-load display cases requiring more cooling than a standard 1 HP, the CAJ9513T provides a precise "step-up" option.
CAJ4519T / TAJ4519T (1-3/4 HP) — Maximum Power in T Series
The CAJ4519T is the most powerful model in the T series, with a displacement of 34.45 cc and power of 1-3/4 HP. As the top-tier product of the series, it is engineered for applications with the highest R22 medium-temperature cooling demands, delivering the largest displacement and strongest cooling capacity.
(B) Z Series — R404A/R507 Refrigerant Medium/High & Medium/Low-Temp Compressors
The Z series uses R404A/R507 refrigerant, covering both medium/high-temperature (HBP) and medium/low-temperature (MBP) applications.
CAJ9480Z / TAJ9480Z (5/8 HP) — R404A Entry-Level Choice
The CAJ9480Z is the entry-level model in the Z series, with a displacement of 15.20 cc and power of 5/8 HP. Suitable for R404A/R507 refrigerant. Cooling capacity at -15°C / +45°C is approx. 920 W.
For small to medium R404A cold rooms and refrigerated display cases requiring medium-temperature R404A cooling, the CAJ9480Z achieves a precise balance of performance and cost with its moderate 5/8 HP power.
CAJ9510Z / TAJ9510Z (1 HP) — R404A Standard 1 HP Choice
The CAJ9510Z is the standard 1 HP model in the Z series, with a displacement of 18.30 cc. Suitable for medium/high-temperature (MBP/HBP) applications.
For medium R404A cold rooms and commercial display cases requiring standard 1 HP R404A cooling capacity, the CAJ9510Z provides a widely compatible solution.
CAJ9513Z / TAJ9513Z (1-1/8 HP) — Wide Temperature Range Choice
The CAJ9513Z is a high-power model in the Z series, with a displacement of 24.20 cc and power of 1-1/8 HP. Its evaporation temperature range covers -25°C to +15°C, suitable for both medium/low and medium/high-temperature scenarios.
For commercial refrigeration equipment requiring wider temperature adaptability — such as multi-functional display cases capable of both refrigeration and freezing — the CAJ9513Z provides greater flexibility and stronger cooling reserve.
CAJ4517Z / TAJ4517Z (1-1/4 HP) — R404A High-Capacity Choice
The CAJ4517Z is a high-power model in the Z series, with a displacement of 25.95 cc and power of 1-1/4 HP. Cooling capacity at +7.2°C reaches 3,860 W.
For large R404A cold rooms and high-load commercial refrigeration equipment requiring more cooling than 1-1/8 HP, the CAJ4517Z provides ample cooling reserve.
CAJ4519Z / TAJ4519Z (1-3/4 HP) — Maximum Power in Z Series
The CAJ4519Z is the most powerful flagship model in the Z series, with a displacement of 34.45 cc and power of 1-3/4 HP. Cooling capacity at +7.2°C reaches 5,030 W. As the top-tier product of the series, it satisfies the most demanding commercial refrigeration needs with its maximum displacement and strongest R404A cooling capacity.
(C) Y Series — R134a Refrigerant Medium/High-Temp Compressors
The Y series uses R134a refrigerant, positioned for medium/high-temperature (HBP) commercial refrigeration applications.
CAJ4452Y (3/7 HP) — R134a Entry-Level Choice
The CAJ4452Y is the entry-level model in the Y series, with a displacement of 15.2 cc and power of 3/7 HP. Suitable for R134a refrigerant.
For small R134a refrigeration equipment, beverage coolers, and display cases requiring small-power medium-temperature cooling, the CAJ4452Y provides a cost-effective solution.
CAJ4461Y / TAJ4461Y (1/2 HP) — R134a Standard Choice
The CAJ4461Y is the standard model in the Y series, with a displacement of 18.3 cc and power of 1/2 HP. Cooling capacity at +7.2°C reaches 1,115 W.
For medium R134a refrigeration equipment and commercial display cases requiring standard 1/2 HP cooling capacity, the CAJ4461Y offers the most widely compatible choice. The three-phase version TAJ4461Y is compatible with 400V power.
CAJ4476Y (5/8 HP) — R134a High-Capacity Choice
The CAJ4476Y is a high-power model in the Y series, with a displacement of 21.75 cc and power of 5/8 HP. Cooling capacity at +7.2°C reaches 1,358 W.
For larger volume R134a refrigeration equipment and supermarket cold chain display cases requiring more cooling than 1/2 HP, the CAJ4476Y provides more abundant cooling capacity.
CAJ4492Y / TAJ4492Y (3/4 HP) — Maximum Power in Y Series
The CAJ4492Y is the most powerful model in the Y series, with a displacement of 25.95 cc and power of 3/4 HP. Cooling capacity at +7.2°C reaches 1,617 W. As the top-tier product of the Y series, it meets the demands of large-volume commercial refrigeration equipment with its maximum R134a cooling capacity.
IV. Series-Wide Common Advantages
Features
Hermetic Reciprocating Piston Structure: Motor and piston sealed within the same welded housing.
Multi-Refrigerant Compatibility: T series (R22), Z series (R404A/R507), Y series (R134a).
Dual Voltage Versions: Single-phase (CAJ) and three-phase (TAJ) options available.
CSR Motor: Capacitor Start Capacitor Run for high starting torque.
Rotalock Suction Valve: Standard Rotalock valve on suction side for CAJ/TAJ series.
Solder Connections: Tubing uses solder connections.
Oil Charge: Uniform oil charge of 887 cc across the entire series.
Advantages
Hermetic structure provides excellent sealing, effectively reducing refrigerant leakage.
CSR motor design ensures stable starting and operation on single-phase power grids.
Complete power spectrum from 5/8 HP to 1-3/4 HP covers all medium/high-temperature scenarios.
French-made with reliable quality and exquisite craftsmanship.
Rotalock valve design facilitates on-site maintenance and replacement.
Benefits
Stable and Reliable Operation: Tecumseh's high-reliability design ensures long-term trouble-free operation of refrigeration equipment.
Easy Maintenance: Hermetic structure reduces leakage points; Rotalock valve simplifies service operations.
Flexible Selection: Three refrigerants × dual voltage versions × complete power spectrum ensure the most suitable model for every project.
V. Quick Selection Guide by Application Scenario
| Application Scenario | Recommended Model | Power Supply | Refrigerant |
| Small cold rooms, butcher shop refrigerators | CAJ9480T / TAJ9480T | 1PH/3PH | R22 |
| Medium cold rooms, commercial display cases | CAJ9510T / TAJ9510T | 1PH/3PH | R22 |
| Large commercial freezers | CAJ9513T / TAJ9513T | 1PH/3PH | R22 |
| Large cold rooms | CAJ4519T / TAJ4519T | 1PH/3PH | R22 |
| R404A small/medium cold rooms | CAJ9480Z / TAJ9480Z | 1PH/3PH | R404A |
| R404A medium cold rooms | CAJ9510Z / TAJ9510Z | 1PH/3PH | R404A |
| R404A wide-temp display cases | CAJ9513Z / TAJ9513Z | 1PH/3PH | R404A |
| R404A large cold rooms | CAJ4517Z / TAJ4517Z | 1PH/3PH | R404A |
| R404A large commercial refrigeration | CAJ4519Z / TAJ4519Z | 1PH/3PH | R404A |
| Small R134a refrigeration equipment | CAJ4452Y | 1PH | R134a |
| Medium R134a display cases | CAJ4461Y / TAJ4461Y | 1PH/3PH | R134a |
| Large R134a refrigeration equipment | CAJ4476Y | 1PH | R134a |
| Large-volume R134a commercial freezers | CAJ4492Y / TAJ4492Y | 1PH/3PH | R134a |
Quick Selection:
Select refrigerant first: Choose T series for R22, Z series for R404A/R507, Y series for R134a.
Select power supply: Choose CAJ for 1PH 220V, TAJ for 3PH 400V.
Select power: 5/8 HP → 9480, 1 HP → 9510, 1-1/8 HP → 9513, 1-1/4 HP → 4517, 1-3/4 HP → 4519.
Y series specific: 3/7 HP → 4452, 1/2 HP → 4461, 5/8 HP → 4476, 3/4 HP → 4492.
VI. Frequently Asked Questions (FAQ)
Q1: What is the difference between models starting with CAJ and TAJ?
A: CAJ is the single-phase (1PH) version, compatible with 220-240V/50Hz power; TAJ is the three-phase (3PH) version, compatible with 400V/50Hz power. Their technical parameters are the same, differing only in power supply type.
Q2: What do the suffixes T, Z, and Y represent?
A: T suffix = R22 refrigerant; Z suffix = R404A/R507 refrigerant; Y suffix = R134a refrigerant. They use different refrigerants and different refrigeration oils (mineral/alkylbenzene oil for R22, POE ester oil for R404A/R134a), and cannot be interchanged.
Q3: What temperature range is the CAJ/TAJ series suitable for?
A: The CAJ/TAJ series is primarily positioned for medium/high-temperature (HBP/MBP) applications. Some Z series models (e.g., CAJ9513Z) cover an evaporation temperature range of -25°C to +15°C. Typical applications include positive-temperature cold rooms, commercial refrigerators, and display cases.
