I. Series Overview
The CAH/TFG series consists of hermetically sealed twin-cylinder reciprocating commercial refrigeration compressors from the French brand Tecumseh. They are specifically designed for medium and high-temperature (HBP) commercial refrigeration applications. This series utilizes R134a refrigerant, covers a power range from 1-1/2 HP to 2 HP, and serves as an ideal power source for medium-temperature commercial refrigeration equipment.
| Feature Dimension | Description |
| Technology Type | Hermetically sealed reciprocating (twin-cylinder) |
| Power Range | 1-1/2 HP – 2 HP |
| Displacement Range | 53.2 cc – 74.25 cc |
| Refrigerant | R134a / R513A |
| Application Temp. | High Back Pressure (HBP): -15°C to +15°C |
| Motor Type | CSR (Capacitor Start Capacitor Run), High Starting Torque (HST) |
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Common Characteristics: The entire series features a hermetically sealed twin-cylinder reciprocating design, with the motor and pistons sealed within the same welded shell, effectively reducing leakage and simplifying on-site maintenance.
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Core Naming Rules:
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CAH prefix = Single-phase version (220-240V/50Hz)
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TFG prefix = Three-phase version (400V/50Hz)
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Y suffix = R134a/R513A refrigerant
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Numerical code: 45 represents the series; 18 represents 1-1/2HP; 25 represents 2HP
II. Comprehensive Parameter Comparison Table
| No. | Model | Power Supply | Power (HP) | Refrigerant | Displacement (cc) | Oil Charge (cc) | Weight (kg) | Cooling Capacity @+7.2°C (W) | Cooling Capacity @+15°C (W) |
| 1 | CAH 4518Y | 1PH 220-240V | 1-1/2 | R134a/R513A | 53.2 | 1330 | ~27 | 3,200 | 4,583 |
| 2 | TFG 4518Y | 3PH 400V | 1-1/2 | R134a/R513A | 53.2 | 1330 | ~27 | 3,200 | 4,583 |
| 3 | CAH 4525Y | 1PH 220-240V | 2 | R134a/R513A | 74.25 | 1330 | ~33 | 4,239 | 6,053 |
| 4 | TFG 4525Y | 3PH 400V | 2 | R134a/R513A | 74.25 | 1330 | ~33 | 4,239 | 6,053 |
Note: Specific values may vary depending on test conditions.
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The full series has a uniform oil charge of 1330 cc, using POE (Polyolester) oil with a viscosity of 32 cSt.
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Starting current for single-phase CAH 4518Y is approx. 51 A; for three-phase TFG 4518Y, approx. 24 A.
III. Detailed Analysis of Model-Specific Advantages
(1) CAH 4518Y / TFG 4518Y (1-1/2 HP) — The "Golden Choice" for Medium & High-Temp Refrigeration
The CAH 4518Y (single-phase) and TFG 4518Y (three-phase) are the standard 1-1/2 HP models in the CAH/TFG series, featuring a displacement of 53.2 cc. Designed specifically for R134a/R513A refrigerants, they are suitable for High Back Pressure (HBP) medium-to-high temperature applications, with an evaporation temperature range of -15°C to +15°C.
As the model with a moderate power threshold and precise cooling capacity match in the series, the CAH 4518Y/TFG 4518Y employs a CSR high starting torque motor design. It can still deliver 208 W of cooling capacity at the -15°C low end, while reaching 3,200 W at the +7.2°C medium-temperature condition, and up to 4,583 W at the +15°C high-temperature condition. This compressor features a hermetically sealed twin-cylinder reciprocating structure, ensuring smooth and reliable operation.
For applications requiring 1-1/2 HP medium-temperature cooling capacity—such as medium-sized cold rooms, commercial display cases, fresh-keeping freezers, and supermarket cold chain equipment—the CAH 4518Y/TFG 4518Y, backed by French Tecumseh's reliable quality and precise cooling capacity matching, becomes the "golden choice" for equipment manufacturers and service technicians. The single-phase version (CAH 4518Y) is compatible with 220-240V residential/commercial power, while the three-phase version (TFG 4518Y) is compatible with 400V industrial power, flexibly meeting different power supply conditions. Its wide voltage design (Single-phase 187-242V, Three-phase 340-440V) further ensures stable operation under fluctuating grid conditions.
(2) CAH 4525Y / TFG 4525Y (2 HP) — The High-Capacity Upgrade Option
The CAH 4525Y (single-phase) and TFG 4525Y (three-phase) are the 2 HP high-power models in the CAH/TFG series, with displacement increased to 74.25 cc. Compared to the 4518Y, displacement has increased by nearly 40%, resulting in a significant leap in cooling capacity.
At the -25°C low end, the 4525Y's cooling capacity reaches 1,155 W, which is more than 5.5 times that of the 4518Y (208 W). At the +7.2°C medium-temperature condition, cooling capacity reaches 4,239 W, and at +15°C, it can reach 6,053 W. Under EN12900 standard testing (+5°C evaporation / +50°C condensation), cooling capacity reaches 5,385 W, with an input power of 1,888 W and an energy efficiency ratio (EER) of 2.85 W/W.
For large cold rooms, high-load commercial refrigeration equipment, food processing cold chains, and large supermarket display cases requiring greater cooling capacity than 1-1/2 HP, the CAH 4525Y/TFG 4525Y provides ample cooling reserves. Its 74.25 cc large displacement and 2 HP rated power allow it to easily handle high-load, large-space refrigeration demands. The single-phase version has a starting current of approx. 68 A, and the three-phase version approx. 25 A. For noise-sensitive applications, the sound power level of this model is approx. 73 dB(A).
IV. Series-Wide Common Advantages (FAB Analysis)
Features:
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Hermetically sealed twin-cylinder reciprocating structure: Highly reliable commercial reciprocating compressor design; motor and pistons sealed in the same welded shell.
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R134a/R513A refrigerant compatibility: Compatible with R134a and the low-GWP environmentally friendly refrigerant R513A.
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Dual voltage versions: Single-phase (CAH) and three-phase (TFG) versions available.
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CSR high starting torque motor: Capacitor start capacitor run, high starting torque (HST).
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Wide voltage design: Single-phase 187-242V, Three-phase 340-440V.
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Class F insulated motor: High-efficiency, low-slip, large-volume Class F insulated motor.
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Oil charge: Uniform oil charge of 1330 cc across the series; POE ester oil, viscosity 32 cSt.
Advantages:
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The hermetically sealed structure offers excellent sealing performance, effectively reducing refrigerant leakage.
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CSR motor design ensures stable starting and operation under single-phase power grids.
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The twin-cylinder reciprocating structure operates smoothly with low vibration, suitable for long-term continuous operation.
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High-efficiency motor ensures a perfect balance of high cooling capacity and low power consumption.
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Wide voltage design allows it to adapt to grid conditions in different regions.
Benefits:
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Stable and Reliable Operation: High-reliability design ensures long-term, trouble-free operation of refrigeration equipment.
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Energy Saving and High Efficiency: High-efficiency motor reduces power consumption, saving users long-term operating costs.
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Flexible Installation: Dual single/three-phase versions adapt to different power supply environments.
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Precise Model Selection: Power coverage from 1-1/2 HP to 2 HP ensures the most suitable model for every project.
V. Quick Selection Guide by Application Scenario
| Application Scenario | Recommended Model | Power Supply | Key Advantage |
| Medium cold rooms, fresh-keeping freezers | CAH 4518Y | 1PH 220V | 1-1/2 HP precise match, economical and efficient |
| Medium cold rooms (Industrial power) | TFG 4518Y | 3PH 400V | 1-1/2 HP, smoother operation |
| Large cold rooms, food processing cold chain | CAH 4525Y | 1PH 220V | 2 HP high capacity, ample cooling reserve |
| Large cold rooms (Industrial power) | TFG 4525Y | 3PH 400V | 2 HP high capacity, suitable for continuous high load |
| Commercial display cases, supermarket cold chain | CAH 4518Y / 4525Y | 1PH 220V | Select power based on cabinet volume |
| Industrial-grade refrigeration equipment | TFG 4518Y / 4525Y | 3PH 400V | Three-phase power, suitable for industrial environments |
Quick Selection Steps:
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Determine power supply first: Single-phase 220V → Select CAH; Three-phase 400V → Select TFG.
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Determine power: 1-1/2 HP → 4518Y; 2 HP → 4525Y.
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Determine scenario: Small/medium capacity → Select 4518Y; Large capacity / High load → Select 4525Y.
VI. Frequently Asked Questions (FAQ)
Q1: What is the difference between models starting with CAH and TFG?
A: CAH is the single-phase (1PH) version, compatible with 220-240V/50Hz power supply; TFG is the three-phase (3PH) version, compatible with 380-420V/50Hz or 460V/60Hz power supply. Their technical parameters are identical; only the power supply configuration differs.
Q2: What is the main difference between the 4518Y and 4525Y?
A: The 4518Y is 1-1/2 HP with a displacement of 53.2 cc; the 4525Y is 2 HP with a displacement of 74.25 cc. The displacement of the 4525Y is approximately 40% greater than the 4518Y, resulting in significantly stronger cooling capacity.
Q3: What is the cooling capacity of these compressors?
A: Taking the +7.2°C condition as an example: the 4518Y cooling capacity is approx. 3,200 W, and the 4525Y is approx. 4,239 W. At the +15°C high-temperature condition, the 4518Y can reach 4,583 W, and the 4525Y can reach 6,053 W.
