The Embraco EMT2125GK is a compact yet powerful hermetic reciprocating compressor designed specifically for low back pressure (LBP) refrigeration applications. Built to operate with R-404A refrigerant, this model delivers stable cooling performance in low-temperature systems such as commercial freezers, ice cream cabinets, display freezers, and other deep-freeze refrigeration units. With its durable construction, efficient motor design, and optimized internal components, the EMT2125GK stands out as a reliable solution for technicians and OEM manufacturers who need dependable low-temperature operation. EMBRACO Compressor EMT2125GK 1/3+HP, 220-240V, R134A.
EMT2125GK Compressor Application & Operating Range
This compressor is engineered for LBP applications with an evaporating temperature range of –40°C to –10°C, making it ideal for deep-freezing conditions. Under standard ASHRAE LBP 32 operating conditions,EMBRACO Compressor EMT2125GK 1/3+HP, 220-240V, R134A it provides:
| Cooling Capacity | 354.45 W |
| Power Consumption | 248.64 W |
| Mass Flow Rate | 8.24 kg/h |
| Efficiency (COP) | 1.43 W/W |
The unit can handle a permanent operating temperature of 55°C (60°C peak) and maintains a maximum motor temperature of 130°C, ensuring safe and stable performance even in demanding environments.
EMBRACO EMT2125GK SPECIFICATIONS
| COMPANY | EMBRACO |
| Full MODEL | EMT2125GK |
| Refrigerant | R404A & R507 |
| VOLTAGE | 220-240v |
| FREQUENCY | 50HZ |
| Horse Power | 1/3+HP |
| Motor Type | CSIR |
| Compressor Type | HERMATIC |
| Application | Low back pressure |
| WEIGHT | 7.80kg |
| Starting Capacitor | 64 – 77uf |
| Displacement | 5.96cm |
| Oil Charge | 180ML |
| Origin | Brazil |
Mechanical Design & Construction OF EMT2125GK
The EMT2125GK features a 5.96 cm³ displacement, with a 22.5 mm bore and 7.5 mm stroke, carefully balanced for efficient compression at low evaporating temperatures. It uses fan cooling to maintain proper shell temperature and enhance reliability during extended operation. The suction and discharge connectors are copper, with a 6.10 mm suction connector (42° slanted) and a 4.86 mm straight discharge connector, ensuring easy brazing and secure installation.
Key Mechanical Features
| Weight | 7.8 kg |
| Lubricant | POLYOLESTER (POE) ISO22 |
| Oil Charge | 180 ml |
| Base Plate | European standard tray holder |
| Metal Bushing | Optional |
| Rubber Dampers | Yes (for vibration reduction) |
Motor & Electrical System & Specifications
This compressor uses a CSIR (Capacitor Start, Induction Run) motor configuration, providing high starting torque (HST). That makes it highly suitable for low-temperature applications where starting under load is common. The CSIR design ensures strong initial torque while maintaining efficient running performance, which improves system reliability during frequent cycling.
| LRA (Locked Rotor Amps) | 9.8 A |
| Frequency | 50 Hz |
| Voltage | 220–240V |
| Starter Device | Current relay |
| Starting Capacitor | 64–77 µF |
| Phase | Single phase |
| Thermal Protector | T0571/G6 |
Performance at Different Conditions
The Embraco EMT2125GK maintains solid and dependable efficiency across a wide range of evaporating and condensing temperatures, making it well-suited for low back pressure applications. At a condensing temperature of 35°C, the compressor delivers 339.74 watts of cooling capacity at –30°C evaporating temperature with a COP of 1.74. When the evaporating temperature increases to –20°C, the cooling capacity rises significantly to 539.93 watts, and the efficiency improves to a COP of 2.25. At –10°C, performance becomes even stronger, reaching 826.61 watts of cooling capacity with an impressive COP of 2.92. This clearly demonstrates that as the evaporating temperature increases, both cooling capacity and efficiency improve accordingly. Even when operating at higher condensing temperatures such as 45°C and 55°C, the compressor continues to run reliably, although with moderate reductions in efficiency, which is typical behavior for LBP refrigeration systems.
Expansion Device Compatibility OF EMBRACO Compressor EMT2125GK
Proper capillary selection significantly impacts system performance, so technicians should verify sizing based on actual system load and design conditions. The EMT2125GK works with capillary tube & expansion valve
For preliminary testing, the recommended capillary tube sizing is following :
- Length: 4.00 meters
- Internal Diameter: 0.91 mm
- Application: LBP
Efficiency & Energy Performance
Under EN12900 LBP conditions:
- Cooling Capacity: 200.92 W
- Power Consumption: 177.77 W
- Efficiency: 1.13 W/W
At MBP testing conditions (for reference), efficiency increases to 1.81 W/W, demonstrating the compressor’s strong internal compression design. Overall, the EMT2125GK offers balanced energy efficiency for commercial low-temperature refrigeration systems, particularly in applications requiring stable deep-freeze operation.EMBRACO Compressor EMT2125GK 1/3+HP, 220-240V, R134A.
Installation & Service Considerations
To ensure a long and reliable service life, the Embraco EMT2125GK requires proper installation and regular maintenance. Technicians should follow correct POE-compatible R-404A refrigerant handling procedures and maintain accurate oil management to protect internal components. In addition, adequate airflow must be provided for fan cooling to prevent overheating during operation. It is important to install the specified 64–77 µF starting capacitor to guarantee smooth and efficient motor startup. System superheat and subcooling should also be carefully verified according to the 22.2 K reference condition to maintain optimal performance. Since this compressor operates on an on-off cycle, it performs best in systems equipped with a properly adjusted thermostat or controller to ensure stable cycling and prevent unnecessary stress on the unit.
