034G2603 Danfoss ETS 250 Electric Expansion Valve

Product Overview

The 034G2603 (034G2603) is a high-capacity ETS 250 series electric expansion valve designed for precise liquid injection in large-scale refrigeration and air conditioning systems. Engineered for high-resolution flow control, the 034G2603 utilizes a sophisticated bipolar stepper motor to provide accurate refrigerant metering, ensuring optimal evaporator utilization and stable superheat control. This straightway valve is built with a balanced design that allows for bi-directional flow, making it an ideal solution for heat pump systems and high-tonnage chillers. With its copper solder ODF connections and an IP67-rated M12 electrical interface, this valve offers the durability and sealing integrity required for the most demanding industrial cooling environments.

Technical Configuration

The 034G2603 features a robust mechanical and electrical architecture for advanced system integration:

• High-Resolution Stepper Actuator: The ETS 250 series provides 3810 steps of resolution, allowing for extremely fine adjustments in refrigerant flow to maintain peak system efficiency under varying loads.

• Balanced Internal Orifice: The balanced design ensures that the valve performance remains independent of the pressure drop across the valve, providing stable regulation even at high differential pressures.

• Standardized Connectivity: Equipped with a 4-pin M12 male electrical connector, ensuring a secure, waterproof (IP67) connection that is compatible with Danfoss EKD and universal EEV controllers.

• Copper Solder ODF Connections: Features high-quality copper ends to facilitate standard brazing procedures, ensuring leak-free integration into the primary liquid line.

Technical Specifications

Technical FAQs

Can the ETS 250 be used in heat pump applications?

Yes. The 034G2603 features a balanced design that supports bi-flow operation. This allows the valve to regulate refrigerant flow in both heating and cooling cycles with the same precision and capacity, eliminating the need for check valve bypass loops in many heat pump architectures.

What happens to the valve position during a power failure?

The ETS 250 is a stepper-motor-driven valve and will remain in its last position if power is lost. For safety in critical systems, it is recommended to use a controller equipped with a battery backup (UPS) or a capacitor module to force the valve to the closed position upon power loss.

Is there a specific orientation required for the M12 connector?

The M12 connector is keyed to ensure correct alignment. However, for environmental protection, it is best practice to install the valve such that the cable enters from below or from the side to prevent moisture from pooling around the connector pins.

Engineering & Installation Guide

• Brazing Safeguards: During installation, the valve body must be kept cool. Wrap the valve housing in a wet cloth and ensure the flame is directed away from the actuator assembly. The internal motor and seals are sensitive to temperatures exceeding 120 Celsius; failure to protect the valve during brazing will cause permanent internal damage.

• Controller Programming: Ensure your controller is programmed for the specific step rate and total steps (3810) of the ETS 250. An incorrect "steps per second" setting can lead to missed steps or motor stalls, resulting in erratic superheat and potential compressor damage.

• Moisture Management: While the electrical connection is rated IP67, ensure that the M12 cable is properly seated and the locking nut is hand-tightened. In low-temperature applications, ensure that the valve and actuator are adequately insulated to prevent excessive ice buildup, which can put mechanical stress on the electrical cable.