034G1707 Danfoss ETS 50 Electric Expansion Valve

Product Overview

The 034G1707 (034G1707) is a high-precision ETS 50 series electric expansion valve designed for precise liquid injection in air conditioning and refrigeration systems. Engineered to work with electronically controlled controllers, the 034G1707 utilizes a bipolar motor actuator to provide accurate flow regulation across a wide range of evaporation temperatures. Featuring a balanced design and bi-metal (steel/copper) solder connections, this straightway valve ensures optimum system efficiency and compressor protection by maintaining stable superheat. The IP67-rated M12 electrical connection guarantees reliable performance in environments prone to moisture and condensation, making it a staple for high-capacity chillers and commercial heat pump systems.

Technical Configuration

The 034G1707 features a sophisticated mechanical and electrical interface for seamless system integration:

• ETS 50 Series Actuation: Utilizes a precise bipolar stepper motor that translates electrical pulses into linear needle movement, allowing for minute adjustments in refrigerant flow.

• Bi-Metal Solder Connections: The steel/copper ODF solder connections simplify installation by allowing for standard copper-to-copper brazing without the need for specialized flux or welding techniques.

• Straightway Flow Design: The linear internal geometry minimizes pressure drop across the valve while maintaining a balanced orifice for consistent performance regardless of inlet pressure.

• M12 4-Pin Connector: A standardized electrical interface that provides secure, vibration-resistant connectivity, compatible with most universal EEV controllers and Danfoss EKD series drivers.

Technical Specifications

Technical FAQs

Does the ETS 50 valve require a specific orientation for installation?

The 034G1707 is a straightway valve, but for optimum oil return and to prevent liquid slugging at the actuator, the valve should be installed with the motor housing (actuator) pointing upwards. Horizontal installation is permissible but never with the motor pointing downwards.

What is the benefit of the bi-metal connection?

The bi-metal design allows the valve body to be constructed of durable stainless steel while providing copper ends for brazing. This eliminates the risk of overheating the sensitive internal valve components during the soldering process, as copper conducts heat more efficiently for the joint.

Can this valve be used as a solenoid shut-off valve?

While the ETS 50 provides tight shut-off, it is a modulating valve. In systems where safety regulations require a positive mechanical shut-off during power failure, a dedicated solenoid valve should be installed in the liquid line upstream of the 034G1707.

Engineering & Installation Guide

• Brazing Protection: Even with bi-metal connections, it is critical to protect the valve body and the M12 electrical connector from excessive heat. Wrap the valve body in a wet cloth during brazing to ensure the internal motor windings and seals do not exceed 120 Celsius.

• Cable Routing: When connecting the M12 4-pin cable, ensure the cable is routed with a "drip loop" to prevent moisture from entering the connector. Although rated IP67, constant exposure to standing water can lead to pin corrosion over time.

• Controller Calibration: Upon first power-up, ensure the controller performs a "battery backup" or "manual close" sequence to calibrate the zero-point of the stepper motor. The ETS 50 requires 2625 total steps to move from fully closed to fully open; incorrect step calibration will lead to erratic superheat control.