Technical Review: Danfoss SECOP 117U6015 Refrigerator Freezer Coil Start Relay - Selection Guide & Specs
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Overview: Solving Compressor Start Failures in Refrigeration Systems
The Danfoss SECOP 117U6015 Refrigerator Freezer Coil Start Relay addresses one of the most common failure points in commercial and residential refrigeration systems: compressor startup issues. When compressors fail to start properly, it leads to temperature fluctuations, food spoilage, and costly emergency repairs. This current-type start relay provides the critical electrical switching needed to initiate compressor operation by managing the high inrush current during startup, preventing motor damage and ensuring reliable cooling system performance.
Technical Specifications Analysis
The 117U6015 is engineered specifically for High Starting Torque (HST) applications, making it ideal for compressors that require significant initial torque to overcome system pressure. Unlike standard Relays, this current-sensing relay monitors the run winding current to determine when to engage and disengage the start winding circuit.
| Specification | Value | Description |
|---|---|---|
| Model Number | 117U6015 | Danfoss SECOP OEM Part Number |
| Relay Type | Current Sensing Start Relay | Monitors run winding current for switching |
| Maximum Pickup Current | 4.40 A | Current at which relay engages start winding |
| Minimum Dropout Current | 3.20 A | Current at which relay disengages start winding |
| Nominal Dropout Current | 3.55 A | Typical operating dropout threshold |
| Voltage Compatibility | 110-240 V AC | Works with both 110V and 240V systems |
| Weight | Approximately 28g | Lightweight design for easy installation |
| Application | High Starting Torque (HST) | For compressors requiring significant startup torque |
| Compatibility | Danfoss/SECOP Compressors | Specifically designed for Danfoss refrigeration systems |
This relay operates on a simple yet effective principle: when the compressor starts, high current flows through the run winding, creating a magnetic field that closes the relay contacts to engage the start winding. As the compressor reaches operating speed, current decreases, causing the relay to open and disconnect the start winding. This sequential operation prevents the start winding from remaining energized during normal operation, which could lead to overheating and failure.
Buying Considerations: Selection Guide for Refrigeration Professionals
When selecting the Danfoss SECOP 117U6015 start relay, consider these critical factors:
1. Compressor Compatibility Verification: Before purchasing, verify that your compressor requires a current-type start relay (not a PTC or potential relay). This model is specifically designed for Danfoss/SECOP compressors used in wine coolers, beverage refrigerators, and commercial refrigeration units.
2. Electrical System Matching: Ensure your system voltage matches the relay's 110-240V AC compatibility. While the relay handles both voltages, improper voltage matching can affect performance and longevity.
3. Current Rating Assessment: Check your compressor's startup current requirements. The 117U6015's 4.40A maximum pickup current makes it suitable for compressors with moderate to high starting current demands.
4. Installation Environment: Consider the operating environment - this relay is designed for standard refrigeration applications, not extreme temperature or moisture conditions without proper protection.
5. Diagnostic Testing: Before replacement, test your existing relay using a multimeter to confirm it's the failed component. Common symptoms include compressor humming but not starting, intermittent cooling, or complete system failure.
6. OEM vs. Aftermarket: The 117U6015 is an OEM Danfoss part, ensuring perfect compatibility and reliability. When purchasing from Refrigeration Parts suppliers, verify authenticity to avoid counterfeit components.
Frequently Asked Questions
Q1: How do I test if my Danfoss 117U6015 start relay is faulty?
A: To test the relay, first disconnect power to the refrigerator. Use a multimeter to check continuity between the relay terminals. With the relay in its normal position (not energized), there should be continuity between the start winding terminals. When simulating startup current (or using a bench test with appropriate current), the relay should open. No continuity or constant continuity indicates a failed relay.
Q2: Can I use the 117U6015 relay with non-Danfoss compressors?
A: While technically possible if electrical specifications match, we strongly recommend using OEM-specified relays for each compressor brand. Different manufacturers use varying current thresholds, coil designs, and switching characteristics. Using incompatible relays can lead to premature compressor failure or inefficient operation. Always consult the compressor manufacturer's specifications or a qualified refrigeration technician.
Q3: What are the common symptoms of a failing start relay in refrigeration systems?
A: The most common symptoms include: 1) Compressor humming but not starting (often accompanied by a clicking sound), 2) Intermittent cooling or temperature fluctuations, 3) Circuit breaker tripping when the compressor tries to start, 4) Compressor running but not achieving proper cooling capacity, and 5) Visible damage or burning smell from the relay component. If you experience any of these issues with your Refrigeration Systems, the start relay should be one of the first components checked.
