DANFOSS 174L0351 Vlt Hvac Drive Vfd Bypass 15HP 11KW 460V 3-PHASE

( Brand: Danfoss ), ( Manufacturer Part Number: 174L0351 ), ( Part Type: Hvac Drive ), ( Power Rating: 11 Kw ), ( Bypass: With Bypass ), ( Input Voltage: 460 V ), ( Enclosure: Chassis ), ( Number Of Phases: 3-phase ), ( Rated Load: 15 Hp )

Review DANFOSS Vlt Hvac Drive Vfd 15hp 11kw 460v 3-phase Bypass

The **Danfoss VLT HVAC Drive (Model 174L0351)** is a high-performance, energy-efficient variable frequency drive (VFD) meticulously engineered to optimize the operation of HVAC systems, pumps, fans, and other three-phase induction motors in commercial, industrial, and institutional applications. Designed with Danfoss s renowned precision and reliability, this compact yet robust drive delivers seamless motor control while significantly reducing energy consumption, operational costs, and mechanical stress on connected equipment. Operating at a nominal power rating of **15 horsepower (11 kilowatts)** and configured for **460V three-phase AC input**, the 174L0351 integrates a **bypass contactor** a critical feature for emergency or maintenance scenarios ensuring uninterrupted system functionality even during drive failures. Its advanced **vector control technology** provides superior torque response, smooth acceleration, and precise speed regulation, making it ideal for applications requiring fine-tuned HVAC control, such as chillers, air handlers, rooftop units (RTUs), and water pumps. The drive s **IP20 protection rating** ensures durability in standard indoor environments, while its **compact, modular design** allows for easy installation in tight spaces, reducing installation complexity and footprint. With built-in **energy-saving features**, including soft-start and soft-stop capabilities, the 174L0351 minimizes inrush current and mechanical wear, extending the lifespan of both the motor and driven equipment. Additionally, its **user-friendly interface** featuring a clear LCD display and intuitive keypad simplifies setup, monitoring, and troubleshooting, enabling operators to optimize performance with minimal training. Compatible with Danfoss s **VLT AutomationDrive** software suite, this drive supports advanced diagnostics, remote monitoring, and integration with building management systems (BMS), enhancing overall system efficiency and operational visibility. Whether deployed in a large commercial building, industrial facility, or data center, the **Danfoss VLT HVAC Drive 174L0351** stands as a cornerstone of modern, energy-conscious HVAC automation, delivering unmatched performance, reliability, and cost savings.

### **Pros and Cons of buying a Danfoss 174L0351 VLT HVAC Drive (15HP / 11kW, 460V, 3-Phase, Bypass)**

#### **Pros**

1. **High Efficiency and Energy Savings**

The Danfoss VLT HVAC drive is designed for variable frequency control, allowing precise speed adjustment of motors in HVAC systems. This reduces energy consumption by matching motor speed to actual load requirements, leading to significant cost savings over time.

2. **Reliable and Durable Construction**

Danfoss is a well-established brand known for manufacturing high-quality industrial drives. The 174L0351 is built with robust components, including a bypass feature that ensures continuous operation even if the drive fails, preventing system downtime.

3. **Wide Voltage and Frequency Range**

The drive operates at **460V, 3-phase**, making it suitable for standard industrial HVAC applications. Its ability to handle variable frequencies ensures compatibility with different motor types and system demands.

4. **Advanced Control Features**

The drive includes features such as **soft start/stop, overload protection, and programmable parameters**, allowing for optimized motor control and extended equipment lifespan. It also supports **remote monitoring and diagnostics**, simplifying maintenance.

5. **Compatibility with HVAC Systems**

Specifically designed for HVAC applications, this drive is optimized for fans, pumps, and compressors, ensuring smooth operation in heating, ventilation, and air conditioning systems.

6. **Long Warranty and Support**

Danfoss products typically come with **extended warranties (often 1-2 years)**, and the company provides strong technical support, reducing long-term maintenance concerns.

7. **Reduced Mechanical Stress**

By controlling motor speed, the drive minimizes wear and tear on belts, bearings, and other mechanical components, leading to lower maintenance costs.

8. **Scalability and Future-Proofing**

The drive supports **modbus, profibus, and other communication protocols**, allowing for easy integration with building automation systems (BAS) and future upgrades.

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#### **Cons**

1. **High Upfront Cost**

Danfoss drives are premium products, and the **174L0351 is no exception**, with a higher initial purchase price compared to generic or lower-end brands. This may be a barrier for small businesses or budget-conscious buyers.

2. **Complex Installation and Configuration**

While the drive is user-friendly, proper installation requires **technical expertise**, especially when integrating with existing HVAC systems. Misconfiguration can lead to inefficiencies or system failures.

3. **Dependence on Power Supply Stability**

Like all VFDs, the drive is sensitive to **voltage fluctuations and poor power quality**. In facilities with unstable electrical grids, additional **power conditioning equipment** may be needed, increasing system costs.

4. **Limited Availability of Spare Parts**

While Danfoss has a strong reputation, **spare parts availability can be an issue in remote locations**, potentially causing delays in repairs.

5. **Learning Curve for Maintenance**

Operators and technicians may require **training** to fully utilize the drive s advanced features, which could add to training costs.

6. **Potential for Overkill in Small Systems**

If the HVAC system is **small or operates at constant load**, a VFD may not provide significant energy savings, making the investment less justified.

7. **Noise and EMI Considerations**

VFDs can generate **electromagnetic interference (EMI)**, which may require additional shielding in sensitive environments. Some users also report **higher operational noise** compared to direct-on-line motors.

8. **Bypass Feature Limitations**

While the bypass ensures continuous operation, it **does not address the root cause of failure** meaning the drive will still need replacement, and the bypass may not be as efficient as the main drive.

---

### **Conclusion**

The **Danfoss 174L0351 VLT HVAC Drive** is a **high-performance, energy-efficient solution** ideal for large-scale HVAC systems where **variable speed control, reliability, and long-term cost savings** are priorities. Its **robust construction, advanced features, and compatibility with automation systems** make it a strong choice for industrial and commercial applications.

However, the **high cost, installation complexity, and dependency on stable power supply** may pose challenges for smaller operations or facilities with limited technical resources. If **energy efficiency and system longevity** are the main concerns, this drive is a **reliable investment**. If budget constraints or simplicity are critical, a **lower-cost alternative** (though potentially less efficient) might be considered.

### **Recommendation**

- You operate a **large HVAC system** where energy savings and motor protection are critical.

- You have **technical expertise** or are willing to invest in training for installation and maintenance.

- Your facility has **stable electrical infrastructure** or can accommodate power conditioning.

- Long-term **cost efficiency and reliability** outweigh the higher upfront cost.

- Your system is **small or operates at constant load**, making a VFD unnecessary.

- Budget is a **major constraint**, and you can find a **reputable mid-range drive** with similar efficiency.

- Your team lacks **technical skills** for proper installation and troubleshooting.

For most **commercial or industrial HVAC applications**, the **Danfoss 174L0351 is a well-justified purchase** due to its **proven performance, durability, and energy-saving benefits**. However, always conduct a **cost-benefit analysis** based on your specific system requirements before making a decision.

Details:

Danfoss VLT HVAC Drive VFD 15HP 11kW 460V 3-Phase w/ Bypass 174L0351.

part #: 174l0351 price

• $308.00

specifications variablfrequen:

• brand: Danfoss
• mpn: 174l0351
• part type: Hvac Drive
• power rating: 11 Kw
• bypass: With Bypass
• input voltage: 460 V
• enclosure: Chassis
• number of phases: 3-phase
• rated load: 15 Hp

seller variablfrequen:

• city: Johnston, Rhode Island
• # reviews: 0
• rating: 0.0%

returns variablfrequen:

• policy: No Returns

offer variablfrequen:

• availability: In Stock
• options: Ship-to-home
• best offers: True
• quantity: 1
• sold: 0
• started: May 22, 2026

payments variablfrequen:

• wallet: Google-pay
• other
• credit card: Diners-club

general variablfrequen:

• condition: Used
• Drives Starters > Drives Motor Controls > Variable Frequency Drives

shipping variablfrequen:

• type: Calculated
• cost: $141.12
• class: Standard
• transit: 6-13 Days
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx

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