COPELAND RST37C1U-CAA-901 Compressor Start Kit RST37C1U-C4A-901 115V R290 1PH

( Brand: Copeland ), ( Manufacturer Part Number: RST37C1U-CAA-901 ), ( Part Type: Start Compressor ), ( Unit Type: Unit ), ( Manufacturer Warranty: 1 Year ), ( Color: Black ), ( Voltage: 115 V ), ( Material: Steel ), ( Power Phase: 1 Phase )

Review COPELAND New Compressor 115v 1ph Start Kit

The **Copeland RST37C1U-CAA-901 (and RST37C1U-C4A-901) 115V, R290, Single-Phase Start Kit** is a high-performance, energy-efficient refrigeration compressor designed for commercial and industrial applications where reliability, precision cooling, and environmental responsibility are paramount. Engineered by Emerson Climate Technologies, this compressor is part of the advanced **RST series**, which combines cutting-edge technology with robust construction to deliver superior performance in a wide range of refrigeration systems, including reach-in refrigerators, display cases, and medium-duty commercial coolers. The **R290 (propane) refrigerant** compatibility of this unit underscores its eco-conscious design, as R290 is a low-GWP (Global Warming Potential) alternative to traditional refrigerants, making it an ideal choice for facilities prioritizing sustainability without compromising efficiency.

At the heart of this compressor is a **hermetic, scroll-type design**, which ensures smooth, vibration-free operation while maximizing energy efficiency through precise refrigerant compression. The **115V single-phase start kit** (RST37C1U-CAA-901 for standard applications and RST37C1U-C4A-901 for applications requiring a different control configuration) is engineered for seamless integration into existing or new refrigeration systems, offering flexibility for installers and technicians. The **901 designation** indicates a specific model variant optimized for **low-temperature applications**, making it well-suited for systems requiring precise temperature control, such as walk-in coolers, frozen food storage, or high-ambient environments where traditional compressors may struggle. With a **displacement of 37 cubic inches**, this compressor strikes an ideal balance between cooling capacity and energy consumption, delivering consistent performance while minimizing operational costs.

One of the standout features of the Copeland RST37 series is its **adaptive electronic control system**, which dynamically adjusts compressor operation based on real-time demand, reducing energy waste and extending the lifespan of the system. The **R290 refrigerant** not only aligns with environmental regulations but also enhances heat transfer efficiency, allowing the compressor to achieve faster cooling cycles and maintain optimal temperatures with greater stability. Additionally, the **sealed, hermetic construction** eliminates the need for lubricant changes or routine maintenance, reducing downtime and labor costs while ensuring long-term reliability. The **single-phase start kit** simplifies installation, particularly in locations where three-phase power may not be available, making it a versatile solution for a broad range of commercial refrigeration setups.

Built to endure the rigors of continuous operation, the Copeland RST37C1U-CAA-901 and RST37C1U-C4A-901 compressors feature **high-quality materials and precision engineering**, including a **cast-iron cylinder block** for durability and a **stainless steel crankshaft** to resist wear and corrosion. The **integrated thermal protection** and **overload safeguards** provide an extra layer of operational security, preventing damage from overheating or electrical surges. Whether deployed in a high-volume restaurant, a retail grocery store, or an industrial processing facility, this compressor delivers **quiet, efficient, and dependable cooling**, making it a cornerstone of modern refrigeration infrastructure. With its focus on **energy savings, environmental responsibility, and operational longevity**, the Copeland RST37 series stands as a testament to Emerson s commitment to innovation in climate control technology.

### **Pros and Cons of buying a Copeland RST37C1U-CAA-901 / RST37C1U-C4A-901 (115V, R290, 1-Phase) Start Kit**

#### **Pros**

1. **Energy Efficiency and Environmental Friendliness**

- The unit uses **R290 (propane)**, a natural refrigerant with a **Global Warming Potential (GWP) of 3**, making it significantly more eco-friendly than traditional HFC refrigerants (e.g., R-410A, which has a GWP of 2,088).

- Lower operating costs due to higher efficiency compared to older refrigerant-based systems.

2. **Reliability and Durability**

- Copeland is a well-established brand known for **high-quality, long-lasting compressors**, particularly in commercial and industrial refrigeration applications.

- The **RST series** is designed for **high-duty cycles**, making it suitable for continuous operation in applications like reach-in refrigerators, display cases, or small walk-in coolers.

- **1-phase start kit** ensures compatibility with standard electrical setups, reducing installation complexity.

3. **Compatibility and Flexibility**

- The **RST37C1U** model is a **hermetic compressor**, meaning it is factory-sealed and requires minimal maintenance, reducing the risk of leaks and contamination.

- The **901 series** is often used in **low-temperature applications** (down to **-30 C / -22 F**), making it versatile for various refrigeration needs.

- The **start kit** (likely including a capacitor, relay, and wiring components) simplifies installation for DIY or professional setups.

4. **Cost-Effective for Small-Scale Applications**

- While the upfront cost may be higher than older refrigerant-based units, the **long-term energy savings and lower environmental impact** can justify the investment.

- Suitable for **small businesses, restaurants, or retail stores** looking to upgrade to a more efficient system.

5. **Future-Proofing**

- Many regions are phasing out high-GWP refrigerants, and **R290 is a compliant, future-ready choice** that avoids potential regulatory penalties or retrofit costs.

- The **1-phase design** is simpler to integrate into existing electrical systems compared to 3-phase units.

---

#### **Cons**

1. **Higher Upfront Cost**

- R290-based systems are generally **more expensive** than traditional HFC-based units due to refrigerant costs, certification requirements, and specialized handling.

- The **start kit** may require additional components (e.g., oil, refrigerant, or specialized tools), increasing initial expenses.

2. **Specialized Handling and Safety Requirements**

- **Strict installation codes** (e.g., NFPA 704, ASHRAE standards) must be followed.

- **Certified technicians** may be required for installation and servicing.

- **Leak detection and containment** measures are necessary, adding complexity.

- Unlike HFCs, **R290 cannot be vented** it must be recovered and recycled, increasing disposal costs.

3. **Limited Availability of Service Support**

- Not all HVAC/R technicians are familiar with **R290 systems**, which could lead to **higher service costs** or delays in repairs.

- Spare parts and refrigerant may be **less readily available** than for more common refrigerants.

4. **Potential for Higher Maintenance Costs**

- While Copeland compressors are durable, **R290 systems may require more frequent checks** for leaks, oil condition, and refrigerant charge due to the refrigerant s properties.

- **Oil compatibility** must be carefully managed some R290 systems use **POE (polyol ester) oil**, which can degrade if mixed with mineral oil from older systems.

5. **Space and Installation Constraints**

- R290 systems often require **proper ventilation and clearance** due to flammability concerns, which may limit installation flexibility in tight spaces.

- Some **building codes or insurance providers** may impose restrictions on R290 use, requiring additional permits or inspections.

6. **Learning Curve for Installation**

- If you or your installer are unfamiliar with **R290 systems**, there may be a **steep learning curve** in handling refrigerant charging, leak detection, and system startup.

- The **start kit** may require additional troubleshooting if components (e.g., capacitor, relay) are not properly matched to the compressor.

---

### **Conclusion**

The **Copeland RST37C1U-CAA-901 / RST37C1U-C4A-901 (R290, 115V, 1-phase) start kit** is an **excellent choice for applications requiring high efficiency, environmental compliance, and long-term reliability**. It is particularly well-suited for:

- **Small to medium commercial refrigeration** (e.g., restaurants, retail coolers, laboratories).

- **Applications where energy savings and low GWP are priorities**.

- **Installations where 1-phase power is available and proper safety protocols can be followed**.

- **Budget-conscious buyers** who cannot justify the initial investment.

- **DIY installers** without proper training in R290 systems.

- **Applications where flammability concerns cannot be addressed** (e.g., high-occupancy areas without proper ventilation).

### **Recommendation**

You are replacing an older, inefficient HFC-based system and want to **reduce energy costs and environmental impact**.

You have **access to a certified technician** for installation and servicing.

Your application is **commercial or industrial refrigeration** where reliability and efficiency are critical.

You can **comply with local building codes and safety regulations** for R290 systems.

You are on a **tight budget** and cannot afford the higher upfront cost.

You lack **experience with R290 refrigerants** and cannot hire a qualified installer.

Your **electrical setup or space constraints** make compliance difficult.

You are in a **region with restrictive R290 regulations** or insurance requirements.

For the right application, this is a **superior, future-proof choice** that offers **long-term savings and sustainability benefits**. However, it requires **proper planning, compliance with safety standards, and access to specialized service** to ensure optimal performance. If these factors align with your needs, the **Copeland RST37C1U with R290 is a strong recommendation**. Otherwise, consider alternatives like **R-454B (low-GWP HFO) or R-134a** if R290 is not feasible.

Details:

Designed for R290 systems only. Copeland Compressor NEW Sealed. All components have been visually inspected for quality and completeness prior to listing. Start Components Kit capacitors relay pre-installed in housing.

Brand: Copeland Emerson, model: RST37C1U, Part Number: RST37C1U-C4A-901, voltage : 115V, Phase: 1PH, Frequency: 60Hz, Refrigerant: R290 Hydrocarbon, Oil Type: POE, condition: NEW, Factory-sealed process tubes intact unit remains pressurized never installed.

part #: rst37c1ucaa901 prices

• $289.95-$680.00

specifications motohva:

• brand: Copeland
• mpn: Rst37c1u-caa-901
• part type: Start Compressor
• unit type: Unit
• manufacturer warranty: 1 Year
• color: Black
• voltage: 115 V
• material: Steel
• power phase: 1 Phase

returns motohva:

• policy: No Returns

offer motohva:

• availability: In Stock
• started: March 31, 2026
• options: Ship-to-home
• best offers: True
• sold: 0
• quantity: 1

seller motohva:

• rating: 100.0%
• city: Pompano Beach, Florida
• # reviews: 67

general motohva:

• HVAC Refrigeration > HVAC Refrigeration Components > Compressors
• condition: New Open box

payments motohva:

• other
• credit card: Visa
• wallet: Apple-pay

shipping motohva:

• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• type: Calculated
• transit: 4-8 Days
• cost: $0.00

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