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Product Details:

Product Specification

Brand	Trane
Model	024-2048
P/N	B801020-022A
Type	Phase Protector
Net Weight	0.4 Kg
Country of Origin	Made in ThaiLand

 

Product Description:

Product Video

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I. Introduction: Overview of the TRANE Phase Protection Relay (Phase Protector)

The TRANE phase protection relay is an essential electronic device designed to monitor and protect three-phase HVAC systems from power abnormalities. Its primary function is to act as a protective relay, immediately cutting off power to the protected equipment upon detecting unsafe voltage conditions. This device plays a critical role in maintaining stable operational performance, extending equipment lifespan, and reducing repair costs for large motors and other three-phase equipment typically found in commercial and industrial air conditioning and heating systems.

II. What Is a Phase Protection Relay and Why Is It Necessary?

A phase protection relay, also known as a phase monitoring relay, is a specialized electronic device designed to continuously monitor voltage and current conditions in a three-phase power supply. Its core function is to detect anomalies such as phase loss (one or more phases disconnected), phase reversal (incorrect phase sequence), voltage imbalance (unequal voltage between phases), under-voltage, over-voltage, and sometimes overcurrent.

Phase imbalance occurs when the current in the three phases of the system is not equal. This condition can cause motor overheating, reduced performance, increased energy consumption, and ultimately premature equipment failure. For example, excessively high or low voltage can severely damage circuit boards and motors. Phase reversal can cause motors to rotate in the wrong direction, potentially damaging connected mechanical components.

Installing a phase protection relay provides significant benefits to HVAC systems:

• Equipment Protection: Prevents damage to key HVAC components like three-phase motors and transformers due to phase imbalance and voltage issues.

• Reduced Repair Costs: Immediately disconnecting power when faults are detected helps prevent costly damage. Replacing large motors is often far more expensive than installing a preventive protection device.

• Improved Efficiency and Energy Performance: Phase issues reduce HVAC system efficiency and increase energy costs. The relay minimizes imbalance and boosts energy efficiency.

• Extended Equipment Lifespan: By protecting against adverse voltage conditions, the relay helps extend the operating life of sensitive equipment like motors and transformers, ensuring years of smooth HVAC operation.
  

III. Operating Principle of the TRANE Phase Protection Relay

The TRANE phase protection relay continuously monitors the incoming power supply to the three-phase motor in the HVAC system. It checks for critical parameters like under-voltage, over-voltage, phase loss, phase sequence, and phase imbalance.

The device label clearly shows LED indicators for "Under/Over voltage" and "Phase sequence/Phase loss", confirming its direct monitoring capabilities.

If any fault condition exceeds the allowed threshold, the relay acts as a circuit breaker, instantly disconnecting power to the protected equipment. This rapid action is vital to prevent further damage until the issue can be assessed and resolved by an HVAC technician.

Equipped with LED indicators and potentially alarms, the device provides immediate status feedback, helping to prevent costly downtime. The device in the image shows clear "LED STATUS" and "LED INDICATOR" lights with states like "Normal", "Under/Over voltage", and "Phase sequence/Phase loss". These visual indicators serve a dual function—protection and on-site diagnostics—allowing technicians to quickly identify the fault type and respond accordingly, reducing costly outages.

IV. Application in HVAC Systems

The phase protection relay is typically installed on the incoming three-phase power lines before reaching the motor starter or control units of the HVAC system. This location is crucial as it allows the device to monitor "raw power" and disconnect it immediately when a fault is detected, thus protecting downstream components. Installation must be performed by a licensed electrician or experienced HVAC technician, following all national, state, and local electrical codes. Proper wiring for the phase lines (L1, L2, L3) and neutral (N) according to the wiring diagram is critical.

These relays are often pre-installed in larger industrial equipment, particularly in commercial and industrial HVAC systems. Common applications include:

• Air compressors

• Chillers cooling water for air handlers

• Cooling towers rejecting chiller heat

• Large commercial air handlers

• Circulating water pumps

Specifically, the 024-2048 phase protection relay is listed as a component for Trane models such as TTK036-060, TTKA36-B60, TTKC36-D60, TTKE36-E48, TTA (all models), CGAT (all models), SRUB (all models), and SWUT (all models).

Conclusion

The TRANE phase protection relay (P/N: B801020-022A / Model: 024-2048) is an essential component for protecting three-phase HVAC systems from voltage and phase abnormalities. Acting as a monitoring relay, it continuously checks power conditions and instantly disconnects control circuits upon detecting faults such as phase loss, reversal, under-voltage, over-voltage, or imbalance.

 

Infomation to order the product/Thông tin liên hệ mua sản phẩm: 
HVACR VIET NAM ENGINEERING CO.,LTD/ CÔNG TY TNHH KỸ THUẬT HVACR VIỆT NAM
Address: 331/70/45A Phan Huy Ich Street, Ward 14, Go Vap District, HCM City, Vietnam
Telephone/ Điện thoại: (+84) 327.299.154