8.49 EUR
NRF 38903 Pressure Switch, air conditioning
A compact pressure switch designed for HVAC systems, it monitors refrigerant pressure and triggers safety cut‑off when thresholds are exceeded, ensuring reliable operation and protecting the compressor from damage
Stores where to buy this product
Trodo EU
NRF 38903 Pressure Switch for Air Conditioning
The NRF 38903 Pressure Switch is a precision component engineered to monitor and regulate the pressure within an air conditioning system. Designed with durability and reliability in mind, this switch ensures optimal performance of HVAC units by providing accurate pressure feedback to control circuits.
Key Functionalities
- Pressure Sensing: Detects both low and high pressure conditions within the refrigerant circuit.
- Signal Output: Generates a clear electrical signal to trigger compressor start/stop or safety shutdown.
- Wide Operating Range: Suitable for most automotive and commercial air conditioning systems, including BMW Series 3 models.
- Fast Response Time: Immediate detection of pressure changes minimizes system downtime.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | NRF 38903 |
| Application | Air conditioning pressure monitoring |
| Operating Temperature Range | -40°C to +85°C (standard automotive range) |
| Signal Type | Digital output (normally open/closed) |
| Installation Compatibility | Fits standard pressure sensor housings; easy to retrofit in existing systems. |
Design Features
The switch incorporates a robust housing that protects internal components from moisture, vibration, and temperature extremes. Its sealed construction prevents contamination of the sensing element, ensuring long-term accuracy. The mounting flange is engineered for quick attachment to pressure lines without the need for extensive modifications.
Installation Guidelines
- Disconnect Power: Ensure the air conditioning system is powered off before any work.
- Locate Pressure Line: Identify the appropriate pressure line (high or low side) for sensor placement.
- Remove Existing Sensor: Carefully detach the old pressure switch, noting orientation and wiring.
- Mount NRF 38903: Secure the new switch onto the flange using provided fasteners; verify a tight seal.
- Wire Connections: Connect the output leads to the control circuit as per manufacturer’s schematic.
- Test Operation: Re‑energize the system and monitor the switch’s response to pressure changes.
Maintenance Tips
- Inspect for physical damage or corrosion every six months.
- Clean external surfaces with a dry cloth; avoid abrasive cleaners that could scratch the housing.
- Verify signal integrity using a multimeter or diagnostic tool during routine service checks.
Compatibility Highlights
The NRF 38903 is specifically engineered to integrate seamlessly with a variety of air conditioning systems, including:
- BMW Series 3 models – ensuring precise pressure monitoring for optimal cabin comfort.
- Commercial HVAC units – providing reliable pressure feedback in larger refrigeration loops.
- Automotive aftermarket installations – easy to retrofit into existing setups without major modifications.
Performance Benefits
By accurately detecting pressure thresholds, the NRF 38903 protects compressors from over‑pressure and under‑pressure conditions. This proactive monitoring reduces wear, extends component life, and enhances overall system efficiency. Additionally, its quick response time helps maintain consistent cooling performance during variable load scenarios.
Conclusion
The NRF 38903 Pressure Switch is a critical element for any air conditioning system that demands reliable pressure monitoring and control. Its robust construction, precise sensing capabilities, and straightforward installation make it an ideal choice for automotive and commercial HVAC applications alike.
| This product in Comparor | |
|---|---|
|
Category
This product is cataloged in our store in these categories
|
|
|
International
Find this product in one of our international stores
|
 15.31 EUR  7.91 EUR  50.95 EUR |
| Colors
Predominant colors of the product |
|
| Identifiers | |
| Brand |  NRF is a brand that specializes in creating and selling clothing and accessories for women. The brand is known for its contemporary and stylish designs, as well as its high-quality materials. NRF is a popular choice for women who want to look stylish and fashionable, without spending a lot of money. |
| Model | NRF 38903 |
| MPN | NRF 38903 |
| ID | 7019702 |
| Dimensions / Weight | |
| Key Features | |
Related articles
