Chillers are essential components in HVAC and industrial cooling systems, and one of the most critical safety and performance elements within them are chiller pressure switches. These switches help protect the system from overpressure or underpressure, ensuring smooth and safe operation.

In this blog, we’ll explore the most commonly used chiller pressure switches — including the HP switch 0–14 bar for chiller, the LP switch 0–16 BAR for chiller, and the pressure switch KP-35 – KP-36 for chiller — and explain how each type contributes to efficient chiller operation.

What Are Chiller Pressure Switches?

Chiller pressure switches are electromechanical devices used to monitor refrigerant pressure in the system. They trigger protective responses when the pressure reaches critical high or low limits, helping to prevent equipment damage and maintain safe performance.

There are two main types of pressure switches used in chillers:

• HP (High Pressure) Switches

• LP (Low Pressure) Switches

Each serves a distinct purpose in maintaining the balance of the refrigeration cycle.

HP Switch 0–14 Bar for Chiller

The HP switch 0–14 bar for chiller is a high-pressure safety switch designed to monitor and control the maximum allowable pressure in the system. If the refrigerant pressure exceeds a safe limit (typically up to 14 bar), the HP switch automatically shuts off the compressor to prevent system failure.

Key Features:

• Operating range: 0–14 bar

• Prevents damage from high refrigerant pressure

• Commonly installed near the compressor outlet

Why It Matters:
HP switches play a vital role in preventing overheating, compressor overload, and potential system blowouts due to high pressure buildup.

LP Switch 0–16 BAR for Chiller

Contrary to the high-pressure switch, the LP switch 0–16 BAR for chiller ensures that pressure does not drop below safe operating levels. Low pressure can indicate refrigerant leaks, system inefficiencies, or evaporator issues.

Key Features:

• Operating range: 0–16 bar

• Shuts down system during underpressure conditions

• Helps detect refrigerant loss early

Why It Matters:
Maintaining the correct low-side pressure is essential for the chiller’s cooling performance and energy efficiency.

Pressure Switch KP-35 – KP-36 for Chiller

The KP-35 and KP-36 pressure switches are versatile models widely used in chiller systems for both high- and low-pressure applications. These switches are manufactured for reliability, fast response times, and durability.

KP-35:

• Typically used as a low-pressure cut-out

• Suitable for R134a, R22, and other refrigerants

• Adjustable range, compact design

KP-36:

• Often used as a high-pressure cut-out

• Ideal for air conditioning and refrigeration systems

• Manual or automatic reset options

Why Choose KP-35/KP-36 for Chillers?

• Long operational life

• High switching accuracy

• Easy to install and service

These switches are commonly preferred by OEMs and service engineers due to their reliability and compatibility with various refrigerants.

Choosing the Right Chiller Pressure Switch

When selecting a pressure switch for your chiller, consider:

• Required pressure range (0–14 bar for HP, 0–16 bar for LP)

• Type of refrigerant used

• Reset method (manual or automatic)

• Durability and brand reliability

Matching the right switch — whether HP switch 0–14 bar, LP switch 0–16 BAR, or a KP-35/KP-36 pressure switch — ensures safety, energy efficiency, and prolonged equipment life.

Conclusion

Understanding and selecting the correct chiller pressure switches is crucial for the optimal performance and safety of your HVAC or industrial cooling system. Whether you need an HP switch 0–14 bar, an LP switch 0–16 BAR, or a pressure switch KP-35 – KP-36, choosing the right model will protect your equipment and ensure smooth operation.

Need help selecting the right pressure switch?
Contact our team for expert guidance and top-quality components for your chiller system.