As HVAC systems continue to advance, pressure control components are expected to provide stable and repeatable performance under varying operating conditions. PTS staging valves are designed to regulate pressure transitions with accuracy, supporting efficient staging in multi-capacity chillers and heat pumps. Their application enables precise load alignment and consistent system response. A focused resource included within the discussion outlines essential selection criteria, performance attributes, and practical application considerations. With this understanding, professionals can confidently design, optimize, or upgrade HVAC systems that depend on accurate pressure control to achieve reliable and efficient operation.

Basic Concepts of Chiller Operation & Automation

• Air-Cooled Chiller

A machine that makes cold water using fans and outdoor air to remove heat.

• Centrifugal Water-Cooled Chiller

A large chiller that uses spinning wheels (centrifugal force) and cooling water to remove heat. Good for big buildings.

• Screw Water-Cooled Chiller

A chiller that uses two rotating screws to compress refrigerant and cool water. Strong and efficient for medium to large-sized buildings.

• Cooling Tower

A system that throws heat into the air by using water and fans. It helps water-cooled chillers stay cool.

• Chilled Water Pump

A pump that moves the cold water around the building to cool rooms and equipment.

• Condenser Water Pump

A pump that moves warm water between the chiller and the cooling tower so heat can be removed.

• Plate Heat Exchanger

A device with thin metal plates that transfers heat between two water systems without mixing them.

• Controller, VFD…

Electronics that control the system:

Controller: The “brain” that tells equipment when to start/stop.

VFD (Variable Frequency Drive): Controls motor speed to save energy.

• AHU, PAU…

Air systems inside a building:

AHU (Air Handling Unit): Pushes cool air into rooms.

PAU (Pre-Air Unit / Primary Air Unit): Treats and supplies fresh outdoor air into the building.

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Air Cooled Chillers

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