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Chiller Piping Connection Explained Step-by-Step

Chiller Piping Connection Explained Step-by-Step


Understanding the sequence of chilled water piping components is essential for every HVAC engineer and site professional.

Each component has a specific function that ensures smooth water flow, system protection, and energy efficiency.


1 Isolation Valve

The first component is the Isolation Valve.

It is used to isolate equipment during maintenance or repair without shutting down the entire system.

  • Prevents complete system drainage
  • Improves operational flexibility


2 Strainer

The Strainer removes dirt, rust particles, and debris from the chilled water line before the water reaches sensitive equipment.

  • Protects pumps and chillers
  • Prevents blockage inside heat exchangers


3 Flow Switch

The Flow Switch checks whether water is flowing properly inside the pipeline before the chiller starts operating.

  • Prevents evaporator freezing
  • Protects equipment from dry operation


4 CHW Pump

The Chilled Water Pump (CHW Pump) circulates chilled water throughout the entire HVAC system.

  • Maintains required water flow
  • Transfers cooling from chiller to AHUS/FCUs


5 NRV (Check Valve)

The Non-Return Valve (NRV) or Check Valve prevents reverse water flow inside the piping system.

  • Prevents backflow
  • Protects pumps from reverse rotation


6 Balancing Valve

The Balancing Valve controls and balances water flow in the system according to design requirements.

  • Ensures equal water distribution
  • Prevents over-flow or under-flow


7 Supply Header

The Supply Header distributes chilled water from the chiller plant to different AHUs and FCUs in the building.

  • Central distribution point
  • Maintains organized piping network


8 AHU/FCU Connection

The chilled water enters the AHU (Air Handling Unit) or FCU (Fan Coil Unit) where heat exchange takes place.

  • Removes heat from indoor air
  • Provides cooling to occupied spaces
  • Main air-conditioning terminal units


9 Return Header

After absorbing heat from the building, the water returns through the Return Header back to the chiller.

  • Collects return water from all zones
  • Sends warm water back for re-cooling
  • Completes the chilled water cycle


10 DP Sensor

The Differential Pressure (DP) Sensor monitors pressure difference in the system and controls pump operation, especially in VFD systems.

  • Maintains required pressure
  • Save energy
  • Optimizes pump speed automatically


11 Isolation Valve

Another Isolation Valve is installed at the return side for easy servicing and maintenance of equipment.

  • Allows equipment shutdown without affecting the whole system


Proper piping arrangement is the backbone of an efficient chiller plant.

A well-designed chilled water system improves performance, reduces energy consumption, and increases equipment life.





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