High-Pressure Alarm Analysis (Water-Cooled Chiller)

In water-cooled chiller systems, a high-pressure alarm (HP trip) is almost always triggered by issues within the cooling water circuit, specifically due to insufficient water flow or poor heat dissipation.

Below are the primary causes behind this issue:

Insufficient Water Flow Rate:

A malfunctioning cooling water pump, clogged pipes, or partially closed valves reduce the volume of water circulating through the condenser, preventing proper heat transfer.

Clogged Y-Strainer / Filter:

Debris, sand, or rust trapped inside the Y-strainer restricts the water flow significantly, leading to an immediate pressure spike in the system.

Severe Condenser / Cooling Tower Scaling:

High mineral content in the water causes scaling inside the condenser tubes and cooling tower fillers. This scale acts as a thermal barrier, drastically reducing cooling efficiency and driving up system pressure.

Cooling Tower Fan Failure:

If the cooling tower fan or its drive belt breaks or slips, the tower cannot lower the water temperature. Entering the condenser with overheated water causes a rapid high-pressure alarm.

Low Water Level in the Cooling Tower Basin:

An inadequate water volume or a faulty float valve introduces air into the piping network, causing air locks and disrupting steady water circulation.