Why Does a Chiller Show High Pressure and Low Pressure Alarm?
A chiller is a big machine that cools water. This chilled water is used in large buildings, factories, or malls for air conditioning (AC) and cooling.
Why Does High Pressure Alarm Come?
When the gas pressure inside the chiller becomes too high, the system gives a high pressure alarm to protect itself.
Causes of High Pressure:
1. Cooling fan is not working properly (heat is not going out).
2. Low water flow in the condenser.
3. Too much gas filled (overcharged system).
4. Very high ambient temperature (outside heat is too much).
5. Air or dirt inside the gas line (non-condensable gases).
Why Does Low Pressure Alarm Come?
When the gas pressure becomes too low, a low pressure alarm is triggered.
Causes of Low Pressure:
1. Gas leak in the system (refrigerant is low).
2. Compressor not working properly.
3. Expansion valve is blocked or not opening.
4. Cooling load is very low.
5. Any blockage or restriction in the pipe.
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Which Gas (Refrigerant) Is Used in Chillers?
The type of gas depends on the model and design of the chiller. Here are some commonly used gases:
Gas Name
Where It's Used
R-134a
Most commercial chillers
R-410A
Modern AC and chillers.
R-407C
Older systems (replacing R-22)
R-22
Old systems only (now banned in new systems)
> Note: R-22 is harmful to the ozone layer, so it is being phased out. New systems use eco-friendly gases
like R-134a or R-410A.
What to Do When Alarm Comes?
For High Pressure:
Check if the cooling fan is working.
Make sure water flow in the condenser is proper.
If too much gas was added, remove some refrigerant.
Clean the condenser.
Check if the surrounding temperature is too high.
For Low Pressure:
Check for gas leakage.
Refill refrigerant gas to correct level.
Inspect the expansion valve and compressor.
Make sure there is no blockage in the lines.
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