The high temperature alarm of the chiller will cause the device to trigger the protection switch to be disconnected and cannot continue to work. When the chiller has a high-pressure alarm, there are the following reasons, which can be dealt with in a targeted manner:

1. The cooling water temperature is too high, and the condensation effect is not good

The rated working condition of the cooling water required by the chiller is 30~35°C. The high water temperature and poor heat dissipation will inevitably lead to high condensation pressure. This phenomenon often occurs in high temperature seasons.

Solution: reduce the water temperature (cooling water allows 21°C-38°C)

2. Insufficient cooling water flow

The cooling water flow rate is insufficient, the rated water flow rate cannot be reached, the pressure difference between the inlet and outlet water of the unit becomes smaller (compared with the pressure difference at the beginning of the system being put into operation), and the temperature difference becomes larger.

Solution: increase the cooling water flow. Install an exhaust valve at a high place in the pipeline for exhaust; the pipeline filter is clogged or too fine, and the water permeability is limited. A suitable filter should be selected and the filter screen should be cleaned regularly; the water pump is selected to be small and does not match the system.

3. Condenser scaling or blockage

Condensed water is generally tap water, which is easy to scale when the temperature is above 30°C, and because the cooling tower is open and directly exposed to the air, dust and foreign matter can easily enter the cooling water system, causing the condenser to be dirty and blocked, and the heat exchange area is small , the efficiency is low, and it also affects the water flow. The performance is that the water pressure difference between the inlet and outlet of the unit and the temperature difference become larger, the temperature of the upper and lower parts of the condenser is very high when touched by hand, and the copper tube of the condenser liquid outlet is hot.

Solution: Clean the condenser copper tube. Regularly backwash the unit, and perform chemical cleaning and descaling if necessary.

4. The refrigerant is mixed with air, nitrogen and other non-condensable gases

This kind of situation usually occurs after maintenance and the vacuuming is not complete.

Solution: Drain the air, re-evacuate, and recharge with refrigerant.

5. False alarms caused by electrical faults

Because the high-voltage protection relay is damp, poor contact or damaged, the electronic board of the unit is damp or damaged, and the communication failure causes false alarms.

Solution: For this kind of false fault, the HP fault indicator light on the electronic board is often off or dimly lit, the manual reset of the high-voltage protection relay is invalid, the computer displays “HP RESET”, or disappears automatically, and the operating current of the compressor is measured to be normal. Pressure is also normal.