Common faults that cause high pressure in programmable high and low temperature alternating test chambers

1.
Overcharge of
refrigerant.
Such things generally occur after maintenance, mainly manifested as high working pressure of the suction exhaust pipe, balanced working pressure, and high
operating current of the refrigeration compressor.
Solution: Air should be released under rated load according to the working pressure of the suction exhaust pipe and the balanced working pressure and its operating current, until everything is normal
.
2.
The water cooling temperature is high, and the actual effect of the condenser is not good
.
The rated load of cooling circulating water specified by the refrigeration unit is 30~35 °C, the temperature is high, and the heat pipe heat dissipation is not good, which must cause the condenser working pressure to be high, which usually occurs in the high temperature season
.
Solution: The reason for the high temperature will be: the common faults of the closed circuit cooling tower, such as the centrifugal fan is not turned on and flipped, and the water distributor does not rotate, mainly manifested as the cooling circulating water temperature is very high and rises rapidly; The external average temperature is high, the water and land are short, and the water flow of the recirculating system is small, so the cooling circulating water temperature is generally maintained at a high level, and it can be treated
by raising the storage pool.
3.
The water output of water cooling is not enough, and the rated water
output cannot be reached.
The specific performance is that the water pressure difference between the inlet and outlet of the generator set is reduced (compared with the pressure difference at the beginning of the system software capital operation), and the temperature difference increases
.
Solution: The reason for insufficient water output is that the system software has less water or gas, and the solution is to install an automatic exhaust valve at the height of the pipeline to carry out the exhaust pipe; The pipeline filter is blocked or too fine, and the water permeability working ability is limited, so select a suitable filter and remove the filter screen on time; The centrifugal water pump is small and does not have supporting facilities
with the system software.
4.
The cooler is fouled or blocked
.
Condensate is generally used for drinking water, at about 30 ° C is very easy to accumulate scale, and because the closed cooling tower is open, immediately exposed to the gas, dust and dirt are very easy to enter the cooling system, resulting in dirty blockage of the cooler, small total heat transfer area, low high efficiency, and also endanger the water
output.
Its main performance is that the water pressure difference in and out of the generator set increases, the temperature difference increases, the temperature on the left and right of the cooler is very high, and the copper pipe of the cooler discharge air conditioner is hot
.
Solution: Back-cleaning should be carried out on time, and chemical decontamination
should be carried out when necessary.
5.
Random reports
caused by common faults of electrical equipment.
Because of the pressure maintenance car relay moisture, loose or damaged, module electronic device board moisture or damage, common communication faults cause chaotic reporting
.
Solution: This kind of false common fault, usually the HP fault indicator on the electronic device board is not on or slightly lit, the manual reset failure of the pressure maintenance car relay, the operating current of the refrigeration compressor is normal, and the working pressure of the suction exhaust pipe is also normal
.
6.
The refrigerant is stained with gas, N2 and other non-condensed
vapors.
Solution: Such things generally occur after overhaul, vacuum packaging is not complete
.
Only discharge, vacuum packaging again, recharge refrigerant
.