How to detect: Insufficient subcooling

How to determine: Lack of hypothermia

Not enough hypothermia, blocked filter-drier, a bend in the liquid line, a small solenoid valve and others, can cause outbreaks of gas in the liquid line, which reduces the bandwidth expansion valve
Flash gas is often causes sound hunting, which can be seen in the suction pressure manometer
Bubbles, which can be observed from the sight glass, if it is installed just before expansion valve
It is also possible to use electronic sight glass, such as TIFF-4000A to determine the state of the refrigerant

How to determine: the Dirt in the evaporator

Impurities on the water side can lead to fouling and even block some of the waterways.
Fouling will reduce the pressure boil and, thus, system capacity
Blocked water channels are very harmful for TEV operations because of the refrigerant drops can flow through the evaporator.

The evaporator can be cleaned by pumping water in the opposite direction compared to the normal operation.

Cleaning agents can also be used.

There is a risk of freezing, when other refrigerants R407C and high temperature are used glide
Although boiling temperature is above 0 C temperature at the inlet of the evaporator can be below 0 C
Even a partial freeze will reduce refrigerant capacity and increase the risk evaporator breakdown
Risk can be estimated by drawing cycle as log p (h)schema
In brine temperature measurement systems freezing using qualitative tools or simply place the sample in a frozen state, and attention to its melting/freezing points

Although the water flow and temperature depending on the choice of the program boiling point below, and overheating higher than it should be
The reason may be uneven distribution of the liquid inside the evaporator
Carefully remove the insulation from the evaporator side. Measure the surface temperature at many points with responsive thermometer
Temperature variations on a horizontal plane will be uneven liquid (water or) distribution inside the evaporator

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