The instrument refrigerant inlet (the middle port of the instrument ) has a
port with valve core , which is used to vent the air in the hoes after
connecting the refrigerant to the instrument.
The port is equipped with a copper plug screw. It is required to tighten it
every time before or after operation.
Check the refrigeration system's pipes and connectors.
8. Glossary
Saturation
The state of saturation is the coexistence of a refrigerant in a liquid and gas
state.
Condensation temperature and evaporation temperature
Condensation temperature: in the condenser, the refrigerant is condensed
by the high-temperature gaseous refrigerant to the temperature of the liquid
refrigerant, that is, the saturation temperature under the condensing
pressure.
Evaporation temperature: in the evaporator, the refrigerant evaporates from
the liquid refrigerant to the temperature of the gaseous refrigerant, that is,
the saturation temperature under the evaporation pressure.
Degree of subcooling and superheat
Subcooling: condensing temperature - condensing outlet temperature.
Superheat: evaporation outlet temperature - evaporation temperature.
The lower subcooling can make the refrigeration capacity of the system
better. Adding subcooling circuit and economizer in the refrigeration system
is to increase the subcooling for refrigerant increasing.
Every hose terminal comes with a nylon pad that is limited a certain life of
using. Over use or other situation will make it defective, which result in
leakage.
The degree of expansion of the expansion valve (refrigerant charge) affects
the degree of superheat. The greater the degree of superheat, the smaller
the opening of the expansion valve can be determined (the refrigerant
charge is less).
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