Economizer Configuration Requirements - RFC SL Series Technical Manual

5) It is recommended to install the solenoid valve of the oil circuit at the oil inlet of the
compressor to prevent the backflow of oil during shutdown or the possible oil entering the
compressor during shutdown;
6) It is recommended to install a manual stop valve (ball valve) before and after the oil
cooler for easy maintenance。

7.4 Economizer Configuration Requirements

Using the economizer to further subcool the refrigerant before the expansion valve of the
system, the cooling capacity and efficiency of the system will be improved, especially under
the conditions of high condensation and low evaporation temperature.
Economizer operation of subcooling cycle:
The economizer operation mode generally uses a heat exchanger as a liquid subcooler
to achieve the purpose of subcooling the liquid refrigerator. A part of the refrigerant drawn from
the condenser pipeline passes through the expansion valve of the economizer and enters the
subcooler to evaporate and absorb heat, and exchange heat with the liquid refrigerant in the
counterflow. The superheated saturated steam after heat absorption enters the economizer
interface of the compressor. The intermediate compression section of the compressor
compresses, this mode effectively increases the unit cooling capacity of the liquid refrigerant,
and at the same time effectively reduces the exhaust temperature.
Filter Dryer Oil Cooler Expansion Valve Economizer (ECO) Suction Filter
1) Compressor