By A. C. Bryant
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Extra info for Refrigeration Equipment: A Servicing and Installation Handbook, Second Edition
It is carried out when the functions of the compressor suction and discharge valves are suspect; this will be indicated by high suction and low discharge pressures. 5 bar if possible in order to prove the efficiency of the valves. The procedure is as follows: 1 Front seat the suction service valve and note the cut-out pressure of the low pressure control. The control must be reset to its original cut-out pressure after the test. 2 Alter the range of the low pressure control so that the compressor is drawing a vacuum.
The ideal location for a sight glass is just before the expansion valve, although it is common practice to install them close to the condensing unit. Ideally two sight glasses should be installed, one near the condensing unit and the other before the expansion valve. This will determine whether a solid column of liquid reaches the expansion valve. Restricted refrigerant flow to the evaporator can be caused by the following: 1 A partial blockage may occur in the filter drier, thereby creating a pressure drop in the liquid line.
Continued adding of refrigerant when bubbles show in the sight glass can also result in the system being overcharged. Shortage of refrigerant in evaporator A situation could arise where the sight glass shows full of liquid yet a shortage of refrigerant is evident in the evaporator. This may be due to a number of factors. Refrigerant liquid can flash off in long liquid line runs. The ideal location for a sight glass is just before the expansion valve, although it is common practice to install them close to the condensing unit.
Refrigeration Equipment: A Servicing and Installation Handbook, Second Edition by A. C. Bryant