Refrigerant can be charged as a liquid through the connection shown in Fig. 11.3 . Cylinder with a dip tube is connected as shown on the figure, and connecting pipes cleaned through a small volume of gas to expel the air from it. You want to invert the cylinder if not a dip tube. For small expenses, the bottle can be supported on the scales, and calibrated charging cylinder can be used.
The compressor must not run when the system is under vacuum refrigerant first admitted until the pressure in the cylinder. At this point, the compressor can be started, if we assume that all the auxiliary systems (condenser, fan, pump, tower fan cooler, etc) are executed. Valve liquid line before the connection fee is partially closed to reduce the pressure in the pipeline is currently below that the supply of the cylinder, and the refrigerant would continue to flow. While the refrigerant can be boldly acknowledged in this case the system is not working properly, since the throttle valve pressure reduction through the expansion valve.
At intervals during charging cylinder valve shall be closed and a throttle valve is fully open. Only this will work correctly noted. When fully charged, sight glass will be clear.
Alternatively, the pressure in the cylinder can be increased by gently heating. Any heating of this kind should be done only with the help of a bath of hot water should not exceed 40C or thermal jacket to look at the pressure in the cylinder. The increase in pressure in the cylinder, thus, avoids the use of the throttle and the charging process much faster.
If the receiver in the chain, this should be about one-sixth full under normal operating conditions. The refrigerant can also be taken as a gas in the suction line. This is usually done when the system is running and topped up. The liquid has evaporated, before it falls into the compressor. This can be done by charging through the collector set as shown in Fig. 11.3 and regulation of its low side valve. Just open the valve in the liquid turns into gas before logon.
Accounting quantity of refrigerant, added to the systems must be kept and the cylinder is placed on the scales for this purpose. High pressure systems float expansion valves, and those without indicator glass, must be charged sedately, frost line, or using the contact thermometer for measuring overheating. Small packages will have a charge marked on the plate must be carefully assessed on a weight which will be crucial.
Systems may need to be further lubricating oil added, to do something that will wear it with the refrigerant. In the absence of any clear guidance from the supplier, Carter shall be replenished gradually, during normal operation, until it is level with the middle of the sight glass in operating conditions. Not so with small hermetic systems, where usually enough oil in the compressor for the needs of the chain, and that in many cases they do not have the oil level sight glass.....