![]() ![]() Parkers offering of refrigerant sight glasses features economical devices that combine moisture and liquid indication in a single unit. The compressor is trying to draw refrigerant from the evaporator through the suction line, but the liquid-line restriction is preventing refrigerant from entering the evaporator. Process Control Technology : Process Control. Most of the refrigerant will be in the receiver, with some in the condenser. This is caused from the TXV, evaporator, and compressor being starved of refrigerant from the liquid-line restriction. If you still see bubbles, this is an indication of a low refrigerant charge or low fluid levels. Sight glasses are used to detect refrigerant levels. If the system becomes completely restricted, the compressor will pump down the system and stay off, or short-cycle sometimes on the low-pressure control. Seeing bubbles in a sight glass is one of the indications that there is a problem with the refrigerant level that needs to be addressed. The severity of the restriction in the filter drier will determine how high the discharge temperature will be. This is assuming there is still some mass flow rate of refrigerant through the system. High compression ratios from the low evaporator pressure will cause high heat of compressions, thus high discharge temperatures also. Providing high-strength, quality sight glass products is. When moisture, pointing to the CD will include as shown here, it becomes moisture, pointing to the sight glass. This allows the installer or Servicer to observe the state of the refrigerant in the sight glass in place. Most of the refrigerant will now be stored in the receiver simulating a pumped-down refrigeration system.Ī starved evaporator from the liquid line (filter drier) restriction will cause the high superheats. Sight glass-window that allows the mechanic to see inside the system. ![]() This small amount of heat to reject will cause a low condensing pressure and temperature. This is simply not the case, especially on a TXVreceiver system.Ī restricted liquid line will starve the evaporator of refrigerant, causing low evaporator pressures. However, any restriction or damage to the liquid line from the receiver outlet to the metering device inlet will have similar symptoms as a restricted filter drier.īecause the filter drier is located in the liquid line, a restricted filter drier can now be referred to as a liquid-line restriction.Īssume, for sake of discussion, that the refrigeration system is a TXVreceiver system employing a filter drier and sight-glass. The liquid line is located between the receiver and metering device (Figure 2). The liquid line is located between the receiver and metering device.įor this purpose I have included a service checklist (Table 1) as well as a number of illustrations. When the valve closes, the flow is restricted and the refrigerant backs-up in the liquid line. ![]()
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