Automatic. Compact. Electronic.
Model APMF AUTO-PURGERS are for use in halocarbon refrigeration systems. The installation and operation of these AUTO-PURGERS are similar to that of an ammonia AUTO-PURGER M.
Purging at several points, up to four with the APM, on the high-pressure side of the system is the best method for removing foul gas. Foul gas is refrigerant gas containing some air or other noncondensibles. Several points should be used because it is nearly impossible to predict where noncondensible gas will accumulate in a system.
Even for multipoint purging, only one purge point should be purged at a time. Connecting two purge points from two condensers or receivers may result in gas flowing from one condenser to another. This is due to an unequal pressure drop, even though the differences in pressure drop are very small, for example ¼ psig (0.02 bar). The result would be that, even in the best of circumstances, only one point is effectively purged. The best practice is to purge each condenser and receiver circuit separately.
Use standard refrigeration procedures to check the APM for leaks before placing it into service. Manually open one purge point solenoid valve. Open the foul gas line shut-off valve and wait a few moments for the flooded evaporator to pressurize through the metering orifice. Allow pressure to build to condensing pressure, as shown on the high side pressure gauge. Close the foul gas line shut-off valve and check the purger for leaks.
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