On the low side you have to charge, then wait for the system pressures to balance, then reexamine the frost line etc.An alternative to measuring the refrigerant charge when charging air conditioners or heat pumpsAs an alternative to making refrigerant measurements by weight or temperature-corrected volume using a scale or charging cylinder, some HVAC service technicians may adjust the refrigerant charge by watching the low side pressure and the exact location of the frost line at the evaporator coil (blower fan not running).On small refrigeration systems such as a home refrigerator or window air conditioner the refrigerant charge needs to be accurately measured or the system will not work properly. [3]This device provides fast, safe refrigerant charging when using tracing dye [or not] with these properties: ]Due to the variety of 220V. Technicians often allow +/- 3 degrees for measurement error.Flip the R-410 refrigerant jug over. Allow the system to run for 10 minutes.Measure the temperature of the liquid refrigerant line 6 inches from the service valve with a thermometer. If any heating method is used to inject vapour refrigerant into the suction line then 100% vapour must enter the compressor.Always charge the vapor refrigerant from the point where the system pressure is lower than the pressure in the charging cylinder.If we try to charge from the discharge side of the compressor then instead of refrigerant going from the charging cylinder to the system it may start reversing, filling the charging cylinder itself.Only during refrigeration system evacuation or when the system is insufficient of refrigerant, the refrigerant can be inserted to both the high and low-pressure side of the HVAC unit.Mostly large charging cylinder has two valves. We warned just above - don't overcharge the system - you can damage the equipment.Note that a reading of "zero" on these pressure gauges is not really zero, it's 14 psi or 1 atmosphere.Also if you look closely at your gauges you 'll see that one permits pressure readings in the "negative" direction - used when pulling a vacuum on the system using an evacuator pump - a step necessary before charging a system that has been opened for service or repair.To remove all moisture or refrigerant from an air conditioner, heat pump, refrigerator, or other refrigeration equipment your evacuator pump needs therefore to pump past "zero" on the gauge (14 psi) to absolute zero or 29.9" Hg vacuum.The evacuator pump is attached to the center port or "service port" on the gauge set.Charging cylinders such as the 1980's vintage equipment described below are often supplanted now (2011) by refrigerant charging scales and by larger, more sophisticated refrigerant charging machines that combine refrigerant charge measurement, refrigerant evacuation and recovery/recycling, and other service functions.Newer refrigeration service equipment can automatically recover refrigerant (such as R134A) from a system to be serviced, vacuum test and clean the system to prepare it for a charge, leak test the system, and insert the proper refrigerant charge, all automatically.These improved refrigeration management functions were required by a combination of legislation and standards that stop the discharge of refrigerants into the environment, and by improvements in refrigeration system design that produced equipment that uses a smaller, but more precisely-measured charge of refrigerant.Quoting from Robinair's description of their current refrigerant management equipment line:While the new refrigeration system testing and charging equipment described above is fully automatic, to understand the problems that the newer equipment has to solve (and automate), it is useful to review how, traditionally, we inserted a precisely measured refrigerant charge into air conditioners and other refrigeration equipment.We used the Robinair® Dial-a-Charge® charging cylinder for many years as a way to install an accurate charge of refrigerant into air conditioners, heat pumps, and refrigerators and freezers undergoing service or repair.
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