As an aid to service technicians who may have lost their instruction sheet we include and comment on the charging cylinder instructions here, using the Robinair offered the following explanation of charging cylinder use along with our 1980's vintage equipment.With an increase in temperature in any cylinder filled with refrigerant, there is a corresponding increase in pressure and a change in the volume of liquid refrigerant in the cylinder. Manufacturers include a refrigerant charge in new air conditioning systems that will provide the correct amount of refrigerant for the unit and a 15 to 25 foot refrigerant line set.

[3]This device provides fast, safe refrigerant charging when using tracing dye [or not] with these properties: That's because sending liquid refrigerant into the suction side of a compressor motor is likely to destroy the motor in seconds - liquids are not very compressible and motor parts or valves are likely to be damaged in most motor designs.When we are charging a refrigeration system from its high pressure side we can safely introduce liquid refrigerant into the piping or reservoir (the receiver) on that side of the system without damaging it.Some refrigerant charging systems including one that I used metered the liquid refrigerant into a charging cylinder so that we can see the precise charge volume to be introduced - a measured refrigerant charge - into the refrigeration system. In fact, the temperature is … Technicians often allow +/- 3 degrees for measurement error.Flip the R-410 refrigerant jug over. In order to get more refrigerant into the system to complete the charge, heat must be applied to the cylinder.Robinair's Heated Dial-a-Charge Charging Cylinder eliminates the problem caused by equalization of pressure between the cylinder and the system being charged. This is critical for cooling or heat pump systems that do not use a receiver and that must be charged with exactly the refrigerant volume specified by the manufacturer.In this case we add a vaporizing device like the Kwik Charge - described here - on the outlet of the charging cylinder that converts liquid refrigerant into gas as it exits the charging cylinder and before it enters the HVAC equipment on the low side, thus guaranteeing that we don't damage anything. 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.

Procedure for using a vaporizing connector for low-side refrigerant charging, Kwik-Charge™ example & Using a refrigerant line sight glass or listening for refrigerant line gurgling to indicate charge level.As we've explained, charging an empty system will require evacuating it first. High Side Refrigerant Charging When charging an air conditioner, heat pump, or refrigeration appliance from the high side, the system being serviced is turned OFF. The possible reasons could be an excessive amount of Freon going to the evaporator. Most refrigerant blends boil at different rates and require complete evacuation before adding a full charge. Always charge R-410, as a liquid, with the valve and hose facing the ground. The resulting number will equal the subcooling value.Check the condenser's label for the designed subcooling value. The logic for doing this is to prevent older refrigerants such as R-12 that contain ozone depleting CFC compounds from getting into the atmosphere.

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