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10
Weigh in Liquid on High Side Method
NOTE: When using this method an access valve should have been attached to the compressor
process tube (low side) and the high side process tube on the drier.
Using a length of manifold hose, connect one end to the manifold, the other end to the
refrigerant cylinder.
It is best to use low loss fittings on hoses to avoid loss of charge when removing hoses.
Purge air from cylinder hose to manifold by loosening cylinder hose at manifold and bleeding
liquid through hose to manifold.
Set refrigerant cylinder on scale and turn scale on allowing it to stabilize and then zero scale.
Open manifold high side port and carefully charge unit to nameplate weight of charge by
watching scale.
Once the appropriate charge is weighed in, allow pressures to equalize.
Run unit for at least 10 minutes to confirm that the unit has a full frost pattern on the
evaporator and that the unit is not overcharged and there is no liquid returning back to the
compressor.
It is normal to have some condensation or slight frost on the suction line. Typically this will
occur towards the end of a run cycle. If the frost continues down the suction line to the
compressor, the system is overcharged.
Once the system is charged, clamp off the process tube downstream from the access valve.
Remove the valve, cut off the extra process tube with the piercing, fill the open end of the
process tube with solder. Remove the clamp from the process tube and leak check.
If you are using a soldered access fitting be sure to remove high side hose after the system
has equalized and before starting unit to check frost pattern.
Cap access fittings tightly and leak check system with unit off so that pressures are equalized
throughout the system.
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