HOW TO DISCHARGE EXCESS REFRIGERANT:
Either too much or too little refrigerant will result in improper operation.
Systems with too much refrigerant are somewhat like those with air in the system. THE HEAD PRESSURE BEING TOO
HIGH. For correct head pressure, see Name Plate.
If the operating head pressure is too high, stop the machine, if the off head pressure is still higher than the corresponding
room temperature, air is In the system. However, if the off room temperature, air is the system. However, if the off
pressure drops to normal, the indication is too much refrigerant. This excess liquid reduces the amount of condenser area
and overloads the machine causing t to run excessively.
The overload protection may trip; the condenser will be hotter than normal near the top and cooler than normal near the
In any case, refrigeration will not be satisfactory and the charge must be reduced to the correct amount by discharging the
Excess refrigerant is released through the highside service valve. The high pressure gauge must be attached to the
highside valve in the regular way to observe the drop in pressure as the refrigerant is removed. The gauge connection of
the highside service valve may be opened a little, two or three times in succession until the pressure comes down to a
normal corresponding value of the condensing gas pressure and the room temperature in which the cooler is operating.
Open the discharge service valve to release some refrigerant. Don't let too much refrigerant out at a time, because this
may discharge more refrigerant than necessary and result in improper operation of the cooler.