RG66001652_REV.02
22
LCW - LCR
The best position for charging the air conditioners is the section between the thermostatic valve and the
evaporator; care should be taken to avoid fixing the thermostat bulb until the operation is complete. This is
important to ensure that the valve orifice remains open so as to allow the passage of refrigerant also toward the
condenser/receiver.
Air-condensing water chillers should be charged with refrigerant in the section between the condenser and
thermostatic valve, this favours flow into the larger-sized exchanger.
If possible, avoid the inflow of refrigerant into the compressor as this may cause excessive dilution of the
lubricant; in any case. first check the compatibility between the crankcase capacity and the required charge
volumes.
Safety valve drain pipes
A safety valve is present on the refrigerant circuit. Some regulations provide that the refrigerant drained
from the valves be conveyed to the outside by means of a suitable pipe with a diameter at least matching
that of the valve drainage outlet; the valve must not be made to bear the weight of the pipe.
The valves positioned on the compressor outlet only discharge hot saturated gas; those on the liquid
receivers, may discharge saturated liquid and pose a greater hazard of burns due to the strong
dehydrating effect caused by the sudden evaporation of refrigerant fluid in contact with bodies having a T
> -41 °C.
Warning: Always direct the drain pipe toward an area where the discharge cannot harm
people.
