Advertisement
Evacuating the lines and charging
with refrigerant gas
Leakage test
Wash the inlet and delivery pipes with pressurised dry nitrogen;
Connect a nitrogen cylinder to the high and low pressure connectors, making sure to also
install a pressure gauge (using a "T" union), and charge the high and low pressure lines with
gas to a pressure of approximately 15 bar (217.5 psi);
Close the cylinder cock and, after at least 1 hour, check that the pressure has not dropped
below the previous reading level;
Vacuum
Empty the circuit manually by opening the cocks on the unions;
Connect the pipes to a vacuum pump (preferably a twostage model with vacuum gauge
and high and low pressure connectors);
Reach a vacuum level equal to or lower than 70mTorr (0,0931 mbar / 0.00135 psig).
On reaching this vacuum level, maintain it for at least 30 minutes;
Charge the unit as follows:
104
Hide quick links:
Advertisement
