b) Connect the high pressure hose (red) from the manifold to the condensing unit low service valve;
c) Connect the service hose (yellow) of the manifold to the nitrogen pressure regulator.
d) Open the register and adjust the pressure regulator of the nitrogen cylinder;
e) Open the register on the high side of the manifold and allow nitrogen to enter the system until it reaches 150 psig;
f) Close the manifold register;
g) Check for leaks in connections and soldering points using soap suds;
h) If not, increase system pressure to 300 psig and repeat operation.
Comments:
For equipment that works with R410A, it is recommended to test the system with 550 psig, due to the fact that this refrigerant works with pressures higher than R22;
To verify the existence of micro-leaks through the leakproofness test, it is recommended to keep the system pressurized for a period of 24 hours;
Nitrogen varies by 1.5 psig for every 1 ° C of temperature variation. Therefore, it is recommended to note pressure and temperature at the beginning of the test and compare the values at the end;
Once the leak has been identified and corrected, the vacuum process and the effectiveness check should be redone.
