3. To make sure that the concentration of tracer reached all parts of the system, slightly open
the service valve and test for the presence of gas with a leak detector.
4. Test around each joint and factory weld carefully and thoroughly.
5. To check for tube or tube joint leaks:
a. Isolate and drain the condenser and evaporator waterboxes
b. Purge the waterboxes and tubes with dry nitrogen through the vents or drains until the
detector does not indicate
c. Close the vents and drains and wait an hour
d. Open a vent or drain and insert the leak detector. If a leak is detected, the heads must
be removed and the source of the leak determined as outlined in Condensers and
evaporators.
6. Recover the test gas as applicable, make necessary repairs, repeat leak tests, evacuate the
chiller and perform time hold test. Always consider the effect of temperature change when
performing any time-based hold test. For an ideal gas, at time 1, pressure over temperature
(absolute unit system) = the ratio at time 2.
159
YMC
2
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