Type III — Low-PressureQuestion 187 of 240
During leak testing, some technicians raise the pressure in a low-pressure chiller just above atmospheric so that:
a.The rupture disk will vent
b.An electronic detector or bubbles can find the leak
c.The refrigerant condenses faster
d.The purge unit can be shut off permanently
Explanation
Because the chiller normally runs in a vacuum, a leak pulls air in rather than out, so a detector cannot sense escaping refrigerant. Raising pressure slightly above atmospheric, staying under 10 psig, makes refrigerant flow outward at the leak so it can be found. The pressure must never approach the rupture-disk setting.
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