Type III — Low-PressureQuestion 176 of 240
A technician wants to warm the refrigerant in a low-pressure chiller to speed recovery. Which method is acceptable?
a.Adding oxygen to raise pressure
b.Circulating warm water through the chiller tubes
c.Applying a propane torch to the shell
d.Setting a space heater against the tubes
Explanation
Circulating warm water through the chiller tubes gently raises refrigerant temperature and speeds recovery without risk. Using the machine's built-in heaters is also acceptable. An open flame such as a torch, or introducing oxygen, is dangerous and prohibited.
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