Answer to Question 1
A low water safety protects against dry operation or freeze up in the evaporator due to low water flow. A safety in the gear motor circuit will not allow the refrigeration system to operate unless the auger is rotating. A safety in the gear motor circuit will not allow the refrigeration system to operate if there is excessive load on the auger typically indicated by a high amperage draw.
Answer to Question 2
The advantage of manual reset is that a service technician has the opportunity to examine the cause of the problem before resetting the protective device.
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