What is the purpose of the door switch on a walk-in freezer?
A) To energize the interior heaters to make the case a more comfortable temperature
B) To turn on the system to offset the added heat from opening the door
C) To turn on the light in the case when the door is opened
D) To prevent warm air from entering the case by shutting off the fans when the door is opened
D
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IDENTIFY TEST PROCESS SYMBOLS AND DIAGRAMS
Two-wire control ____.
a. provides no-voltage protection or low-voltage protection b. involves the use of a maintaining circuit c. prevents the restarting of machinery when power is restored d. provides no-voltage release or low-voltage release
What is the first action when the start button of a three-wire control circuit is pushed?
a. The circuit is completed through the coil. b. The contacts close. c. The power circuit contacts to the motor close. d. The holding contact remains off.
Walk-around inspections are useful when checking for _____
a. flow rates through the pump b. leaks and abnormal conditions c. shaft and coupling alignment d. binding of rotating componen