Question 11Refrigeration & AC - 1st Asst/Chief
70% to passIf it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done? Illustration GS-RA-14
A"2" should be turned to further compress the spring
B"2" should be turned to relax the compression of the spring
C"4" should be rotated to compress the enclosed bellows
D"4" should be rotated to relax the enclosed bellows
AI Explanation
The correct answer is A) "2" should be turned to further compress the spring. To increase the operating head pressure of the refrigeration system, the spring-loaded valve (item "2" in the illustration) must be adjusted to increase the compression of the spring. This will raise the pressure at which the valve opens, resulting in a higher operating head pressure in the system. The other options are incorrect because: B) Relaxing the spring compression would decrease the operating head pressure. C) Compressing the bellows (item "4") would not directly affect the spring-loaded valve that controls the head pressure. D) Relaxing the bellows would also not impact the spring-loaded valve.
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