The device in figure "A" of the illustration is used to control the flow of water through a water cooled condenser of a refrigeration unit. Where would the pressure connection be made leading to the control bellows? See illustration GS-RA-15.
• Identify that device A is a water-regulating valve used on water-cooled condensers • Recall that this valve modulates cooling water flow based on refrigerant pressure, not water pressure • Understand where the refrigerant gas space exists in relation to the condenser and compressor
• Ask yourself: Is this valve supposed to sense changes on the refrigerant side or on the water side of the condenser? • If the goal is to keep condenser pressure nearly constant, which point in the system best represents the high-side refrigerant pressure? • Which of the listed connections would actually see the pressure change as condenser load and temperature vary?
• Confirm that the control bellows must be exposed to refrigerant pressure, not water pressure • Verify which options are on the high-pressure side of the system rather than the low side (crankcase) • Eliminate any choices that are on the water piping instead of the refrigerant gas space
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