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Answer :
Final answer:
The initial charge for an R-410A water chiller should be done with vapor to a pressure of at least 120 psig. After reaching this threshold, the refrigerant is charged in its liquid form.
Explanation:
When charging an R-410A water chiller, one must first charge with vapor to a pressure of at least b) 120 psig, before switching to liquid charging. The initial phase of charging with vapor enables the system to reach a stable pressure where the refrigerant can safely be added without causing damage or operating inefficiencies. Once this pressure threshold is reached, the refrigerant is added in its liquid form. This two-step process is important for managing the pressure within the system as well as optimizing the performance of the chiller.
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