During HFC-134a refrigerant recovery, when gauge readings indicate pressure in an A/C system after a 5 minute pause since the system was drawn into a vacuum, you should:
A. Repeat the recovery process
B. Wait overnight, then add refrigerant
C. Flush the system with ester oil
D. Vent the remaining refrigerant
Answer: A. Repeat the recovery process
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For the net cash flow series shown, (a) apply the two rules of sign change, (b) find the external rate of return using the ROIC method at an investment rate of 15% per year, and (c) determine an i* using the IRR function with and without the ROIC determined in part (b).
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What is the purpose of the legend on HVACR electrical diagrams?
A) To provide the operational sequence for the unit B) To list the symbols used in the diagram and define their use C) To show all the product variations and trace the history of that model D) To provide a reference list of the circuits used in the diagram
Automatic identification of outward dialing is a feature of:
A) 800 number services B) wide area telephone services C) InterLATA voice services D) centrex
Convert 374°F to Celsius
What will be an ideal response?