Explain why split systems were developed
What will be an ideal response?
For many air conditioning systems, it is not practical to place all components in a single package, particularly those that involve the use of air cooled condensers. The air cooled condenser must have access to outside air so it is best placed outside. For this reason split systems have been developed with the inside unit consisting of a fan coil unit, with or without heating, an outside mounted air cooled condensing unit, and connecting refrigerant piping between the two.
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Four resistors are connected in series across an 18 V source. Three resistors drop 0 V and one resistor drops 18 V. What's the trouble?
A) The three resistors are open. B) One resistor is open. C) Two of the resistors are shorted. D) There is no trouble; these voltages are normal.
Which HFC refrigerant has taken the place of R-12 for use in domestic refrigeration?
A. R-134a B. R-404A C. R-409A D. R-410A
Which of the following refrigerants do not contain chlorine?
A. R-404a B. R-502 C. R-22 D. R-12
What should technicians avoid using in cooling systems?
A. Waterless coolant (WC). B. Tap water. C. Propylene glycol. D. Distilled water.