Which of the following steel stud wall assemblies gives a higher overall R-value? In both assemblies, the total amount of insulation is R-15.
A) Assembly B has an exterior insulating sheathing of R-3 and within-stud insulation of R-12
B) Assembly A has an exterior insulating sheathing of R-5 and within-stud insulation of R-10
B) Assembly A has an exterior insulating sheathing of R-5 and within-stud insulation of R-10
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What is the purpose of using an outdoor ambient thermostat on a heat pump installation?
A) To cycle the heat pump based on the outside temperature instead of the inside temperature B) To bring the heat pump on early if the temperature drops C) To prevent the heat pump from operating in heat unless it is cold outside D) To prevent the auxiliary heat from operating above the system balance point
On a typical shop pneumatic system what two tasks should be performed daily?
A. Check hoses for cracks or nicks. B. Test the operating pressure. C. Purge all hoses and tanks. D. Air tool oiling and draining accumulated water.
Check valves are used in the refrigeration system to route refrigerant in only one direction. On the refrigeration system that uses the 3-way valve how may check valves are used within the system?
A. 1 B. 2 C. 3 D. 4