HVAC Electrical Exam Questions with 100% Complete Solutions

The heat pump requires ______________thermostat. a. single stage heating operation b. two stage heating operation c. three stage heating operation - two stage heating operation the thermostat will look for the ____ circuit first before using the battery back-up power. a. R b. C c. Y - C the ____ circuit is a 24 volt L1 from the transformer. a. R b. C c. Y - R the ______ circuit is a 24 volt L1 control string compressor circuit. a. R b. C c. Y - Y The _____ circuit is a 24 volt L1 control string Fan circuit. a. G b. AUX c. O/B - G The _____ circuit is a 24 volt L1 control string Reversing Valve circuit. a. G b. AUX c. O/B - O/B The _____ circuit is a 24 volt L1 control string 2nd Stage Heating circuit. a. G b. AUX c. O/B - AUX (and it's white) Which terminal do you use when energizing the reversing valve in the heating mode? a. B b. O c. R - B The thermostat ___________________ allows the technician to bring on specific components of the HVAC system. a. Self-Check Mode b. Component Mode c. Installer Test Mode - Installer Test Mode Conventional Terminals: (Non-H/P) R W Y G C - R = 24VAC L1 pwr from heating XFMR W = heating circuit Y = compressor circuit G = fan circuit C = 24VAC L2 common from XFMR Heat Pump Terminals: R O/B Y G AUX C - R = 24VAC L1 pwr from heating XFMR O/B = reversing valve circuit Y = compressor circuit G = fan circuit AUX = 2nd stage heat C = 24VAC L2 common from XFMR The heat pump system is controlled by the ____________ a. evaporator b. indoor blower c. thermostat - thermostat The _____________ is the heat pump component that houses the indoor blower. a. thermostat b. outdoor unit c. electric furnace - electric furnace