HVAC 2 Exam Review EXAM 100% ACCURATE AND UPDATED!

If a heat pump works normally in the heating mode but will not provide cooling or defrost mode, which component is most likely defective? - ANSWERReversing valve Air-to-air heat pumps produce heat by - ANSWERextracting heat from the outdoor air and transferring it to the indoor air In addition to the reversing valve, the other major difference between a heat pump and a cooling-only system is that - ANSWERheat pumps require two metering devices In the cooling mode, the reversing valve is normally - ANSWERenergized When a heat pump is operating in the heating mode, the refrigerant bypasses the - ANSWERindoor coil metering device In the reverse-cycle heating mode - ANSWERthe indoor coil acts as a condenser What happens in the cooling mode if the discharge temperature switch fails? - ANSWERthe outdoor fan does not run If the outdoor thermostat is not closed and this system is in the heating mode, a likely symptom would be - ANSWERless supplemental heat available Defrost is initiated by the - ANSWERdefrost control Which of the following conditions is not common and proper during the defrost mode? - ANSWERthe compressor shuts off If a heat pump blows cool air into the conditioned space during the colder parts of the heating season, a possible cause is - ANSWERthat the supplemental electric heaters are not on during defrost During dual-fuel heart pump operation, the compressor and furnace burner can operate together - ANSWERduring periods of defrost The variable-speed indoor fan motor receives low-voltage input signals by way of - ANSWERa 16-pin connector If a heat pump will not initiate defrost and you suspect the reversing valve, the quickest way to verify your suspicion is to - ANSWERsee if the reversing valve switches when the operating mode is changed