When is the solenoid coil on the four-way reversing valve energized in the above heat pump the heating mode or the cooling mode?

In a heat pump system, the solenoid coil on the four-way reversing valve is energized in cooling mode. When the system is in cooling mode, the solenoid energizes to switch the direction of refrigerant flow, allowing it to absorb heat from the indoor air and release it outside. Conversely, in heating mode, the solenoid is de-energized, reversing the flow to heat the indoor space.