Question

A heat pump has a thermostatic expansion valve (TEV) and a check valve at each coil. When the modes are reversed, what happens?

1) The heat pump operates in cooling mode
2) The heat pump operates in heating mode
3) The heat pump shuts down
4) The heat pump operates in defrost mode

Answer 1

When the modes are reversed, the heat pump operates in cooling mode.

Step-by-step explanation:

When the modes are reversed, the heat pump operates in cooling mode. In its heating mode, the heat pump absorbs heat from the outdoor air and transfers it to the indoor space. However, when the modes are reversed, the heat pump absorbs heat from the indoor space and transfers it to the outdoor air, resulting in cooling.