Question

which of the following statements is true?
when a heat pump is in the cooling mode, the indoor coil is the cor
when a heat pump is in the heating mode, condenser line should be hours
when a heat pump is in the cooling mode, the outdoor coil is the eva
when a heat pump is in the heating mode, the emergency heat switc
when a heat pump is in the heating mode, the indoor coil is the cond
question 13
a heat pump in the defrost cycle
has the outdoor fan running
is working at maximum efficiency
may have the system operating in the cooling mode
will shut down the indoor house fan
will shut down the back - up heat

Explanation:

1. For the first - type questions about heat - pump operation modes:

• In the cooling mode of a heat - pump, the indoor coil is the evaporator and the outdoor coil is the condenser. In the heating mode, the indoor coil is the condenser and the outdoor coil is the evaporator.

1. For the defrost cycle of a heat - pump:

• During the defrost cycle, the heat - pump may reverse its operation, which means the system may operate in the cooling mode to melt the frost on the outdoor coil. The outdoor fan usually stops running during defrost to prevent blowing cold air outside and to allow the heat from the refrigerant to defrost the coil. The system is not working at maximum efficiency during defrost as it is in a non - normal operation state for the purpose of removing frost. The indoor fan may or may not shut down depending on the design, and the back - up heat is not necessarily shut down.

Answer:

• For the first set of statements: The statement "when a heat pump is in the heating mode, the indoor coil is the condenser" is true.
• For the defrost cycle question: A heat pump in the defrost cycle may have the system operating in the cooling mode.