Which component would you not typically find in an outdoor unit of an air source heat pump?

In an outdoor unit of an air source heat pump, a blower relay is typically not present. The outdoor unit primarily houses components that are essential for heat exchange in the heating and cooling process. The compressor, which is responsible for compressing the refrigerant and circulating it through the system, is indeed found in the outdoor unit, along with the condenser coil, which plays a critical role in releasing or absorbing heat as the refrigerant goes through its phase changes.

The expansion valve is also an integral part of the system, but it is usually located in the indoor unit or at the transition point between the indoor and outdoor units, functioning to regulate the flow of refrigerant entering the evaporator coil.

In summary, while the outdoor unit contains essential components for the heat pump's operation, it does not include a blower relay, which is associated with the indoor unit where air is circulated through the system.