The coil on line #11 does not control which device?

The coil on line #11 does not control which device?

• A. The blower motor
• B. The condenser fan motor
• C. The compressor
• D. The thermostat

Answer: (A)

In HVAC, a relay or contactor coil acts as a low-voltage switch that, when energized, closes high-voltage contacts to power outdoor components. The coil on line #11, when energized by the thermostat’s cooling call, pulls in the contactor and supplies line voltage to the outdoor unit’s devices—the compressor and the condenser fan motor. The indoor blower motor is not part of this outdoor control path; it has its own indoor relay in the air handler. The thermostat provides the signal to energize the coil, not the other way around. So the device not controlled by that coil is the blower motor.

In HVAC, a relay or contactor coil acts as a low-voltage switch that, when energized, closes high-voltage contacts to power outdoor components. The coil on line #11, when energized by the thermostat’s cooling call, pulls in the contactor and supplies line voltage to the outdoor unit’s devices—the compressor and the condenser fan motor. The indoor blower motor is not part of this outdoor control path; it has its own indoor relay in the air handler. The thermostat provides the signal to energize the coil, not the other way around. So the device not controlled by that coil is the blower motor.