The control switches the motor to {HEAD ~ a speed} substantially slower than the operating condition speed to provide {TAIL ~ continuing air circulation} until the thermostat again calls for thermal operation 
to provide
The control switches the motor to { HEAD ~ a speed } substantially slower than the operating condition speed to provide { TAIL ~ continuing air circulation } until the thermostat again calls for thermal operation
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH