With {HEAD ~ the fan switch} in {TAIL ~ the on position} and heating or cooling called for, the control causes the blower to operate at a high speed, which may be different for heating or cooling 
With { HEAD ~ the fan switch } in { TAIL ~ the on position } and heating or cooling called for , the control causes the blower to operate at a high speed , which may be different for heating or cooling
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH