York Rooftop Unit: B3CH Re: CONTROL LOCKOUT Any one of four conditions will put the system into a lock-out condition during the heating or cooling mode: High Temperature: The compressor discharge line temperature reaches 255°F (215°F reset) High Pressure: The discharge pressure reaches...

York Rooftop Unit: B3CH Re: DEFROST SEQUENCE OF OPERATION The BCH has a unique “ambient modified” time-temperature defrost control that automatically adjusts to changes in the outdoor temperature. The defrost control will shorten the defrost initiation time periods above 35°F and will extend...