York B3CH - Lockout Conditions

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 398 PSIG (310 PSIG reset)
• Freeze-Protect: The suction line freezestat equals 26°F (38°F reset)
• Low Pressure: The low-pressure cut-out equals 7 PSIG (22 PSIG reset).

► A lock-out energizes the emergency heat light on the thermostat and the red LED light on the unit relay board.

► Turning the thermostat switch to “Off” then back to “On”, will reset the system.