LOW COOL LOCKOUT TEMPERATURE
Range
• OFF - Functionality disabled. Cooling always starts with first stage compressor (Y1)
and stages up to second stage (Y1 and Y/Y2) when the demand is sufficient and
staging and cycle timer constraints have been satisfied.
• 80° – 110°F - (5°F increments) Outdoor temperature above which both the first
and second stages of the compressor are energized to satisfy all cooling demands.
This check is performed when the first stage of the compressor is energized. If at the
time the compressor is energized the outdoor air temperature is greater than or
equal to the low cool lockout temperature, then the second stage of the compressor
is energized also. When a cycle starts under a low cool lockout condition, it finishes
the cooling cycle on high speed. If the cooling equipment is energized to satisfy a
dehumidify demand only (no cooling demand), the low cool lockout is not applied.
• ON - The Y1 and Y/Y2 outputs are simultaneously energized to satisfy all cooling
demands.
NOTES
• If there is no valid outdoor temperature and the LOW COOL LOCKOUT is set to a
temperature (not OFF or ON), the message OUTDOOR N/A is displayed in the banner
and the low cool lockout setting is ignored (acts as if the setting is OFF).
• If the system does not have a 2-stage heat pump, this selection is not available.
LOW HEAT LOCKOUT TEMPERATURE—Sets an outdoor air temperature below which low
speed compressor heating is locked out. Below the specified air temperature, all heating
demands that use the compressor use high speed compressor heating.
Range
• OFF - Functionality disabled. Compressor heating always starts with first stage
compressor Y1 and stages up to second stage Y1 and Y/Y2 when the demand is
sufficient and staging and cycle timer constraints have been satisfied.
• 20° – 50°F - Outdoor temperature below which both the first and second stages of
the compressor are energized to satisfy all heating demands. This check is
performed when the first stage of the compressor is energized. If at the time the
compressor is energized, the outdoor air temperature is less than or equal to the
LOW HEAT LOCKOUT TEMPERATURE, then the second stage of the compressor is
energized also. When a cycle starts under a low heat lockout condition, it will finish
the heating cycle on high speed.
• ON - The Y1 and Y/Y2 outputs are simultaneously energized to satisfy all compressor
heating demands, regardless of outdoor air temperature.
NOTES
• If there is no valid outdoor temperature and the LOW HEAT LOCKOUT is set to a
temperature (not OFF or ON), the message OUTDOOR N/A displays in the banner
and the low heat lockout setting is ignored (acts as if the setting is OFF).
• If the system does not have a 2-stage heat pump, this selection is not available.
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