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Parameter Name/Description
LOW COOL LOCKOUT — (Heat pump operation only) Enables the thermostat to start all
cooling stages on a demand for cooling based on the configured value. Normal cooling
always starts with first stage compressor (Y1) and stages up to the second (Y2), when
the demand is sufficient and staging and cycle timer constraints are satisfied.
If the outdoor temperature is equal to or greater than the configured value of 80 to
110°F, all stages of cooling are energized. If set to ON, all stages are energized on a call
for cooling. The outdoor temperature must also be greater than the COOL LOCKOUT
value. When a cooling cycle starts under a high cool latch, it finishes the cooling cycle on
HIGH STAGE. If the cooling equipment is energized to satisfy a dehumidify demand only
(no cooling demand), the latch is not applied.
LOW HEAT LOCKOUT — (Heat Pump operation only) Enables the thermostat to start all
compressor heating stages on a demand for heating, based on the configured value.
When the COMPRESSOR TYPE is set to HP and compressor heat is requested, it always
starts with the first compressor stage (Y1) and stages up to second stage (Y1 and Y2)
when the demand is sufficient and staging and cycle timer constraints have been
satisfied.
If the outdoor temperature is equal to or less than the configured value of 20 to 50°F,
both the first and second stages of the compressor are energized to satisfy all heat
pump heating demands. If set to ON, both compressors are energized on a call for
heating. The outdoor temperature must also be greater than the HP LOCKOUT value.
When a cycle starts under a high heat latch, it finishes the heating cycle on HIGH STAGE.
TIME BETWEEN FUEL TYPES — The minimum time limit between switching from one fuel
type to another (other staging rules may also be in effect). Use only if the COMPRESSOR
TYPE is set for HP.
CYCLE TIMER — The maximum number of heat cycles per hour
HUMIDIFIER — The output relay enables a field-installed humidifier. The humidifier is on
if there is humidity demand and any heating equipment is on. If set to YES, the
thermostat cannot be configured for Humidi-MiZer™ or Dehumidification. See
HUM/DEHUM OUTPUT in this table for output relay details.
DEHUMIDIFIER — Sets the output relay to enable a factory-installed Humidi-MiZer™ for
dehumidification or to use the first stage of cooling.
•
If HUMDIMIZER, the output relay energizes the Humidi-MiZer™ on the Carrier unit.
•
If YES, the Y1 relay is energized. A new space temp setpoint is calculated to force
cooling operation.
NOTE For details about this calculation, see HUMIDITY (page 29).
•
If OVRCL(2), it uses the first stage of cooling to satisfy a dehumidification demand,
but will not overcool the space by more than 2°F.
•
If dehumidification is configured, the thermostat cannot also be configured for a
humidifier. Additional optional functions may be limited, based on the flex outputs
available.
MAX HEAT SETPOINT — The maximum heating setpoint available on the Heat Setpoint
Wheel and the maximum heating setpoint that can be used during the occupied program
schedule
33CONNECTSTAT43
Installation Guide
17
Configuring the system
Default and Range
D:
OFF
R:
OFF
80 to 110°F
(5°F increments)
ON
D:
OFF
R:
20 to 50°F
(5°F increments)
ON
D:
15 MIN
R:
10, 15, 20, 25 MIN
D:
4
R:
2, 4, 6, 8
D:
NO
R:
YES/NO
D:
NO
R:
NO
YES
OVRCL(2)
HUMDIMIZER
D:
88°F
R:
50°F to 88°F
©2022 Carrier.
All rights reserved.
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