Factory Defaults; Calibrate Sensor; Check Thermostat Operation - Carrier 33CS Installation And Operating Instructions Manual

FAN OPERATION (Step 5) — If the fan operation is set to
ON, the fan will operate at continuous low speed. If the fan
operation is set to OFF, the fan will cycle off and will only be
energized during a heating or cooling cycle (AUTO mode). The
default is ON.
NOTE: When a remote temperature sensor is used, the choice
should be Fan ON.
DEADBAND (Step 6) — The deadband is the difference in
temperature above the cooling set point or below the heating
set point that the thermostat will wait before turning on the first
stage of heating or cooling. For example, if the cooling set
point is 82 F (28 C) and the deadband is 2 degrees, the first
stage of cooling will not be energized until the temperature
reaches 84 F (30 C). The range of values is 1 to 6 degrees. The
default is 2 degrees.
NOTE: If single set point operation is used, the deadband will
be above and below the single set point.
SET POINT MINIMUM DIFFERENCE (Step 7) — The min-
imum difference between heating and cooling set points can be
user-configured. The range is from 0 to 6 degrees. The default
is 2 degrees. The minimum difference is enforced during
Autochangeover and Program On operation.
BACKLIGHT DISPLAY (Step 8) — The display backlight
can be set to ON (always on) or OFF (turn off 8 seconds after
usage). The default is OFF.
FAHRENHEIT/CELSIUS OPERATION (Step 9) — The ther-
mostat can be set to operate in Fahrenheit or Celsius degrees.
Set the variable to "F" for Fahrenheit operation. Set the
variable to "C" for Celsius operation. The default is "F."
REMOTE SENSOR (Step 10) — The Remote Sensor con-
figuration is used to configure the operation of a remote sensor
(if used). If the configuration is set to Yes, then the remote
sensor will function as an outdoor temperature sensor (read
only). The thermostat will not control to the temperature. If the
configuration is set to No, then the remote sensor will function
as a remote temperature sensor. The thermostat will control to
the temperature reading from the sensor. The default is Yes.
DRY CONTACT SWITCH (Step 11) — Step 11 is used to
configure the dry contact switch as normally open (NO) or
normally closed (NC). The default is NO.
DRY CONTACT SWITCH OPERATION (Step 12) — Step
12 is used to configure the operation of the dry contact switch.
When the dry contact switch is active, the thermostat can enter
Occupied or Unoccupied mode. If the configuration is set to
Occupied, then the thermostat will enter Occupied mode when
the dry contact switch is active. If the configuration is set to
Unoccupied, then the thermostat will enter Unoccupied mode
when the dry contact switch is active. The default is Occupied.
NOTE: Step 13 will only be displayed if Step 12 is set to
Unoccupied.
DRY CONTACT SWITCH UNOCCUPIED OPERATION
(Step 13) — If the Step 12 configuration is set to Unoccupied,
then the thermostat will enter Unoccupied mode when the dry
contact switch is energized. Step 13 determines what the ther-
mostat will do when it enters Unoccupied mode. If the configu-
ration is set to Unoccupied Set Points, then the thermostat will
control to the unoccupied set points. If the configuration is set
to Off, the thermostat will turn off the fan coil during Unoccu-
pied mode. The default is to control to the unoccupied set
points.
The dry contact switch configuration allows for the dry
contact switch input to be used for a condensate overflow
switch when correctly configured. For example, when the drain
pan is full, a condensate switch would trip the dry contact,
causing the fan coil unit to shut down.
Table 3 — Advanced Setup Configuration
STEP DESCRIPTION
1 Display Blanking
2 Single/Dual Set Point
3 2 or 4 Pipe System
2-Pipe System
4
Operation
5 Fan Operation
6 Deadband
Set Point Minimum
7
Temperature Difference
Thermoglow™
8
Backlight
9 Temperature Units
10 Remote Sensor Setup
11 Dry Contact Switch
Dry Contact Switch
12
Operation
Dry Contact Switch
13
Unoccupied Operation
Factory Defaults —
factory default settings, perform the following procedure:
1. Set the thermostat mode to OFF.
2. Hold down the Mode button and press the DOWN
ARROW button simultaneously for 5 seconds. All of the
icons on the display screen will appear.
3. Press and hold the Fan button until Fd (factory defaults)
appears on the screen.
4. Press the Mode button twice to return to normal display.
Calibrate Sensor —
calibrated. Under normal circumstances, there will never be a
need to re-calibrate the thermostat. If re-calibration must be
done, perform the following procedure:
1. Set the thermostat mode to OFF.
2. Hold down the Mode and DOWN ARROW buttons for
5 seconds. All of the icons on the display screen will
appear. Release the buttons.
3. Press the Mode button. The current temperature will be
displayed.
4. Use an accurate thermometer to measure room tempera-
ture. Press the UP or DOWN ARROW buttons until the
number equals room temperature.
5. Press the Mode button to return to normal operation.

Check Thermostat Operation

FOUR-PIPE OPERATION — To check thermostat opera-
tion with a 4-pipe system, perform the following procedure:
1. Turn on power to fan coil unit.
2. Press the Mode button repeatedly until the Heat icon
appears on the display. The thermostat is now in Heating
mode.
3. Press the UP ARROW button until the heating set point is
10 F (6 C) higher than the current room temperature.
The hot water valve will open and the fan should be
energized.
6
RANGE DEFAULT
OFF/ON ON
1, 2 2
2, 4 4
1-5 3
OFF/ON ON
1-6 degrees 2
0 - 6 degrees 2
OFF/ON OFF
F/C F
YES/NO YES
NO/NC NO
Occupied,
Occupied
Unoccupied
Off, Set Points Set Points
If the thermostat needs to be reset to
Every thermostat is factory-