Carrier T--298 - Manual (Page 40)

T--298 3-16
NOTE
If the FAN button is pressed again or if no button
is pressed for two minutes, the thermostat will
exit the configuration mode and return to nor-
mal operation. To re--enter the configuration
mode, the FAN button must be pressed and
held for 10 seconds again.
While in the configuration mode, the following options
are available:
A . ANTICIPATOR -- Value Adjustment
This adjustment controls the sensitivity and cycle rate of
the
thermostst. Higher numbers decrease the
sensitivity and slow the cycle rate. Lower numbers
increase the sensitivity and increase the cycle rate.
However, a limiting feature will not allow more than 4
equipment cycles per hour, regardless of setting. Values
can range from 1 to 3. Factory default setting is 2. This
default selection will provide optimum performance in
nearly all installations. Try it first. Do not change settings
unless there is evidence of need to do so. Unlike
conventional anticipators, this setting is not determined
by current draw. There is no need to measure, know, or
compensate for current.
To Adjust:
a. Enter configuration mode (if not already there).
b. Use UP & DOWN buttons to display A .
c. Press MODE button once to display current value.
d. Use UP & DOWN buttons to move between values.
e. Press MODE buttonto return to A . UP & DOWN
buttons now move between option choices A, d, oF or
press FAN button to exit configuration mode.
d. Fahrenheit/Celsius Selection
This selection operates the thermostat in either
Fahrenheit or Celsius.
To Select:
a. Enter configuration mode (if not already there).
b. Use UP & DOWN buttons to display d.
c. Press MODE button once to display current
selection of F or C .
d. Use UP & DOWN buttons to change between F & C .
e. Press MODE buttonto return to d . UP & DOWN
buttons now move between option choices; or press
FAN button to exit configuration mode.
oF. Room Temperature Offset Adjust Selection
The selected number is the number of degrees, plus or
minus, which will be added to the actual temperature.
The numbers can range between --5 and +5. Factory
default is 0. This adjusted value will be used as actual
temperature for both display and control action. The
effect is that a positive number selection will make the
room
temperature lower, and vice versa. The
thermostat is calibrated within an accuracy of plus or
minus 2 degrees when shipped from the factory; this
adjustment will provide the best accuracy when set to o.
To Select:
a. Enter configuration mode (if not already there).
b. Use UP & DOWN buttons to display oF .
c. Press MODE button once to display offset value.
d. Use UP & DOWN buttons to select a value between
--5 and 5.
e. Press MODE buttonto return to oF . UP & DOWN
buttons now move between option choices; or press
FAN button to exit configuration mode.
3.10 CHECK THERMOSTAT OPERATION
3.10.1 Fan Operation (Cool Only)
1. Press FAN button, starting fan operation. FAN an-
nunciator turns on; Lo is displayed in the room tem-
perature area for 5 seconds indicating Fan Low
Speed.
2. Press FAN button, FAN annunciator remains on; Hi
is displayed in room temperature area for 5 seconds
indicating Fan High Speed.
3. Press FAN button, stopping fan operation. FAN an-
nunciator turns off.
3.10.2 Fan Operation (Heat/Cool)
1. Press FAN button, starting low fan (Lo) operation.
FAN annunciator turns on.
2. Press FAN button, starting high fan (Hi) operation.
FAN annunciator remains on.
3. Press FAN button, stopping fan operation. FAN an-
nunciator turns off.
3.10.3 Cooling Operation (Cool Only)
1. Press and release MODE button until COOL is dis-
played.
2. Press DOWN button until LCD readout reads 10 de-
grees below room temperature. Cooling and High
Fan system should begin to operate within 5 min-
utes.
3.10.4 Cooling Operation (Heat/Cool)
1. Press and release MODE button until COOL is dis-
played.
2. Press DOWN button until LCD readout reads 10 de-
grees below room temperature. Cooling and High
Fan system should begin to operate within 5 min-
utes.
3.10.5 Heating Operation (Heat/Cool)
1. Press and release MODE button until HEAT is dis-
played.
2. Press UP button until LCD readout reads 10 degrees
above room temperature. Heating system should
begin to operate within 1 minute.
3.11 CHECK THERMOSTAT OPERATION
3.11.1 Temperature Display
The thermostat will display room temperature until the
UP or DOWN button is pressed. The word SET appears
when these buttons are pressed and the current set
point is displayed. If no buttons are pressed for 5
seconds, the display will change back to show room
temperature.