Minimum On Timer; Staging Timer; Error Messages; Heating/Cooling Operation - Carrier Standard Programmable Thermostat Homeowner's Manual/ Installation, Start-Up, And Operating Instructions

TO SELECT:
1. Enter configuration mode if not already there (see above).
2. Use UP and DOWN buttons to make the large (now flashing)
display indicate 10.
3. Press TIME/TEMP button once to flash the small display.
4. Use UP and DOWN buttons to move between H (energized in
heating) or C (energized in cooling) on the small display.
Factory default is C.
5. Press TIME/TEMP button again to flash the large display for
selection of another option, or press HOLD/END to exit the
configuration mode.
OPTION 13—ROOM TEMPERATURE OFFSET ADJUST-
MENT
This option allows calibration (or deliberate miscalibration) of the
room temperature sensor. There are various reasons why home-
owners may want to have displayed temperature adjusted to a
higher or lower value.
NOTE: Do not adjust for 30 minutes after installation because
board may be heated by handling.
The selected number is the number of degrees, plus or minus,
which will be added to actual temperature. The numbers can range
between -5 and +5.
TO SELECT:
1. Enter configuration mode if not already there (see above).
2. Use UP and DOWN buttons to make the large (now flashing)
display indicate 13.
3. Press the TIME/TEMP button once to flash the small display.
4. Use UP and DOWN buttons to move between -5 and 5 in 1
degree steps on the small display. Factory default is 0.
5. Press TIME/TEMP button again to flash the large display for
selection of another option, or press HOLD/END to exit the
configuration mode.
Step 4—Thermostat Operation
TEMPERATURE DISPLAY
Thermostat will display room temperature until UP or DOWN
button is pressed. The words SET TEMP appear when these
buttons are pressed and the current set point is displayed. If no
buttons are pressed for 5 sec, the display will change back to show
room temperature.
TIMEGUARD TIMER
A 5-minute timeguard is built into the thermostat immediately
upon power up, and any time the compressor turns off. The
compressor will not turn on until the timeguard has expired. The
timeguard affects only compressor operation. Pressing UP and
FAN buttons simultaneously will override the timeguard for 1
cycle.
CYCLE TIMER
In normal heating and cooling operation the thermostat will not
allow more than 4 equipment cycles per hour (or 1 cycle every 15
minutes). Both the Y and W outputs have a 15-minute timer that
starts counting down when the output is turned on, (e.g., if Y
output is turned on for 9 minutes and then satisfies, it cannot turn
back on for another 6 minutes regardless of demand). However,
pressing UP and FAN buttons simultaneously or changing the set
point will override the timer for 1 cycle.

MINIMUM ON TIMER

Once the equipment has turned on, it will remain on for a
minimum of 3 minutes regardless of demand. However, the
equipment can turn off in less than 3 minutes if a change in set
point, or a change in mode occurs.

STAGING TIMER

If the thermostat is a heat pump model, it has 2-stage heat
capability. In normal operation there is a 15-minute delay between
the first and second stages of heat. The Y output will energize first,
then 15 minutes later, W is allowed to come on if the thermostat
determines it is not satisfying the demand.
However, if the heating demand is greater than 5°, there will be
only a 3-minute delay before bringing on W.

ERROR MESSAGES

E4 will be displayed if the thermostat has an internal memory
failure. If E4 appears, replace thermostat. -- (two dashes) will be
displayed if the thermostat cannot properly read room temperature.
If -- appears, replace thermostat.
Step 5—Check Thermostat Operation
FAN OPERATION
1. Press FAN button. This will start continuous fan operation.
FAN ON icon will turn on.
2. Press FAN button again. This will stop continuous fan
operation. FAN ON icon will turn off.
HEATING OPERATION
1. Press MODE button until HEAT is displayed.
2. Press UP button until LCD readout reads 3° above room
temperature. Press UP and FAN buttons simultaneously to
defeat timers. Heating system should begin to operate imme-
diately.
3. For HP thermostats only, press MODE button until EMHT
(emergency heat) appears. Press UP and FAN buttons simul-
taneously to defeat timers. Emergency heating (W is ON, Y is
OFF) should begin immediately.
COOLING OPERATION
1. Press MODE button until COOL is displayed.
2. Press DOWN button until LCD readout reads 3° below room
temperature. Press UP and FAN buttons simultaneously to
defeat timers. Cooling system should begin to operate imme-
diately.
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