Fan Operation - Carrier Programmable Dual Fuel Thermostats Installation, Start-Up, And Operating Instructions Manual

Improper wiring or installation may damage the thermostat.
Check to make sure wiring is correct before proceeding with
installation or turning on unit.
9. Push any excess wire into wall and against mounting base.
Seal hole in wall to prevent air leaks. Leaks can affect
operation.
10. Snap hinge back together.
11. Close thermostat assembly making sure pins on back of circuit
board align with sockets in connector.
12. Turn ON power to unit.
On power up, display shows dF for a few seconds to indicate that
it is a dual fuel thermostat.
Step 4—Set Thermostat Configuration
Configuration options, like DIP switch settings, are intended to be
selected at installation and normally are not modified by the
homeowner. These options are not discussed in the homeowner's
manual and therefore must be made as part of the installation. A
special procedure allows entry into the configuration mode. The
thermostat will automatically exit this mode if no button is pressed
for 10 seconds. While in configuration mode, 4 option choices can
be made:
1. Fahrenheit or Celsius—Selection.
2. Balance point—Value Adjustment
3. Clean filter timer—Selection and Value Adjustment.
4. 'Anticipator'—Value Adjustment.
An explanation for each of these and how to enter the configura-
tion mode follows.
To enter the configuration mode:
Press and hold FAN button for approximately 10 sec until room
temperature disappears and display reads "--". You are now in the
configuration mode.
NOTE: If no button is pressed for 10 sec, thermostat will exit
mode and resume normal operation. To re-enter configuration
mode, FAN button must be pressed and held again.
While in Configuration Mode, these selections are available:
Fahrenheit or Celsius—Selection
Select between Fahrenheit or Celsius operation. Factory default is
Fahrenheit.
TO SELECT:
1. Enter configuration mode.
2. Press CHANGE DAY button to display F or C.
3. Use either up or down button to change between F and C.
Balance Point—Value Adjustment
This adjustment allows installer to enter an outdoor temperature
below which HP will not be allowed to operate. Temperatures
between 15˚F and 55˚F can be selected in 5˚F steps. (Equivalent
values are used when Celsius operation is selected.) A discussion
of how to determine this temperature was provided earlier in the
APPLICATIONS section.
TO SELECT:
1. Enter configuration mode.
2. Press COPY PREVIOUS DAY button.
3. Use up or down buttons to move between 15, 20, 25, 30, 35,
40, 45, 50, and 55˚F (or equivalent values in ˚C).
Clean Filter Timer—Selection and Adjustment
Select hours of blower operation before CLEAN FILTER icon is
displayed. Timer accumulates total blower hours. Selection can
range from 400 to 3600 hours or can be turned off. Factory default
is 2 (800 hours). Recommended selections are: disposable
filter—400 to 800 hours, media filter—1200 to 1600 hours, or
electronic air cleaner—1600 to 2400 hours of blower operation.
TO SELECT:
1. Enter configuration mode.
2. Press RESET FILTER button to display OF (off) or digits 1
through 9.
3. Use up and down buttons to move between selections. Total
hours equals 400 times the displayed number. OF (off) turns
feature off.
4. During the selection process, the CLEAN FILTER icon will
remain on, even if OF (off) is chosen.
'Anticipator'—Adjustment
This adjustment controls the sensitivity and cycle rate of the
thermostat. Higher numbers decrease the sensitivity and slow the
cycle rate. Lower numbers increase sensitivity and increase 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 9. Default is 3. This default selection will provide
optimum performance in nearly all installations. Try it first. Do not
change setting unless there is evidence of need to do so.
Unlike conventional anticipators, this setting is not to be deter-
mined by current draw. There is no need to measure, know, or
compensate for current. There is also no 'droop' with this
thermostat, regardless of 'anticipator' setting.
This adjustment controls only sensitivity and cycle rate—up to the
maximum of 4 cycles per hour.
TO ADJUST:
1. Enter configuration mode.
2. Press MODE button to display value between 1 and 9. Factory
default is 3.
3. Use up and down buttons to move between values.
Step 5—Hold, Fan, Mode Button Operation
1. Pressing HOLD button disables the time/temperature schedule
and "holds" the current desired temperature. When active, the
HOLD annunciator is turned on. A second press of the HOLD
button releases the hold feature and turns off the annunciator.
2. Pressing the FAN button alternately selects AUTO or ON fan
operation. Fan annunciator displays the current selection.
3. Pressing the MODE button will select OFF, HEAT, COOL,
AUTO, or EHEAT. Mode annunciator displays the current
selection.
4. Operation of other buttons is explained in the Homeowner's
Guide.
Step 6—Check Thermostat Operation
SELECT HOLD
1. Press HOLD button to select "hold" feature. This will prevent
the setpoint from changing until the desired time/temperature
schedule is entered.

FAN OPERATION

1. Press FAN button, starting fan operation. Fan annunciator
switches from AUTO to ON.
2. Press FAN button, stopping fan operation. Fan annunciator
switches from ON to AUTO.
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