Honeywell PERFECT CLIMATE COMFORT CENTER User manual

169-0891—2
OWNER’S GUIDE
As an ENERGY STARSM partner, Honeywell has
determined that this product meets the ENERGY
STARSM guidelines for energy efficiency.
69-0891-2

69-0891—2 2
Congratulations! You made a smart choice when you pur-
chased your Perfect Climate Comfort Center™ Control System!
The Perfect Climate Comfort Center™ Control System is more
than just a thermostat. It keeps you comfortable by:
•Controlling temperature.
•Controlling humidity.
•Controlling indoor air quality.
From your Perfect Climate Comfort Center™ Control System
you can: —Program the fan.
—Program the ventilation.
—Select separate setting for frost control.
•Saving energy by automatically setting back the heating
or air conditioning while you sleep or when you are away
from home.
A few words about the ENERGY STARSM logo on your pro-
grammable thermostat…
The ENERGY STARSM logo on your thermostat means that it is
designed to save you money by reducing your energy bills while
improving your comfort. The logo ensures that this thermostat
meets the highest efficiency standards: accuracy maintained
within 2°F of the temperature that you set; a recovery system
that ensures desired temperatures at the time you choose;
separate weekday and weekend schedules, and a hold feature
so that you can easily override settings temporarily. The logo
also means that this thermostat is easy to use and comes with
the highest level of customer support available.
The ENERGY STARSM logo makes it easy for you to identify
products that are the most efficient for your home and the
environment. Products that reduce power consumption reduce
pollution, and earn the ENERGY STARSM designation from the
U.S. Environmental Protection Agency (EPA).

369-0891—2
Table of Contents
Features ............................................................................................... 4
Programming Your PC8900 .................................................................. 5
Setting Your Customized Program .................................................. 6
Programming the First Day ............................................................. 8
Programming the Remaining Days ............................................... 12
Operating Your PC8900 ...................................................................... 17
Changing Current Period Settings ................................................ 17
Changing Settings for One Week or Less..................................... 18
Changing Settings for Indefinite Time Period ............................... 20
Canceling Program Settings ......................................................... 21
Reviewing Program Settings and Current Readings .................... 22
Activating or Deactivating Keyboard Lockout................................ 24
Adaptive Intelligent Recovery™ ......................................................... 25
Breakthrough Technology Senses Temperatures
More Like You Do .................................................................... 25
The Optimum Comfort and Energy Savings Solution ................... 26
Control Options .................................................................................. 27
Frost Control ................................................................................. 27
Ventilation Control ......................................................................... 27
Fan Control ................................................................................... 28
Heat Mode Humidity Control (Select Models Only) ...................... 28
Cool Mode Humidity Control (Select Models Only) ...................... 28
Cool Mode with Reheat Feature (Select Models Only)................. 28
Answers to Common Questions About The PC8900 ......................... 29
Saving Energy Across the United States ........................................... 32
Glossary ............................................................................................. 34
Troubleshooting Guide ....................................................................... 36
Index .................................................................................................. 42

69-0891—2 4
Features
•Program up to four different time periods in each daily
schedule.
•Set different schedules for each day of the week.
•Monitor system operation; review current system settings at
a glance.
•System light indicates when heating or cooling equipment is
operating.
•Backlit for easy readability of display at all times.
•Temporarily set the temperature warmer or cooler.
•Select system and fan operation with separate keys.
•Program ventilation.
•Select humidity setting.
•CHECK light glows as a prompt to press CHECK key and
examine messages in CHECK LIST.
•Vacation HOLD feature allows energy savings for one to
seven days.
•Indefinite HOLD allows longer than seven days.

569-0891—2
Programming Your PC8900
First, you need to set the current day and time, as directed in
Step 1, Setting the Current Day and Time. Setting the day and
time activates the preprogram in your new Perfect Climate
Comfort Center™ Control System.
1. Setting the Current Day and Time
You can program the Perfect Climate Comfort Center™ Control
System only when it is installed on the wall and power is
connected.
NOTE: — Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
—Check the Glossary section for definitions of
unfamiliar words.
a. Press SET CLOCK. The display shows a time and day.
M6202
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SET
CLOCK
PM
MON
Period Start Time Heating Temp Cooling Temp Fan Setting Vent Setting
WAKE (6:00 AM) (70°F) (78°F) (AUTO) (OFF)
LEAVE 8:00 AM 62°F 85°F AUTO OFF
RETURN 6:00 PM 70°F 78°F AUTO OFF
SLEEP (10:00 PM) (62°F) (82°F) (AUTO) (OFF)

69-0891—2 6
b. Press and hold DAY until the current day appears in the
display.
DAY
M6203
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
PM
MON
c. Press and hold a TIME key until the current time appears
in the display. Be sure AM or PM appears as desired.
M6204
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
AM
MON
TIME
TIME
d. Press RUN to exit the SET CLOCK program mode.
M6230
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
RUN
AM
MON
You have programmed the current day and time. The prepro-
grammed schedule is now activated. You can change the
preprogrammed schedule or clear the preprogrammed
schedule and start again. Or you can use the preprogrammed
schedule as is. To change the preprogram or create a new
program, follow the steps in the Setting Your Customized
Program section. The Operating Your PC8900 section shows
you how to make any temporary changes you might want.
Setting Your Customized Program
Planning your program…
You can use the following tables to plan your schedule before
you begin programming. If you choose to change the default
settings, refer to Clearing Current Program section.

769-0891—2
The humidity setting is the same for all days and periods.
When an outdoor sensor is part of the system, enter a frost
setting that is also the same for all days and periods. See
Default Settings.
Period Start Time Heating Temp Cooling Temp Fan Setting Vent Setting
Monday
WAKE
LEAVE
RETURN
SLEEP
Tuesday
WAKE
LEAVE
RETURN
SLEEP
Wednesday
WAKE
LEAVE
RETURN
SLEEP
Thursday
WAKE
LEAVE
RETURN
SLEEP

69-0891—2 8
Programming the First Day
You can erase the entire preprogrammed schedule, or make
minor changes to the program. When you want to make only
minor changes to the program, go to step 7a. When you
choose to clear the current program (or preprogram) and start
over, proceed as follows:
NOTE: Press the RUN key at any time to exit the program-
ming mode.
Period Start Time Heating Temp Cooling Temp Fan Setting Vent Setting
Friday
WAKE
LEAVE
RETURN
SLEEP
Saturday
WAKE
LEAVE
RETURN
SLEEP
Sunday
WAKE
LEAVE
RETURN
SLEEP

969-0891—2
1. Clearing Current Program
a. Press SELECT PERIOD.
M6206
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
SELECT
PERIOD
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
MON
AUX HEAT SET PT COOL
b. Hold CANCEL until display shows PROG CLR .
M6205
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
NOTE: If you choose, you can stop now and the
PC8900 will be on HOLD permanently.
2. Setting Day, Time, and Setpoints
a. Press SELECT PERIOD until display shows WAKE .
M6206
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
SELECT
PERIOD
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
MON
AUX HEAT SET PT COOL
b. Press DAY until display shows MON .
M6207
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
MON
DAY
AUX HEAT SET PT COOL
c. When the display reads COOL SET PT , press HEAT/
COOL SETPOINTS to switch to
HEAT SET PT .
M6209
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
AUTO
FAN
WAKE

69-0891—2 10
d. Press and hold a TIME key until the display shows the
desired starting time for the WAKE period. The time
changes in ten-minute increments.
M6215
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
MON
TIME
TIME
AM
e. Press and hold the ▲or ▼arrowhead key until the
display shows the desired temperature.
M6210
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
AUTO
FAN
HEAT SET PT COOL
f. Press HEAT/COOL SETPOINTS to switch to COOL
SET PT
.
M6231
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
AUTO
FAN
WAKE
NOTE: The starting time for the WAKE period is the
same for both heating and cooling for this
particular day. When you change the time while
setting the cooling temperatures, the starting
time is also changed for heating.
g. Press and hold the ▲or ▼arrowhead key until the
display shows the desired temperature.
M6232
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
AUTO
FAN

11 69-0891—2
NOTE: — When the numbers do not move while you
are holding the ▲or ▼arrowhead key, you
have reached the setting limit (88°F and
45°F).
—When set for auto changeover, there is a
3°F automatic field-installed differential
between the heating and cooling setpoints.
(When you are in cooling with the heating
setpoint at 68°F, the cooling setpoint can be
no lower than 71°F.) And when you
program the cooling setpoint for 70°F, the
heating setpoint changes to 67°F. The
PC8900 automatically pushes the alternate
setpoint so you can adjust the setpoint to
the desired setting.
—When set for manual changeover, the 3°F
differential between the heating and cooling
setpoint does not apply.
IMPORTANT
The FAN settings are the same for heating and
cooling.
3. Setting Fan
M6213
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTO ON CIRC DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
WAKE
FAN
AUTOON CIRC
AUTO
FAN
a. Press FAN until FAN AUTO, FAN ON or FAN CIRC is
displayed, as desired, for the WAKE period.
NOTE: — AUTO means the fan only runs when your
heating or cooling is running.
—ON means the fan runs during this entire
period.
—CIRC means the fan runs at least
30 percent of the time during this period,
including when your heating or cooling
system is running.

69-0891—2 12
4. Setting Ventilator
IMPORTANT
The VENTILATOR settings are the same for heating
and cooling.
M6211
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
AUTO
FAN
WAKE VENT
a. Press VENTILATE to display VENT when increased
ventilation is desired during the WAKE period.
M6212
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
AUTO
FAN
WAKE
b. If normal ventilation is desired during the WAKE period,
press VENTILATE until
VENT is not displayed.
5. Programming LEAVE, RETURN and SLEEP
a. Repeat steps 2a through 4b for each period you want
programmed on Monday.
You have completed the PC8900 program for Monday.
Programming the Remaining Days
6. Copying the First Day Program
a. Hold down the DAY key until all the days of the week
have appeared on the display.
DAY
M6233
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
PM
SUN SLEEP

13 69-0891—2
b. Press the RUN key to save and start the program.
You have now copied your Monday program to all seven days
of the week.
7. Customizing Your Program
a. Press SELECT PERIOD to enter the programming mode.
M6234
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
SELECT
PERIOD HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
MON
AM
HEAT SET PT COOL
b. Press DAY until the day you want to change is displayed.
M6235
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
SAT
AM
DAY
HEAT SET PT COOL
c. Press and hold SELECT PERIOD until the period you
want to change is displayed.
M6236
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
LEAVE
SAT
AM
SELECT
PERIOD
HEAT SET PT COOL
d. Press HEAT/COOL SETPOINTS to switch between
HEAT SET PT and COOL SET PT .
M6237
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
AUTO
FAN
LEAVE
M6230
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
RUN
AM
MON

69-0891—2 14
e. Press and hold a TIME key until the display shows the
desired period starting time.
M6238
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
SAT LEAVE
TIME
TIME
AM
f. Press and hold the ▲or ▼arrowhead key until the
display shows the desired temperature.
M6210
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
AUTO
FAN
HEAT SET PT COOL
g. Follow steps 3a and 4a when changes to the fan and
ventilator settings are desired.
8. Canceling One Program Period
IMPORTANT
When in a program, pressing the CANCEL key for
more than three seconds (until PROGRAM CLR
appears) cancels all your program settings so you
need to begin again with step 2.
a. Press CANCEL while you are in the period you choose
to cancel. The programmed time, temperature, vent and
fan settings for that period and day will disappear.
M6226
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
WAKE
MON

15 69-0891—2
9. Starting the Program
a. Press RUN to start the program.
M6230
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
RUN
AM
MON
10. Programming the System Setting
a. Press SYSTEM until desired setting ( HEAT, OFF, COOL,
AUTO, EM. HT
.) is displayed in the LCD.
M6227
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
SYSTEM
HEAT OFF COOL
SYSTEM
HEAT :The PC8900 controls your heating system.
OFF :Both your heating and cooling systems are off.
COOL :The PC8900 controls your cooling system.
AUTO :The PC8900 automatically changes between
heating and cooling, depending on the indoor
temperature. (AUTO must be configured by the
installer.)
EM. HT .(Select Models Only): The PC8900 controls the
emergency heat and not the compressor.
11. Programming Humidity Setting
a. Press HUMIDITY. The display shows HUMID and a
percentage.
M6228
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY
HUMIDITY
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM

69-0891—2 16
b. Press and hold the up or down arrowhead key until
desired humidity setting is displayed. The available
choices range from 10 percent to 80 percent, in 5 per-
cent increments.
M6229
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
12. Programming Frost Setting (If Applicable)
a. Press HUMIDITY a second time and the display shows
FROST and a frost setting number.
M6239
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY
HUMIDITY
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
NOTE: The factory frost setting is 5, but the range is 0
to 10. When there is too much condensation on
your windows, lower the number; if the air is dry,
raise the setting to a higher number.
b. Press the up or down arrowhead key until desired
setting is displayed.
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
M6240
c. Press RUN to exit the program mode.
M6230
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
RUN
AM
MON
You have now completed setting your customized PC8900
program.

17 69-0891—2
Operating Your PC8900
Changing Current Period Settings
This feature lets you customize the program for those times
when someone comes home early, stays up late, or plans to be
out for the evening. These settings will be in effect until the next
regularly scheduled period starts or the RUN key is pressed.
1. Temperature Setpoint
a. Press HEAT/COOL SETPOINTS to display either HEAT
SET PT
(to change heat setpoint) or COOL SET PT (to
change cool setpoint).
M6209
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
b. Press and hold the ▲or ▼arrowhead key until the
desired temperature is displayed.
M6216
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
TEMPORARY
HEAT SET PT COOL FAN
AUTO
2. Fan Setting
a. Press FAN to display the AUTO, ON or CIRC fan setting
as desired.
M6221
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTO ON CIRC DAY
TIME
TIME
SYSTEM
FAN
AUTOON CIRC
AUTO
FAN

69-0891—2 18
3. Ventilation Setting
a. Press VENTILATE to display VENT or not, as desired.
M6224
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
AUTO
FAN
TEMPORARY VENT
Changing Settings for One Week or Less
This feature lets you set one temperature that the PC8900 will
hold continuously for up to one week until the day and time you
program into the PC8900. The PC8900 will then return to your
normal program at the designated time.
4. Programming Hold for 1 to 7 Days
a. Press HOLD.
M6241
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HOLD
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
b. Press HEAT/COOL SETPOINTS to display either HEAT
SET PT
(when holding heat setpoint) or COOL SET PT
(when holding cool setpoint).
M6242
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLD
HUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
HEAT/COOL
SETPOINTS
c. Press and hold the ▲or ▼arrowhead key until desired
holding temperature is displayed.
M6243
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLD
HUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL

19 69-0891—2
d. Press FAN for fan setting and VENTILATE for ventilation
setting during hold.
M6244
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTO ON CIRC DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
FAN
AUTOON CIRC
AUTO
FAN
M6245
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
AUTO
FAN
VENT
e. Press DAY until the day you want the hold to end is
displayed.
DAY
M6246
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
PM
FRI
f. Press a TIME key until the time you want the hold to end
is displayed.
M6247
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
TIME
TIME
PM
FRI
NOTE: To cancel steps 4a through 4f, press the
CANCEL key.
M6248
CHECK
SYSTEM
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
AM
MON
CANCEL
These temperature, fan and ventilation settings will be in effect
until the day and time you have selected. At that time, the
PC8900 will return to your regularly programmed schedule.

69-0891—2 20
Changing Settings for Indefinite Time Period
This feature lets you set one temperature that the PC8900 will
hold continuously until you decide to resume your preset
schedule.
5. Programming Indefinite Hold
a. Press HOLD.
M6241
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
HOLD
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT COOL SET PT
b. Press HEAT/COOL SETPOINTS to display either HEAT
SET PT
(when holding heat setpoint) or COOL SET PT
(when holding cool setpoint).
M6242
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLD
HUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
HEAT/COOL
SETPOINTS
c. Press and hold the up or down arrowhead key until the
desired holding temperature is displayed.
M6243
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLD
HUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
d. Press FAN for desired fan setting. Press VENTILATE for
desired ventilation setting during hold.
M6244
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTO ON CIRC DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
FAN
AUTOON CIRC
AUTO
FAN
M6245
CHECK
SET
CLOCK
HEAT/COOL
SETPOINTS
SELECT
PERIOD
CANCEL
HOLDHUMIDITY VENTILATE
VENTILATE
RUN
SYSTEM
HEATOFF COOL
FAN
AUTOON CIRC
DAY
TIME
TIME
SYSTEM
HEAT SET PT COOL
AUTO
FAN
VENT