White Rodgers Comfort-Set 90 User manual

1
INTRODUCTION
Thank you for purchasing
your new Comfort-Set 90
Series thermostat. Your new
White-Rodgers thermostat
uses solid state micro-
computer technology to
provide precise time/tem-
perature control. This ther-
mostat offers the flexibility
to design heating and cooling
programs that fit your needs.
Adaptable to most 24 volt
residential forced air, multi-
stage (1F95-377 or 1F95-371)
or heat pump systems with
electric or fossil fuel auxil-
iary (1F95-377 or 1F94-371).
You will find information
about thermostat buttons and
display in the component
section beginning on page 2.
Introduction Orientation Configuration Programming Features Index
Instructions for optional
thermostat configuration
begin on page 4. Program-
ming information begins on
page 7. Descriptions of the
thermostat’s features begin
on page 13.
We have also added thumb
tabs to help you find sections
of the manual.

2
ORIENTATION
THE THERMOSTAT BUTTONS
See inside front cover for illustration
showing button locations.
1(Blue arrow) Lowers temperature
setting (45°F or 7°C minimum)
2(Red arrow) Raises temperature
setting (99°F or 37°C maximum)
3The multi-color indicator glows:
green for 1st stage, yellow for 2nd stage,
red for emergency heat and flashing
red for malfunction condition in
system.
4
This button (on top of the cover)
lights the display.
5
Used to initiate or review thermo-
stat programming or advance to next
program period in programming mode.
6
Used with TIME
FWD
/TIME
BACK
to set the clock.
7
Used to adjust the time backward,
or to select the previous menu item.
8
Used to adjust the time forward, or
to select the next menu item.
9
Used with TIME
FWD
/TIME
BACK
to set the current day.
10
Used to advance operation to the
next program period or advance to the
next day in programming mode.
11
Used to manually override
programming to hold at a selected
temperature.
12
Used to enter and configure the
VACATION mode.
13
Selects fan operation (see The
Display
21
). This button is also used
to program the fan to run continuously
during a program period.
14 Used to set the filter change-out
time, or to reset the filter change timer.
15 Sets the system mode (HEATing,
EMERgency (Heat Pump models
only), OFF, COOLing, or AUTO-
matic changeover).
16
Used to adjust the clock one hour
forward or back.
17
Used to start or return to program
operation.

3
FAN AUTOHRS
CHECK BATTERY STAT SYSTEM
°F
AM
MON
PRG
FAN ON
HEATHEAT
HRS
CHECK BATTERY
°F
AM
MON WED THU FRI SAT SUNTUEWED THU FRI SAT SUNTUE
18 18
19 20 21 21
22
25
2324
Figure 1. The Display
THE DISPLAY
18 Displays system mode (HEAT,
EMER, OFF, COOL, AUTO,
HOLD, or VACA). During program-
ming displays the time period (MOR,
DAY, EVE, NHT) being pro-
grammed.. In the configuration menu,
the menu item name is shown, one
word at a time (PRGM MODE,
EMR, COOL FAN DELA OFF, etc.).
19
CHECK STAT appears when the
thermostat detects certain problems
within itself. CHECK SYSTEM
appears when the thermostat detects
certain problems in heating or cooling
the system.
20
Indicates the length of time
remaining in a temporary hold
condition. Also indicates the length of
time remaining in VACATION mode.
21 Displays FAN ON when the fan is
operating continuously. Displays FAN
AUTO when the fan cycles with the
heating or cooling system. Displays
PRG FAN ON when fan is pro-
grammed to be on during a period.
22 Displays the setpoint temperature.
23
Alternately displays room
temperature and time of day.
24 Shows the current day of the week.
When programming, shows the day(s)
being programmed.
25 The word HEAT or COOL will
appear above or below the setpoint if
area 18 is needed to display other
information.
Orientation

4
The configuration menus allow you to
set certain thermostat operating
characteristics to your system or
personal requirements.
To enter the User Configuration menu,
press PROGRAM
RUN
to make sure
the thermostat is in the run program
mode, then press TIME
FWD
and
TIME
BACK
at the same time. The
display will show the first item in the
configuration menu.
The following charts (pages 5 & 6)
describe each item on the menus. Press
TIME
FWD
to move forward to the
next item in the menu or TIME
BACK
to move backward to the previous
item. Set these according to your
personal preference using or
. To enter the Keypad Lock
menu, while in the User Menu, press
and hold TIME
FWD
and TIME
BACK
for at least two seconds.
To exit either menu and return to
normal operation, press PROGRAM
RUN
. To re-enter to the User menu at
any time press PROGRAM
RUN
,
then press TIME
FWD
and TIME
BACK
at the same time. While in the
menus, if you do not press any buttons
for two minutes, the thermostat will
revert to normal operation.
CONFIGURATION

5
1
Step Press Button(s) Displayed Press or to select: COMMENTS Ref
(Factory Default) Page
0 °F
(room temperature) 5 LO to 5 HI
2EMR
(ON) OFF or ON L
Adjusts temperature display higher or lower.
3(°F) °C
Adjusts temperature display to °F or °C.
4SET FAN
(0) 0 - 6 HRS
5BEEP
(ON) OFF
6HEAT FAST
(OFF) ON
7COOL FAST
(OFF) ON
8TEMP OUT
(OFF) ON
Enables outdoor temperature sensor. Requires
optional remote sensor connected to terminal OT
and remote thermistor probe.
Selects EMR option ON or OFF or L ON.
Set Fan (one shot) option. Set the duration of a
temporary fan option.
Turns keypad beeper ON or OFF.
OFF delays starting second stage for economy.
ON eliminates delay to energize second stage.
OFF delays starting second stage for economy.
ON eliminates delay to energize second stage.
TIME
and TIME
at same time
for 2 seconds
FWD
BACK
TIME
FWD
TIME
FWD
TIME
FWD
TIME
FWD
TIME
FWD
TIME
FWD
TIME
FWD
User Menu
Configuration
13
13
14
14
14
14
14
14

6
9FONE (Icon)
(OFF) ON
10 COMP RUN TIME
(00) (Compressor run time in hours)
12
Returns to normal operation.
11 AUX RUN TIME
(00) (AUXILIARY run time in hours)
Telephone RUN program feature. Requires optional
X10 system.
Shows accumulated time compressor has run.
To reset to 00, press and .
Shows accumulated time AUXILIARY has run.
To reset to 00, press and .
PROGRAM
RUN
TIME
FWD
TIME
FWD
TIME
FWD
1
Step Press Button(s) Displayed Press or to select: COMMENTS Ref
(Factory Default) Page
PART LOCK
(OFF) ON
2LOCK
(OFF) ON
Partial Keypad lockout OFF or ON.
3
Returns to normal operation.
Total Keypad lockout OFF or ON.
PROGRAM RUN
TIME
and TIME
(hold for two
seconds)
FWD
BACK
TIME FWD
Keypad Lockout Menu (access from User Menu)
User Menu (Continued)
15
15
15
15
15

7
PROGRAMMING
MANUAL OPERATION
Your Comfort-Set III thermostat can be
used to control temperature manually
(without programming). For manual
operation, press
SYSTEM
to select
HEAT or COOL, then press PRO-
GRAM
HOLD
. Use or to
set the temperature as desired.
PROGRAMMED OPERATION
Planning Your Program
The sample schedule (page 9) shows
the factory installed programs for
heating and cooling. The heating and
cooling programs are separate, and
must be programmed individually. To
use the factory program, set the clock
and press PROGRAM
RUN
with the
thermostat
SYSTEM
set to Heat, Cool,
or Auto.
Fill out the blank schedule (page 10)
with the time and temperatures you
want in your program. Fill in every
space for your program.
The same temperature can be repeated
more than once if you do not want the
temperature to change over several
time periods.
Entering Your Program
To Set the Clock:
1. Press PROGRAM
RUN
.
2. Press SET
TIME
. The display will
show the hour. Use TIME
FWD
or
TIME
BACK
to set to the current hour
and AM/PM designation.
3. Press SET
TIME
again. The
display will show minutes. Use TIME
FWD
or TIME
BACK
to set to the
current minutes.
4. Press PROGRAM
RUN
.
To Set the Day:
5. Press SET
DAY
. The display will
indicate a day of the week. Use TIME
FWD
or TIME
BACK
to set to the
current day of the week.
6. Press PROGRAM
RUN
.
To Set the Program:
7. Press
SYSTEM
to select HEAT (for
heating program) or COOL (for
cooling program).
8. Press PROGRAM
VIEW
one time.
The display will show MOR, the
settings for time and temperature and
MON.
9. If you program Monday the first
time you press PROGRAM
VIEW
it
will be copied to the rest of the week.
To program the other days of the week
press
ADV.
/DAY to until you reach
the day you wish to change and follow
Programming

8
Steps 10, 11 & 12. You can also copy
the program from one day to another.
To copy, press
HOLD
/COPY. The
display will show COPY, and all the
other days of week will be flashing.
Press
HOLD
/COPY again to copy the
day in to the rest of the week or press
TIME
FWD
or TIME
BACK
until
you reach the day you want to copy to
and press
HOLD
/COPY.
10.Press TIME
FWD
or TIME
BACK
to set the time on the display as
selected in your HEATING or
COOLING SCHEDULE. Be sure to
check the AM or PM on the display.
11.Press the red or blue
key to adjust the temperature to match
your schedule. If you want the fan ON
continuously during this period, press
FAN
.
12.Press PROGRAM
VIEW
one time.
MOR on the display will change to
DAY. Repeat steps 10 and 11 to enter
time and temperature for this period.
13.Press PROGRAM
VIEW
to
continue through the entire schedule,
entering time and temperature for each
period. When you are satisfied that
your program matches your schedule,
press PROGRAM
RUN
. Program-
ming is now complete for this mode
and your program is running.
14.To program the other mode, repeat
the procedure from step 6.

9
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM 10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
62°F (16°C)
MON
TUE
WED
THU
FRI
SAT
SUN
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
6:00 AM 70°F (21°C) 8:00 AM 70°F (21°C)
1
5 6 5 6 5 6 5 6
2 3 4
Programming
1Morning (MOR)
2Day (DAY)
3
Evening (EVE)
4Night (NHT)
5Start Time
6
Temperature
7-Day Sample HEAT Program Schedule
(Shows factory programming)

10
82°F (27°C)
82°F (27°C)
82°F (27°C)
82°F (27°C)
82°F (27°C)
82°F (27°C)
82°F (27°C)
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM
5:00 PM 10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
10:00 PM
85°F (29°C)
85°F (29°C)
85°F (29°C)
85°F (29°C)
85°F (29°C)
85°F (29°C)
85°F (29°C)
MON
TUE
WED
THU
FRI
SAT
SUN
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
6:00 AM 78°F (25°C) 8:00 AM 78°F (25°C)
1
5 6 5 6 5 6 5 6
2 3 4
1Morning (MOR)
2Day (DAY)
3
Evening (EVE)
4Night (NHT)
5Start Time
6
Temperature
7-Day Sample COOL Program Schedule
(Shows factory programming)

11
7-Day Personal HEAT
Program Schedule
1
Morning (MOR)
2
Day (DAY)
3Evening (EVE)
4
Night (NHT)
5
Start Time
6Temperature
MON
TUE
WED
THU
FRI
SAT
SUN
1
5 6 5 6 5 6 5 6
2 3 4

12
7-Day Personal COOL
Program Schedule
MON
TUE
WED
THU
FRI
SAT
SUN
1
5 6 5 6 5 6 5 6
2 3 4
1Morning (MOR)
2Day (DAY)
3
Evening (EVE)
4Night (NHT)
5Start Time
6
Temperature

13
the room temperature (65°F) and the
setpoint (70°F) is 5°. 5°X 8 minutes
per °F = 40 minutes. The setpoint on
the display will actually change to
display 70°about 40 minutes early.
The maximum time the thermostat can
start early in heating is 75 minutes (or
3 hours, 45 minutes if EMR ON L is
selected). The maximum time in
cooling and heat pump applications is
3 hours and 45 minutes. Cooling or
heat pump applications start earlier
because it takes longer to reach the
desired temperature. This feature also
minimizes the use of the auxiliary
stages if conditions are such that the
compressor stages are adequate to
reach the desired setpoint.
To select or deselect this feature, refer
to the CONFIGURATION section
(page 5, item 2).
CONFIGURATION MENU FEATURES
Adjustable Temperature Display.
(User menu, Item 1) The room
temperature display can be adjusted to
read higher or lower by following the
User menu and adjusting the tempera-
ture to a higher or lower value. The
thermostat is calibrated at the factory
to display a very accurate room
temperature, but due to various
conditions and/or personal preference,
you may wish to adjust the thermostat
display higher or lower (up to 5°F).
For example, if the thermostat displays
a room temperature of 70°but you
want it to display 73°, you can adjust
it. To adjust, refer to the CONFIGU-
RATION section (page 5, item 1).
Selectable Energy Management
Recovery (EMR).
(User menu, Item 2) EMR causes the
thermostat to start operating the system
early in order to make the building
temperature reach your program
setpoint at the time you specify. In
multistage heating, the thermostat will
start 8 minutes early for every 1°F
difference between the room tempera-
ture and the next programmed
temperature. In cooling and heat pump
applications, the thermostat uses 15
minutes per °F. For heating applica-
tions in large buildings where extra
time to reach the set temperature may
be desired, EMR Long may be
selected. When EMR ON L is selected
in the user menu (page 5, item 2) the
thermostat uses 15 minutes per °F.
EXAMPLE: If the temperature in the
room is 65°F and the thermostat is
programmed for 70°F at 7 AM, the
thermostat will start approximately 40
minutes early. The difference between
FEATURES
Features

14
Fahrenheit or Celsius Tempera-
ture Display.
(User menu, Item 3) This thermostat
is factory set to display temperature in
Fahrenheit. If you prefer, you may
configure the thermostat to display
Celsius. See the CONFIGURATION
section (page 5, item 3).
Single Period Fan Control.
(User menu, Item 4) This feature
allows you to have the fan run for a
predetermined period of time by
pressing the FAN key twice within 1.5
seconds. If a time is set in the User
menu (page 5, item 4) the display will
show FAN, # hrs and PRG FAN ON
for six seconds. After six seconds the
display will continue to indicate PRG
FAN ON for the time period selected.
After this time period, the fan will
return to normal operation. To return
the fan to normal operation before the
end of the time period, press the FAN
key.
Beeper on.
(User menu, Item 5) The thermostat
has a beeper that will emit a tone when
any key is pressed. In the user menu,
the BEEP feature can be turned OFF
using or to provide silent
key operation.
Heat Fast.
(User menu, Item 6) This feature,
when set to ON, will bring the second
stage of heating on any time you
manually raise the temperature three or
more degrees above room temperature.
If Heat Fast is set to OFF, the thermo-
stat will delay the second stage from 0
to 30 minutes based on how well the
first stage is keeping up with your
setting.
Cool Fast.
(User menu, Item 7) This feature,
when set to ON, will bring the second
stage of cooling on any time you
manually lower the temperature three
or more degrees below room tempera-
ture. If Cool Fast is set to OFF, the
thermostat will delay the second stage
from 0 to 30 minutes based on how
well the first stage is keeping up with
your setting.
Outdoor Temperature Sense.
(User menu, Item 8)A remote sensor
(F1451378) may be installed for
outdoor temperature measurement. The
sensor must be properly connected and
enabled using the User menu. The
display shows the outdoor temperature
from -40°to 140°F by pressing the
light button twice within one second
when the thermostat is in program run
or hold mode.

15
keypad to prevent unauthorized
tampering with the program. Two
levels of security are available, Total
Keypad Lockout or Partial Keypad
Lockout. Total Keypad Lockout
renders all buttons inoperative. Partial
Keypad Lockout allows only the
or to operate for temporary
temperature overrides. It also limits the
temperature to the maximum heating
and minimum cooling temperatures
used in your program. This is espe-
cially useful in buildings where
unscheduled events are common.
Anyone can change the temperature,
but only between the temperatures you
set and only for the number of hours
you specify if you set up your Hold
Till timing (see “Temporary Program
Override” (page 17). To select or
deselect this feature, refer to the
CONFIGURATION section (page 6,
Keypad Lock menu).
Activate RUN PRG by Telephone.
(User menu, Item 9) With the
optional X-10 Telephone Responder,
Model TR551, and Universal Low
Voltage Module, UM506, installed,
you can make a telephone call to run
your program if the thermostat has
been set to Hold or Vacation Hold.
These optional items are available
from Radio Shack.
Compressor Run Time.
(User menu, Item 10 and 11) You can
see how long the compressor has run
(in hours) by viewing the User table,
Item 10. You can see how long the
system Auxiliary has run (in hours) by
viewing the User table, Item 11. These
can be reset to 00 when displayed by
pressing and at the same
time.
Keypad Lockout.
(Keypad Lockout table) This security
feature allows you to lock out the
TRADITIONAL FEATURES
Automatic Changeover.
If you have a heating/cooling system,
the thermostat can be set to automati-
cally switch the system between
heating and cooling as needed. To set
your thermostat to this operating mode,
press
SYSTEM
button until AUTO is
displayed on the screen.
Factory Preprogrammed Times
and Temperatures.
This thermostat has been programmed
at the factory. The chart in the
programming examples section lists
these factory settings. If the times and
temperatures are the same as your
schedule, you may simply run the
factory installed program by pressing
PROGRAM
RUN
.
Compressor Short-Cycle
Protection.
Your thermostat is designed to protect
your system against premature
Features

16
compressor failure by “locking out”
the compressor. This ensures that the
compressor will stay off for approxi-
mately five minutes between cycles.
When the thermostat is in compressor
lock-out, the word COOL will flash.
During this period, the compressor will
not be energized
Programmable Fan Control.
This feature allows you to have your
fan operate continuously through one
or more programmed time periods.
This is useful if you want to have
constant air circulation during a
specific time period. If you do not use
this feature, the fan will cycle normally
with the heating and cooling system.
To program the fan, follow the steps in
the PROGRAMMING section. In each
time period, you can press the FAN
key to select a continuous fan or a
normally cycling fan. The display will
show PRG FAN ON when continuous
fan is selected. This means at the time
you set the period to start, the fan will
come on and run continuously until the
next program time period
Example: Your thermostat is pro-
grammed with the original factory
settings for the Monday MOR period
in the heating mode.
Pressing PROGRAM
VIEW
will
display MOR,6AM and 70. Pressing
the FAN key will toggle the program-
mable fan ON and a second press
would turn it back OFF. When PRG
FAN ON is in the upper right of the
display, your thermostat is pro-
grammed to adjust the temperature to
70°at 6AM and also bring the fan on
to run constantly until the next
program time period.
At the next time period you may
choose to continue the program fan
feature. Change to the next program
period and press the FAN key until
PRG FAN ON is on the display. The
fan will continue to run through this
period as well as the previous one.
If the thermostat is in a period with
continuous fan and you want the fan to
cycle, press the FAN key. PRG FAN
ON on the display will turn off.
Air Filter Change-Out Indicator.
This feature allows the thermostat to
display CHNG FLTR (change filter)
after a set time of fan operation. This is
a reminder to change or clean your air
filter. The factory set interval for
CHNG FLTR to be displayed is 200
hours of fan operation. This can be set
anywhere from 0 to 1950 hours in 25
hour increments. A selection of 00 will
cancel this feature.
When CHNG FLTR is displayed, you
can clear it by pressing the FILTER
key. This resets the timer and starts
counting the hours until the next filter
change.

17
contact the manufacturer of your
heating/cooling equipment.
System and Thermostat Diag-
nostics.
The display will indicate CHECK
SYS if the room temperature does not
rise within two hours of the call for
heat. After two hours the thermostat
will quit calling for heat for one
minute (this allows some furnaces to
reset) and call for heat again. It will
repeat this sequence three times. If the
temperature still does not rise, it will
continue to call for heat. This normally
indicates the heating system is not
working correctly. You may wish to
consult your furnace manufacturer or
service person.
The display will indicate CHECK
STAT if one of the following occurs.
• One of the keys is stuck down or in.
Check the keys, make sure nothing is
pushing them in.
The following steps will allow you to
change the number of hours for filter
change-out.
1. If CHNG FLTR is on the display,
press the FILTER key once to reset
the timer. If you do not see CHNG
FLTR proceed to step 2.
2. Press the FILTER key, The display
will show SET FILTER TIME and the
number of hours remaining before
CHNG FLTR indicator will display.
3. Press the FILTER key a second
time. The display will show SET
FILTER TIME and will show the
number of hours to filter change.
4. Press TIME
FWD
or TIME
BACK
to change the time to your require-
ments.
5. Press PROGRAM
RUN
to return
to the normal operating mode.
NOTE: If unsure what interval to use
between filter changes or cleaning,
• The thermostat sensor is not
functioning. If using a remote sensor,
check connections, wiring and power.
Refer to remote sensor installation
instructions
After checking the above, press
PROGRAM
RUN
to reset the
display. If this does not clear the
display, disconnect power for five
minutes.
If these checks fail to solve the
problem, the thermostat should be
replaced.
Temporary Program Override.
Any time your program is running and
you would like to override it for a
specific amount of time, press
or until the temperature you
want is displayed. The display will
indicate HOLD, and the number of
hours remaining in the hold period will
be indicated with the word HRS. To
adjust the length of time for the
Features

18
override, press TIME
FWD
or TIME
BACK
. HOLD TILL will be displayed
as well as the HOLD period expiration
time. Press the TIME
FWD
or TIME
BACK
keys until you reach the time
you would like it to resume the
program. The TIME
FWD
or TIME
BACK
keys adjust the time in 15
minute increments. This programmed
hold time has a 19 hour maximum.
Beyond 19 hours you may wish to use
the vacation hold feature (page 18). If
you need to, you can adjust the
temperature up or down.
Indefinite Program Hold.
If you want to operate the thermostat
to keep a set temperature without a
program running, press PROGRAM
HOLD
. The or keys can
be used to raise or lower the tempera-
ture. The thermostat will hold the set
temperature until you return to the
program by pressing PROGRAM
RUN
.
Programmable Vacation Time/
Temperature Operation.
The VACATION key allows you to
program the thermostat to hold a
constant temperature for 1 to 29 days.
At the end of the day and time you
select, the thermostat will return to
normal program operation.
To program the number of days, press
VACATION. VACA HOLD TILL will
be displayed. The display will also
show DAYS (flashing) and the number
5 to indicate the factory default of a 5
day period. To change the number of
vacation days, press TIME
FWD
or
TIME
BACK
. Press or to
set the temperature you wish to
maintain while away. While still in the
vacation mode, set the time you want
the program to resume by pressing
SET
TIME
once. The current time will
display. Press TIME
FWD
to adjust
the time in 15 minute increments. You
may wish to select a few hours in
advance of your expected return to
allow time to reach the desired
temperature. Your thermostat is now
programmed to hold the temperature
you selected through your vacation for
HEAT, COOL, or AUTO.
After 20 seconds the display will
return to time/temperature alternation,
and will display VACA. Pressing
VACATION again will activate the
vacation mode settings. Pressing
PROGRAM
RUN
cancels this
feature and begins running your
normal program.
Optional Remote Temperature
Sense.
Up to three remote sensors (F145-1328)
can be attached to this thermostat to
sense indoor temperature at locations
away from the thermostat. Each sensor
may be located as far as 200 feet away
from the thermostat. This is an
excellent feature if the thermostat is in

19 Features
a poor location for sensing temperature
or if you want to install the thermostat
in a separate room to prevent tamper-
ing. After installing and connecting the
remote sensor(s) to the thermostat, the
installer can enable each remote indoor
temperature sensor (A, B, and/or C).
When operating with remote sensor(s),
the thermostat will calculate an
average of the sensed temperatures in
all enabled sensor locations (A, B, C
and/or L), then display the average
temperature as the room temperature.
The temperarure at each remote sensor
can be displayed by pressing the light
button twice within one second. with
the thermostat in program run or hold
mode. Temperatures at the outdoor and
indoor remote sensors will be displayed
with subsequent presses of the light
button in the following order (if
connected): outdoor sensor, sensor L,
A,B, C.
You can also assign each sensor
different priorities during different
program periods. This allows the
system to maintain a comfortable
environment by giving higher priority
to occupied locations. At the same
time, efficient system operation is
enhanced by giving lower priority to
unoccupied locations.
EXAMPLE: Your home has bedrooms
on the upper level and a guest bedroom
on the main level, along with the living
room, kitchen, etc. The thermostat
(sensor L) is located in the hall on the
main level. Remote sensors are located
on the upper level (sensor A) and the
guest bedroom (sensor B). The lower
level would be occupied in the DAY
and EVE periods. The upper level
would be occupied in the NHT and
MOR periods. With no guest in the
guest bedroom, the sensors could be
programmed as follows:
MOR AVG HI LO
DAY HI AVG LO
EVE HI AVG LO
NHT AVG HI LO
SENSOR
LAB
In the MOR and NHT periods, the
sensor on the upper level (sensor A)
has more priority than the lower level
(sensor L), so the system will operate
to keep the temperature at the set point
in the upper level. In the DAY and
EVE peroids, the lower level has the
higher priority, so the system will
operate to keep teh temperature at the
set point on that level. The sensor in
the guest bedroom has the lower
priority of the sensors. If there is a
guest, the sensor in that room (sensor
B) should be changed to AVG or HI for
periods when that room will be used.,

20
To assign priority to a sensor, press
PROGRAM
VIEW
and
ADV.
to
select the period, then press the
VACATION key. On the display in
place of OCCU or UNOC the priority
of the sensor and the sensor identifica-
tion will appear. Press the VACATION
key to step through the sensors that are
installed and enabled L(local), A, Bor
C. Only sensors that are installed and
enabled will be listed. When the sensor
you wish to change is displayed, press
the DAYLIGHT SAVING TIME key
to change the priority (AVG, HI or
LO). AVG is the default setting.A
setting of HI gives a sensor more
importance and a setting of LO gives
less importance.
Daylight Savings Time Button.
One button adjustment allows you to
change your thermostat clock between
Standard Time and Daylight Savings
Time. Simply push the DAYLIGHT
SAVINGS TIME key to advance the
time forward one hour in the Spring. In
the Fall press the DAYLIGHT
SAVINGS TIME key twice to fall
back an hour. If you push it three times
in a row (in less than 30 seconds) it
will return to the original time setting.
After clock adjustment, press PRO-
GRAM
RUN
to resume your normal
program.
Large Lighted Liquid Crystal
Display (LCD).
The large numbers and letters on your
LCD screen make it easy to see. In low
light conditions, press the button on
top of the thermostat and the display
will light up for three seconds. For ten
minutes after pressing the light button,
pressing any other button will light the
display for ten seconds.
The thermostat display alternately
shows the current time and the current
temperature on the left side. The
display also shows the temperature you
have programmed or set on the right
side of your screen.
Arm Chair Programming.
The thermostat uses 24 VAC power
supplied by the system for normal
operation. The electrolytic capacitor
allows you the added convenience of
programming the thermostat even
when not attached to the wallplate,
Attach the thermostat to the wallplate
and allow the capacitor to charge for at
least one hour. After the capacitor is
charged you will have approximately
one hour after removing the thermostat
from the wallplate to configure and
program the thermostat.
Thermostat Startup After Total
Power Loss.
On installation, or when power is
restored after a total power loss to the
thermostat, your thermostat will