White Rodgers 1F91W-71 User manual

OPERATION GUIDE
Multi-stage Electronic Digital
Thermostat
1F91W-71
WHITE-RODGERS
Operator: Save this booklet for future use!

2
Pleasereadthismanualthoroughlybeforeoperatingorprogrammingyourthermostat. Ifyouhave
questions, you may write to our Technical Service Department at the address shown on the back
cover of this booklet.
About Your New Thermostat . . .
Your new Digital COMFORT SET II Multi-stage Thermostat uses the technology of a solid-state
microcomputer to provide precise time/temperature control. The COMFORT SET II Thermostat
offers you the flexibility to design heating and cooling programs that fit your needs.

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In This Guide . . .
YOUR NEW THERMOSTAT'S
FEATURES ........................................... 4
OPERATING YOUR THERMOSTAT ........ 5
PARTS OF THE THERMOSTAT
The Back Of the Thermostat Body
The Display
The Thermostat Buttons
OPERATING FEATURES
PROGRAMMING YOUR
THERMOSTAT ................................... 17
PLANNING FOR YOUR NEEDS
ENTERING YOUR PROGRAM
Set Current Time and Day
Enter Heating Program
Enter Cooling Program
CHECK YOUR PROGRAMMING
QUESTIONS AND ANSWERS................ 28
Operator: Save this
booklet for future use!

4
• Computed Energy Management Recovery
(EMR)
• Automaticchangeover(operatorselectable)
• Five-day/two-day programming capability
• Simultaneous heat and cool program stor-
age
• Preprogrammed temperature control
• Four separate time and temperature set-
tings per 24-hour period
• Armchair programming capability
• Audioandvisualpromptingduringprogram-
ming
• Programmable blower control
• Two hour temperature override
• Manual program override (HOLD tempera-
ture)
• "Advance Program" button
• Backlit LCD displays continuous setpoint,
time, and room temperature
• Adjustable cycle times
• 9 volt Energizer®alkaline battery backup
• Compressor short cycle protection
• Blower delay in the cooling cycle
• Up to three stages of heat and up to two
stages of cool
• Temperature range 40°to 99°F
•°F/°C convertibility
• Compatible with Remote Sensor (optional)
YOUR NEW THERMOSTAT’S FEATURES

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Before you begin programming your new ther-
mostat, you should be familiar with its features
andwiththedisplayandthelocationandopera-
tion of the thermostat buttons. The information
inthissectionwillhelpyoubecomefamiliarwith
yourthermostat sothat youcan easilyprogram
it.
Your thermostat consists of two parts: the
thermostat body and the subbase.
Remove power from the system at the
circuit breaker/fuse box before remov-
ing or attaching the thermostat body.
Equipment damage and/or personal in-
jury could occur.
OPERATINGYOURTHERMOSTAT
CAUTION
!
Thesubbaseisattachedtothewall,butyoucan
remove the thermostat body for easy program-
ming. To remove the thermostat body from the
subbase, grasp the thermostat body and gently
pull it out from the bottom of the subbase, then
pivotup. Toattach the thermostatbody, line up
thefourterminalpinsontheuppersectionofthe
thermostatbackwiththematchingconnectoron
the subbase. Insert these, then gently pivot the
thermostat body down to connect the nine pin
connectors on the lower portion of the thermo-
statback. Gentlypushuntilthesnapconnectors
engage. DONOTFORCEORPRYTHETHER-
MOSTAT, as this may damage the unit.

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PARTS OF THE THERMOSTAT
The Back of the Thermostat Body
Turnthethermostatbodyover. Onthebackare
the 9 volt Energizer®alkaline battery and the
option switches.
1. The 9 volt Energizer®alkaline battery pro-
vides power to the thermostat when the
24 VAC power is interrupted (for example,
when you remove the thermostat from the
wall for programming). A fresh battery will
maintain the stored program for approxi-
mately one week. If power loss is long
enough for the program to be lost, the ther-
mostat will automatically maintain a factory
preprogrammedheatingtemperatureof64°F
and a cooling temperature of 82°F after
powerisrestored. Youmust reprogramthe
thermostat if this happens.
If the word BAT is flashing in the display
window, the battery is low and should be
replacedwithafresh9voltEnergizer®alka-
BACK OF THERMOSTAT BODY
Option switches 9-pin connector
4-pin connector Battery

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line battery. The battery will provide power
for all functions except the display light and
audioprompting,whichworkonlyon24 VAC
power. If the word BAT is displayed con-
tinuously (non-flashing), the thermostat is
not being supplied with 24 VAC power and
is being powered by the battery alone.
Before removing thermostat from the
wall to replace the battery, remove
24 VACpowerfromthethermostatatthe
breaker/fuse box.
2. You may adjust option switch #4 for auto-
matic changeover from heating to cooling
(see OPERATING FEATURES).
CAUTION
!

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Other than and , the buttons are
locatedbehindthethermostatdoor. Toopenthe
door,useyourfingernailintheindentationatthe
top center of the door. Pull the door out, then
swing the door down on its hinges.
Following are brief descriptions of the display
and the thermostat buttons.
The Display
Continuouslydisplayssystemmode(HEAT,
OFF,COOL,AUTO,HOLD). During pro-
gramming, the program period is displayed
(MOR, DAY, EVE, NHT).
Alternately displays room temperature (F
denotesdegreesFahrenheitandCdenotes
degrees Celsius) and time of day (Ade-
notes AM time and Pdenotes PM time).
Displays the setpoint temperature.
5DAY indicatesthatthedisplayedprogram
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.
The word BAT flashes on the display when
the9voltalkalinebatteryisweakandshould
be replaced.
FAN is displayed when the blower is
operating continuously, regardless of heat-
ing or cooling system cycling. FAN is
displayed during automatic fan operation
(when the blower cycles with the heating or
cooling system).
1
2
3
4
5
6

9
1 2 3
466
2 DAY 5 DAY
2
3
54
FAN FANBAT
5 DAY FAN
VIEW
PRGM
ADV
PRGM
FAN
ON - AUTO
HOLD
TEMP
RUN
PRGM
SET
CLOCK
SET
DAY
SYSTEM
HEAT - OFF - COOL - AUTO
TIME
FWD
TIME
BACK

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The Thermostat Buttons
Sets the system mode (HEATing, OFF,
COOLing,orAUTOmaticchangeover[user
selectable feature]).
Selectsfanoperation(see#6,above). This
buttonisalsousedtoprogramthefantorun
continuously during a program period.
Runs display forward or backward through
time, day, or anticipation settings during
programming.
Used in conjunction with
TIME
FWD
and
TIME
BACK
to
set current time and day of the week.
Used during programming to set the day of
the week. Also used in conjunction with
SET
CLOCK
to enter anticipation setting mode.
Used to initiate or review thermostat pro-
gramming.
Used to start program operation after pro-
gramming. Also used to return thermostat
to program operation after being in HOLD
mode.
Used to manually override programming to
holdataselectedtemperature(whenHOLD
is displayed).
Usedtoadvancethermostatprogramtothe
next program period (for example, from the
MOR program to the DAY program).
(Bluearrow)Lowerstemperatureset-
ting (40°F or 4°C minimum).
(Red arrow) Raises temperature set-
ting (99°F or 37°C maximum)
The red light is on when the 1st stage
heating/cooling system is operating. The
yellow light is on when the 2nd or 3rd stage
heating/cooling system is operating.
7
8
10
11
12
13
14
17
18
16
15
9

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10 11 12 13 14 15
16 17 18
9
7
8
5 DAY FAN
VIEW
PRGM
ADV
PRGM
FAN
ON - AUTO
HOLD
TEMP
RUN
PRGM
SET
CLOCK
SET
DAY
SYSTEM
HEAT - OFF - COOL - AUTO
TIME
FWD
TIME
BACK

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OPERATING FEATURES
Now that you are familiar with the thermostat
displayand buttons,read thefollowing informa-
tion to learn about the many features of the
thermostat.
•COMPUTED ENERGY MANAGEMENT
RECOVERY (EMR) - The thermostat's mi-
crocomputer automatically calculates the
timeitwilltaketochangethetemperatureto
the next program setting. Then the thermo-
stat will activate the heating or cooling sys-
tem to change the temperature so that the
desired temperature is reached at the be-
ginning of the next program period. As an
example of this feature, assume that you
have programmed your thermostat to pro-
vide an overnight heating temperature of
62°F, and that during the next program
period, beginning at 6:00 AM, you have
programmed a temperature of 70°F. The
thermostat will automatically activate the
heating system at about 5:00 AM, so that
the programmed 70°F temperature is
reached by about 6:00 AM.
•AUTOMATIC CHANGEOVER — You can
set the thermostat to automatically switch
the system from heating to cooling as
needed.First,youmustmoveoptionswitch
#4 (located on the back of the thermostat
body)totheONposition,ifithasnotalready
been done. To do this, turn off 24 VAC
power to the thermostat. Then, remove the
thermostat body from the wall. Check the
position of switch #4 (the last switch on the
right).Ifitis ON(up),simplyput thethermo-
stat back on the wall and restore 24 VAC

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power. If the switch is OFF (down), use a
pencil or small screwdriver to move the
switch to the ON position (see figure at
right). Leave the battery out of the thermo-
stat for at least two minutes, to allow the
thermostat to reset itself. DO NOT MOVE
ANY OTHER OPTION SWITCH, as it may
affect thermostat operation. Replace the
battery,putthethermostatbackonthewall,
and restore 24 VAC power. To set the
thermostat for automatic changeover after
programming, press
SYSTEM
HEAT - OFF - COOL - AUTO
to set the ther-
mostat to AUTO (the setpoint display is
blank in the AUTO mode). The system will
now automatically switch between heating
and cooling depending on the actual room
temperature.
Switch #1 set at installation (DO NOT CHANGE)
Switch #2 set at installation (DO NOT CHANGE)
Switch #3 set at installation (DO NOT CHANGE)
Switch #4 ON
In the AUTO mode, the thermostat will not
allow the temperature separation between
the highest heat setting and the lowest cool
setting to be less than 1°F. For example, if
the highest heat setting is 76°F, the lowest
cool setting cannot be below 77°F (see
diagram below).
79
78
77
76
75
74
73
COOLING TEMPERATURES
HEATING TEMPERATURES
DEAD BAND 1°F
ON
1234

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•TWO HOUR TEMPERATURE OVER-
RIDE — Press or until the
display shows the temperature you want.
The thermostat will override current pro-
gramming and keep the room temperature
at the selected temperature for two hours.
After two hours, the thermostat will auto-
matically revert to the program.
•HOLD TEMPERATURE — Thethermostat
can hold any temperature within its range
for an indefinite period, without reverting to
the program. Press
HOLD
TEMP
. HOLD will be
displayed. Then choose the desired hold
temperature by pressing or .
The thermostat will hold the room tempera-
ture at the selected setting until you press
RUN
PRGM
to startprogram operationagain. This
featureisidealforenergyconservationwhen
the building is unoccupied for an extended
period of time.
•"ADVANCE PROGRAM" BUTTON —
Press
ADV
PRGM
to advance the thermostat pro-
gram to the next period (such as from the
MOR program period to the DAY program
period). This change remains in effect until
the next program period begins.
•°F/°C CONVERTIBILITY — Press
TIME
FWD
and
TIME
BACK
at the same time until the tem-
perature display is in °C(Celsius). To dis-
play °F, repeat the process.
•ADJUSTABLE HEATING AND COOLING
CYCLE TIMES (ANTICIPATION) — If the
heating/coolingsystemisturningonandoff
too often (short cycles) or not often enough
(long cycles), you may want to adjust the
anticipation setting.

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A cooling anticipation setting of less
than 10 may cause decreased compres-
sor life.
Toadjust anticipation,press
SET
CLOCK
and
SET
DAY
at the same time. The display will show
HEAT 8 (this is the factory preprogrammed
heating anticipation setting). You may se-
lect any anticipation setting from 4 to 40.
Whenever adjusting anticipation, increase
or decrease the displayed number by only
oneor twodigits,thenletthe systemrun for
a while to see if the adjustment is sufficient.
If the heat cycles are too short, press
TIME
FWD
toincreasethe cycletime.If theheatcycles
are too long, press
TIME
BACK
to decrease the
cycletime.Tosetcoolinganticipation,press
SET
CLOCK
and
SET
DAY
at the same time again. The
display will show COOL 14 (factory
preprogrammed cooling anticipation). Use
the
TIME
FWD
and
TIME
BACK
buttons to adjust antici-
pation. Press
RUN
PRGM
to return to your pro-
gram.
•LOW BATTERY INDICATOR — The word
BAT will flash on the display if the 9 volt
alkaline battery is low and should be re-
placed.
•AUDIO PROMPTING — Each time you
pressabutton,thethermostatwillbeep(this
feature works only when the thermostat is
attached to the wall and 24 VAC power is
present to the thermostat).
CAUTION
!

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•BACKLIT DISPLAY — When you press
any button on the thermostat, the display is
litforapproximatelyeightseconds(thisfea-
ture works only when the thermostat is
attached to the wall and 24 VAC power is
present to the thermostat).
•COMPRESSORSHORTCYCLEPROTEC-
TION — To protect your compressor from
potential damage due to rapid cycling, this
thermostat has a built-in delay of 5 minutes
between cooling cycles. The blower will
operate during a time delay, but the air
circulated will not be cooled. The following
may cause a time delay in COOL:
a) Return of power after a power outage.
b) Pressing
SYSTEM
HEAT - OFF - COOL - AUTO
to change operating
modes.
c) Pressing or to create a call
for COOL too soon after a previous call.
•SYSTEM INDICATOR LIGHTS — The red
indicator light comes on whenever the first
stage heating or cooling system is operat-
ing. The yellow indicator light comes on
when the second or third stages of heating
or cooling are operating.
•PROGRAMMABLE BLOWER CONTROL
— You may program the fan blower to run
continuously during any given program pe-
riod,regardlessofthecyclingoftheheating
or cooling system. During programming,
after entering the time and temperature for
the time period, press
FAN
ON - AUTO
until FAN
appears. To override constant fan, press
FAN
ON - AUTO
until FAN appears.

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PLANNING FOR YOUR NEEDS
This thermostat will store separate heating and
cooling programs for five-day (weekday) and
two-day (weekend) operation. Usually, the five-
day program is set to run Monday through Fri-
day, and the two-day program is set to run
SaturdayandSunday.However,youmaychoose
any five consecutive days to be your weekday
program days (such as Sunday through Thurs-
day; in this case, your weekend program would
run on Friday and Saturday).
First,youshouldanswerthefollowingquestions
to help you decide what your needs are. If you
areusingthethermostatforacommercialappli-
cation (a store, office building, etc.), answer
PROGRAMMINGYOURTHERMOSTAT
Nowyou are readyto programyour thermostat.
Thissectionwillhelpyouplanandprogramyour
thermostat to meet your needs.
For maximum comfort and efficiency, keep the
followingguidelinesinmindwhenplanningyour
program.
• When heating (cooling) your building, pro-
gramthetemperaturestobecooler(warmer)
when the building is vacant or during peri-
ods of low activity.
• During early morning hours, the need for
cooling is usually minimal.

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questions 1 through 4. If you are using the
thermostat in your home, answer questions 5
through8.Keepinmindthatyoushouldplanfor
both weekday and weekend programs.
FOR COMMERCIAL APPLICATIONS:
1a. Whattimedoesthefirstpersonarriveatthe
building in the morning?
b. Whattemperatureshould the buildingbe at
thistime? (heating?cooling?)These willbe
your MOR (morning) temperature settings.
2a. What time do the building occupants reach
amaximumactivitylevel(usinglights,equip-
ment, meeting rooms, etc.)?
b. Whattemperatureshould the buildingbe at
thistime?Thesewill beyourDAY tempera-
ture settings.
3a. What time do the building occupants reach
a minimum activity level (limited personnel
in building)? These will be your EVE
(evening) temperature settings.
b. Whattemperatureshould the buildingbe at
this time?
4a. What time does the building become va-
cant?
b. Whattemperatureshould the buildingbe at
this time? These will be your NHT (night)
temperature settings.
IN YOUR HOME:
5a. Whattimedoesthefirstpersongetupinthe
morning?
b. What temperature should the house be at
this time? These will be your MOR (morn-
ing) temperature settings.

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6a. What time does the last person leave the
house in the morning?
b. What temperature should the house be at
thistime?Thesewill beyourDAY tempera-
ture settings.
7a. Whattimedoesthefirstpersonarrivehome
in the evening?
b. What temperature should the house be at
thistime?ThesewillbeyourEVE (evening)
temperature settings.
8a. Whattime does thelast person goto bed at
night?
b. What temperature should the house be at
this time? These will be your NHT (night)
temperature settings.
Now look at the factory preprogrammed times
and temperatures shown at the top of the next
page.Ifthisprogramwillsuityourneeds,simply
press
RUN
PRGM
to begin running the factory preset
program.
Ifyouwanttochangethepreprogrammedtimes
and temperatures, do the following.
To operate properly in the AUTO mode, there
must be a minimum 1°F separation between
the highest heat temperature and the lowest
cool temperature (see diagram below).
NOTE
79
78
77
76
75
74
73
COOLING TEMPERATURES
HEATING TEMPERATURES
DEAD BAND 1°F

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Heating Program for ALL days of the Week: Cooling Program for ALL Days of the Week:
PERIOD TIME TEMP PERIOD TIME TEMP
MOR
DAY
EVE
NHT
5:00 AM
9:00 AM
4:00 PM
10:00 PM
70
70
70
64
MOR
DAY
EVE
NHT
5:00 AM
9:00 AM
4:00 PM
10:00 PM
78
82
78
78
FACTORY PREPROGRAMMING
Determine the time periods and heating and
cooling temperatures for your weekday pro-
gram.Youmustprogram4periodsforeachday
(MOR, DAY, EVE, and NHT). However, you
mayusethesameheatingandcoolingtempera-
tures for consecutive time periods. You can
choose start times, heating temperatures, and
cooling temperatures independently for both
weekday and weekend programs (for example,
youmayselect5:00AMand70°astheweekday
MOR heating start time and temperature, and
choose 7:00 AM and 76°as the weekday MOR
cooling start time and temperature). Use the
following table to plan your program time peri-
ods,andthetemperaturesyouwantduringeach
period.Youmayalsowanttolookatthesample
programtableto get anidea of howthethermo-
stat can be programmed.