White Rodgers 1F91-71 User manual

OPERATION GUIDE
Multi-stage Electronic Digital
Thermostat
1F91-71
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!

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• 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
• Audio and visual prompting during pro-
gramming
• Programmable blower control
• Two hour temperature override
• Manualprogramoverride(HOLDtempera-
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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Beforeyoubeginprogrammingyournewther-
mostat, you should be familiar with its fea-
turesandwiththedisplayandthelocationand
operation of the thermostat buttons. The in-
formation in this section will help you become
familiar with your thermostat so that you can
easily program it.
Yourthermostatconsistsoftwoparts:thether-
mostat body and the subbase.
Use
SYSTEM
SWITCH
to turn thermostat OFF be-
fore removing or attaching the thermo-
stat body. Equipment damage and/or
personal injury could occur.
OPERATINGYOURTHERMOSTAT
Thesubbaseisattachedtothewall,butyoucan
remove the thermostat body for easy program-
ming. To remove the thermostat body from the
subbase,graspthethermostatbodyandgently
pull it out from the bottom of the subbase, then
pivot up. To attach the thermostat body, line up
thefourterminalpinsontheuppersectionofthe
thermostat back with the matching connector
on the subbase. Insert these, then gently pivot
the thermostat body down to connect the nine
pin connectors on the lower portion of the ther-
mostat back. Gently push until the snap con-
nectors engage. DO NOT FORCE OR PRY
THE THERMOSTAT, as this may damage
the unit.
CAUTION
!

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If the word BAT is flashing in the display
window, the battery is low and should be
replaced with a fresh 9 volt Energizer®
alkaline battery. The battery will provide
power for all functions except the display
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
thermostatwillautomaticallymaintainafac-
tory preprogrammed heating temperature
of 64°F and a cooling temperature of 82°F
after power is restored. You must repro-
gram the thermostat if this happens.
BACK OF THERMOSTAT BODY
Option switches 9-pin connector
4-pin connector Battery

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light and audio prompting, which work only
on 24 VAC power. If the word BAT is dis-
playedcontinuously(non-flashing),thether-
mostat is not being supplied with 24 VAC
power and is being powered by the battery
alone.
Use
SYSTEM
SWITCH
to turn thermostat OFF be-
fore removing thermostat from the wall
to replace the battery.
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
located behind the thermostat door. To open
the door, use your fingernail in the indentation
at the 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
1Continuouslydisplayssystemmode(HEAT,
OFF,COOL,AUTO,HOLD). During pro-
gramming,theprogramperiodisdisplayed
(MOR, DAY, EVE, NHT).
2Alternately displays room temperature (F
denotes degrees Fahrenheit and Cde-
notes degrees Celsius) and time of day (A
denotes AM time and Pdenotes PM time).
3
Displays the setpoint temperature.
4
5DAYindicatesthatthedisplayedprogram
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.
5
ThewordBAT flasheson the displaywhen
the 9 volt alkaline battery is weak and
should be replaced.
6
FAN is displayed when the blower is
operatingcontinuously,regardlessofheat-
ing or cooling system cycling. FAN is
displayed during automatic fan operation
(whentheblowercycleswiththeheatingor
cooling system).

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SYSTEM
SWITCH
FAN
SWITCH
HEAT/OFF/COOL/AUTO
TIME
FWD
TIME
BACK
SET
CLOCK
SET
DAY
VIEW
PRGM
RUN
PRGM
HOLD
TEMP
ADV
PRGM
DIGITAL MULTI-STAGE COMFORT-SET II
W H I T E - R O D G E R S
1 2 3
466
2 DAY 5 DAY
2
3
54
FAN FANBAT
ON /AUTO
5 DAY FAN

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The Thermostat Buttons
7Sets the system mode (HEATing, OFF,
COOLing,orAUTOmaticchangeover[user
selectable feature]).
8Selectsfanoperation(see#6,above).This
buttonisalsousedtoprogramthefantorun
continuously during a program period.
9
Runs display forward or backward through
time, day, or anticipation settings during
programming.
10 Used with
TIME
FWD
and
TIME
BACK
to set current time
and day of the week.
11 Used during programming to set the day of
the week. Also used with SET
CLOCK to enter
anticipation setting mode.
12
Used to initiate or review thermostat pro-
gramming.
13
Used to start program operation after pro-
gramming. Also used to return thermostat
to program operation after being in HOLD
mode.
14
Usedtomanuallyoverrideprogramming to
holdataselectedtemperature(whenHOLD
is displayed).
15
Usedtoadvancethermostatprogramtothe
nextprogramperiod (forexample,from the
MOR program to the DAY program).
16
(Blue arrow) Lowers temperature setting
(40°F or 4°C minimum).
17
(Red arrow) Raises temperature setting
(99°F or 37°C maximum)

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18 The red light is on when the 1st stage
heating/cooling system is operating. The
yellowlightisonwhen the 2nd or 3rdstage
heating/cooling system is operating.
SYSTEM
SWITCH
FAN
SWITCH
TIME
FWD
TIME
BACK
SET
CLOCK
SET
DAY
VIEW
PRGM
RUN
PRGM
HOLD
TEMP
ADV
PRGM
II
W H I T E - R O D G E R S
10 11 12 13 14 15
16 17 18
9
7
8
HEAT/OFF/COOL/AUTO
DIGITAL MULTI-STAGE COMFORT-SET
ON /AUTO
5 DAY FAN

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OPERATING FEATURES
Now that you are familiar with the thermostat
displayandbuttons,readthefollowinginforma-
tion to learn about the many features of the
thermostat.
•COMPUTED ENERGY MANAGEMENT
RECOVERY (EMR) - The thermostat’s mi-
crocomputer automatically calculates the
time it will take to change the temperature
to the next program setting. Then the ther-
mostat will activate the heating or cooling
system to change the temperature so that
the desired temperature is reached at the
beginningofthenextprogramperiod.Asan
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).IfitisON(up),simplyputthethermo-
stat back on the wall and restore 24 VAC
power. If the switch is OFF (down), use a

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Automatic Changeover (ON)
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
IntheAUTOmode,thethermostatwillnotallow
the temperature separation between the high-
estheatsettingandthelowestcoolsettingtobe
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).
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,
andrestore24 VACpower.Tosetthether-
mostatforautomaticchangeover after pro-
gramming, press
SYSTEM
SWITCH
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.
79
78
77
76
75
74
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.
•HOLDTEMPERATURE—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 .
Thethermostatwillholdtheroomtempera-
ture at the selected setting until you press
RUN
PRGM to start program operation again. This
feature is ideal for energy conservation
when 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/°CCONVERTIBILITY—Press
TIME
FWD
and
TIME
BACK at the same time until the temperature
display is in °C(Celsius). To display °F,
repeat the process.
•ADJUSTABLEHEATINGANDCOOLING
CYCLE TIMES (ANTICIPATION) — If the
heating/coolingsystemisturningonandoff

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toooften(short cycles) ornotoften enough
(long cycles), you may want to adjust the
anticipation setting.
A cooling anticipation setting of less
than 10 may cause decreased com-
pressor life.
To adjust anticipation, press
SET
CLOCK
and SET
DAY
at the same time. The display will show
HEAT8 (thisisthefactorypreprogrammed
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
oneortwodigits,thenletthesystemrunfor
awhiletoseeiftheadjustmentissufficient.
If the heat cycles are too short, press
TIME
FWD
toincreasethecycletime.Iftheheatcycles
are too long, press TIME
BACK to decrease the
cycletime.Tosetcoolinganticipation,press
SET
CLOCK and SET
DAY at the same time again. The
displaywillshowCOOL 14(factoryprepro-
grammedcoolinganticipation).Usethe
TIME
FWD
and TIME
BACK buttonstoadjustanticipation.Press
RUN
PRGM to return to your program.
•LOW BATTERY INDICATOR — The word
BAT will flash on the display if the 9 volt
alkaline battery is low and should be re-
placed.
CAUTION
!

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•AUDIO PROMPTING — Each time you
press a button, the thermostat will beep.
•BACKLIT DISPLAY — When you press
anybuttonon the thermostat,thedisplay is
lit for approximately eight seconds (this
feature works only when the thermostat is
attached to the wall and 24 VAC power is
present to the thermostat).
•COMPRESSOR SHORT CYCLE PRO-
TECTION — To protect your compressor
frompotentialdamageduetorapidcycling,
this thermostat has a built-in delay of 5
minutesbetweencoolingcycles.Theblower
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
SWITCH
to change operating
modes.
c) Pressing or to create a call
forCOOL 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 CON-
TROL — You may program the fan blower
to run continuously during any given pro-
gramperiod,regardlessofthecyclingofthe
heatingorcoolingsystem.Duringprogram-
ming, after entering the time and tempera-
tureforthetimeperiod,press
FAN
SWITCH
until

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FAN is displayed. To override constant
fan, press
FAN
SWITCH
until FAN is dis-
played.
PROGRAMMINGYOURTHERMOSTAT
Nowyouarereadytoprogramyourthermostat.
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.
PLANNING FOR YOUR NEEDS
Thisthermostatwillstoreseparateheating and
cooling programs for five-day (weekday) and
two-day(weekend)operation.Usually,thefive-
day program is set to run Monday through
Friday, and the two-day program is set to run
Saturday and Sunday. However, you may
choose any five consecutive days to be your
weekdayprogramdays(suchasSundaythrough
Thursday; in this case, your weekend program
would run on Friday and Saturday).

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First, you should answer the following ques-
tionstohelpyoudecide what your needs are.If
you are using the thermostat for a commercial
application (a store, office building, etc.), an-
swerquestions1through4.Ifyouareusingthe
thermostat in your home, answer questions 5
through8.Keepinmindthatyoushouldplanfor
both weekday and weekend programs.
FOR COMMERCIAL APPLICATIONS:
1a. Whattimedoesthefirstpersonarriveatthe
building in the morning?
b. Whattemperatureshouldthebuildingbeat
thistime?(heating?cooling?)Thesewillbe
your MOR (morning) temperature settings.
2a. What time do the building occupants reach
amaximumactivitylevel(usinglights,equip-
ment, meeting rooms, etc.)?
b. Whattemperatureshouldthebuildingbeat
thistime?ThesewillbeyourDAYtempera-
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. Whattemperatureshouldthebuildingbeat
this time?
4a. What time does the building become va-
cant?
b. Whattemperatureshouldthebuildingbeat
this time? These will be your NHT (night)
temperature settings.
IN YOUR HOME:
5a. Whattimedoesthefirstpersongetupinthe
morning?

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b. What temperature should the house be at
this time? These will be your MOR (morn-
ing) temperature settings.
6a. What time does the last person leave the
house in the morning?
b. What temperature should the house be at
thistime?ThesewillbeyourDAYtempera-
ture settings.
7a. Whattimedoesthefirstpersonarrivehome
in the evening?
b. What temperature should the house be at
thistime?ThesewillbeyourEVE(evening)
temperature settings.
8a. Whattimedoesthelastpersongotobedat
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
COOLING TEMPERATURES
HEATING TEMPERATURES
DEAD BAND 1°F

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Determine the time periods and heating and
cooling temperatures for your weekday pro-
gram.Youmustprogram4periodsforeachday
(MOR, DAY, EVE, and NHT). However, you
may use the same heating and cooling tem-
peratures for consecutive time periods. You
can choose start times, heating temperatures,
and cooling temperatures independently for
both weekday and weekend programs (for ex-
ample, you may select 5:00 AM and 70°as the
weekday MOR heating start time and tempera-
ture, and choose 7:00 AM and 76°as the
weekday MOR cooling start time and tempera-
ture). Use the following table to plan your pro-
gram time periods, and the temperatures you
want during each period. You may also want to
look at the sample program table to get an idea
of how the thermostat can be programmed.
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