White Rodgers 1F90W-51 User manual

OPERATION GUIDE
5 Day/2 Day Electronic
Digital Thermostat
1F90W-51
Operator: Save this booklet for future use!
WHITE-RODGERS
WHITE-RODGERS

2
About Your New Thermostat . . .
Your new White-Rodgers Digital Thermostat uses the technology of a solid-state microcomputer
to provide precise time/temperature control. This thermostat offers you the flexibility to design
heating and cooling programs that fit your needs.
Pleasereadthismanualthoroughlybeforeoperatingorprogrammingyourthermostat. Ifyouhave
questions, write to us at the address shown on the back cover of this manual.

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PROGRAMMING YOUR
THERMOSTAT .................................... 16
PLANNING FOR YOUR NEEDS
ENTERING YOUR PROGRAM
Set Current Time and Day
Enter Heating Program
Enter Cooling Program
CHECK YOUR PROGRAMMING
QUESTIONS AND ANSWERS................. 26
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
In This Guide . . .
Operator: Save this
booklet for future use!

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• Separate5-day(weekday)and2-day(week-
end) setback programming
• Simultaneous heat and cool program stor-
age
• Fourseparatetime/temperaturesettingsper
24-hour period
• Computed Energy Management Recovery
(EMR)
• Armchair programming capability
• Backlit LCD displays continuous set point,
time, and room temperature
• 1.5 volt "AA" Energizer®alkaline battery
backup
YOUR NEW THERMOSTAT’S FEATURES
• Preprogrammed temperature control
• Adjustable cycle times
• Compressor short cycle protection
• Programmable blower control
• Blower delay in the cooling cycle
• Audio and visual prompting during opera-
tion
• Two hour temperature override
• Manual program override (HOLD tempera-
ture)
• "Advance Program" key
•°F/°C convertibility
• Temperature range 40°to 99°F

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OPERATING YOUR THERMOSTAT
SUBBASE
THERMOSTAT
BODY
Before you begin programming your thermo-
stat,you shouldbe familiarwith itsfeatures and
with the display and the location and operation
of the thermostat buttons. The information in
this section will help you become familiar with
your new thermostat so that you can easily
program 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 removing
or attaching the thermostat body. Equip-
mentdamageand/orpersonalinjurycould
occur.
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 straight out from the subbase. To attach
thethermostatbody,lineupthesixterminalpins
ontheuppersectionofthethermostatbackwith
the matching connector on the subbase. Insert
CAUTION
!

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for approximately a year. If power loss is long
enough for the program to be lost, the thermo-
stat will automatically return to the factory pro-
grammedtemperatures(64°Fheatingand82°F
cooling) when power is restored. You must
reprogram the thermostat if this happens.
If the word BATTERY is flashing in the display
window, the batteries are low and should be
replaced with fresh "AA" Energizer® alkaline
batteries.
Before removing thermostat from the
wall to replace the batteries, remove
24vAC power from the thermostat at the
breaker/fuse box.
these, then gently pivot the thermostat body
downtoconnectthethreepinconnectorsonthe
lower portion of the thermostat back. Gently
push until the snap connectors engage. DO
NOTFORCEORPRYTHETHERMOSTAT,as
this may damage the unit.
PARTS OF THE THERMOSTAT
The Back of The Thermostat Body
Turnthethermostatbodyover. Onthebackare
the 3 "AA" Energizer®alkaline batteries.
The "AA" Energizer®alkaline batteries provide
powertothethermostatwhenthe24vACpower
is interrupted (for example, when you remove
the thermostat from the wall for programming).
Freshbatterieswillmaintainthestoredprogram
CAUTION
!

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Other than and , the buttons are
locatedbehindthethermostatdoor. Toopenthe
door, pull the door out from the top, then swing
it down on its hinges.
On the following pages there are brief descrip-
tions of the display and the thermostat buttons.
BACK OF THERMOSTAT BODY
3-pin Connector
6-pin Connector Batteries
W14 S3

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The word BATTERY flashes on the display
when the "AA" alkaline batteries are weak
and should be replaced. The word BAT-
TERYisdisplayedcontinuously(non-flash-
ing) when thermostat is running on battery
power only.
FAN ON is displayed when the blower is
operating continuously. FAN AUTO is dis-
playedduringautomaticfanoperation(when
theblowercycleswiththeheatingorcooling
system).
The Display
Continuouslydisplayssystemmode(HEAT,
OFF,COOL,HOLD). Duringprogramming,
theprogramperiodisdisplayed(MOR,DAY,
EVE, or 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.
5DAYindicatesthatthedisplayedprogram
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.
3
1
2
4
5
6

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1 2 3
466
2 DAY 5 DAY
2
3
4
FAN AUTO FAN ON
5 DAY FAN AUTO
5
BATTERY
TIME
FWD
SYSTEM
HEAT-OFF-COOL
SET
CLOCK VIEW PRGM HOLD TEMP
TIME
BACK
FAN
ON - AUTO
SET
DAY RUN PRGM ADV PRGM

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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).
(Red arrow) Raises temperature setting
(99°F or 37°C maximum).
(Blue arrow) Lowers temperature setting
(40°F or 4°C minimum).
Theredindicatorlightglowswheneverheat-
ing, cooling, or fan are in operation.
The Thermostat Buttons
Sets the system mode (HEATing, OFF, or
COOLing).
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 with
TIME
FWD
and
TIME
BACK
to set current
time.
Usedwith
TIME
FWD
and
TIME
BACK
tosetthecurrent
day of the week. Also used in conjunction
with
SET
CLOCK
toenteranticipationsettingmode.
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8
9
10
11
12
13
14
15
16
17
18

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10 11 12 13 14 15
1617 18
9
7
8
5 DAY FAN AUTO
TIME
FWD
SYSTEM
HEAT-OFF-COOL
SET
CLOCK VIEW PRGM HOLD TEMP
TIME
BACK
FAN
ON - AUTO
SET
DAY RUN PRGM ADV PRGM

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OPERATING FEATURES
Now that you are familiar with the thermostat
displayand buttons,readthe followinginforma-
tion to learn about the many features of the
thermostat.
•COMPUTED ENERGY MANAGEMENT
RECOVERY (EMR) — At installation, the
thermostat can be set to automatically cal-
culate the time it will take to change the
temperature to the next program setting.
Then the thermostat will activate the heat-
ing or cooling system to change the tem-
perature so that the desired temperature is
reached at the beginning of the next pro-
gramperiod. Asanexampleofthisfeature,
assume that you have programmed your
thermostat to provide an overnight heating
temperature of 62°F, and that during the
nextprogramperiod,beginningat6:00AM,
you have programmed a temperature of
70°F. The thermostat will automatically
activate the heating system at about 5:00
AM,sothattheprogrammed70°Ftempera-
ture is reached by about 6:00 AM.
The thermostat is configured at the factory
so that this feature is disabled. If you wish
to have this feature, refer to the installation
instructions for this thermostat, or contact
your local heating/cooling contractor.
•TWO HOUR TEMPERATURE OVER-
RIDE — Press or until the
display shows the temperature you
want. The thermostat will override cur-
rent programming and keep the room
temperature at the selected tempera-
ture for two hours. After two hours, the

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thermostat will automatically 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 start program operation again.
Thisfeatureisidealforenergyconservation
when the building is unoccupied for an ex-
tended period of time.
•"ADVANCE PROGRAM" BUTTON —
Press
ADV
PRGM
tochangethethermostattothe
next program period. This will temporarily
overridetheprogram,untilthenextprogram
period begins (for example, pressing this
key while in the DAY program will advance
the thermostat to the EVE program, which
will remain in effect until the NHT program
begins).
•°F/°C CONVERTIBILITY — Press
TIME
FWD
and
TIME
BACK
at the same time until the tem-
perature display is in °C(Celsius). To
display °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.
To adjust heat anticipation, press
SET
CLOCK
and
SET
DAY
atthesametime. Thedisplaywill
show HEAT 5 (this is the factory prepro-
grammedheatinganticipationsetting). You
mayselectanyanticipationsettingfrom2to
40 (note that for hydronic systems, a
minimum anticipation setting of 15 is
recommended). Whenever adjusting an-
ticipation, increase or decrease the dis-
played number by only one or two digits,
then let the system run for a while to see if
the adjustment is sufficient. If the heat
cycles are too short, press
TIME
FWD
to increase
thecycletime. Iftheheatcyclesaretoolong,
press
TIME
BACK
to decrease the cycle time. To
set cooling anticipation, press
SET
CLOCK
and
SET
DAY
atthesametimeagain. Thedisplaywill
showCOOL14(factorypreprogrammedcool-
ing anticipation). Use the
TIME
FWD
and
TIME
BACK
buttonstoadjustanticipation. Press
RUN
PRGM
to
return to your program.
•LOW BATTERY INDICATOR — The word
BATTERY will flash on the display if the
"AA" alkaline batteries are low and should
be replaced. The word BATTERY will be
displayedcontinuously(non-flashing)when
24v AC power is not being supplied to the
CAUTION
!

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thermostat and the thermostat is operating
on battery power only.
•AUDIO PROMPTING — Each time you
press a button, the thermostat will beep.
•BACKLIT DISPLAY — When you press
any button on the thermostat, the display is
lit for approximately eight seconds.
•SYSTEM INDICATOR LIGHT — The red
lightontheupperrightpartofthethermostat
indicatessystemoperation(seePARTSOF
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
betweencooling cycles. Thefollowingmay
cause a time delay in COOL:
a) Return of power after a power outage.
b) Pressing
SYSTEM
HEAT-OFF-COOL
to change operating
modes.
c) Pressing ,creatingacallforCOOL
too soon after a previous call.
PROGRAMMING

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Nowyou areready toprogram yourthermostat.
Thissectionwillhelpyouplanyourthermostat's
program 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
First,answerthefollowingquestionstohelpyou
decidewhatyourneedsare. Ifyouareusingthe
thermostatforacommercialapplication(astore,
officebuilding,etc.),answerquestions1through
4. Ifyou areusing thethermostatinyourhome,
answer questions 5 through 8.
FOR COMMERCIAL APPLICATIONS:
1a. Whattimedoesthefirstpersonarriveatthe
building in the morning?
b. Whattemperatureshould thebuilding beat
thistime?(heating?cooling?) Thesewillbe
your MOR (morning) temperature settings.
PROGRAMMING YOUR THERMOSTAT
PROGRAMMING

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2a. What time do the building occupants reach
amaximumactivitylevel(usinglights,equip-
ment, meeting rooms, etc.)?
b. Whattemperatureshould thebuilding beat
thistime? ThesewillbeyourDAYtempera-
ture settings.
3a. What time do the building occupants reach
a minimum activity level (limited personnel
in building)?
b. Whattemperatureshould thebuilding beat
thistime? ThesewillbeyourEVE(evening)
temperature settings.
4a. Whattimedoesthebuildingbecomevacant?
b. Whattemperatureshould thebuilding beat
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.
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.

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8a. Whattime doesthe lastperson goto bedat
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
andtemperaturesshownbelow. Ifthisprogram
willsuityourneeds,simplypress
RUN
PRGM
tobegin
running the factory preset program.
Ifyouwanttochangethepreprogrammedtimes
and temperatures, do the following.
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
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

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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 getan ideaof howthe thermo-
stat can be programmed.
ENTERING YOUR PROGRAM
Follow these steps to enter the heating and
cooling programs you have selected.
Werecommendthatyouremovethethermostat
from the wall for programming (especially for
entering cooling programming). Fresh "AA"
Energizer®alkaline batteries must be installed
to perform off-wall programming. BE SURE
SYSTEM SWITCH IS SET TO OFF POSITION
BEFORE REATTACHING THERMOSTAT TO
SUBBASE!
Set Current Time and Day
1. Press
SET
CLOCK
once. The display will show
minutes only.
EXAMPLE:
NOTE

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WEEKDAY (5 DAY) WEEKEND (2 DAY)
Start
Time Temperature Start Time Temperature
MOR HEAT
DAY HEAT
EVE HEAT
NHT HEAT
MOR COOL
DAY COOL
EVE COOL
NHT COOL
Heating/Cooling Schedule Plan