White Rodgers 1F90-51 User manual

OPERATION GUIDE
5 Day/2 Day Electronic
Digital Thermostat
1F90-51
WHITE-RODGERS
Operator: Save this booklet for future use!

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.

3
Operator: Save this
booklet for future use!
PROGRAMMING YOUR
THERMOSTAT .................................... 19
PLANNING FOR YOUR NEEDS
ENTERING YOUR PROGRAM
Set Current Time and Day
Enter Heating Program
Enter Cooling Program
CHECK YOUR PROGRAMMING
QUESTIONS AND ANSWERS................. 29
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 . . .

4
• Separate5-day(weekday)and2-day(week-
end) setback programming
• Simultaneousheatandcoolprogramstorage
• 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
• Preprogrammed temperature control
YOUR NEW THERMOSTAT’S FEATURES
• Adjustable cycle times
• Compressor short cycle protection
• Programmable blower control
• Blower delay in the cooling cycle
• Audio and visual prompting during operation
• Two hour temperature override
• Manual program override (HOLD tempera-
ture)
• “Advance Program” key
•°F/°C convertibility
• Temperature range 40°to 99°F

5
OPERATING YOUR THERMOSTAT
Before you begin programming your thermo-
stat,youshouldbefamiliarwithitsfeaturesand
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 ther-
mostat 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.
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
the thermostat body, line up the two terminal
pinsonthelowersectionofthethermostat back
with the matching connector on the subbase.
Insert these, then gently pivot the thermostat
bodyuptoconnectthesixpinconnectorsonthe
upper portion of the thermostat back. Gently
push until the snap connectors engage. DO
NOTFORCEORPRYTHETHERMOSTAT,as
this may damage the unit.
CAUTION
!

6
PARTS OF THE THERMOSTAT
The Back of The Thermostat Body
Turnthe thermostat body over.On the back are
the 3 “AA” Energizer®alkaline batteries.
The “AA” Energizer®alkaline batteries provide
powertothethermostatwhenthe24 VACpower
is interrupted (for example, when you remove
the thermostat from the wall for programming).
Freshbatterieswillmaintainthestoredprogram
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.
Use
SYSTEM
SWITCH
to turn the thermostat OFF
beforeremovingthethermostatfromthe
wall to replace batteries.
CAUTION
!

7
Other than and , the buttons are
locatedbehindthethermostatdoor.Toopenthe
door,putyourfingernailintheindentationatthe
topofthedoor,thenpullthedooroutfromthetop
and 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
2-pin connector
6-pin connector Batteries
W14 S3

8
5
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.
6
FAN ON is displayed when the blower is
operating continuously. FAN AUTO is dis-
playedduringautomaticfanoperation(when
theblowercycleswiththeheatingorcooling
system).
The Display
1
Continuouslydisplayssystemmode(HEAT,
OFF,COOL, HOLD).Duringprogramming,
theprogramperiodisdisplayed(MOR,DAY,
EVE, or NHT).
2
Alternately displays room temperature (F
denotesdegreesFahrenheitandCdenotes
degrees Celsius) and time of day (Ade-
notes AM time and Pdenotes PM time).
3
Displays the setpoint temperature.
4
5DAY indicatesthatthedisplayedprogram
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.

9
1 32
4
SYSTEM
SWITCH
FAN
SWITCH
HEAT-OFF-COOL-AUTO
TIME
FWD
TIME
BACK
SET
CLOCK
SET
DAY
VIEW
PRGM
RUN
PRGM
HOLD
TEMP
ADV
PRGM
2 DAY 5 DAYFAN AUTO FAN ON
ON-AUTO
5 DAY FAN AUTO
BATTERY
WHITE-RODGERS DIGITAL COMFORT SET II
4
3
6 6 2 5

10
12
Used to initiate or review thermostat pro-
gramming.
13
Used to start program operation after pro-
gramming.Alsousedtoreturnthermostatto
program operation after being in HOLD
mode.
14
Used to manually override programming to
holdataselectedtemperature(whenHOLD
is displayed).
15
Usedtoadvancethermostatprogramtothe
next program period (for example, from the
MOR program to the DAY program).
16
(Red arrow) Raises temperature set-
ting (99°F or 37°C maximum).
The Thermostat Buttons
7
Sets the system mode (HEATing, OFF, or
COOLing).
8
Selects fan operation (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.
11
Used with
TIME
FWD
and
TIME
BACK
to set the day of the
week. Also used in conjunction with
SET
CLOCK
to
enter anticipation setting mode.