White Rodgers 1f81 51 Thermostat User Manual

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1F81-51

Programmable Electronic

Digital Multi-stage Thermostat

INSTALLATION AND

WHITE-RODGERS

OPERATION INSTRUCTIONS

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY

BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE

PERSONAL INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

Your new White-Rodgers 5-Day/2-Day Digital Multi-stage Ther-

mostat uses the technology of a solid-state microcomputer to

provideprecisetime/temperaturecontrol.Thisthermostatoffers

you the flexibility to design heating and cooling programs that fit

your needs.

• Preprogrammed temperature control

• LCD continuously displays set point, and alternately dis-

plays time and room temperature

• Temperature override until next program period

• Manual program override (HOLD temperature)

• °F/°C convertibility

Features:

• Temperature range 45° to 90°F

• Separate 5-day (weekday) and 2-day (weekend) programming

with four separate time/temperature periods per program

• Two-stage heat/two-stage cool

• Simultaneous heat and cool program storage

• Armchair Programming Capability

• Optional C terminal (dual power option)

PRECAUTIONS

CAUTION

Thisthermostatisintendedforusewitha24-voltsystem;donot

use this thermostat with a millivolt or line voltage system. If in

doubt about whether your wiring is millivolt, line, or low voltage,

have it inspected by a qualified heating and air conditioning

contractor or electrician.

To prevent electrical shock and/or equipment damage

disconnect electric power to system at main fuse or

circuit breaker box until installation is complete.

Do not exceed the specification ratings.

WARNING

Allwiringmustconformtolocalandnationalelectricalcodesand

ordinances.

Do not use on circuits exceeding specified voltage.

Higher voltage will damage control and could cause

shock or fire hazard.

This control is a precision instrument, and should be handled

carefully. Roughhandlingordistortingcomponentscouldcause

the control to malfunction.

Do not short out terminals on gas valve or primary

control to test. Short or incorrect wiring will damage

thermostat and could cause personal injury and/or

property damage.

SPECIFICATIONS

ELECTRICAL DATA

APPLICATIONS

Electrical Rating:

For use with:

20 to 30 VAC 50/60 Hz. or D.C.

0.05 to 1.5 Amps (Load per terminal)

1.5 Amps Maximum Total Load (All terminals combined)

• Heat/cool systems with up to two stages heat, two

stages cool

DO NOT USE WITH:

THERMAL DATA

• Millivolt systems

Setpoint Temperature Range:

45°F to 90°F (7°C to 32°C)

• Systems exceeding 30 VAC and 2.5 amps

• 3-wire zoned hydronic heating systems

Operating Ambient Temperature Range:

32°F to 105°F

Operating Humidity Range:

0 to 90% RH (non-condensing)

Shipping Temperature Range:

-40°F to 150°F

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.

9797 REAVIS ROAD

PART NO. 37-5854E

Printed in U.S.A.

Replaces 37-5854D

0004

ST. LOUIS, MISSOURI 63123-5398

INSTALLATION

REMOVE OLD THERMOSTAT

1. Shut off electricity at the main fuse box until installation is

complete. Ensure that electrical power is disconnected.

2. Remove the front cover of the old thermostat. With wires

still attached, remove wall plate from the wall. If the old

thermostathasawallmountingplate,removethethermostat

and the wall mounting plate as an assembly.

W901

CUT FOR

LONGER CYCLES

3. Identifyeachwireattachedtotheoldthermostatusingthe

labels enclosed with the new thermostat.

W903

CUT TO

DEFEAT EMR

4. Disconnect the wires from old thermostat one at a time. DO

GAS ELECTRIC

NOT LET WIRES FALL BACK INTO THE WALL.

5. Install new thermostat using the following procedures.

PRE-INSTALLATION SET-UP

Figure 1. Back of thermostat base

1. Remove the packing material from the thermostat.

Alkaline batteries (3 “AA”–

install “+” ends to the left)

2. This thermostat is configured from the factory to operate a

heat/cool, fossil fuel (gas, oil, etc.), forced air system with up

to 2 stages of heat and 2 stages of cool. It is configured

correctly for any system that DOES NOT require the thermo-

stat to energize the fan on a call for heat.

Screw anchors

If your system is an electric heat or heat-pump system that

REQUIRES the thermostat to turn on the fan on a call for

heat, locate the GAS/ELECTRIC switch on the back of the

thermostat (see fig. 1) and switch it to the ELECTRIC

position. This will allow the thermostat to energize the fan

immediatelyonacallforheat.Ifyouareunsureiftheheating/

cooling system requires the thermostat to control the fan,

contact a qualified heating and air conditioning service

person.

Reset

button

3. Two jumpers are also located on the back of the thermostat,

so that you may customize the thermostat to meet your

individual preference (see fig. 1). In most applications, the

factory jumper settings provide the most comfortable and

convenient thermostat operation.

Mounting

holes

Figure 2. Thermostat base

Jumper wire W901 determines how fast the system cycles

on and off, based on temperature change. As shipped from

the factory, the thermostat will maintain a very consistent

room temperature, usually within 1°F of the thermostat

setting. To achieve a slower on and off cycle, providing a

slightly wider temperature span, cut and separate jumper

wire W901.

INSTALLING THE THERMOSTAT

1. Gently remove the cover by pulling it straight off the base.

Forcing or prying on the unit may cause damage to the unit.

2. Remove the battery tab. With the batteries installed, the

Armchair Programming feature allows you to program the

thermostat before installing it on the wall.

JumperwireW903controlstheEnergyManagementRecov-

ery (EMR) feature. EMR allows the thermostat to energize

the heating system up to 30 minutes before the time pro-

grammed into the thermostat. The thermostat will then

energize the system to gradually raise the temperature to

your programmed temperature by using the most efficient

stage of heat practical.

3. Pull wires through the hole in the thermostat base and place

the base over the hole in the wall. Mark mounting hole

locations on the wall using the base as a template.

4. Move the base out of the way. Drill mounting holes.

5. Fasten the base loosely to the wall, as shown in fig. 2, using

two mounting screws. Place a level against the bottom of the

base, adjust until level, and then tighten the screws. (Level-

ing is for appearance only and will not affect thermostat

operation.) If you are using existing mounting holes, or if the

holes drilled are too large and do not allow you to tighten the

base snugly, use plastic screw anchors to secure the base.

For example, assume that the thermostat is programmed

overnightto66°Fandtheroomtemperatureis66°. Ifthenext

programis7AM, 70°F(anincreaseof4°), thethermostatwill

start the system 30 minutes before 7 AM. If the temperature

is in the room is within 2°F of your next programmed

temperature, the thermostat will not start the system early.

DO NOT clip jumper wire W903 unless you wish to perma-

nently disable the EMR feature.

6. Check that the SYSTEM switch is in the OFF position.

Connect the wires beneath the terminal screws on the base

using the appropriate wiring diagram (see figs. 3 through 5).

If LOW BATTERY is displayed, the batteries are low and

should be replaced with fresh “AA” Energizer^®alkaline

batteries. To replace batteries, install the batteries along the

top of the base (see fig. 2). The batteries must be installed

with the positive (+) ends to the left.

7. Push excess wire into wall and plug hole with a fire-resistant

material(suchasfiberglassinsulation)topreventdraftsfrom

affecting thermostat operation.

(Instructions continue on page 4.)

NOTE

The following wiring diagrams show typical terminal identifica- Relay contacts shown are thermostatically operated.

tion and wiring. For proper installation, refer to the original

manufacturer's instructions.

* The 24 Volt neutral connection

to terminal C on the thermostat

is not required if you replace

Thermostat

the batteries once a year with

Control

fresh “AA” Energizer^®alkaline

Circuit

batteries.

THERMOSTAT

SYSTEM

Heat

Relay

Compressor

Contactor

Stage 2

Stage 1

Hot

24 VAC

120 VAC

Neutral

Compressor

Contactor

Stage 1

Heat

Relay

Fan

Relay

TRANSFORMER

Stage 2

Figure 3. Typical wiring diagram for single transformer systems

* The 24 Volt neutral connection

to terminal C on the thermostat

is not required if you replace

the batteries once a year with

fresh “AA” Energizer^®alkaline

batteries.

Thermostat

Control

Circuit

THERMOSTAT

SYSTEM

CUT AND

TAPE OFF!

Hot

Heat

Relay

Compressor

Contactor

Stage 2

120 VAC

24 VAC

Stage 1

Hot

Neutral

24 VAC

120 VAC

TRANSFORMER

Compressor

Contactor

Stage 1

Heat

Relay

Neutral

TRANSFORMER

Fan

Relay

Stage 2

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits

* The 24 Volt neutral connection

Thermostat

to terminal C on the thermostat

Control

is not required if you replace

Circuit

the batteries once a year with

fresh “AA” Energizer^®alkaline

THERMOSTAT

SYSTEM

batteries.

Heat

Relay

Compressor

Contactor

Stage 2

Limit or

Safety

Switches

Stage 1

Limit or

Safety

Switches

Hot

24 VAC

120 VAC

Neutral

Compressor

Contactor

Stage 1

Heat

Relay

Fan

24 VAC

Accessory

Relay N.O.

Contact

HEATING

TRANSFORMER

Relay

Stage 2

Common

Limit or

Safety

Switches

Limit or

Safety

Switches

Hot

TWO COMMONS MUST

BE JUMPERED TOGETHER!

24 VAC

120 VAC

Common

Neutral

COOLING

TRANSFORMER

Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems

Ifthefanisrunningbutthecompressorisnotrunningandthe

word COOL is flashing, the compressor lockout feature is

operating (see Lockout Bypass Option to temporarily

override the compressor lockout feature during testing).

CHECK THERMOSTAT OPERATION

NOTE

If at any time during testing, your system does not operate

properly, contact a qualified serviceperson.

3. Press

toadjusttemperaturesettingaboveroomtempera-

ture. The cooling system should stop operating.

Fan Operation

NOTE

1. Turn on power to the system.

During normal operation, the second stage of heat or cool may

take 15 to 30 minutes to turn on. The delay varies depending on

theperformanceofthefirststage.Typicallythesecondstagewill

comeonsoonerinmoresevereweather,whileinmilderweather

it will take longer. There is no adjustment to this feature, as it is

designed to maximize both comfort and efficiency.

2. Move SYSTEM switch to OFF position.

3. MoveFANswitchtoON.Theblowershouldbegintooperate.

4. Move FAN switch to AUTO position. The blower should stop

within a short period of time.

Heating System

1. Move SYSTEM switch to HEAT position

LOCKOUT BYPASS OPTION

2. Press

toadjustthermostatsettingto90° andholdforfive

seconds. Both stages of the heating system should begin to

operate within five seconds.

FOR QUALIFIED SERVICE TECHNICIANS’ USE

ONLY.OPERATORSSHOULDNOTUSETHISFEA-

TURE DUE TO POSSIBILITY OF EQUIPMENT OR

PROPERTY DAMAGE, OR PERSONAL INJURY.

3. Press

toadjusttemperaturesettingbelowroomtempera-

ture. The auxiliary heating system will stop immediately and

the first stage will stop within three to four minutes.

COMPRESSOR SHORT TERM

CYCLE PROTECTION

Cooling System

CAUTION

During normal operation, this thermostat has a built-

in short term (5-minute) time delay. During this 5-

minute period, the thermostat will lock out the com-

pressortoallowheadpressuretostabilize. Ifyouwant

tooverridethisfeaturewhiletestingthermostatopera-

Topreventcompressorand/orpropertydamage, ifthe

outdoor temperature is below 50°F, DO NOT operate

the cooling system.

1. Move SYSTEM switch to COOL position.

tion, simply press and buttons at the same time.

2. Press

toadjustthermostatsettingto45° andholdforfive

seconds. The blower should come on immediately on high

speed, followed by cold air circulation. Both stages of the

cooling system should begin to operate (if you have a two-

stage cooling system).

DO NOT USE THE LOCKOUT BYPASS OPTION

UNLESSTHECOMPRESSOROILHEATERSHAVE

BEEN OPERATIONAL FOR 6 HOURS AND THE

SYSTEM HAS NOT BEEN OPERATIONAL FOR AT

LEAST 5 MINUTES.

OPERATION

Before you begin programming your thermostat, you should be

familiarwithitsfeaturesandwiththedisplayandthelocationand

operation of the thermostat buttons. Your thermostat consists of

two parts: the thermostat cover and the base. To remove the

cover, gently pull it straight out from the base. To replace the

cover, line up the cover with the base and press gently until the

cover snaps onto the base.

THE THERMOSTAT BASE

SET TIME VIEW PRGM RUN PRGM HOLD TEMP

FAN ON

AUTO

SYSTEM

Other than

and

, the following buttons and switches are

COOL-OFF-HEAT

located behind the door on the bottom of the thermostat cover

(see fig. 6). Pull the door down to open it.

The Thermostat Buttons and Switches

(Red arrow) Raises temperature setting.

(Blue arrow) Lowers temperature setting.

SET TIME button.

MO TU WE TH FR

SA SU

HEAT 1+2

HOLD ^{COOL 1+2}

VIEW PRGM (program) button.

RUN PRGM (program) button.

HOLD TEMPerature button.

11 13 10

Figure 6. Thermostat display, buttons, and switches

• HOLD TEMPERATURE — The thermostat can hold any

temperaturewithinitsrangeforanindefiniteperiod, without

reverting to the programmed temperature. Press HOLD

TEMP button. HOLD will be displayed. Then choose the

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

The Display

desired hold temperature by pressing

. The ther-

mostat will hold the room temperature at the selected

setting until you press RUN PRGM button to start program

operation again.

Indicates day of the week.

HEATisdisplayedwhentheSYSTEMswitchisintheHEAT

• °F/°C CONVERTIBILITY — Press SET TIME and HOLD

TEMP buttons until the temperature display is in Celsius

(°C). To display Fahrenheit (°F), repeat the process.

position. COOL is displayed when the SYSTEM switch is in

the COOL position. COOL is displayed (flashing) when the

compressor is in lockout mode.

• TEMPERATURE DISPLAY ADJUSTMENT — Your new

thermostathasbeenaccuratelysetinourfactory.However,

if you wish, you may adjust your new thermostat tempera-

ture display to match your old thermostat. This can be

accomplished (within a ±4°F range) as follows:

Alternately displays current time and room temperature.

Displays currently programmed set temperature (this is

blank when SYSTEM switch is in the OFF position).

1. Press VIEW PRGM and HOLD TEMP buttons at the

same time.

The word HOLD is displayed when the thermostat is in the

HOLD mode.

2. Press

to adjust the displayed temperature to

OPERATING FEATURES

Now that you are familiar with the thermostat buttons and

display, read the following information to learn about the many

features of the thermostat.

your desired setting.

3. Press RUN PRGM to resume normal program opera-

tion.

PROGRAMMING YOUR THERMOSTAT

• SIMULTANEOUS HEATING/COOLING PROGRAM

STORAGE—Whenprogramming,youcanenterbothyour

heating and cooling programs at the same time. There is no

need to reprogram the thermostat at the beginning of each

season.

Now you are ready to program your thermostat. This section will

help you plan your thermostat’s program to meet your needs.

For maximum comfort and efficiency, keep the following guide-

lines in mind when planning your program.

• When heating (cooling) your building, program the tem-

peratures to be cooler (warmer) when the building is vacant

or during periods of low activity.

• TEMPERATURE OVERRIDE — Press

until the

display shows the temperature you want. The thermostat

will override current programming and keep the room

temperature at the selected temperature until the next

program period begins. Then the thermostat will automati-

cally revert to the program.

• During early morning hours, the need for cooling is usually

minimal.

(Instructions continue on page 6.)

Look at the factory preprogrammed times and temperatures 3. Press SET TIME once. The display window will show the

shown below. If this program will suit your needs, simply press the

RUN PRGM button to begin running the factory preset program.

minutes only.

EXAMPLE:

FACTORY PREPROGRAMMING

Cooling Program for

Heating Program for

ALL days of the Week:

ALL Days of the Week:

TEMP

PERIOD

TIME

TEMP

PERIOD

1st

2nd

3rd

4th

TIME

4. Press and hold either

minutes.

until you reach the correct

70°F

62°F

70°F

62°F

1st

2nd

3rd

4th

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

78°F

85°F

78°F

82°F

5. Press SET TIME once. The display will show the day of the

week.

If you want to change the preprogrammed times and tempera-

tures, follow these steps.

6. Press

until you reach the current day of the week.

Determine the time periods and heating and cooling tempera-

tures for your weekday and weekend programs. You must

program four periods for both the weekday and weekend pro-

7. Press RUN PRGM once. The display will show the correct

time and room temperature alternately.

gram. However, you may use the same heating and cooling Enter Heating Program

temperatures for consecutive time periods. You can choose

1. If you want to change the display from Fahrenheit to Celsius

start times, heating temperatures, and cooling temperatures

independently for both weekday and weekend programs (for

example, you may select 5:00 AM and 70° as the weekday 1st

period heating start time and temperature, and also choose

7:00 AM and 76° as the weekday 1st period cooling start time

and temperature).

(or vice-versa), press SET TIME and HOLD TEMP at the

same time.

2. Move the SYSTEM switch to HEAT.

3. Press VIEW PRGM once. “MO TU WE TH FR” (indicating

weekday program) will be displayed. Also displayed are

the currently programmed start time for the 1st heating

period and the currently programmed temperature (flash-

ing).

Usethetableatthebottomofthepagetoplanyourprogramtime

periods,andthetemperaturesyouwantduringeachperiod.You

may also want to look at the sample program table to get an idea

of how the thermostat can be programmed.

MO TU WE TH FR

EXAMPLE:

Entering Your Program

This display window shows that for the 1st weekday period,

the start time is 6:00 AM, and 70° is the programmed

temperature(thisexamplereflectsfactorypreprogramming).

Follow these steps to enter the heating and cooling programs

you have selected.

Set Current Time and Day

4. Press

to change the displayed temperature to your

selected temperature for the 1st heating program period.

5. Press SET TIME once (the programmed time will flash).

1. Press SET TIME button once. The display will show the hour

only.

Press

untilyourselectedtimeisdisplayed. Thetime

EXAMPLE:

will change in 15 minute increments. When your selected

time is displayed, press SET TIME again to return to the

change temperature mode.

2. Press and hold either

until you reach the correct

6. Press VIEW PRGM once. The currently programmed start

time and setpoint temperature for the 2nd heating program

period will be displayed.

hour and AM/PM designation (AM begins at midnight; PM

begins at noon).

SAMPLE

Heating/Cooling Schedule Plan

WEEKEND (2 DAY)

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

WEEKDAY (5 DAY)

Start

Time

Start

Time

Start

Time

Start

Time

Period

Temperature

Period

Temperature

1ST HEAT

5:30 AM

70°F

7:00 AM

11:00 AM

6:00 PM

11:30 PM

7:00 AM

12:30 PM

6:00 PM

11:30 PM

70°F

2ND HEAT

3RD HEAT

4TH HEAT

1ST COOL

2ND COOL

3RD COOL

4TH COOL

2ND HEAT 8:00 AM

3RD HEAT 5:00 PM

4TH HEAT 10:30 PM

1ST COOL 6:30 AM

2ND COOL 2:00 PM

3RD COOL 5:00 PM

4TH COOL 10:30 PM

65°F

70°F

65°F

76°F

78°F

72°F

78°F

70°F

65°F

76°F

74°F

72°F

78°F

7. Repeat steps 4 and 5 to select the start time and heating

temperature for the 2nd heating program period.

CHECK YOUR PROGRAMMING

Follow these steps to check your thermostat programming one

final time before beginning thermostat operation.

8. Repeatsteps4through6forthe3rdand4thheatingprogram

periods. Weekday heating programs are now complete.

1. Move SYSTEM switch to HEAT position.

9. Press VIEW PRGM once. “SA SU” (indicating weekend

program) will be displayed, along with the start time for the

1st heating period and the currently programmed tempera-

ture.

2. Press VIEW PRGM to view the 1st weekday heating period

time and temperature. Each time you press VIEW PRGM,

the next heating period time and temperature will be dis-

played in sequence for weekday, then weekend program

periods(youmaychangeanytimeortemperatureduringthis

procedure).

10.Repeat steps 4 through 8 to complete weekend heating

programming.

11.When you have completed entering your heating program,

press RUN PRGM.

3. Press RUN PRGM.

4. Move SYSTEM switch to COOL position.

5. Repeat step 2 to check cooling temperatures.

6. Press RUN PRGM to begin program operation.

Enter Cooling Program

CAUTION

YOUR THERMOSTAT IS NOW COMPLETELY PRO-

GRAMMED AND READY TO AUTOMATICALLY PROVIDE

MAXIMUM COMFORT AND EFFICIENCY!

If the outside temperature is below 50°F, disconnect

power to the cooling system before programming.

Energizing the air conditioner compressor during

cold weather may cause personal injury or property

damage.

TROUBLESHOOTING

1. Move SYSTEM switch to COOL position.

If your thermostat’s display is frozen, blank or displaying incor-

rectly, the thermostat may have been affected by static dis-

charge or voltage variations. If this happens, press the RESET

button (see fig. 2, page 2 for the location of the button). Pressing

the RESET button will clear all user programming. The thermo-

stat will revert to factory preprogramming. You will need to reset

the time and, if desired, reprogram the thermostat to your

selected program. If pressing the RESET button does not

correct the problem, contact a qualified service technician.

2. Follow the procedure for entering your heating program,

using your selected cooling times and temperatures.

For optimum performance, we recommend replacing batteries

once a year with fresh “AA” Energizer^®alkaline batteries.

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