Emerson 1F83 277 Thermostat User Manual

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F83-277

Heating & Air Conditioning

Non-programmable, Auto Changeover, Multi-Stage/Heat

Pump Thermostat

INSTALLATION INSTRUCTIONS

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-

FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-

SONAL INJURY AND/OR PROPERTY DAMAGE.

PREPARATIONS

YOUR THERMOSTAT REPLACES

Description

Assemble tools required as shown below.

1F83-277

Yes

Heat Pump (No Aux. or Emergency Heat)

Heat Pump (with Aux. or Emergency Heat)

Standard Heat & Cooling Systems

Two Stage Heat & Two Stage Cool

Standard Heat Only Systems

Yes

FLAT BLADE SCREWDRIVER

Yes

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED

WIRE CUTTER/STRIPPER

Millivolt Heat Only Systems – Floor or Wall Furnaces

Standard Central Air Conditioning

Gas or Oil Heat

Yes

Electric Furnace

Yes

Hydronic (Hot Water) Zone Heat – 2 Wires

Hydronic (Hot Water) Zone Heat – 3 Wires

Yes

REMOVING OLD THERMOSTAT

CAUTION

To prevent electrical shock and/or equipment damage,

disconnect electric power to system at main fuse or

circuit breaker box until installation is complete.

Before removing wires from old thermostat's switching sub-

base, label each wire with the terminal designation it was

removed from.

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

complete. Ensure that electrical power is disconnected.

E/W1

L W2 G

Mounting

Hole

Mounting

Hole

. Remove Old Thermostat: A standard heat/cool

thermostat consists of three basic parts:

a. The cover, which may be either a snap-on or

hinge type.

ELEC.

GAS

Elec-Gas

Switch

AUTO

b. The base, which is removed by loosening all

captive screws.

Figure 1 – Thermostat base

c. The switching subbase, which is removed by

unscrewing the mounting screws that hold it on

the wall or adaptor plate.

ATTENTION! This product does not contain mercury. How-

ever, this product may replace a unit which contains mercury.

. Remove the front cover of the old thermostat. With

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

the old thermostat has a wall mounting plate, remove the

thermostat and the wall mounting plate as an assembly.

Do not open mercury cells. If a cell becomes damaged, do not

touch any spilled mercury. Wearing non-absorbent gloves,

clean up the spilled mercury and place into a container which

can be sealed. If a cell becomes damaged, the unit should be

discarded.

. Identify each wire attached to the old thermostat.

. Disconnect the wires from the old thermostat one at a

time. DO NOT LET WIRES FALL BACK INTO THE

WALL.

Mercury must not be discarded in household trash. When the

unit this product is replacing is to be discarded, place in a

suitable container and refer to www.white-rodgers.com for the

location to send product containing mercury.

6. Install new thermostat using the following procedures.

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com

PART NO. 37-6509E

Replaces 37-6509D

0818

MOUNTING AND WIRING

WARNING

Do not use on circuits exceeding specified voltage.

Higher voltage will damage control and could cause

shock or fire hazard.

CAUTION

Take care when securing and routing wires so they do

not short to adjacent terminals or rear of thermostat.

Personal injury and/or property damage may occur.

Attach Thermostat Base to Wall

. Remove the packing material from the thermostat. Gently

pull the cover straight off the base. Forcing or prying on

the thermostat will cause damage to the unit.

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.

. Connect wires beneath terminal screws on base using

appropriate wiring schematic (see figs. 2 through 4).

Thermostat installation and all components of the

system shall conform to Class II circuits per the NEC

code.

3. Place base over hole in wall and mark mounting hole

locations on wall using base as a template.

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

Electric/Gas Switch (Fan Option)

. Fasten base loosely to wall, as shown in fig. 1, using two

mounting screws. Place a level against bottom of base,

adjust until level, and then tighten screws. (Leveling is for

appearance only and will not affect thermostat operation.)

If you are using existing mounting holes, or if holes drilled

are too large and do not allow you to tighten base snugly,

use plastic screw anchors to secure subbase.

This thermostat is configured from the factory to operate a heat/

cool, fossil fuel (gas, oil, etc.), forced air system. It is configured

correctly for any system that DOES NOT require the thermostat

to energize the fan on a call for heat. If you 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 ELEC/GAS switch

on the back of the thermostat (see fig. 1) and switch it to the

ELEC position. This will allow the thermostat to energize the fan

immediately on a call for heat. If you are unsure if the heating/

cooling system requires the thermostat to control the fan,

contact a qualified heating and air conditioning service person.

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

resistant material (such as fiberglass insulation) to

prevent drafts from affecting thermostat operation.

Battery Location

“AA” alkaline batteries are included in the thermostat at the

When the thermostat is configured for Heat Pump, the thermo-

stat will always power the circulator fan on a call for heat in the

HEAT mode. The ELEC/GAS switch must be set to match the

type of Auxiliary heat your system uses for proper operation in

the EMERgency mode.

factory with a battery tag to prevent power drainage. You

must remove the battery tag to engage the batteries.

If “BATT” is displayed, the batteries are low and should be

replaced. For best results, replace all batteries with new

premium brand alkaline batteries such as Duracell or

Energizer . To replace batteries, press system button to

All wiring diagrams are for typical systems only. Refer to

equipment manufacturers’ instructions for specific system wir- OFF, install the batteries along the top of the base (see Fig.

ing information.

1). The batteries must be installed with the positive (+) end to

the left.

E/W1

THERMOSTAT

SYSTEM

MONITOR

SWITCH

Reversing Valve

Energized in Cool

Mode

Reversing Valve

Energized in Heat,

Off, Emergency

Mode

2nd Stage

Compressor

Fan

Relay

Emergency

Heat

Relay

Aux

Heat

Relay

Compressor

Contactor

Hot

4 VAC

120 VAC

Neutral

TRANSFORMER

(

Class II Current Limited)

Figure 2.Typical wiring diagram for single transformer heat pump 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” alkaline batteries.

NOTE

If safety circuits are in only one of the systems, remove

the transformer of the system with NO safety circuits.

E/W1

THERMOSTAT

SYSTEM

CUT AND

TAPE OFF!

Reversing

Valve

Energized in

Heat, Off,

Emergency

Mode

SYSTEM

MONITOR

SWITCH

Reversing

Valve

Energized in

Cool Mode

2nd Stage

Compressor

Fan

Relay

Limit or

Safety

Emergency

Heat

Relay

HOT

Switches

20 VAC

NEUTRAL

24 VAC

Aux

Heat

Relay

Compressor

Contactor

Hot

4 VAC

120 VAC

Neutral

TWO COMMONS MUST

BE JUMPERED TOGETHER!

TRANSFORMER

Class II Current Limited)

(

Figure 3.Typical wiring diagram for two transformer heat pump systems with NO safety circuits

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” alkaline batteries.

WIRING DIAGRAMS

NOTE

Polarity must be observed. If the HOT side of the second transformer

is jumpered to the COMMON side of the first transformer a short will

be made. Damage to equipment will occur when power is restored.

E/W1

THERMOSTAT

SYSTEM

Limit or

Safety

Switches

Limit or

Safety

Switches

HOT

Reversing

Valve

Energized in

Heat, Off,

Emergency

Mode

24 VAC

120 VAC

Emergency

Heat

Relay

SYSTEM

MONITOR

SWITCH

Reversing

Valve

Energized in

Cool Mode

2nd Stage

Compressor

Fan

Relay

NEUTRAL

24 VAC

Auxiliary

Heating

Transformer

(Class II

ACCESSORY

RELAY N.O.

CONTACT

NOTE

Aux

Heat

Relay

Compressor

Contactor

The accessory relay scheme

is required when safety

circuits exist in both systems.

Current Limited)

COMMON

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Limit or

Safety

Switches

Switches HOT

COMMON

24 VAC

120 VAC

NEUTRAL

Heat Pump Transformer

Class II Current Limited)

(

Figure 4.Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH 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” alkaline batteries.

Heat Pump Terminal Outputs

Refer to equipment manufacturers' instructions for specific one transformer. If transformer safety circuits are in only one of

system wiring information.

the systems, remove the transformer of the system with NO

safety circuits. If required, replace remaining transformer with a

You can configure the thermostat for use with the following

heat pump system types:

HEAT PUMP TYPE 1. Single stage compressor system; gas

or electric backup.

75VAClassIItransformer. Afterdisconnectingonetransformer,

the two commons must be jumpered together.

Use the terminal output information below to help you wire the

thermostat properly for your heat pump system. After wiring,

see CONFIGURATION section for proper thermostat configu-

ration.

This thermostat is designed to operate a single-transformer

system. If you have a two-transformer system, cut and tape off

THERMOSTAT TERMINALS (HEAT PUMP)

W2 E/W1 Y2 Y1

SYSTEM

Heat

Pump 1

Fault

24 Volt 24 Volt Heat Mode Emergency

Heat and Blower/Fan Energized Energized Energized

Output Cool mode on call for Heat in Cool in Heat

1st stage and Cool Mode OFF

Indicator (Common) (Hot) 2nd stage,

Mode

or System

Malfunction

Switch

Emergency 1st stage

Mode 2nd

Heat

Pump 2

2nd

stage

compressor

(compressor) Set GAS/ELEC switch

for Emergency mode

Emergency

mode

stage

Heat Mode

rd stage,

Emergency

Mode 2nd

stage

*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” alkaline batteries.

E/W1

THERMOSTAT

SYSTEM

Compressor

Contactor

Stage 2

Heat

Relay

Reversing

Valve

Reversing

Valve

Stage 1

Hot

Energized in

Cool Mode

Energized in

Heat Mode

Off Emergency

24 VAC

120 VAC

Compressor

Contactor

Stage 1

Heat

Relay

Fan

Neutral

TRANSFORMER

Class II, Current Limited)

Relay

Stage 2

(

Figure 5.Typical wiring diagram for single transformer multi-stage 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” alkaline batteries.

Multi-Stage Terminal Outputs

Refer to equipment manufacturers' instructions for specific one transformer. If transformer safety circuits are in only one of

system wiring information.

the systems, remove the transformer of the system with NO

safety circuits. If required, replace remaining transformer with a

You can configure the thermostat for use with either multi-stage

electric heat systems or multi-stage gas systems. When config-

ured for electric heat, the G terminal (blower/fan) will be

energized on a call for heat.

75VAClassIItransformer. Afterdisconnectingonetransformer,

the two commons must be jumpered together.

Use the terminal output information below to help you wire the

thermostat properly for your multi-stage system. After wiring,

see CONFIGURATION section for proper thermostat configu-

ration.

This thermostat is designed to operate a single-transformer

system. If you have a two-transformer system, cut and tape off

THERMOSTAT TERMINALS (MULTI-STAGE)

W2 E/W1 Y2 Y1

SYSTEM

Multi-stage Malfunction 24 Volt 24 Volt Heat Mode Heat mode Cool Mode Cool Mode Blower/Fan Energized Energized Energized

Light

(Common) (Hot) 2nd stage 1st stage 2nd stage 1st stage on call for Cool (and

in Cool in Heat, Off,

Heat if configured

to Electric Heat)

Mode

Emergency

Modes

*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” alkaline batteries.

CHECK THERMOSTAT OPERATION

Emergency System

NOTE

EMER bypasses the Heat Pump to use the heat source wired

to terminal E on the thermostat. EMER is typically used when

compressor operation is not desired, or you prefer back-up

heat only.

To prevent static discharge problems, touch side of

thermostat to release static build-up before touching

any keys.

. Press SYSTEM button to select EMER. “EMER” will flash

on the display.

If at any time during testing your system does not operate

properly, contact a qualified service person.

2. Press

to adjust thermostat setting above room

temperature. The Aux. heating system will begin to

operate. The display will show “STG1” flashing “EMER”

Fan Operation

If your system does not have a G terminal connection, skip to

Heating System.

and Flame icon ( ) to indicate that the Aux. system is

operating.

. Adjust temperature setting to 3° above room temperature.

The auxiliary heat system should begin to operate and

the display should show “STG1+2”.

. Turn on power to system.

. Move FAN switch to ON position. The blower should be-

gin to operate.

. Move FAN switch to AUTO position. The blower should

. Press

to adjust the thermostat below room tempera-

stop immediately.

ture. The Aux. heating system should stop operating.

CAUTION

To prevent compressor and/or property damage, if the

outdoor temperature is below 50°F, DO NOT operate

the cooling system.

Do not allow the compressor to run unless the com-

pressor oil heaters have been operational for 6 hours

and the system has not been operational for at least 5

minutes.

Cooling System

. Press SYSTEM button to select the Snowflake icon ( ).

Heating System

. Press SYSTEM button to select the Flame icon ( ). If

the auxiliary heating system has a standing pilot, be sure

to light it.

2. Press

to adjust thermostat setting below room

temperature. The blower should come on immediately on

high speed, followed by cold air circulation. The display

should show “STG1”.

2. Press

to adjust thermostat setting to 1° above room

temperature. The heating system should begin to

operate. The display should show “STG1”. However, if

the setpoint temperature display is flashing, the compres-

sor lockout feature is operating (see Configuration menu,

item 5).

3. Adjust temperature setting to 3° below room temperature.

The second stage cooling should begin to operate and

the display should show “STG1+2”.

4. Press

to adjust the temperature setting above room

temperature. The cooling system should stop operating.

. Adjust temperature setting to 3° above room temperature.

If your system configuration is set at MS2, HP2 or HP1,

the auxiliary heat system should begin to operate and the

display should show “STG1+2”.

4. Press to adjust the thermostat below room tempera-

ture. The heating system should stop operating.

OPERATION

Before you begin programming your thermostat, you should be

familiar with its features and with the display and the location

and operation of the thermostat buttons. Your thermostat con-

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

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

line up the cover with the base and press until the cover snaps

onto the base.

The Thermostat Buttons and Switches

Raises temperature setting

Lowers temperature setting.

FAN switch (ON, AUTO)

SYSTEM button (COOL, AUTO, HEAT, EMER, OFF)

STG1+2

FAULT

EMER

The Display

Flame icon ( ) is displayed when the system is in

HEAT mode. Snowflake icon ( ) is displayed when

Figure 6 – Thermostat display, buttons and switches

the system is in COOL mode. Flame icon ( ) and

Snowflake icon ( ) are displayed simultaneously

when thermostat is in AUTO mode.

Displays “BATT” when the 2 "AA" batteries are low

and should be replaced. Only “BATT” and “LO” in the

minutes field are displayed when batteries are low and

with no system power.

12 “FAULT” will be displayed when there is a malfunction

in the HEAT/COOL system.

Display ( ) when limited HEAT/COOL range is activated.

The “ ” icon will flash if an attempt is made to adjust

the temperature beyond the limited HEAT/COOL

temperature range.

Displays current temperature or “LO” in the minutes

field when batteries are low.

Displays set temperature (this is blank when SYSTEM

is OFF).

Stage 1 & 2 indicators: The thermostat shall indicate

when the first and second stage is energized except

in emergency mode. The icon is “STG 1” for the first

stage energized. The icons for the first and second

stage energized are “STG1+2” located in the upper

right side of the display.

Displays “FLTR” when the system has run for the

programmed filter time period as a reminder to change

or clean your filter.

Display ( ) when in keypad lockout mode.

“EMER” is displayed flashing when the system is in

EMER mode.

CONFIGURATION MENU

The configuration menu allows you to set certain thermostat 1) Single Stage, Multi-stage or Heat Pump System

operating characteristics to your system or personal require-

ments.

Configuration – This control can be configured for Heat

Pump or two stage heat/two stage cool multi-stage opera-

tion. The display indicates “MS 2” (default for multi-stage

mode) in the display. The Multi-stage configuration can be

Set SYSTEM button to OFF, then simultaneously press

and

to enter configuration menu. The display will

toggled to “SS1”, “HP2”, or “HP1” by pressing the

show the first item in the configuration menu.

key. In Multi-stage configuration, SYSTEM button will not

have EMERgency mode.

The configuration menu table summarizes the configuration

options. An explanation of each option follows.

) Fast or Slow Cycle Selection – The factory default setting

is fast cycle, which cycles 1st stage at approximately 1.2°F

and 2nd stage 0.75°F. If you prefer slow cycle, press the

Press SYSTEM to change to the next menu item. To exit the

menu and return to the program operation, press RUN. If no

keys are pressed within fifteen minutes, the thermostat will

revert to normal operation.

key to change to SL. The 1st stage and 2nd

stage would be 1.5°F and 1.2°F respectively.

CONFIGURATION MENU

Press the SYSTEM button until OFF is displayed, then press the

and

simultaneously

INSTALLER/CONFIGURATION MENU

Press

Displayed

Press

Step

Button(s) (Factory Default)

to select

Comments

System

MS 2

SS1, HP2, HP1

Selects Single stage, Multi-stage, or Heat Pump

(Single stage or 2-stage) System Configuration

System

Selects Fast or Slow Cycle Selection

Selects Compressor Lockout CL OFF or ON

(OFF)

(ON)

System

CDL

Selects Backlight Display

Selects Fast Second Stage ON or OFF

Selects filter replacement run time

(ON)

(OFF)

(ON)

System

0 FLTR

50-1950 (increments of 50)

0°F

4 LO to 4 HI

Selects Temperature Display Adjustment 4 LO to 4 HI

(Room Temperature)

System

°F

°C

Selects temperature display F° or °C selection

AU On

OFF

Selects AUTO Mode ON or OFF

(

Not available on earlier models)

System

LR 62 to LR89

LR 46 to LR 82

Selects Limited HEAT range

(90)

Selects Limited COOL range

Feature Not Available

(45)

OFF)

(ON)

(

(ON)

Selects Keypad Lockout

(

OFF)

001 to 999

Selects Keypad lockout combination number

Press System to set code

Returns to the OFF position

) Select Compressor Lockout CL OFF or ON – Selecting

CL ON will cause the thermostat to wait 5 minutes before

turning on the compressor if the heating and cooling system

loses power. It will also wait 5 minutes minimum between

cooling and heating cycles. This is intended to help protect

the compressor from short cycling. Some newer compres-

sors already have a time delay built in and do not require

this feature. Your compressor manufacturer can tell you if

the lockout feature is already present in their system. When

the thermostat compressor time delay occurs it will flash the

setpoint for about five minutes.

the light on continuously. Select backlight OFF will keep

the light on momentarily after any key is pressed. When the

C terminal is not powered, this selection has no effect.

) Select (Fast) Second Stage ON or OFF – In the run mode,

if the setpoint temperature is manually raised by 3°F (2°C)

or more above the actual temperature with the , and the

fast second stage feature is enabled, FA ON, the second

stage will energize immediately. With FA OFF, second

stage will not energize until the setpoint temperature is 1°F

or more above actual temperature for more than ten min-

utes.

) Select Backlight Display – The display backlight improves

display contrast in low lighting conditions. When the C

terminal is powered, selecting backlight CdL ON will turn

CONFIGURATION MENU

6) Select filter replacement run time – The thermostat will 13 & 14) Keypad Lockout – This menu selection will display

display FLTR after a set time of operation. This is a remind-

er to change or clean your air filter. This time can be set from

lock icon ( ) and “OFF” (default, keypad not locked out).

The and are used to toggle the selection between OFF

and ON (keypad locked out). When the keypad lockout

selection is enabled (ON), and the SYSTEM button is

pressed again, the display will indicate the number “0”

to 1950 hours in 50 hour increments. A selection of 000

will cancel this feature. When “FLTR” is displayed, you

can clear it by pressing SYSTEM. This resets the timer and

starts counting the hours until the next filter change. Contact

your system manufacturer for a specific replacement/main

tenance interval.

(default, still disabled) in the time digits. The

and

are

used to set the combination number from 0 to 999. If a

combination of 0 is selected and the SYSTEM button is

pressed, the menu will be exited and keypad will not be

locked. If 1 to 999 is selected and the SYSTEM button is

pressed, the combination is stored into memory and the

menu is exited. The ( ) will display designating keypad

locked with a valid combination. The SYSTEM button will

operate for 10 seconds after the menu mode is exited to

allow the user to change the mode from OFF to the desired

SYSTEM mode.

) Select Temperature Display Adjustment 4 LO to 4 HI –

Allows you to adjust the room temperature display up to 4°

higher or lower. Your thermostat was accurately calibrated

at the factory but you have the option to change the display

temperature to match your previous thermostat. The cur-

rent or adjusted room temperature will be displayed on the

left side of the display.

) Select F° or C° Readout – Changes the display readout

to Centigrade or Fahrenheit as required.

While the keypad is locked out, a simultaneous press of

and

will enter the configuration menu from any

) Selected Auto mode – This control will feature AUTO

changeover mode when AU on is selected (default). Press

mode instead of only OFF mode. When the menu is

entered with the keypad lockout feature enabled, the first

the

keys (not available on earlier models) to defeat

menu item displayed is the combination code 0. The

the auto changeover mode (OFF).

keys are used to set the combination unlock number

from 0 to 999. If the unlock number matches exactly with

the combination lock number stored in memory when the

SYSTEM button is pressed, the keypad is unlocked and

the ( ) is removed. If the unlock number does not match

when the SYSTEM button is pressed, the menu is exited

and the keypad remains disabled.

0)Limited Heat Range – This feature provides a maximum

setpoint temperature for heat. The default setting is 90°F. It

can be changed between 62°F and 89°F by pressing the

key.

1)Limited Cool Range – This feature provides a minimum

setpoint temperature for cool. The default setting is 45°F. It

can be changed between 46°F and 82°F by pressing the

To reset the combination code and unlock the keypad if

the code is forgotten, see troubleshooting section.

key.

2)This Feature Not Available.

SPECIFICATIONS

ELECTRICAL DATA

THERMAL DATA

Electrical Rating:

Setpoint Temperature Range:

45°F to 90°F (7°C to 32°C)

Operating Ambient Temperature Range:

32°F to 105°F

0 to 30 VAC 50/60 Hz or DC

.05 to 1.5 Amps (Load per terminal)

.5 Amps Maximum Total Load (All terminals combined)

Operating Humidity Range:

to 90% RH (non-condensing)

Shipping Temperature Range:

40°F to 150°F

OPERATION

The system "mode" is selected by pressing the SYSTEM the room temperature is 70° with the equipment using only the

button. Icons on the bottom right corner of the display will first stage of heat. Since the equipment is keeping the tempera-

indicatethemode: COOL( ), AUTO(

), HEAT ( ),EMER, ture within 1° of setpoint, the thermostat will delay second stage

or OFF. In any mode except OFF, the setpoint temperature will for a longer time if you manually raise the temperature or if the

be shown on the right side of the display. In OFF, this area will room temperature quickly changes. Once the second stage

be blank. The current temperature will be displayed on the left comes on, it will come on sooner the next time there is a

side of the display.

difference between the setpoint and the room temperature. The

net effect of the staging program is that when the first stage is

capable of making temperature the second stage will delay

longer. When the thermostat calculates that first stage cannot

make temperature in a reasonable time, the second stage will

come on sooner. This built in function automatically optimizes

the use of additional stages of heat or cool.

To operate properly in the AUTO mode, the heat setpoint

temperature cannot be the same as or higher than the cool

setpoint temperature. The heat setpoint must be at least 1°

lower than the cool setpoint.

Automatic System Changeover

When the thermostat is in the AUTO mode, both theFlame and

Snowflake icons are displayed. The thermostat will call for heat

or cool depending on the room temperature. The setpoint

temperature displayed will be that of the last mode called. If the

lastsystemcyclewasheat, the HEAT setpointwillbedisplayed.

IftheroomtemperatureraisesabovetheHEAT setpointandthe

COOL setpoint and a call for cool is required, the temperature

displayed will change to be the COOL setpoint.

LOW BATTERY INDICATOR

Ifthe2“AA”alkalinebatteriesarelowandshouldbereplaced,

the display will be blank except for “

LO BATT”. We recom-

mend replacing batteries every 2 years. If the home is going

to be unoccupied for an extended period (over 3 months),

the batteries should be replaced before leaving. When the

batteries are low, pressing any button will cause the display

tooperatedfortenseconds. Aftertenseconds, thedisplaywill

be blank except for “LO BATT”. You cannot program with low

batteries, but you can override setpoint temperature. After

Second Stage Time Delay

Your thermostat is designed to determine the optimum time to

activate the second stage. Simply raising the temperature in

heating or lowering it in cooling will not always force the

thermostat to bring the second stage on quickly. There is a time

delay from 0-30 minutes depending on the performance of the

first stage of the system.

“

LO BATT” has been displayed for 4 weeks, the thermostat

will raise the temperature 10 degrees above your setpoint in

COOL mode and will drop the temperature 10 degrees below

your setpoint in HEAT mode. If the “LO BATT” condition

continues, and when it reaches certain value, the thermostat

will turn off all the loads and “LO BATT” will flash.

EXAMPLE: For the last 2 hours the thermostat is set on 70° and

TROUBLESHOOTING

Reset Operation

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermo-

stat by removing the wires from terminals R and C and removing batteries for 2 minutes. After resetting the thermostat,

replace the wires and batteries. If the thermostat has been reset and still does not function correctly, contact your heating/

cooling service person or place of purchase.

Symptom

Possible Cause

Corrective Action

No Heat/No Cool/No Fan

1. Blown fuse or tripped circuit breaker.

2. Furnace power switch to OFF.

Replace fuse or reset breaker.

Turn switch to ON.

(

common problems)

. Furnace blower compartment door or

panel loose or not properly installed.

Replace door panel in proper position to engage

safety interlock or door switch.

No Heat

1. Pilot light not lit.

Re-light pilot.

. SYSTEM button not set to HEAT.

Press SYSTEM button to HEAT and raise setpoint

above room temperature.

Verify thermostat and system wires are securely

attached.

Many furnaces have safety devices that shut down

when a lock-out condition occurs. If the heat works

intermittently contact the furnace manufacturer or

local service person for assistance.

. Loose connection to thermostat or

system.

. Furnace Lock-Out Condition. Heat

may also be intermittent.

TROUBLESHOOTING

Symptom

Possible Cause

Corrective Action

No Heat (continued)

5. Heating system requires service or

thermostat requires replacement.

Diagnostic: Press SYSTEM button to HEAT and

raise the setpoint above room temperature. Within a

few seconds the thermostat should make a soft click

sound. This sound usually indicates the thermostat

is operating properly. If the thermostat does not

click, try the reset operation listed above. If the

thermostat does not click after being reset contact

your heating and cooling service person or place of

purchase for a replacement. If the thermostat clicks,

contact the furnace manufacturer or a service

person to verify the heating is operating correctly.

No Cool

1. SYSTEM button not pressed to COOL. Press SYSTEM button to COOL and lower setpoint

below room temperature.

2. Loose connection to thermostat or

system.

Verify thermostat and system wires are securely

attached.

3. Cooling system requires service or

thermostat requires replacement.

Same procedure as diagnostic for No Heat condition

except set the thermostat to COOL and lower the

setpoint below the room temperature. There may be

up to a five minute delay before the thermostat

clicks in Cooling.

. Possible short in wiring.

. Possible short in thermostat.

. Possible short in heat/cool/fan

system.

Check each wire connection to verify they are not

shorted or touching together. No bare wire should

stick out from under terminal screws. Try resetting

the thermostat as described above. If the condition

persists the manufacturer of your system or service

person can instruct you on how to test the Heat/Cool

system for correct operation. If the system operates

correctly, replace the thermostat.

Heat, Cool or Fan

Runs Constantly

4. FAN Switch set to Fan On.

. The location of the thermostat and/or

the size of the Heating System may

be influencing the cycle rate.

Digital thermostats normally provide precise

temperature control and may cycle faster than some

older mechanical models. A faster cycle rate means

the unit turns on and off more frequently but runs for

a shorter time so there is no increase in energy use.

If you would like to increase the cycle time, choose

SL for slow cycle in the menu, step 4. If an accept-

able cycle rate is not achieved as received or by

choosing slow cycle, contact a local service person

for additional suggestions.

Furnace

(Air Conditioner)

Cycles Too Fast

or Too Slow (narrow or

wide temperature swing)

Thermostat Setting &

Thermostat Thermometer

Disagree

1. Thermostat thermometer setting

requires adjustment.

The thermometer can be adjusted +/- 4 degrees.

See Temperature Display Adjustment in the

Configuration Menu section.

Blank Display and/or

1. Voltage spike or static discharge.

Use the Reset Operation at top of previous page.

Keypad Not Responding

Heat Setpoint will

not Respond to the

Temperature Up Key

1. The desired setpoint conflicts with the Change system mode to COOL. Raise the Cool

setpoint. Return to HEAT mode and set desired

setpoint of the COOL mode.

temperature.

Cool Setpoint will

not Respond to the

Temperature Down Key

1. The desired setpoint conflicts with the Change system mode to HEAT. Lower the Heat

setpoint. Return to COOL mode and set desired

setpoint of the HEAT mode.

temperature.

TROUBLESHOOTING

Symptom

Possible Cause

Corrective Action

Forgot Keypad

Lockout Code

CAUTION: This resets the thermostat to factory

default settings of the configuration menu. After

performing this reset, the thermostat will require

configuration again. Be sure that you know the

required configuration settings before resetting.

With the thermostat in any mode, press

and

the same time to enter the configuration menu at the

point where the lockout code is to be entered. Press

and

and SYSTEM button at the same time to

reset the lockout code, unlock the keypad and reset

all configuration menu settings.

Why won't my 2nd or 3rd First Stage is keeping up with

Your thermostat is designed to determine the

optimum time to activate the second stage. Simply

raising the temperature in heating or lowering it in

cooling will not always force the thermostat to bring

the second stage on quickly. There is a time delay

from 0-30 minutes depending on the performance of

the first stage of the system.

stage come on?

demand

FAQ

Symptom

Corrective Action

My thermostat is reading in Celsius.

How do I change it to Fahrenheit?

Your thermostat display can be set to display temperature in Fahrenheit or

Celsius. This option can be set in the INSTALLER/CONFIGURATION MENU

of your thermostat. See page 6 step 12.

My display light does not work. Can it be

fixed or replaced?

Because it is soldered to the circuit board it is not possible to repair or

replace.

My setpoint temperature is flashing.

What does that mean?

When the thermostat compressor time delay occurs it will flash the setpoint

for about five minutes. This is intended to help protect the compressor from

short cycling.

How can I get a copy of the Operating

Manual for my thermostat?

Visit our website at www.white-rodgers.com for operating manuals.

NOTES

HOMEOWNER HELP LINE: 1-800-284-2925

The Emerson logo is a

trademark and service mark

of Emerson Electric Co.

St. Louis, Missouri

Markham, Ontario