White Rodgers 1F83-277 User Manual

1F83-2771F83-277

1F83-277

1F83-2771F83-277

Heating & Air Conditioning

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

Pump Thermostat

INSTALLATION INSTRUCTIONSINSTALLATION INSTRUCTIONS

INSTALLATION INSTRUCTIONS

INSTALLATION INSTRUCTIONSINSTALLATION INSTRUCTIONS

Operator: Save these instructions for future use!Operator: Save these instructions for future use!

Operator: Save these instructions for future use!

Operator: Save these instructions for future use!Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFOREFAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFOREFAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONALINSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONALINSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.INJURY AND/OR PROPERTY DAMAGE.

INJURY AND/OR PROPERTY DAMAGE.

INJURY AND/OR PROPERTY DAMAGE.INJURY AND/OR PROPERTY DAMAGE.

PREPARATIONSPREPARATIONS

PREPARATIONS

PREPARATIONSPREPARATIONS

YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES

YOUR THERMOSTAT REPLACES

YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES

DescriptionDescription

Description

DescriptionDescription
Heat Pump (No Aux. or Emergency Heat) Yes
Heat Pump (with Aux. or Emergency Heat) Yes
Standard Heat & Cooling Systems Yes
Two Stage Heat & Two Stage Cool Yes
Standard Heat Only Systems Yes
Millivolt Heat Only Systems – Floor or Wall Furnaces Yes
Standard Central Air Conditioning Yes
Gas or Oil Heat Yes
Electric Furnace Yes
Hydronic (Hot Water) Zone Heat – 2 Wires Yes
Hydronic (Hot Water) Zone Heat – 3 Wires No

Assemble tools required as shown below.

FLAT BLADE SCREWDRIVER

HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT

REMOVING OLD THERMOSTAT

REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT

WIRE CUTTER/STRIPPER

CAUTION

!

To prevent electrical shock and/or equipment dam-To prevent electrical shock and/or equipment dam-

To prevent electrical shock and/or equipment dam-

To prevent electrical shock and/or equipment dam-To prevent electrical shock and/or equipment dam­age, disconnect electric power to system at main fuseage, disconnect electric power to system at main fuse

age, disconnect electric power to system at main fuse

age, disconnect electric power to system at main fuseage, disconnect electric power to system at main fuse
or circuit breaker box until installation is complete.or circuit breaker box until installation is complete.

or circuit breaker box until installation is complete.

or circuit breaker box until installation is complete.or circuit breaker box until installation is complete.

Before removing wires from old thermostat's switching sub-

label each wirelabel each wire

base,

label each wire with the terminal designation it was

label each wirelabel each wire

removed from.

1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.

Remove Old ThermostatRemove Old Thermostat

2.

Remove Old Thermostat: A standard heat/cool

Remove Old ThermostatRemove Old Thermostat
thermostat consists of three basic parts:
a. The cover, which may be either a snap-on or

hinge type.

b. The base, which is removed by loosening all

captive screws.

c. The switching subbase, which is removed by

unscrewing the mounting screws that hold it on
the wall or adaptor plate.

3. Remove the front cover of the old thermostat.
wireswires

still attachedstill attached

wires

still attached, remove wall plate from the wall. If

wireswires

still attachedstill attached
the old thermostat has a wall mounting plate, remove the
thermostat and the wall mounting plate as an assembly.

4. Identify each wire attached to the old thermostat.

5. Disconnect the wires from the old thermostat one at a
DO NOT LET WIRES FALL BACK INTO THEDO NOT LET WIRES FALL BACK INTO THE

time.

DO NOT LET WIRES FALL BACK INTO THE

DO NOT LET WIRES FALL BACK INTO THEDO NOT LET WIRES FALL BACK INTO THE

WALLWALL

WALL.

WALLWALL

6. Install new thermostat using the following procedures.

WithWith

With

WithWith

Y2

C
R

E/W1

Y1

Mounting
Hole

Figure 1 – Thermostat baseFigure 1 – Thermostat base

Figure 1 – Thermostat base

Figure 1 – Thermostat baseFigure 1 – Thermostat base

ATTENTION!ATTENTION!

ATTENTION! This product does not contain mercury. How-

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

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

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 return to White-Rodgers at 2895 Harrison
Street, Batesville, AR 72501 for proper disposal.

OBLW2G

ELEC. GAS

AUTOON

Mounting
Hole

Elec-Gas
Switch

notnot

not

notnot

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com

PART NO. 37-6509APART NO. 37-6509A

PART NO. 37-6509A

PART NO. 37-6509APART NO. 37-6509A

0405

MOUNTING AND WIRINGMOUNTING AND WIRING

MOUNTING AND WIRING

MOUNTING AND WIRINGMOUNTING AND WIRING

WARNING

!

Do not use on circuits exceeding specified voltage.Do not use on circuits exceeding specified voltage.

Do not use on circuits exceeding specified voltage.

Do not use on circuits exceeding specified voltage.Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could causeHigher voltage will damage control and could cause

Higher voltage will damage control and could cause

Higher voltage will damage control and could causeHigher voltage will damage control and could cause
shock or fire hazard.shock or fire hazard.

shock or fire hazard.

shock or fire hazard.shock or fire hazard.

Do not short out terminals on gas valve or primaryDo not short out terminals on gas valve or primary

Do not short out terminals on gas valve or primary

Do not short out terminals on gas valve or primaryDo not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damagecontrol to test. Short or incorrect wiring will damage

control to test. Short or incorrect wiring will damage

control to test. Short or incorrect wiring will damagecontrol to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/orthermostat and could cause personal injury and/or

thermostat and could cause personal injury and/or

thermostat and could cause personal injury and/orthermostat and could cause personal injury and/or
property damage.property damage.

property damage.

property damage.property damage.

Thermostat installation and all components of the
system shall conform to Class II circuits per the NEC
code.

Electric/Gas Switch (Fan Option)Electric/Gas Switch (Fan Option)

Electric/Gas Switch (Fan Option)

Electric/Gas Switch (Fan Option)Electric/Gas Switch (Fan Option)

The ELEC/GAS switch is factory set to the ELEC position. In
this position, the thermostat will power the circulator fan on a
call for heat. Electric heat systems require the switch to be in the
ELEC position.

If your system does not require that the thermostat power the
circulator fan, this switch should be set to the GAS position.
Typically, gas and oil heating systems do not require the
thermostat to power the circulator fan during a call for heat. If
your heat is gas or oil, the switch should be set to the GAS
position.

When the thermostat is configured for Heat Pump, the thermo­stat 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.

All wiring diagrams are for typical systems only. Refer to
equipment manufacturers' instructions for specific system wir­ing information.

CAUTION

!

Take care when securing and routing wires so they doTake care when securing and routing wires so they do

Take care when securing and routing wires so they do

Take care when securing and routing wires so they doTake care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.not short to adjacent terminals or rear of thermostat.

not short to adjacent terminals or rear of thermostat.

not short to adjacent terminals or rear of thermostat.not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.Personal injury and/or property damage may occur.

Personal injury and/or property damage may occur.

Personal injury and/or property damage may occur.Personal injury and/or property damage may occur.

Attach Thermostat Base to WallAttach Thermostat Base to Wall

Attach Thermostat Base to Wall

Attach Thermostat Base to WallAttach Thermostat Base to Wall

1. 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.

2. Connect wires beneath terminal screws on base using
appropriate wiring schematic (see figs. 2 through 4).

3. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.

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

5. 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.

6. Push excess wire into wall and plug hole with a fire­resistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.

Battery LocationBattery Location

Battery Location

Battery LocationBattery Location

2 "AA" alkaline batteries are included in the thermostat at the
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 with fresh "AA" Energizer® alkaline batteries. To
replace batteries, set system to OFF, install the batteries
along the top of the base (see Fig. 1). The batteries must be
installed with the positive (+) end to the left.

O

Reversing Valve

Energized in Cool

Mode

CUT AND

TAPE OFF!

HOT

120 VAC

NEUTRAL

2

E/W1

Reversing Valve

Energized in Heat,

Off, Emergency

Reversing

Energized in

24 VAC

Cool Mode

B

Mode

Figure 2. Typical wiring diagram for single transformer heat pump systems

O

Reversing

Valve

Energized in

Heat, Off,

Emergency

Compressor

B

Valve

Mode

Y2

2nd Stage

2nd Stage

Compressor

G W2

Compressor

Contactor

If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.

Y2

Compressor

Contactor

Fan

Relay

NOTE

G W2

Fan

Relay

Aux

Relay

(Stage 2)

Aux

Relay

(Stage 2)

TWO COMMONS MUST
BE JUMPERED TOGETHER!

Emergency

or 1st Aux.

E/W1

Emergency

or 1st Aux.

Stage
Relay

Stage
Relay

CY1

CY1

SYSTEM

MONITOR

SWITCH

SYSTEM

MONITOR

SWITCH

24 VAC

(Class II Current Limited)

L

Limit or

Safety

Switches

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

L

THERMOSTAT

R

SYSTEM

Hot

120 VAC

TRANSFORMER

THERMOSTAT

R

24 VAC

(Class II Current Limited)

Neutral

SYSTEM

TRANSFORMER

Hot

120 VAC

Neutral

WIRING DIAGRAMSWIRING DIAGRAMS

WIRING DIAGRAMS

WIRING DIAGRAMSWIRING DIAGRAMS

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.

O

Reversing

Valve

Energized in

Cool Mode

B

Reversing

Valve

Energized in

Heat, Off,

Emergency

Mode

Y2

2nd Stage

Compressor

Compressor

Contactor

G W2

Fan

Relay

Aux

Relay

(Stage 2)

E/W1

Emergency

or 1st Aux.

Stage Relay

TWO COMMONS MUST
BE JUMPERED TOGETHER!

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

Heat Pump Terminal OutputsHeat Pump Terminal Outputs

Heat Pump Terminal Outputs

Heat Pump Terminal OutputsHeat Pump Terminal Outputs

Refer to equipment manufacturers' instructions for specific
system wiring information.

You can configure the thermostat for use with the following
heat pump system types:
HEAT PUMP TYPE 1HEAT PUMP TYPE 1

HEAT PUMP TYPE 1. Single stage compressor system; gas

HEAT PUMP TYPE 1HEAT PUMP TYPE 1
or electric backup.

This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape off

NOTE

CY1

SYSTEM

MONITOR

SWITCH

L

COMMON

R

Switches

Limit or

Safety

Switches

Limit or

Safety

ACCESSORY

RELAY N.O.

CONTACT

THERMOSTAT

SYSTEM

24 VAC

24 VAC

COMMON

24 VAC 120 VAC

Heat Pump Transformer

(Class II Current Limited)

Auxiliary

Heating

Transformer

(Class II

Current Limited)

Limit or

Safety

Switches

120 VAC

The accessory relay scheme
is required when safety
circuits exist in both systems.

Limit or

Safety

Switches

HOT

NEUTRAL

NOTE

HOT

NEUTRAL

one transformer. If transformer safety circuits are in only one of
the systems, remove the transformer of the system with NO
safety circuits. If required, replace remaining transformer with
a 75VA Class II transformer. After disconnecting one trans­former, 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,

CONFIGURATION CONFIGURATION

see

CONFIGURATION section for proper thermostat configu-

CONFIGURATION CONFIGURATION

ration.

THERMOSTAT TERMINALS (HEAT PUMP)THERMOSTAT TERMINALS (HEAT PUMP)

THERMOSTAT TERMINALS (HEAT PUMP)

THERMOSTAT TERMINALS (HEAT PUMP)THERMOSTAT TERMINALS (HEAT PUMP)

SYSTEMSYSTEM

SYSTEM

SYSTEMSYSTEM

LL

L

LL

CC

C

CC

RR

R

RR

W2W2

W2

W2W2

E/W1E/W1

E/W1

E/W1E/W1

Y2Y2

Y2

Y2Y2

Y1Y1

Y1

Y1Y1

GG

G

GG

OO

O

OO

BB

B

BB

Heat Malfunction 24 Volt 24 Volt Heat Mode Heat mode No Heat and Blower/Fan Energized Energized Energized
Pump 1 Light (Common) (Hot) 3rd stage 2nd stage Output Cool mode on call for Heat in Cool in Heat

Emergency or 1st stage and Cool Mode OFF
Heat mode Emergency 2nd (compressor) Set GAS/ELEC switch Emergency
Pump 2 2nd stage Mode stage for Emergency mode mode

1st stage compressor

O

Reversing

Valve

Energized in

Cool Mode

B

Reversing

Valve

Energized in

Heat Mode

Off Emergency

Y1

Compressor

Contactor

Stage 1

Y2

Compressor

Contactor

Stage 2

G

Fan

Relay

E/W1

Heat

Relay

Stage 1

W2

Heat

Relay

Stage 2

C R

THERMOSTAT

SYSTEM

Hot

24 VAC 120 VAC

Neutral

TRANSFORMER

(Class II, Current Limited)

Figure 5. Typical wiring diagram for single transformer multi-stage systems

3

Multi-Stage Terminal OutputsMulti-Stage Terminal Outputs

Multi-Stage Terminal Outputs

Multi-Stage Terminal OutputsMulti-Stage Terminal Outputs

Refer to equipment manufacturers' instructions for specific
system wiring information.

You can configure the thermostat for use with either multi-stage
electric heat systems or multi-stage gas systems. When con­figured for
energized on a call for heat.

This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape off

SYSTEMSYSTEM

SYSTEM

SYSTEMSYSTEM

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

CHECK THERMOSTAT OPERATIONCHECK THERMOSTAT OPERATION

CHECK THERMOSTAT OPERATION

CHECK THERMOSTAT OPERATIONCHECK THERMOSTAT OPERATION

electric electric

electric heat, the

electric electric

LL

L

LL

Light (Common) (Hot) 2nd stage 1st stage 2nd stage 1st stage on call for Cool (and in Cool in Heat, Off,

GG

G terminal (blower/fan) will be

GG

THERMOSTAT TERMINALS (MULTI-STAGE)THERMOSTAT TERMINALS (MULTI-STAGE)

THERMOSTAT TERMINALS (MULTI-STAGE)

THERMOSTAT TERMINALS (MULTI-STAGE)THERMOSTAT TERMINALS (MULTI-STAGE)

CC

C

CC

RR

R

RR

W2W2

W2 E

W2W2

/W1/W1

/W1

/W1/W1

NOTE

To prevent static discharge problems, touch side ofTo prevent static discharge problems, touch side of

To prevent static discharge problems, touch side of

To prevent static discharge problems, touch side ofTo prevent static discharge problems, touch side of
thermostat to release static build-up before touchingthermostat to release static build-up before touching

thermostat to release static build-up before touching

thermostat to release static build-up before touchingthermostat to release static build-up before touching
any keys.any keys.

any keys.

any keys.any keys.

If at any time during testing your system does not operate
properly, contact a qualified serviceperson.

Fan OperationFan Operation

Fan Operation

Fan OperationFan Operation

If your system does not have a
Heating SystemHeating System

Heating System.

Heating SystemHeating System

1. Turn on power to system.

2. Move fan switch to
to operate.

3. Move fan switch to
stop immediately.

ON ON

ON position. The blower should begin

ON ON

AUTO AUTO

AUTO position. The blower should

AUTO AUTO

!

Do not allow the compressor to run unless the com-Do not allow the compressor to run unless the com-

Do not allow the compressor to run unless the com-

Do not allow the compressor to run unless the com-Do not allow the compressor to run unless the com­pressor oil heaters have been operational for 6 hourspressor oil heaters have been operational for 6 hours

pressor oil heaters have been operational for 6 hours

pressor oil heaters have been operational for 6 hourspressor oil heaters have been operational for 6 hours
and the system has not been operational for at leastand the system has not been operational for at least

and the system has not been operational for at least

and the system has not been operational for at leastand the system has not been operational for at least
5 minutes.5 minutes.

5 minutes.

5 minutes.5 minutes.

Heating SystemHeating System

Heating System

Heating SystemHeating System

1. Press SYSTEM button to select the
the auxiliary heating system has a standing pilot, be sure
to light it.

2. Press
temperature. The heat pump system should begin to
operate. The display should show STG1. However, if the
set point temperature display is flashing, the compressor
lockout feature is operating (see Configuration menu,
item 5).

3. 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 STG 1+2.

4. Press
ture. The heating system should stop operating.

to adjust thermostat setting to 1° above room

to adjust the thermostat below room tempera-

G G

G terminal connection, skip to

G G

CAUTION

Flame iconFlame icon

Flame icon ( ). If

Flame iconFlame icon

one transformer. If transformer safety circuits are in only one of
the systems, remove the transformer of the system with NO
safety circuits. If required, replace remaining transformer with
a 75VA Class II transformer. After disconnecting one trans­former, 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,

CONFIGURATION CONFIGURATION

see

CONFIGURATION section for proper thermostat configu-

CONFIGURATION CONFIGURATION

ration.

Y2Y2

Y2

Y2Y2

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.

1. Press SYSTEM button to select EMER. EMER will flash
on the display.

2. Press to adjust thermostat setting above room
temperature. The Aux. heating system will begin to
operate. The display will show STG1 flashing EMER

and flame icon (
operating.

3. Adjust temperature setting to 3° above room temperature.
The auxiliary heat system should begin to operate and the
display should show STG 1+2.

4. Press
ture. The Aux. heating system should stop operating.

To prevent compressor and/or property damage, ifTo prevent compressor and/or property damage, if

To prevent compressor and/or property damage, if

To prevent compressor and/or property damage, ifTo prevent compressor and/or property damage, if
the outdoor temperature is below 50°F, DO NOTthe outdoor temperature is below 50°F, DO NOT

the outdoor temperature is below 50°F, DO NOT

the outdoor temperature is below 50°F, DO NOTthe outdoor temperature is below 50°F, DO NOT
operate the cooling system.operate the cooling system.

operate the cooling system.

operate the cooling system.operate the cooling system.

1. Press SYSTEM button to select the

2. Press
temperature. The blower should come on immediately on
high speed, followed by cold air circulation. The display
should show STG1.

3. Adjust temperature setting to 3° below room temperature.
The second stage cooling should begin to operate and
the display should show STG 1+2.

4. Press
temperature. The cooling system should stop operating.

Y1Y1

Y1

Y1Y1

Emergency SystemEmergency System

Emergency System

Emergency SystemEmergency System

) to indicate that the Aux. system is

to adjust the thermostat below room tempera-

!

Cooling SystemCooling System

Cooling System

Cooling SystemCooling System

to adjust thermostat setting below room

to adjust the temperature setting above room

GG

G

GG

Heat if configured Mode Emergency

to Electric Heat) Modes

OO

O

OO

BB

B

BB

CAUTION

Snowflake iconSnowflake icon

Snowflake icon ( ).

Snowflake iconSnowflake icon

4

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
consists 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 SwitchesThe Thermostat Buttons and Switches

The Thermostat Buttons and Switches

The Thermostat Buttons and SwitchesThe Thermostat Buttons and Switches

Raises temperature setting

1

Lowers temperature setting.

2

ONON

FAN switch (

3

ON,

ONON

AUTOAUTO

AUTO)

AUTOAUTO

OPERATIONOPERATION

OPERATION

OPERATIONOPERATION

SYSTEM button (

4

Flame iconFlame icon

Flame icon ( ) is displayed when the system is in

Flame iconFlame icon

5

HEAT HEAT

HEAT mode.

HEAT HEAT
the system is in

Snowflake icon Snowflake icon

Snowflake icon (

Snowflake icon Snowflake icon
when thermostat is in

Displays

6

should be replaced. Only
when batteries are low with no system power.

Displays current temperature or

7

are low.
Displays currently programmed set temperature (this

8

is blank when SYSTEM is OFF).
Displays

9

programmed filter time period as a reminder to change
or clean your filter.

Display ( ) when in keypad lockout mode.

10

BATT BATT

BATT when the 2 "AA" batteries are low and

BATT BATT

FLTR FLTR

FLTR when the system has run for the

FLTR FLTR

COOLCOOL

COOL,

COOLCOOL

The DisplayThe Display

The Display

The DisplayThe Display

Snowflake icon Snowflake icon

Snowflake icon (

Snowflake icon Snowflake icon

COOL COOL

COOL mode.

COOL COOL

AUTOAUTO

AUTO,

AUTOAUTO

) are displayed simultaneously

AUTO AUTO

AUTO mode.

AUTO AUTO

HEATHEAT

HEAT,

HEATHEAT

) is displayed when

Flame iconFlame icon

Flame icon ( ) and

Flame iconFlame icon

BATT BATT

BATT and

BATT BATT

LO LO

LO are displayed

LO LO

LO LO

LO when batteries

LO LO

EMEREMER

EMER,

EMEREMER

OFFOFF

OFF)

OFFOFF

STG1+2

EMER

Figure 6 – Thermostat display, buttons and switchesFigure 6 – Thermostat display, buttons and switches

Figure 6 – Thermostat display, buttons and switches

Figure 6 – Thermostat display, buttons and switchesFigure 6 – Thermostat display, buttons and switches

EMER EMER

EMER is displayed flashing when the system is in

EMER EMER

11

EMER mode.
Indicates a fault in the heating/cooling system. It does

12

not indicate a fault in the thermostat.
Display ( ) when limited range is activated.

13

Stage1 & 2Stage1 & 2

Stage1 & 2 indicators: The thermostat shall indicate

Stage1 & 2Stage1 & 2

14

when the first and second stage is energized except
in emergency mode. The icon is
stage energized. The icons for the first and second
stage energized are
right side of the display.

STG1+2STG1+2

STG1+2 located in the upper

STG1+2STG1+2

CONFIGURATION MENUCONFIGURATION MENU

CONFIGURATION MENU

CONFIGURATION MENUCONFIGURATION MENU

FAULT

STG 1STG 1

STG 1 for the first

STG 1STG 1

The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal require­ments.

SYSTEM SYSTEM

Set

SYSTEM button to

SYSTEM SYSTEM

and to enter configuration menu. The display will

show the first item in the configuration menu.

The configuration menu table summarizes the configuration
options. An explanation of each option follows.

SYSTEM SYSTEM

Press

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

SYSTEM SYSTEM
menu and return to the program operation, press
keys are pressed within fifteen minutes, the thermostat will
revert to normal operation.

Single Stage, Multi-stage or Heat Pump SystemSingle Stage, Multi-stage or Heat Pump System

1)

Single Stage, Multi-stage or Heat Pump System

Single Stage, Multi-stage or Heat Pump SystemSingle Stage, Multi-stage or Heat Pump System
ConfigurationConfiguration

Configuration – This control can be configured for Heat

ConfigurationConfiguration
Pump or two stage heat/two stage cool multi-stage opera­tion. The display indicates
mode) in the display. The Multi-stage configuration can be

SS1SS1

toggled to
ture Upture Up

ture Up or

ture Upture Up
ration, system button will not have

HP2HP2

SS1,

HP2, or

SS1SS1

HP2HP2

Temperature DownTemperature Down

Temperature Down key. In Multi-stage configu-

Temperature DownTemperature Down

OFFOFF

OFF, then simultaneously press

OFFOFF

RUNRUN

RUN. If no

RUNRUN

MS 2MS 2

MS 2 (default for multi-stage

MS 2MS 2

HP1HP1

HP1 by pressing the

HP1HP1

EMEREMER

EMERgency mode.

EMEREMER

Tempera-Tempera-

Tempera-

Tempera-Tempera-

Fast or Slow Cycle SelectionFast or Slow Cycle Selection

2)

Fast or Slow Cycle Selection – The factory default setting

Fast or Slow Cycle SelectionFast or Slow Cycle Selection
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
temperature key to change to SL. The 1st stage and 2nd
stage would be 1.5°F and 1.2°F respectively.

Select Compressor Lockout CL OFF or ONSelect Compressor Lockout CL OFF or ON

3)

Select Compressor Lockout CL OFF or ON – Selecting

Select Compressor Lockout CL OFF or ONSelect Compressor Lockout CL OFF or ON
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 compres­sors 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.

5

CONFIGURATION MENUCONFIGURATION MENU

CONFIGURATION MENU

CONFIGURATION MENUCONFIGURATION MENU

StepStep

Step

StepStep

1

2
3

4

5

6
7

8
9

10

11

12
13

14

Press the System button until

INSTALLER/CONFIGURATION MENUINSTALLER/CONFIGURATION MENU

INSTALLER/CONFIGURATION MENU

INSTALLER/CONFIGURATION MENUINSTALLER/CONFIGURATION MENU

PressPress

Press

PressPress

Button(s)Button(s)

Button(s)

Button(s)Button(s)

SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem
SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem
SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem
SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem

SystemSystem

System

SystemSystem

SystemSystem

System Returns to the OFF position

SystemSystem

DisplayedDisplayed

Displayed

DisplayedDisplayed

(Factory Default)(Factory Default)

(Factory Default)

(Factory Default)(Factory Default)

MS 2MS 2

MS 2

MS 2MS 2

FAFA

FA

FAFA

CLCL

CL

CLCL

(OFF)(OFF)

(OFF)

(OFF)(OFF)

CDLCDL

CDL

CDLCDL

(ON)(ON)

(ON)

(ON)(ON)

FAFA

FA

FAFA

(ON)(ON)

(ON)

(ON)(ON)

0 FLTR0 FLTR

0 FLTR

0 FLTR0 FLTR

0°F0°F

0°F

(Room Temperature)

0°F0°F

°F°F

°F

°F°F

LRLR

LR

LRLR

(90)(90)

(90)

(90)(90)

LRLR

LR

LRLR

(45)(45)

(45)

(45)(45)

CACA

CA

CACA

(OFF)(OFF)

(OFF)

(OFF)(OFF)
(OFF)(OFF)

(OFF)

(OFF)(OFF)

00

0

00

OFF OFF

OFF is displayed, then press the and simultaneously

OFF OFF

Press Press

Press

Press Press

SS1, HP2, HP1SS1, HP2, HP1

SS1, HP2, HP1 Selects Single stage, Multi-stage, or Heat Pump

SS1, HP2, HP1SS1, HP2, HP1

50-195050-1950

50-1950 (increments of 50) Selects filter replacement run time

50-195050-1950

LR 62 to LR89LR 62 to LR89

LR 62 to LR89 Selects Limited

LR 62 to LR89LR 62 to LR89

LR 46 to LR 82LR 46 to LR 82

LR 46 to LR 82 Selects Limited COOL range

LR 46 to LR 82LR 46 to LR 82

or or

or

or or

to selectto select

to select

to selectto select

(Single stage or 2-stage) System Configuration

SLSL

SL Selects Fast or Slow Cycle Selection

SLSL
CLCL

CL Selects Compressor Lockout

CLCL

(ON)(ON)

(ON)

(ON)(ON)

CDLCDL

CDL Selects Backlight Display

CDLCDL

(OFF)(OFF)

(OFF)

(OFF)(OFF)

FAFA

FA Selects Fast Second Stage

FAFA

(OFF)(OFF)

(OFF)

(OFF)(OFF)

4 LO to 4 HI4 LO to 4 HI

4 LO to 4 HI Selects Temperature Display Adjustment

4 LO to 4 HI4 LO to 4 HI

°C°C

°C For

°C°C

CACA

CA Feature Not Available

CACA

(ON)(ON)

(ON)

(ON)(ON)
(ON)(ON)

(ON) Selects Keypad Lockout

(ON)(ON)

001 to 999001 to 999

001 to 999 Selects Keypad lockout combination number

001 to 999001 to 999

CommentsComments

Comments

CommentsComments

CL OFFCL OFF

CL OFF or

CL OFFCL OFF

ON ON

ON or

ON ON

°C°C

°C selection

°C°C

HEAT HEAT

HEAT range

HEAT HEAT

Press System to set code

ONON

ON

ONON

OFFOFF

OFF

OFFOFF

4 LO4 LO

4 LO to

4 LO4 LO

4 HI4 HI

4 HI

4 HI4 HI

Select Backlight DisplaySelect Backlight Display

4)

Select Backlight Display – The display backlight improves

Select Backlight DisplaySelect Backlight Display
display contrast in low lighting conditions. When the "C"
terminal is powered, selecting backlight CdL ON will keep
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, the light will be on momentarily
after any key is pressed no matter the backlight is selected
ON or OFF.

Select (Fast) Second Stage ON or OFFSelect (Fast) Second Stage ON or OFF

5)

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

Select (Fast) Second Stage ON or OFFSelect (Fast) Second Stage ON or OFF
if the setpoint temperature is manually raised by 3°F (2°C)
or more above the actual temperature with 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 min­utes.

Select filter replacement run timeSelect filter replacement run time

6)

Select filter replacement run time – The thermostat will

Select filter replacement run timeSelect filter replacement run time

FLTR FLTR

display

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

FLTR FLTR
er to change or clean your air filter. This time can be set from
0 to 1950 hours in 50 hour increments.
will cancel this featurewill cancel this feature

will cancel this feature. When

will cancel this featurewill cancel this feature
clear it by pressing

HOLD HOLD

HOLD and

HOLD HOLD

FLTR FLTR

FLTR is displayed, you can

FLTR FLTR

RUN RUN

RUN at the same time. This

RUN RUN

A selection of 000A selection of 000

A selection of 000

A selection of 000A selection of 000

resets the timer and starts counting the hours until the next
filter change. Contact your system manufacturer for a
specific replacement/maintenance interval.

, and the

Select Temperature Display Adjustment 4 LO to 4 HISelect Temperature Display Adjustment 4 LO to 4 HI

7)

Select Temperature Display Adjustment 4 LO to 4 HI –

Select Temperature Display Adjustment 4 LO to 4 HISelect 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 cur­rent or adjusted room temperature will be displayed on the
left side of the display.

Select F° or C° Readout Select F° or C° Readout

8)

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

Select F° or C° Readout Select F° or C° Readout

to Centigrade or Fahrenheit as required.

Limited Heat Range Limited Heat Range

9)

Limited Heat Range – This feature provides a maximum

Limited Heat Range Limited Heat Range

setpoint temperature for heat. The default setting is 90°F. It
can be changed between 62°F and 89°F by pressing the
temperature uptemperature up

temperature up or

temperature uptemperature up

Limited Cool RangeLimited Cool Range

10)

Limited Cool Range – This feature provides a minimum

Limited Cool RangeLimited Cool Range

temperature downtemperature down

temperature down key.

temperature downtemperature down

setpoint temperature for cool. The default setting is 45°F. It
can be changed between 46°F and 82°F by pressing the
temperature up or temperature down key.

This feature not availableThis feature not available

11)

This feature not available.

This feature not availableThis feature not available

6

CONFIGURATION MENUCONFIGURATION MENU

CONFIGURATION MENU

CONFIGURATION MENUCONFIGURATION MENU

12 & 13)

ELECTRICAL DATAELECTRICAL DATA

ELECTRICAL DATA

ELECTRICAL DATAELECTRICAL DATA

Electrical RatingElectrical Rating

Electrical Rating:

Electrical RatingElectrical Rating

Keypad LockoutKeypad Lockout

Keypad Lockout – This menu selection will display

Keypad LockoutKeypad Lockout

lock lock

lock icon. The

lock lock
display the
default) indicating in the time digits to the
(keypad locked out). When the keypad lockout function is
enabled (
display will indicate the number
the time digits. The and are used to set the combina­tion number from
If a combination of
pressed the menu will be exited and keypad lockout will not
be evoked. If
pressed again, the combination is locked into non-volatile
memory and the menu is exited. The
keypad locked with a valid combination) will display when
the menu is exited. The system key will operate for 10
seconds after the menu mode is exited to allow the user to
change the mode from

20 to 30 VAC 50/60 Hz or DC

0.05 to 1.5 Amps (Load per terminal)

2.5 Amps Maximum Total Load (All terminals combined)

and are used to toggle the function and

lock lock

lock icon and

lock lock

ONON

ON), and the

ONON

00

0 to

00

1 to 9991 to 999

1 to 999 is selected and the

1 to 9991 to 999

OFF OFF

OFF (keypad not locked out,

OFF OFF

lock lock

lock icon and

lock lock

SYSTEM SYSTEM

SYSTEM key is pressed again, the

SYSTEM SYSTEM

0 0

0 (default, still disabled) in

0 0

999999

00

999. "

0" will not be a valid combination.

999999

00

00

0 is selected and the system key is

00

lock lock

lock icon (to designate

lock lock

OFF OFF

OFF to the desired system mode.

OFF OFF

SYSTEM SYSTEM

SYSTEM key is

SYSTEM SYSTEM

While the keypad is locked out, a simultaneous press of the
temperature
mode instead of only

ONON

ON

ONON

entered with the keypad lockout feature enabled, the
menu item displayed is the combination code

keys are used to set the combination unlock number

00

from

0 to

00
combination lock number stored in memory when the
SYSTEM SYSTEM

SYSTEM key is pressed, the keypad is unlocked and the

SYSTEM SYSTEM
lock lock

lock icon is removed. If the unlock number does not match

lock lock
when the
keypad remains disabled.

To reset the combination code and unlock the keypad if the
code is forgotten, see troubleshooting section.

THERMAL DATATHERMAL DATA

THERMAL DATA

THERMAL DATATHERMAL DATA

Setpoint Temperature RangeSetpoint Temperature Range

Setpoint Temperature Range:

Setpoint Temperature RangeSetpoint Temperature Range

45°F to 90°F (7°C to 32°C)

Operating Ambient Temperature RangeOperating Ambient Temperature Range

Operating Ambient Temperature Range:

Operating Ambient Temperature RangeOperating Ambient Temperature Range

32°F to 105°F

Operating Humidity RangeOperating Humidity Range

Operating Humidity Range:

Operating Humidity RangeOperating Humidity Range

0 to 90% RH (non-condensing)

Shipping Temperature RangeShipping Temperature Range

Shipping Temperature Range:

Shipping Temperature RangeShipping Temperature Range

-40°F to 150°F

and will enter the menu item from any

OFF modeOFF mode

OFF mode. When the menu is

OFF modeOFF mode

999999

99 9. If the unlock number matches exactly with the

999999

SYSTEM SYSTEM

SYSTEM key is pressed, menu is exited and the

SYSTEM SYSTEM

first

00

0. The or

00

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONSSPECIFICATIONS

The system "mode" is selected by pressing the SYSTEM
button. Icons on the bottom right corner of the display will
indicate the mode:

OFFOFF

or

OFF. In any mode except

OFFOFF
be shown on the right side of the display. In
be blank. The current temperature will be displayed on the left
side of the display.

To operate properly in the
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 ChangeoverAutomatic System Changeover

Automatic System Changeover

Automatic System ChangeoverAutomatic System Changeover

When the thermostat is in the
Snowflake Snowflake

Snowflake icons are displayed. The thermostat will call for heat

Snowflake Snowflake
or cool depending on the room temperature. The setpoint
temperature displayed will be that of the last mode called. If the
last system cycle was heat, the
If the room temperature raises above the
COOL COOL

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

COOL COOL
displayed will change to be the

COOL COOL

COOL (

COOL COOL

AUTO AUTO

),

AUTO ( ),

AUTO AUTO

OFFOFF

OFF, the setpoint temperature will

OFFOFF

AUTO AUTO

AUTO mode, the heat setpoint

AUTO AUTO

AUTO AUTO

AUTO mode, both the

AUTO AUTO

HEAT HEAT

HEAT setpoint will be displayed.

HEAT HEAT

COOL COOL

COOL setpoint.

COOL COOL

HEAT HEAT

HEAT ( ),

HEAT HEAT

OFFOFF

OFF, this area will

OFFOFF

HEAT HEAT

HEAT setpoint and the

HEAT HEAT

EMEREMER

EMER,

EMEREMER

Flame Flame

Flame and

Flame Flame

OPERATIONOPERATION

OPERATION

OPERATIONOPERATION

Second Stage Time DelaySecond Stage Time Delay

Second Stage Time Delay

Second Stage Time DelaySecond 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.

EXAMPLE: For the last 2 hours the thermostat is set on 70° and
the room temperature is 70° with the equipment using only the
first stage of heat. Since the equipment is keeping the tempera­ture within 1 degree of setpoint, the thermostat will delay second
stage for a longer time if you manually raise the temperature or
if the room temperature quickly changes. Once the second
stage comes on, it will come on sooner the next time there is a
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.

7

TROUBLESHOOTINGTROUBLESHOOTING

TROUBLESHOOTING

TROUBLESHOOTINGTROUBLESHOOTING

Reset OperationReset Operation

Reset Operation

Reset OperationReset Operation

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

SymptomSymptom

Symptom

SymptomSymptom

No Heat/No Cool/No FanNo Heat/No Cool/No Fan

No Heat/No Cool/No Fan

No Heat/No Cool/No FanNo Heat/No Cool/No Fan
(common problems)(common problems)

(common problems)

(common problems)(common problems)

No HeatNo Heat

No Heat

No HeatNo Heat

Possible CausePossible Cause

Possible Cause

Possible CausePossible Cause

1. Blown fuse or tripped circuit breaker.

2. Furnace power switch to OFF.

3. Furnace blower compartment door or
panel loose or not properly installed.

1. Pilot light not lit.

2. System Switch not set to HEAT.

3. Loose connection to thermostat or
system.

4. Furnace Lock-Out Condition. Heat
may also be intermittent.

5. Heating system requires service or
thermostat requires replacement.

Corrective ActionCorrective Action

Corrective Action

Corrective ActionCorrective Action

Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.

Re-light pilot.
Set System Switch 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.
Diagnostic: Set System Switch 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 CoolNo Cool

No Cool

No CoolNo Cool

Heat, Cool or FanHeat, Cool or Fan

Heat, Cool or Fan

Heat, Cool or FanHeat, Cool or Fan
Runs ConstantlyRuns Constantly

Runs Constantly

Runs ConstantlyRuns Constantly

FurnaceFurnace

Furnace

FurnaceFurnace
(Air Conditioner)(Air Conditioner)

(Air Conditioner)

(Air Conditioner)(Air Conditioner)
Cycles Too FastCycles Too Fast

Cycles Too Fast

Cycles Too FastCycles Too Fast
or Too Slow (narrow oror Too Slow (narrow or

or Too Slow (narrow or

or Too Slow (narrow oror Too Slow (narrow or
wide temperature swing)wide temperature swing)

wide temperature swing)

wide temperature swing)wide temperature swing)

1. System Switch not set to COOL.

2. Loose connection to thermostat or
system.

3. Cooling system requires service or
thermostat requires replacement.

1. Possible short in wiring.

2. Possible short in thermostat.

3. Possible short in heat/cool/fan
system.

4. Fan Switch set to Fan On.

1. The location of the thermostat and/or
the size of the Heating System may
be influencing the cycle rate.

Set System Switch to COOL and lower setpoint
below room temperature.
Verify thermostat and system wires are securely
attached.
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.

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.

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
If an acceptable cycle rate is not achieved as
received or by choosing slow cycle, contact a local
service person for additional suggestions.

SL SL

SL for slow cycle in the menu, step 4.

SL SL

8

TROUBLESHOOTINGTROUBLESHOOTING

TROUBLESHOOTING

TROUBLESHOOTINGTROUBLESHOOTING

SymptomSymptom

Symptom

SymptomSymptom

Thermostat Setting &Thermostat Setting &

Thermostat Setting &

Thermostat Setting &Thermostat Setting &
Thermostat ThermometerThermostat Thermometer

Thermostat Thermometer

Thermostat ThermometerThermostat Thermometer
DisagreeDisagree

Disagree

DisagreeDisagree

Blank Display and/orBlank Display and/or

Blank Display and/or

Blank Display and/orBlank Display and/or
Keypad Not RespondingKeypad Not Responding

Keypad Not Responding

Keypad Not RespondingKeypad Not Responding

Heat Setpoint willHeat Setpoint will

Heat Setpoint will

Heat Setpoint willHeat Setpoint will
not Respond to thenot Respond to the

not Respond to the

not Respond to thenot Respond to the
Temperature Up KeyTemperature Up Key

Temperature Up Key

Temperature Up KeyTemperature Up Key

Cool Setpoint willCool Setpoint will

Cool Setpoint will

Cool Setpoint willCool Setpoint will
not Respond to thenot Respond to the

not Respond to the

not Respond to thenot Respond to the
Temperature Down KeyTemperature Down Key

Temperature Down Key

Temperature Down KeyTemperature Down Key

Forgot KeypadForgot Keypad

Forgot Keypad

Forgot KeypadForgot Keypad
Lockout CodeLockout Code

Lockout Code

Lockout CodeLockout Code

Possible CausePossible Cause

Possible Cause

Possible CausePossible Cause

1. Thermostat thermometer setting
requires adjustment.

1. Voltage spike or static discharge.

1. The desired setpoint conflicts with the
setpoint of the COOL mode.

1. The desired setpoint conflicts with the
setpoint of the HEAT mode.

Corrective ActionCorrective Action

Corrective Action

Corrective ActionCorrective Action

The thermometer can be adjusted +/- 3 degrees.
See Temperature Display Adjustment in the
Configuration Menu section.

Use the Reset Operation at top of previous page.

Change system mode to COOL. Raise the Cool
setpoint. Return to HEAT mode and set desired
temperature.

Change system mode to HEAT. Lower the Heat
setpoint. Return to COOL mode and set desired
temperature.

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
at the same time to enter the configuration menu at
the point where the lockout code is to be entered.
Press
time to reset the lockout code, unlock the keypad
and reset all configuration menu settings.

and and SYSTEM button at the same

and

Why won't my 2nd orWhy won't my 2nd or

Why won't my 2nd or

Why won't my 2nd orWhy won't my 2nd or
3rd stage come on?3rd stage come on?

3rd stage come on?

3rd stage come on?3rd stage come on?

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.

9

The Emerson logo is a
trademark and a service mark
of Emerson Electric Co.