White Rodgers IF73 User manual

Installation Instructions for
Heating & Air Conditioning
IF73
Non- Programmable, Auto Changeover
Multi-stage/Heat PumpThermostat
CONTENTS
Preparations.................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat .........................1-2
Mounting and Wiring ..................................2-4
Check Thermostat Operation .....................5-6
Specifications ................................................ 6
Operation ...................................................... 6
Troubleshooting .........................................7-8
PREPARATIONS
THERMOSTAT DETAILS REMOVING OLDTHERMOSTAT
Before removing wires from old thermostat’s switching subbase,
labeleachwirewiththeterminaldesignationitwasremovedfrom.
1. 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.
b. Thebase,whichisremovedbylooseningallcaptivescrews.
c. The switching subbase, which is removed by unscrewing
themountingscrewsthatholditonthewalloradaptorplate.
2. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
3. Removethefrontcover ofthe oldthermostat.With wiresstill
attached,removewallplatefromthewall.Iftheoldthermostat
hasawallmountingplate,removethethermostatandthewall
mounting plate as an assembly.
4. Identify each wire attached to the old thermostat.
5. Disconnectthewiresfromtheoldthermostatoneatatime.DO
NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main
fuse or circuit breaker until installation is complete.
CAUTION
!
Printed in U.S.A. PART NO. 37-6429A
0230
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
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Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
Assemble tools required as shown below.
YOURTHERMOSTAT REPLACES
1
23
WIRE CUTTER/STRIPPER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
Description 1F73
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 No
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
* Requires common for 24 VAC at the thermostat
(O/B)Y2 E/W1 R C
Y1 W2 G
GASELEC
B
O
L
Figure 1. Thermostat Base
Elec – Gas
Switch
Mounting
Hole
Mounting
Hole
O/B Terminal
Switches Selection

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MOUNTING ANDWIRING
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.
CAUTION
!
ATTENTION! This product does not contain mercury. How-
ever, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing non-absorbent gloves, take
up the spilled mercury and place into a container which can be
sealed.Ifa cellbecomesdamaged,the unitshouldbediscarded.
Mercurymustnotbediscardedinhouseholdtrash.Whentheunit
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.
REMOVING OLDTHERMOSTAT
CONTINUED FROM PAGE 1
WARNING
!
4
3
Electric/Gas Switch (Fan Option)
The ELEC/GAS switch is factory set to the GAS position. In this
position, the thermostat will not power the circulator fan on a call
for heat.
If your system requires that the thermostat power the circulator
fanthisswitchmust beset tothe ELEC position.On amulti-stage
system, the thermostat will power the circulator fan on a call for
heat. On a Heat Pump system, the thermostat will power the
circulatorfanonacallfor secondstageheat when thethermostat
is in Emergency mode.
O/B Terminal Switch Selection
The O/B switch on this thermostat is factory set to “O” position.
This will accommodate the majority of heat pump applications,
which require the changeover relay to be energized in COOL. If
thethermostatyouare replacingorthe heatpumpbeing installed
with this thermostat requires a “B” terminal, to energize the
changeover relay in HEAT, the O/B switch must be moved to the
“B” position.
For multi-stage, the switch must be in “O” position for “Y2” to
operate properly.
Attach Thermostat Base to Wall
1. Removethepackingmaterial fromthethermostat. Gentlypull
the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.
2. Connectwires beneathterminal screwsonbase usingappro-
priate wiring schematic (see figs. 2 through 4).
3. Placebaseoverholeinwallandmarkmountingholelocations
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
mountingscrews.Placealevelagainstbottomofbase,adjust
until level, and then tighten screws. (Leveling is for appear-
ance only and will not affect thermostat operation.) If you are
using existing mounting holes, or if holes drilled are too large
anddo notallow youtotighten basesnugly, useplasticscrew
anchors to secure subbase.
6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostatandcouldcausepersonalinjuryand/orprop-
erty damage.
Thermostat installation and all components of the sys-
tem shall conform to Class II circuits per the NEC code.

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MOUNTING ANDWIRING
CONTINUED FROM PAGE 2
4
LR
E/W1
24 VAC 120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 2. Typical wiring diagram for single transformer heat pump systems
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
CY1
O/B/Y2
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay Emergency
Relay
See Note **
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
LR
E/W1
SYSTEM
MONITOR
SWITCH
G W2
Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems
Changeover
Relay*
CY1
O/B/Y2
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay Emergency
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC 120 VAC
HOT
NEUTRAL
THERMOSTAT
SYSTEM
HOT
NEUTRAL
120 VAC
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
24 VAC
Limit or
Safety
Switches
COMMON
COMMON
Auxiliary
Heating
Transformer
(Class II
Current Limited)
Heat Pump Transformer
(Class II Current Limited)
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
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.
NOTE
The accessory relay scheme
is required when safety
circuits exist in both systems.
NOTE
See Note **
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
LR
E/W1
24 VAC 120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 3. Typical wiring diagram for two transformer heat pump systems with NO safety circuits
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
CY1
O/B/Y2
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay Emergency
Relay
Limit or
Safety
Switches
TWO COMMONS MUST
BE JUMPERED TOGETHER!
HOT
NEUTRAL
120 VAC 24 VAC
CUT AND
TAPE OFF!
If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.
NOTE
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
See Note **

MOUNTING ANDWIRING
CONTINUED FROM PAGE 3
4
C* R
O/B/Y2*
Compressor
Contactor
Stage 1
Heat
Relay
Stage 1
Heat
Relay
Stage 2
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1
E/W1
W2
Figure 5. Typical wiring diagram for single transformer multi-stage systems
Fan
Relay
G
TRANSFORMER
(Class II, Current Limited)
*O/B Switch must be in “O” position
Compressor
Contactor
Stage 2
Refer to equipment manufacturers’ instructions for specific sys-
tem wiring information.
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 Gterminal (blower/fan) will be ener-
gized on a call for heat.
This thermostat is designed to operate a single-transformer
system.Ifyouhaveatwo-transformersystem,cutandtapeofone
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
ClassIItransformer.Afterdisconnectingonetransformer,thetwo
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 configuration.
Multi-stage Terminal Outputs
Refer to equipment manufacturers’ instructions for specific sys-
tem wiring informtion.
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.
This thermostat is designed to operate a single-transformer
system.Ifyouhaveatwo-transformersystem,cutandtapeofone
Heat Pump Terminal Outputs
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
ClassIItransformer.Afterdisconnectingonetransformer,thetwo
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 configuration.
SYSTEM L C R W2 E/W1 (O/B)Y2* Y1 G
Malfunction
Light
Multi-Stage
*O/B switch must be in “O” position
24 Volt
(Common) 24 Volt (Hot) Heat mode 2nd stage Heat mode 1st stage Cool Mode 2nd stage Cool mode 1st stage Blower/Fan Energized on call for Cool (and
Heat if configured
to Electric Heat)
THERMOSTAT TERMINALS
SYSTEM L C R W2 E/W1 (O/B)Y2 Y1 G
Single-stage compressor system; gas or electric backup
Malfunction
Light
Heat Pump 1 24 Volt
(Common) 24 Volt (Hot) Heat mode 3rd stage.
Emergency mode
2nd stage
Heat mode
2nd stage No Output
B: Energized in Heat, Off,
Emergency Mode
O: Energized in Cool Mode
Heat and
Cool mode
1st stage
(compressor)
Blower/Fan Energized
on call for Heat
and Cool
THERMOSTAT TERMINALS
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CAUTION
!
CHECKTHERMOSTAT OPERATION
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NOTE
To prevent static discharge problems, touch side of ther-
mostattoreleasestaticbuild-upbeforetouchinganykeys.
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
If your system does not have a Gterminal connection, skip to
Heating System.
1. Turn on power to the system.
2. Move fan switch to ON position. The blower should begin to
operate.
3. Move fan switch to AUTO position. The blower should stop
immediately.
Donotallowthe compressor to run unless the compres-
soroilheatershavebeen operationalfor6 hoursandthe
system has not been operational for at least 5 minutes.
Heating System
1. PressSYSTEMkeytoselectthe Flameicon( ).If the auxiliary
heating system has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting to 1°above room
temperature.The heatpump systemshouldbegin tooperate.
However, if the Flame icon ( ) and Snowflake icon ( ) are
flashing, the compressor lockout feature is operating (see
Configuration menu, item 3.)
3. Adjusttemperaturesettingto4°aboveroomtemperature.The
auxiliary heat system should begin to operate and the Flame
icon ( ) will be flashing.
4. Press toadjustthermostatsettingbelowroomtempera-
ture. The heating system should stop operating.
Emergency System
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 key to select EMER. EMER will flash on the
display.
2. Press toadjustthermostatsettingaboveroomtempera-
ture. The Aux heating system will begin to operate. The
Flame icon ( ) will display flashing to indicate that the Aux
system is operating.
3. Press toadjust thethermostat belowroom temperature.
The Aux heating system should stop operating.
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system
Cooling System
1. Press SYSTEM key to select the Snowflake icon ( ).
2. Press to adjust thermostat setting below room tempera-
ture. The blower should come on immediately on high speed,
followed by cold air circulation.
3. Press to adjust temperature setting above room tem-
perature. The cooling system should stop operating.
Before you begin configuring your thermostat, you should be
familiarwith itsfeatures andwith thedisplay andthe locationand
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 Buttons and Switches
1
(Up arrow) Raises temperature setting.
2
(Down arrow) Lowers temperature setting.
3
FAN switch (ON, AUTO).
4
SYSTEM key (HEAT ( ), EMER*, OFF, COOL ( ),
AUTO ().
* EMER is available when H.P. is selected in the configuration
menu.
The Display
5
Indicates a malfunction with the system.
6
Flame icon ( ) is displayed when the SYSTEM mode is in
HEAT. Flame icon ( ) is displayed flashing when 2nd-stage
heat (Aux or Emergency) is energized. Snowflake icon ( )
is displayed (non-flashing) when the SYSTEM mode is in
COOL.SnowflakeandFlame iconsaredisplayedwhenthe
SYSTEM mode is in AUTO. Snowflake and Flame icons
are displayed (flashing) if the thermostat is in lockout mode
to prevent the compressor from cycling too quickly.
7
EMER is displayed flashing when the system switch is in
EMER position.
8
Displays current temperature.
5
CAUTION
!
6
FAN
ON
MODE
SYSTEM
AUTO
STG1+2
EMER

CHECKTHERMOSTAT OPERATION
CONTINUED FROM PAGE 4
5
1
Step Press Button(s) Displayed Press or
(Factory Default) to select:
2
HP
4*
Configuration Menu
3
Set SYSTEM
switch to OFF
no HP
and
for at least 2 seconds
and
momentarily
and
momentarily
SLFA
OFFL
˚C˚F
5
OFF
7
6
CL
(OFF) 3 LO TO
3 HI
FA
(ON)
and
momentarily
and
momentarily
and
momentarily
ON
0 HI
(0)
8
and
momentarily
* Not available on this model
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
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
SPECIFICATIONS
6
Configuration Menu
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal requirements.
The menu mode may be exited by pressing the system key to
change from the OFF mode or after 15 minutes has elapsed with
no keypad activity.
2. Multi-stageorHeatPumpOutputConfiguration–Thiscontrol
can be configured for Heat Pump or two stage heat/two stage
cool multi-stage operation. The display indicates no HP (de-
fault for multi-stage mode) in the display. The Multi-stage
configuration can be toggled to HP (Heat Pump mode) by
pressing the Temperature Up or Temperature Down key. In
Multi-stage configuration, system key selection will skip
EMERgency mode.
3. 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 tempera-
ture key to change to SL. The 1st stage and 2nd stage would
be 1.5˚F and 1.2˚F respectively.
4. Display light – Not available on this model.
5. In the run mode, if the setpoint temperature is manually raised
by 3°F (2°C) or more above the actual temperature with the
TEMPERATURE UP key,and thefast secondstagefeature is
enabled, FA on, the second stage will energize immediately.
With FA off, second stage will not energize until the setpoint
temperatureis1°Formore aboveactualtemperature formore
than ten minutes.
6. 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.Itwillalsowait5minutesminimumbetweencoolingand
heatingcycles.Thisisintendedtohelpprotectthecompressor
from short cycling. Some newer compressors already have a
time delay built in and do not require this feature. Your com-
pressor manufacturer can tell you if the lockout feature is
alreadypresentintheirsystem.Whenthethermostatcompres-
sor time delay occurs it will flash the Snowflake and Flame
Icons for about five minutes.
7. Select Temperature Display Adjustment 3 LO to 3 HI –
Allowsyoutoadjusttheroomtemperaturedisplayupto3°higher
or lower. Your thermostat was accurately calibrated at the
factorybutyouhavetheoptiontochangethedisplaytemperature
to match your previous thermostat. The current or adjusted
roomtemperaturewillbedisplayedontheleftsideofthedisplay.
8. ˚For˚CSelection–Thefactorydefaultsettingfortemperature
display is Fahrenheit. If you want the temperature in Celcius,
press temperature key to change to ˚C.
9
Displayscurrently programmedsettemperature (thisis blank
when SYSTEM switch is in the OFF position).
10
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 lower right side of the display.
OPERATION
Thesystem “mode”is selectedbypressing thesystemkey. Icons
on the bottom right corner of the display will indicate the mode;
COOL ( ), AUTO ( ), HEAT ( ), EMER, or OFF. In any mode
except OFF, the setpoint temperature will be shown on the right
side of the display. In OFF, this area will be blank. The current
temperature will be displayed on the left side of the display.
TooperateproperlyintheAUTOmode,theheatsetpointtempera-
ture 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. If you are unable to raise the setpoint temperature
in HEAT or lower the setpoint temperature in COOL, you may be
at the 1˚ difference. To obtain the temperature you wish to set,
change to the opposite mode and move that setpoint away from
your temperature.
7
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Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.
(common problems) 2. Furnace power switch to OFF. Turn switch to ON.
3. Furnace blower compartment door or Replace door panel in proper position to engage
panel loose or not properly installed. safety interlock or door switch.
No Heat 1. Pilot light not lit. Re-light pilot.
2. System Switch not set to HEAT. Set System Switch to HEAT and raise setpoint
above room temperature.
3. Loose connection to thermostat or system. Verify thermostat and system wires are securely
attached.
4. Furnace Lock-Out Condition. Heat may also Many furnaces have safety devices that shut
be intermittent. down when a lock-out condition occurs. If the
heat works intermittently contact the furnace
manufacturer or local service person for
assistance.
5. Heating system requires service or Diagonistic: Set System Switch to HEAT and raise
thermostat requires replacement. the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermo-
stat 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 Switch not set to COOL. Set System Switch 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 Same procedure as diagnostic for No Heat
thermostat requires replacement. 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.
Heat, Cool or Fan Runs Constantly. 1. Possible short in wiring. Check each wire connection to verify they are not
2. Possible short in thermostat. shorted or touching together. No bare wire should
3. Possible short in heat/cool/fan system. stick out from under terminal screws. Try resetting
4. Fan Switch set to Fan On. 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.
TROUBLESHOOTING
Reset Operation
Ifavoltagespikeorstaticdischargeblanksoutthedisplayorcauseserraticthermostatoperationyoucanresetthethermostatbyremoving
powerfromRterminal. Ifthethermostathaspower,hasbeenresetandstilldoesnotfunctioncorrectlycontactyourheating/coolingservice
person or place of purchase.
8
Automatic System Changeover
When the thermostat is in the AUTO mode, both the Flame and
Snowflake icons are displayed. The thermostat will call for heat
or cool depending on the room temperature. The setpoint tem-
perature displayed will be that of the last mode called. If the last
OPERATION
CONTINUED FROM PAGE 5
7
systemcyclewasheat,theHEATsetpointwillbedisplayed.Ifthe
roomtemperatureraisesabovetheHEATsetpointandtheCOOL
setpointand acall forcool isrequired, thetemperature displayed
will change to be the COOL setpoint.

Symptom Possible Cause Corrective Action
Furnace Cycles Too Fast or Too Slow 1. The location of the thermostat and/or the Digital thermostats normally provide precise
(narrow or wide temperature swing) size of the Heating System may be temperature control and may cycle faster than
influencing the cycle rate. 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, clip Jumper W-905 as
mentioned in the instructions for Hydronic Heating
Systems. It is not possible to shorten the cycle
time. If an acceptable cycle rate is not achieved as
received or by clipping W-905 contact a local
service person for additional suggestions.
Cooling Cycles Too Fast or Too Slow 1. The location of the thermostat and the size The cycle rate for cooling is fixed and can not be
(narrow or wide temperature swing) of the Cooling System can influence the adjusted. Contact a local service person for
cyclerate. suggestions.
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 3 degrees.
Thermometer Disagree adjustment. See Temperature Display Adjustment in the
Operation section.
Blank Display and/or Keypad Not 1. Voltage spike or static discharge. Use the Reset Operation listed above.
Responding
Heat Setpoint will not Respond 1. The desired setpoint conflicts with the Change system mode to COOL. Raise the Cool
to the Temperature Up Key setpoint of the COOL mode. setpoint. Return to HEAT mode and set desired
temperature.
Cool Setpoint will not Respond 1. The desired setpoint conflicts with the Change system mode to HEAT. Lower the Heat
to theTemperature Down Key setpoint of the HEAT mode. setpoint. Return to COOL mode and set desired
temperature.
TROUBLESHOOTING
CONTINUED FROM PAGE 7
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8