White Rodgers IF72 User manual

Installation Instructions for
Heating & Air Conditioning
IF72
5/2 Day Programmable
Heat PumpThermostat
CONTENTS
Preparations.................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat .........................1-2
Mounting and Wiring ..................................2-3
Check Thermostat Operation .....................4-5
Programming your Thermostat ..................6-7
Specifications ................................................ 7
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 old thermostat.With wires still
attached,removewallplatefromthewall.Iftheoldthermostat
hasawallmountingplate,removethethermostatandthewall
mounting plate as an assembly.
4. Identifyeachwireattachedtotheoldthermostatusingthe
labels enclosed with the new 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. 37-6367D
Replaces 37-6367C
0224
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
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
Description
Heat Pump (No Aux or Emergency Heat) Yes
Heat Pump (with Aux or Emergency Heat) Yes
Standard Heat & Cooling Systems No
Standard Heat Only Systems No
Millivolt Heat Only Systems – Floor or Wall Furnaces No
Standard Central Air Conditioning No
Gas or Oil Heat No
Electric Furnace No
Hydronic (Hot Water) Zone Heat – 2 Wires No
Hydronic (Hot Water) Zone Heat – 3 Wires No
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
Figure 1. Thermostat base
W905
Clip for
Slow Cycle
W904
Clip for
Celsius
Mounting
hole
W906 for Emergency
Heat Second Stage
Fan Control
O/B
Terminal
Switches
Selection
Mounting
hole
IF72

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 cellbecomes damaged,theunitshould bediscarded.
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 72501-2117 for proper disposal.
REMOVING OLDTHERMOSTAT
CONTINUED FROM FIRST PAGE
WARNING
!
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
thermostat and could cause personal injury and/or
property damage.
Thermostat installation and all components of the sys-
tem shall conform to Class II circuits per the NEC code.
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4
3
Electric/Gas Jumper (Fan Option)
Ifyouremergencyorauxiliarysystemwillenergizetheblower,then
jumper W906 on the thermostat base must be cut (see fig. 1).
If your emergency or auxiliary heat system requires that the
thermostat energize the fan circuit, do not cut jumper W906.
If you are unsure of your application, contact a qualified service
person.
°F or °C Selection
Thefactory defaultsetting fortemperature display isFahrenheit.
If you want the temperature in Celcius, clip jumper W904.
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, clip jump W905. The 1st stage and 2nd stage would be
1.5°F and 1.2°F respectively.
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 heat pumpbeing 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.
Attach Thermostat Base to Wall
1. Removethepackingmaterial fromthethermostat. Gently pull
the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.
2. Connectwires beneathterminal screwson baseusingappro-
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 youto tightenbasesnugly, useplastic screw
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.
Battery Location
Thisthermostatdoesnotrequirebatteriestooperate.The2“AAA”
alkaline batteries are for the thermostat to remember the pro-
gramming if AC voltage is lost. If the display shows BATT when
AC power is not present, the batteries are low and should be
replaced with fresh “AAA” Energizer®alkaline batteries. To re-
place the batteries, install the batteries along the top of the base
(see fig. 1). The batteries must be installed with the positive (+)
ends to the right.

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MOUNTING ANDWIRING
CONTINUED FROM SECOND PAGE
4
LR
E
24 VAC 120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 2. Typical wiring diagram for single transformer systems
TRANSFORMER
(Class II)
Changeover
Relay*
CYO/B
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
24 VAC 120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
TRANSFORMER
(Class II)
Changeover
Relay*
CYO/B
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 **
LR
E
SYSTEM
MONITOR
SWITCH
G W2
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
Changeover
Relay*
CYO/B
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)
Heat Pump Transformer
(Class II)
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

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. Move SYSTEM switch to HEAT position. 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 systemshould begintooperate.
However, if the Flame icon ( ) and Snowflake icon ( ) are
flashing, the compressor lockout feature is operating (see
Configuration menu, item 2.)
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. Move SYSTEM switch to EMER position. 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 belowroomtemperature.
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. Move SYSTEM switch to COOL position.
2. Press to adjust thermostat setting below room tempera-
ture. The blower should come on immediately on high speed,
followed by cold air circulation.
4. Press to adjust temperature setting above room tem-
perature. The cooling system should stop operating.
Before you begin programming your thermostat, you should be
familiarwith itsfeatures andwith thedisplay andthelocation and
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
TIME button.
4
PRGM (program) button.
5
RUN (program) button.
6
HOLD button.
7
FAN switch (ON, AUTO).
8
SYSTEM switch (COOL, OFF, HEAT).
The Display
9
Indicates day of the week.
10
Indicates a malfunction with the system.
5
CAUTION
!
CAUTION
!

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11
Flame icon ( ) is displayed when the SYSTEM switch is in
theHEATposition.Flameicon( )isdisplayedflashingwhen
2nd-stageheat(AuxorEmergency)isenergized.Snowflake
icon ( ) is displayed (non-flashing) when the SYSTEM
switch is in the COOL position. Snowflake and Flame icon
willbedisplayed(flashing)ifthethermostatisinlockoutmode
to prevent the compressor from cycling too quickly.
12
EMER is displayed flashing when the system switch is in
EMER position.
13
Alternately displays current time and temperature.
14
The word HOLD is displayed when the thermostat is in the
HOLD mode.
15
Displayscurrentlyprogrammedsettemperature(thisisblank
when SYSTEM switch is in the OFF position).
16
“BATT” is displayed when 2 “AAA” batteries are low and
should be replaced.
Configuration Menu
The configuration menu allows you to set certain thermostat
operatingcharacteristicstoyour systemorpersonalrequirements.
Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter the
configuration menu. The display will show the first item in the
configuration menu.
The configuration menu chart summarizes the configuration
options. An explanation of each option follows.
PressHOLDtochangetothenextmenuitemorpressTIMEto go
backwardstothepreviousiteminthemenu.Toexitthemenuand
return to the program operation, press RUN. If no keys are
pressedwithinfifteenminutes,thethermostatwillreverttonormal
operation.
1. Intherun mode,if thesetpoint temperature ismanually raised
by 3°F (2°C) or more above the actual temperature with the
TEMPERATUREUPkey,andthefastsecondstagefeatureis
enabled, FA on, the second stage will energize immediately.
With FA off, second stage will not energize until the setpoint
temperatureis1°Formoreaboveactualtemperatureformore
than ten minutes.
1
Step Press Button(s) Displayed (Factory Default) Press or to select: COMMENTS
2
ON
4
Returns to normal operation
Select Compressor lockout OFF or ON
Configuration Menu
3
0 HI
(0) 3 LO TO
3 HI Select temperature display adjustment higher or lower
PRGM
and RUN
Select Fast (on) or slow (off) Second Stage Heat
FA
(on) OFF
HOLD*
HOLD*
RUN
CL
(OFF)
* Press HOLD to advance to next item or TIME to move backwards to previous item
CHECKTHERMOSTAT OPERATION
CONTINUED FROM FOURTH PAGE
5
2. 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 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
Snowflake and Flame icons for about five minutes.
3. Select Temperature Display Adjustment 3 LO to 3 HI –
Allows you to adjust the room temperature display up to 3°
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
oradjustedroomtemperaturewillbedisplayedontheleftside
of the display.
Operating Features
Nowthatyouarefamiliarwiththethermostatbuttonsanddisplay,
readthefollowinginformation tolearnabout the manyfeatures of
the thermostat.
•SIMULTANEOUSHEATING/COOLINGPROGRAMSTOR-
AGE—Whenprogramming,youcanenterbothyourheating
and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.
•TEMPERATUREOVERRIDE—Press or untilthe
displayshowsthetemperatureyouwant.Thethermostatwill
override current programming and keep the room tempera-
tureattheselectedtemperatureuntilthenextprogramperiod
begins. Then the thermostat will automatically revert to the
program.
•HOLD TEMPERATURE — The thermostat can hold any
temperature within its range for an indefinite period, without
reverting to the programmed temperature. Press HOLD
button. HOLD will be displayed. Then choose the desired
temperature by pressing or . The thermostat will
hold the room temperature at the selected setting until you
press the RUN button to start program operation again.
•°F/°C CONVERTIBILITY — The factory default setting is
Fahrenheit. Clipping W904 jumper on the circuit board (see
fig. 1) will alter this feature to Celsius temperature setting.

1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
SAMPLE
Heating/Cooling Schedule Plan (Factory Program)
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
70 F
62 F
70 F
62 F
78 F
85 F
78 F
82 F
70 F
62 F
70 F
62 F
78 F
85 F
78 F
82 F
WEEKDAY (5 DAY) WEEKEND (2 DAY)
Start
Time Temperature Start Time Temperature
Period
COOL HEAT
WEEKDAY (5 DAY) WEEKEND (2 DAY)
Start
Time Temperature Start Time Temperature
Heating/Cooling Schedule Plan
Period
COOL
1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
COOL HEAT
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6
PROGRAMMINGYOURTHERMOSTAT
Thissection will helpyouplan your thermostat’sprogramto meet
your needs. For maximum comfort and efficiency, keep the
following guidelines in mind when planning your program.
• When heating (cooling) your building, program the tempera-
tures to be cooler (warmer) when the building is vacant or
during periods of low activity.
• During early morning hours, the need for cooling is usually
minimal.
Lookatthefactorypreprogrammedtimesandtemperaturesshown
below. If this program will suit your needs, simply press the RUN
button to begin running the factory preset program.
If you want to change the preprogrammed times and tempera-
tures, follow these steps.
Determine the time periods and temperatures for your weekday
and weekend programs. You must program four periods for both
the weekday and weekend program. However, you may use the
same heating and cooling temperatures for consecutive time
periods. You can choose start times, heating temperatures, and
coolingtemperaturesindependentlyforbothweekdayandweek-
end programs (for example, you may select 5:00 AM and 70°as
theweekday1st period heating starttimeand temperature,and
alsochoose7:00AMand76°astheweekday1stperiodcooling
start time and temperature). Use the table at the bottom of the
pagetoplanyourprogramtimeperiodsandthetemperaturesyou
wantduringeachperiod.Youmayalsowanttolookatthesample
program table to get an idea of how the thermostat can be
programmed.
Entering Your Program
Followthesestepstoentertheheatingandcoolingprogramsyou
have selected.
Set Current Time and Day
1. Press TIME button once. The display will show the hour only.
EXAMPLE:
PM
2. Press and hold either or until you reach the correct
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
3. Press TIME once. The display window will show the minutes
only.
EXAMPLE:
4. Press and hold either or until you reach the correct
minutes.
5. Press TIME once. The display will show the day of the week.
6. Press or untilyoureachthecurrentdayoftheweek.
7. Press RUN once. The display will show the correct time and
room temperature alternately.
Enter Heating Program
1. Move the SYSTEM switch to HEAT.
2. Press PRGM once. “MO TU WE TH FR” (indicating weekday
program) will appear in the display. Also displayed are the
currentlyprogrammed starttimefor the1st heating periodand
the currently programmed temperature (flashing).
EXAMPLE:
AM
MO TU WE TH FR
This display window shows that for the 1st weekday period,
thestarttimeis6:00AM,and70°istheprogrammedtempera-
ture (this example reflects factory preprogramming).
3. Press or to change the displayed temperature to
yourselectedtemperatureforthe1stheatingprogramperiod.
4. Press TIME once (the programmed time will flash). Press
or until your selected time appears. The time will
change in 15 minute increments. When your selected time is
displayed,pressTIME againto returnto the changetempera-
ture mode.
5. Press PRGM once. The currently programmed start time and
setpoint temperature for the 2nd heating program period will
appear.
6. Repeat steps 4 and 5 to select the start time and heating
temperature for the 2nd heating program period.
7. Repeatsteps 4through 6for the3rd and4th heatingprogram
periods. Weekday heating programs are now complete.
8. Press PRGM once. “SA SU” (indicating weekend program)
will appear in the display, along with the start time for the 1st
heating period and the currently programmed temperature.

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)
SPECIFICATIONS
7
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
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PROGRAMMINGYOURTHERMOSTAT
CONTINUED FROM SIXTH PAGE
6
9. Repeat steps 4 through 8 to complete weekend heating
programming.
10.When you have completed entering your heating program,
press RUN.
Enter Cooling Program
Iftheoutsidetemperatureisbelow50°F,disconnectpowerto
the cooling system before programming. Energizing the air
conditioner compressor during cold weather may cause
personal injury or property damage.
1. Move SYSTEM switch to COOL position.
2. Followtheprocedureforenteringyourheatingprogram,using
your selected cooling times and temperatures.
Check Your Programming
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
1. Move SYSTEM switch to HEAT position.
2. PressPRGMtoviewthe1stweekdayheatingperiodtimeand
temperature. Each time you press PRGM, the next heating
periodtimeand temperaturewill bedisplayed in sequencefor
weekday, then weekend program periods (you may change
any time or temperature during this procedure).
3. Press RUN.
4. Move SYSTEM switch to COOL position.
5. Repeat step 2 to check cooling temperatures.
6. Press RUN to begin program operation.
YOURTHERMOSTATISNOWCOMPLETELYPROGRAMMED
AND READY TO AUTOMATICALLY PROVIDE MAXIMUM
COMFORT AND EFFICIENCY!
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.
TROUBLESHOOTING
8
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermostat
by pressing , and TIME at the same time. This also
resetsthe factorydefaults. Ifthe thermostathas power,has been
reset and still does not function correctly contact your heating/
cooling service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh “AAA” Energizer®alkaline batteries.

Symptom Possible Cause Corrective Action
No Heat (continued) 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.
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.
Thermostat Does Not Follow Program 1. AM or PM set incorrectly in program. Check current clock and program settings
2. AM or PM set incorrectly on the clock. including the AM or PM designations for each
3. Voltage spike or static discharge. time period. If a voltage spike or a static discharge
occurs use the Reset Operation listed above.
Blank Display and/or Keypad 1. Voltage spike or static discharge. Use the Reset Operation listed above.
Not Responding
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TROUBLESHOOTING
CONTINUED FROM SEVENTH PAGE
8