Page 1
CONTENTS
Installation Instructions for
Heating & Air Conditioning
1F78H
5/2 Day Programmable Thermostat
Y OUR THERMOST A T REPLACES
Typical System Compatibility Chart 1F78H
Standard Heat Only Gas or Oil Fired Systems (24 volt)* Yes
Electronic Ignition Heat Only Two Wire Systems (24 volt)* Yes
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)* Yes
Standard Heat/Cool Systems (24 volt)* Yes
Heat/Cool Systems Electric Heat (24 volt)* Yes
Heat Only Electric Heat Systems (24 volt)* Yes
Cool Only Systems (24 volt)* Yes
Heat Pump Systems (No Aux or Emergency Heat)* Yes
Hot Water Zone Heat Only Systems No
Hot Water Zone Heat Only (Three Wire) Systems No
Line Voltage Heating or Baseboard 110/240 Volt Systems No
Millivolt Systems Floor or Wall Furnaces No
12 VDC Mobile Home Application No
Multistage Systems No
Systems Exceeding 30VAC, 1.5 Amp No
* Requires common wire for 24VAC at the thermostat
Preparations.................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat ............................ 1
Mounting and Wiring ..................................... 2
Check Thermostat Operation ........................ 3
Configuration Menu....................................... 4
Programming your Thermostat ..................... 5
Specifications ................................................ 7
Troubleshooting ............................................ 8
PREPARATIONS
1
Assemble tools required as shown below.
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
WIRE CUTTER/STRIPPER
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage
THERMOSTAT DETAILS
2
Mounting
hole
W905
Clip for
Hydronic
System
W904
W905
W904
Clip for
Celsius Display
Figure 1. Thermostat base
W
RH
GC
GAS
ELEC
Electric/Gas
Switch
Mounting
hole
BRC
Y
O
3
REMOVING OLD THERMOSTAT
CAUTION
!
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.
Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed from.
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. 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.
2. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
3. Remove the front cover of the old thermostat. With wires still
attached, remove wall plate from the wall. If the old thermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.
4. Identify each wire attached to the old thermostat.
5. Disconnect the wires from the old thermostat one at a time.
DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
PART NO. 37-6448A
Printed in U.S.A.
0247
Page 2
REMOVING OLD THERMOSTAT
3
CONTINUED FROM FIRST PAGE
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. 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 2892 Harrison Street,
Batesville, AR 72501-2117 for proper disposal.
MOUNTING AND WIRING
4
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 system shall conform to Class II circuits per the NEC code.
Electric Heat or Single-Stage
Heat Pump Systems
This thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.), forced air system. It is configured
correctly for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric
or heat-pump system that REQUIRES the thermostat to turn on
the fan on a call for heat, locate the GAS/ELECTRIC switch (see
fig. 1) and switch it to the ELECTRIC position. This will allow the
thermostat to energize the fan immediately on a call for heat. If you
are unsure if the heating/cooling system requires the thermostat
to control the fan, contact a qualified heating and air conditioning
service person.
Hydronic (Hot Water or Steam)
Heating Systems
This thermostat is set to operate properly with a forced-air heating
system. If you have a hydronic heating system (a system that
heats with hot water or steam), you must set the thermostat to
operate properly with your system by changing the first option in
the configuration menu to SL (see Configuration Menu, page 5).
CAUTION
!
Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
RH
RC
G
W
Y
C
* Factory installed jumper wire between the RH
and RC terminals must remain in place.
Other Manufacturers’
Terminal Designation
4
RH
R
R
G
G
W
W
Y
Y
C
C
*
M
R
V
-
F
G
H
W
C
Y
X
C
Attach 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. If necessary, move
the electric heat switch (see ELECTRIC HEAT SYSTEMS,
above).
2. Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 7).
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 fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
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Page 3
MOUNTING AND WIRING
4
CONTINUED FROM SECOND PAGE
Y
Y
Cooling
System
NOTE
Y
Cooling
System
G W
Fan
Relay
G W
Fan
Relay
G W
Fan
Relay
OBC
NOTE
For Heat only,
attach to RH and W
Figure 2. Typical wiring diagram for
heat only, 4-wire, single transformer systems
Figure 3. Typical wiring diagram for
cool only, 4-wire, single transformer systems
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
OBC
Figure 4. Typical wiring diagram for
heat/cool, 5-wire, single transformer systems
Heating
System
Heating
System
RCOBC
RC
JUMPER
WIRE
24 VAC
JUMPER
WIRE
RH
24 VAC
TRANSFORMER
THERMOSTAT
RH
TRANSFORMER
JUMPER
WIRE
RH
RC
24 VAC
TRANSFORMER
THERMOSTAT
SYSTEM
120 VAC
SYSTEM
Hot
120 VAC
Neutral
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
Hot
Neutral
OBC
Y
Cooling
System
G W
Fan
Relay
Heating
System
THERMOSTAT
RH
RC
SYSTEM
24 VAC
HEATING
TRANSFORMER
24 VAC
COOLING TRANSFORMER
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
Figure 5. Typical wiring diagram for
heat/cool, 6-wire, two-transformer systems
G W
Fan
JUMPER
WIRE
RCOBC
24 VAC
THERMOSTAT
RH
SYSTEM
TRANSFORMER
Hot
120 VAC
Neutral
JUMPER
WIRE
Y
Reversing
Compressor
Valve*
Contactor
* Reversing valve is energized when the
system switch is in the COOL position
Relay
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
G W
Fan
JUMPER
WIRE
RCOBC
24 VAC
THERMOSTAT
RH
SYSTEM
TRANSFORMER
Hot
120 VAC
Neutral
JUMPER
WIRE
Y
Reversing
* Reversing valve is energized when the
system switch is in the HEAT position
Valve*
Compressor
Contactor
Relay
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
CHECK THERMOST A T OPERA TION
5
NOTE
To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.
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 G terminal 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.
Cooling System
CAUTION
!
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system.
This thermostat has a time delay between cooling cycles to allow
the head pressure in the compressor to stabilize. If the temperature is adjusted to call for cool within 5 minutes of the last cycle the
snowflake icon will blink indicating the thermostat is locked out.
After 3 to 5 minutes, the compressor will start and the snowflake
icon will stop flashing. This helps prevent the compressor from
cycling too quickly and is normal operation for the thermostat.
1. Move SYSTEM switch to COOL position.
2. Press
to adjust thermostat setting below room temperature. The blower should come on immediately on high speed,
followed by cold air circulation
3. Press to adjust temperature setting above room temperature. The cooling system should stop operating.
Heating System
1. Move SYSTEM switch to HEAT position. If the heating system
has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting above room temperature. The heating system should begin to operate.
3. Press to adjust temperature setting below room temperature. The heating system should stop operating.
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Page 4
CHECK THERMOST A T OPERA TION
5
CONTINUED FROM THIRD PAGE
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, 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.
(Down arrow) Lowers temperature setting.
2
3
TIME button.
PRGM (program) button.
4
5
RUN (program) button.
6
HOLD button.
7
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
8
THE DISPLAY
11
WHITE-RODGERS
TIME PRGM RUN HOLD
1
2
FAN SYSTEM
OFFON AUTO COOL HEAT
76543
8
9
12
Indicates day of the week.
9
is displayed when the SYSTEM switch is in the HEAT
10
position. is displayed (non-flashing) when the SYSTEM
switch is in the COOL position.
when the compressor is in lockout mode.
Alternately displays current time and temperature.
11
Displays currently programmed set temperature (this is blank
12
when SYSTEM switch is in the OFF position).
13
The word HOLD is displayed when the thermostat is in the
HOLD mode.
is displayed (flashing)
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
the thermostat.
• SIMULTANEOUS HEATING/COOLING PROGRAM STOR-
AGE—When programming, you can enter both your heating
and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.
• TEMPERATURE OVERRIDE—Press or until the
display shows the temperature you want. The thermostat will
override current programming and keep the room temperature at the selected temperature until the next program period
begins. Then the thermostat will automatically revert to the
program.
• HOLD TEMPERATURE—The thermostat can hold any tem-
perature within its range for an indefinate period, without
reverting to the programmed temperature. Press HOLD
13
Figure 8. Thermostat display, buttons, and switches
button. HOLD will be displayed. Then choose the desired
hold temperature by pressing
will hold the room temperature at the selected setting until
you press RUN button to start program operation again.
CONFIGURATION MENU
6
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal requirements.
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 table summarizes the configuration options. An explanation of each option follows.
Press HOLD to change to the next menu item or press TIME to go
backwards to the previous item in the menu. To exit the menu and
return to the program operation, press RUN. If no keys are
pressed within fifteen minutes, the thermostat will revert to normal
operation.
or . The thermostat
10
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Page 5
Configuration Menu
PM
Step
* Press
Press Button(s)
1
PRGM and RUN
2
3
4
5
6
7
HOLD*
HOLD*
HOLD*
HOLD*
HOLD*
RUN
HOLD to advance to next item or TIME to move backwards to previous item
Displayed (Factory Default)
(FA)
d-L (ON)
E (ON)
LOC (OFF)
0 HI (0)
(F)
Press or to select:
1) Select FA or SL (Fast or Slow) Heating Cycle Rate—The
FA setting is frequently used for gas, oil or electric heat. The
SL setting produces a longer heating cycle which is normally
for hot water or steam (hydronic) systems. Both settings
produce very accurate temperature control and can be set to
your personal preference. FA cycles the system just under
1°F and the SL setting cycles at approximately 1.5F°.
2) Not Available
3) Select Energy Management Recovery OFF or ON—
Energy Management Recovery (EMR) causes the thermostat to start heating or cooling early to make the building
temperature reach the program setpoint at the time you
specify. Heating will start 5 minutes early for every 1° of
temperature required to reach setpoint.
Example: You select EMR and have your heating programmed to 65° at night and 70° at 7 AM. If the building
temperature is 65° the difference between 65° and 70° is 5°.
Allowing 5 minutes per degree the thermostat setpoint will
change to 70° at 6:35 AM. Cooling allows more time per
degree because it takes longer to reach temperature.
4) Select Compressor Lockout LOC OFF or ON—Selecting
LOC 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 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 feature is already
present in their system. When the compressor time delay
occurs it will flash the
for about five minutes then turn on
the compressor.
5) Select Temperature Display Adjustment 4 LO to 4 HI—
Allows you to adjust the room temperature display 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.
6) Select F° or C° Readout—Changes the display readout to
Centigrade or Fahrenheit as required.
Comments
SL
OFF
OFF
ON
4 LO to 4 HI
C
7
PROGRAMMING Y OUR THERMOST A T
Select FA or SL (Fast or Slow) heating cycle rate
N/A
Select Energy Management Recovery OFF or ON
Select compressor lockout OFF or ON
Select temperature display adjustment higher or lower
Select temperature display to F or C
Returns to normal operation
This section will help you plan your thermostat’s program to 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 temperatures 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.
Look at the factory preprogrammed times and temperatures shown
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 temperatures, 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 cooling temperatures independently for both weekday and weekend programs
(for example, you may select 5:00 AM and 70° as the weekday 1st
period heating start time and temperature, and also choose 7:00
AM and 76° as the weekday 1st period cooling start time and
temperature). Use the table at the bottom of the page to plan your
program time periods and the temperatures you want during each
period. You may also want to look at the sample program table to
get an idea of how the thermostat can be programmed.
Entering Your Program
Follow these steps to enter the heating and cooling programs you
have selected.
Set Current Time and Day
1. Press TIME button once. The display will show the hour only.
EXAMPLE:
2. Press and hold either or until you reach the correct
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
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.
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Page 6
PROGRAMMING Y OUR THERMOST A T
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
7
CONTINUED FROM FIFTH PAGE
6. Press or until you reach the current day of the week.
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
currently programmed start time for the 1st heating period and
the currently programmed temperature (flashing).
MO TU WE TH FR
EXAMPLE:
This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 70° is the programmed temperature (this example reflects factory preprogramming).
3. Press
or to change the displayed temperature to
your selected temperature for the 1st heating program period.
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, press TIME again to return to the change temperature 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. Repeat steps 4 through 6 for the 3rd and 4th heating program
periods. Weekday heating programs are now complete.
AM
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.
9. Repeat steps 4 through 8 to complete weekend heating
programming.
10. When you have completed entering your heating program,
press RUN.
Enter Cooling Temperatures
If the outside temperature is below 50° F, disconnect power
to the cooling system before programming. Energizing the
air conditioner compressor during cold weather may cause
personal injury or property damage.
1. Move SYSTEM switch to COOL position.
2. Follow the procedure for entering your heating program, using
your selected cooling times and temperature.
Check your programming
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
1. Move the SYSTEM switch to HEAT position.
2. Press PRGM to view the 1st weekday heating period time and
temperature. Each time you press PRGM, the next heating
period time and temperature will be displayed in sequence for
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 beging program operation.
YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED
AND READY TO AUTOMATICALLY PROVIDE MAXIMUM
COMFORT AND EFFICIENCY!
Heating/Cooling Schedule Plan (Factory Program)
WEEKDAY (5 DAY)
Period
1ST
2ND
3RD
4TH
1ST
2ND
3RD
COOL HEAT
4TH
Start
Time Temperature
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
SAMPLE
WEEKEND (2 DAY)
Start
Time Temperature
70 F
62 F
70 F
62 F
78 F
85 F
78 F
82 F
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
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SPECIFICATIONS
8
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz.
0.05 to 1.2 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
TROUBLESHOOTING
9
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
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
resets the factory defaults. If the thermostat has power, has been
reset and still does not function correctly contact your heating/
cooling service person or place of purchase.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker. 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 temp above
room temp.
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.
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 thermostat is operating properly . If the thermostat does
not click, try the reset operation listed above. If the
thermostat does not click after being reset contact
your heating and cooling service person or place
of purchase for a replacement. If the thermostat
clicks, contact the furnace manufacturer or a
service person to verify the heating is operating
correctly.
No Cool 1. System Switch not set to Cool. Set System Switch to Cool and lower temp below
room temp.
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.
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Page 8
TROUBLESHOOTING
9
CONTINUED FROM SEVENTH PAGE
Symptom Possible Cause Corrective Action
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 below. 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, change the cycle rate to
“SL” in the configuration menu. It is not possible to
shorten the cycle time. If an acceptable cycle rate
is not achieved as received or by changing the
cycle rate. 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
cycle rate. suggestions.
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 4 degrees.
Thermometer Disagree adjustment. See Temperature Display Adjustment in the
Configuration menu.
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. If a voltage spike occurs use the Reset Operation
Not Responding listed above.
Clock Loses or Gains Time 1. Loss of power to thermostat. The thermostat will maintain its program in
memory even with no power but the clock time
will be incorrect when power is restored.
See No Heat/No Cool/No Fan (commonproblems)
above for items to check in the system.
Heat or Cool Starts Early 1.EMR activated. See Configuration Menu (Item 4).
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