Orbit 83521 User manual

Clear Comfort®Pro
7-day Programmable
Thermostat
User Guide
Model 83521
IMPORTANT Make sure to label your wires with
the included wire labels before removing your old
thermostat (see page 8).
We also recommend taking a picture of the current
wiring before disconnecting.

i 1
TABLEOFCONTENTS
Thank you for purchasing the Clear Comfort® Pro thermostat from Orbit®.
We are excited to provide you a long-lasting thermostat that blends style with function.
Features
• Easily program 7 individual days or copy one programmed day to another
• Pre-programmed and ready to go with Energy Star®seings
• Large backlit display is easy to read
• Early start ensures the desired temperature is reached at the scheduled time
• Precision control keeps the temperature within 1°F of set level
• Override the schedule temporarily or permanently
Quick Reference
Easy 1-2-3 Operation ..................................................................... 2
Thermostat Controls .................................................................... 3
Display Screen.................................................................................4
Before You Begin............................................................................ 5
Installation
Installing Your Thermostat.......................................................... 7
Temperature Format....................................................................17
Reset Buon....................................................................................17
Advanced System Setup ............................................................18
Operation
Set Time and Day .........................................................................22
Select Mode and Fan Seings................................................23
Programmed Schedules.............................................................24
Energy Star®Programmed Schedule ....................................25
Modifying the Programmed Schedule.................................26
Using the Copy Feature............................................................. 27
Overriding Schedules Temporarily........................................28
Overriding Schedules Permanently......................................29
Turning Off Schedules .............................................................. 30
Compressor Protection..............................................................31
Early Start........................................................................................32
Appendices
Replacing the Baeries..............................................................33
Troubleshooting ............................................................................34
Customer Assistance.................................................................40
Warranty ...........................................................................................41

2 3
MODE Switch:
Select between
Heat/Off/Cool
p/qBuons: Press to
adjust temperature or use to
navigate during set up
HOLD: Press to override
programmed schedule
RUN:Press to resume
programmed schedule
FAN Switch:
Select between
Auto Fan/Fan On
SET:Press to set
schedule, time, and day
Backlit Screen:
Press any buon to activate
1. Set the time and day ........................................................................................................................See page 20
2. Select whether to heat or cool .................................................................................................... See page 21
3. Select fan seing ............................................................................................................................... See page 21
Your thermostat is now ready to use, simply press RUN. If you do not wish to use
the preprogrammed Energy Star®thermostat seings you can:
Modify the programmed schedule...................................................................................................See page 24
Temporarily override the programmed schedule.......................................................................See page 26
Permanently override the programmed schedule ..................................................................... See page 27
EASYOPERATION THERMOSTATCONTROLS

4 5
Heating system is on
Fan seing
Fan is activated
Room temperature
Reminder to
change baeries
Desired
temperature
seing
Schedule period
Current day of the week
Current time
Indicate which
mode the
system is in
Cooling system is on This thermostat is compatible with
the following systems:
• Gas, oil or electric furnace
• Central air conditioner
• 2 wire hot water system with or without pump
• Millivolt system
• Central heating and cooling system
• Heat pump without auxiliary/backup heat
Tools Required For Installation
• Phillips screwdriver
• Wire cuers/strippers
• Drill with 3/16" (4.8 mm) drill bit
• Level
BEFOREYOUBEGINDISPLAYSCREEN
This thermostat is not compatible with
base board heaters (or other line voltage
heating), multi-stage heating or cooling
systems, or 3-wire hydronic systems.

6 7
Take a picture or make note of
the current wiring for reference.
Mercury Notice: If your old thermostat
contains mercury contact your local waste
management authority for information on
how to safely dispose of it.
When replacing an existing thermostat,
position your new Clear Comfort® Pro
thermostat in the same location as your
old one, unless the conditions that follow
suggest otherwise. For a new installation,
follow these guidelines for placement:
• Place the thermostat in a room or hallway that
is used oen; position on an inside wall about 5'
(1.52 m) from the floor.
• Avoid installing the thermostat in overly warm
areas (e.g., near a television, lamp, radiator, or
fireplace), in direct sunlight, or
on a wall that has hot water pipes or that is
opposite a stove.
Switch Off Power
Turn off the power to the heating
and cooling equipment.
Remove Cover
Remove the front cover from the
old thermostat.
TIPSFORINSTALLATION INSTALLINGYOURTHERMOSTAT
• Avoid installing the thermostat in
overly chilled areas, such as in a dray area (e.g.,
stairwell, door, or window),
on a wall separating an unheated room,
or where air circulation is poor
(e.g., in a corner or behind a door).
• Avoid installing the thermostat in damp areas, as
this can lead to corrosion.
• Do not install the thermostat until construction
work is complete, the area is dust free, and
painting is completed.
• If the thermostat housing is cold, wait for it to
reach room temperature before installing.
Y W
G0/B Y W RC R
GR

8 9
INSTALLINGYOURTHERMOSTATINSTALLINGYOURTHERMOSTAT
Mount New Base
a. Remove the thermostat body from
the base by gently pulling them apart.
b. Place the base flat against the wall by
feeding the wires through the opening
below the wiring terminal.
c. Level the base and mark the holes for
the mounting screws with a pencil.
d. Remove the base and drill holes at
marked positions. Insert the provided
wall anchors.
e. Feed wires back through the opening
and aach the base to the wall with
the screws provided.
Label Wires
Use the supplied wire labels to identify the
wire by its terminal leer and not the color.
Once the wires are labeled, disconnect the
wires and remove the base.
While labeling and removing the
individual wires DO NOT let the wire
fall back inside the wall.
B B
G G
R R
V/VR V/VR
X X
Y Y
H H
RC RC
W W
X X
C C
L L
RH RH
W
X X
W
E E
O O
T T
W
Y Y
W
F F
P P
U U
W
Y Y
W
AUX
AUX
G O/B Y W RC R
Y W
G0/B Y W RC R
GR

10 11
CAUTION: Stripping too much insulation from the end of a wire creates the
potential for shorting between wires and could prevent proper function of the thermostat.
INSTALLINGYOURTHERMOSTATINSTALLINGYOURTHERMOSTAT
Wire Installation for Heat Pump Systems
a. Loosen the screws on each terminal.
b. Insert jumper wire into the Y and W
terminals.
c. Insert each labeled wire into the matching
terminal and tighten the screws.
d. Wrap exposed areas of any unused wire
with electrical tape.
Wire Installation
for Conventional Systems
a. Loosen the screws on each terminal.
Note: Remove jumper wire if you have both
R and RC wires.
b. Insert each labeled wire into the matching
terminal and tighten the screws.
c. Wrap exposed areas of any unused wire
with electrical tape.
d. Continue to page 12.
R
O
G
W
R
W
Y
O
G
screw screw
labeled
wire
labeled
wire
/"
9.5 mm
Note: Expose 3/8" of each wire for proper installation.
RR RCRC WW YY GG O/BO/B
jump wire jump wire

12 13
INSTALLINGYOURTHERMOSTATINSTALLINGYOURTHERMOSTAT
Less Common Heat Pump Systems
Wire Installation for Less Common
Conventional Systems
R
Rh

V
Rc
R
W
W1
H
Y
M
Y1
G
F
C
C1
B
X
Y2
W2
TAPE
R
VR
V
Rc
R
Y
M
Y1
O
B
H
G
F
C
X
B
Aux
W
W1
W2
TAPE
L
F
E
X
RR RC RC WW YY GG O/B O/B
Note: Most systems can be wired using the
wiring diagrams and instructions on pages 10
& 11. If your thermostat wiring does not match
those wiring configurations, use the diagrams
and instructions on pages 12 & 13.
Note: Most systems can be wired using the
wiring diagrams and instructions on pages 10
& 11. If your thermostat wiring does not match
those wiring configurations, use the diagrams
and instructions on pages 12 & 13.
If Y2 or W2 wires are
present, the Orbit
thermostat is not
compatible with your
system.
If your existing thermostat
has V1, W1, and W2 wires,
stop now and contact a
qualified HVAC technician
for assistance.
If your existing thermostat
has L, F, E, or Aux wires,
the Orbit thermostat is
not compatible with your
system.
Remove metal jumper
connecting R & Rc terminals
only if your system requires
both R & Rc wires.
Leave the metal jumper
in place, connecting the
R & Rc terminals.
If your existing thermostat has
both V and VR wires, stop now
and contact a qualified HVAC
technician for assistance.
If your existing thermostat has
a separate O and B wire, stop
now and contact a qualified
HVAC technician for assistance.
If your existing thermostat has
both R & Rh wires, remove
metal jumper between the R
& Rc terminals. Connect the R
wire to the Rc terminal and the
Rh wire to the R terminal.
Wrap all C, C1 B or X
wires with electrical tape.
Do not connect them.
If your existing thermostat
has a C wire, it should be
wrapped with electrical
tape and not connected to
your new thermostat.

14 15
Electric
Heat
Gas/Oil
Heat
Heat Heat
(B) (O)
INSTALLINGYOURTHERMOSTAT
Electric
Heat
Gas/Oil
Heat
Heat Heat
(B) (O)
Set Fan Control Jumper
Correct placement of this J2 jumper
optimizes energy use and comfort levels
for the connected system type.
INSTALLINGYOURTHERMOSTAT
O B
Electric
Heat
Gas/Oil
Cool
Heat Cool
(B) (O)
Electric
Heat
Gas/Oil
Cool
Heat Cool
(B) (O)
Set Heat Pump Jumper
The following instructions are necessary
to check the J3 jumper placement if you
have a heat pump system.
OLeave the jumper in the Cool (O)
factory-set position if you connected an
O wire to the O/B terminal.
BMove the jumper to the Heat (B)
position if you connected a B wire to the
O/B terminal.
Gas/Oil Heat
For gas or oil systems leave the jumper in the
Gas/Oil Heat factory-set position.
Electric Heat
For electric and heat pump systems move
the jumper to the Electric Heat position.

16 17
INSTALLINGYOURTHERMOSTAT
G O/B Y W RC R
MODE
FAN
SET RUN HOLD
Completing an installation
a. Insert three Energizer® or Duracell® AAA
alkaline baeries.
b. Install the thermostat body by gently
pushing it onto the base until it “clicks” into
place. Verify that there are no gaps in the
side housing.
c. Turn the power back on to the heating and
cooling equipment.
RESETBUTTONTEMPERATUREFORMAT
Switching Between
Fahrenheit (°F) and Celsius (°C)
1. Slide the MODE switch to the
off position.
2. While holding ppress SET.
3. Release both buons.
4. Repeat steps 2 and 3 to toggle
between °F and °C.
RESET
THERMOSTATFIGMINIMUMOFFTIMEMU
Off
Arrow down
Arrow up
To access the RESET buon, remove the
thermostat body from its base by gently
pulling them apart.
• Press and hold for five seconds to reset all
system seings and temperature gauges back to
factory defaults.
Note: Be careful not to
touch the black surface
on which the reset button
is mounted, and do not
clean it if dusty.

18 19
The following four features are done in a
flow-through setup. The system will walk you
through each feature. To access only one
feature, follow these steps then press SET
until you come to the feature you would like
to adjust.
1. Slide the MODE switch to the off
position.
2. While holding the RESET buon press
SET, “offset” will appear on the display.
Note: Do not hold the reset button for more
than five seconds.
3. Release both buons.
Note: The system will automatically exit if no
buon is pressed within 12 seconds.
Offset the temperature display to read +/- 9°
F (+/- 4.5° C). This thermostat has a highly
accurate temperature sensor; if you desire
to match the display with other devices this
offset feature can be used.
Note: Using this feature does not change the actual
temperature.
1. Press por qto change the offset
amount.
2. Press SET to advance to the next step.
To exit, press SET four times.
TEMPERATUREOFFSETADVANCEDSYSTEMSETUP EARLYSTART SYSTEMTYPE
Your thermostat comes preprogrammed
with early start functionality turned off. This
function allows the heating or cooling system
to turn on before the programmed start time
so that the room temperature matches the
set temperature at the start time.
1. Press por qto toggle between OFF
and ON.
2. Press SET to advance to the next step.
To exit, press SET three times.
Your thermostat is set at the factory to
operate a standard fossil fuel furnace
heating system.
1. Press por qto toggle between the
heat systems being used.
• If using a Heat Pump select HP.
• If using a Furnace select F.
2. Press SET to advance to the next step.
To exit, press SET two times.

20 21
MINIMUMCYCLEPERIOD
Changing the minimum cycle period to six
minutes or greater enables smart logic.
Your thermostat will learn, over time, the
best cycle times for your system and home
conditions. Using smart logic can optimize
energy use and comfort level, and allow for
seing the thermostat to turn on the system
more or less frequently.
1. Press por qto select the desired
cycle period.
2. Press SET to accept the cycle period
and exit.
• If Heat Pump (HP) has been selected,
it will toggle between 60, 30, 20, 15,
12 and 0.
• If Furnace (F) has been selected, it will
toggle between 60, 30, 20, 15, 12, 10, 8,
6 and 0. 1-Stage heat pump 20
Compressor 20
1-Stage gas furnace heat with electric fan 12
1-Stage gas furnace heat with gas fan 12
1-Stage oil furnace 12
Steam and gravity 60
Hot water system 20
High efficiency furnace 20
Electric furnace 6
System Type Cycle Period
(Minutes)
F
HP
MINIMUMCYCLEPERIOD
Common Cycle Period Seings

22 23
SETTIMEANDDAY
Set the time and day
1. With the thermostat in off mode, press SET.
2. Press por qto adjust the time.
3. Press SET to accept the time and continue.
Note: Press and hold por qto advance
the time faster.
MODE
4. Press por qto select the day of the
week.
5. Press SET to accept the day of the
week and exit.
SELECTMODEANDFANSETTINGS
Slide the mode switch to whether you
want to heat or cool to achieve the set
temperature.
• heat—System will activate heating to reach the
set temperature.
• off—Systems are off.
• cool—System will activate cooling to reach the
set temperature.
Slide the fan switch to the appropriate
seing to operate fan.
• auto fan—Fan will run automatically when
heating or cooling is activated.
• fan on—Fan will run continuously. Note: Auto fan is the most commonly used seing.
heat
off
cool
auto fan
fan on

24 25
wake Set it to the time you wake up and the temperature you want
it to be at that time.
leave Set it to the time you leave the house and the temperature
you want while you are out.
return Set it to the time you return home and the temperature you
want it to be when you arrive.
sleep Set it to the time you go to sleep and the temperature you
want it while you are sleeping.
PROGRAMMEDSCHEDULES
The thermostat schedule is divided into four periods
for you to program for maximum energy savings.
ENERGYSTAR®PROGRAMMEDSCHEDULE
For optimal energy savings your thermostat is preprogrammed with the following schedule for
each day of the week. Simply switch your thermostat to the heat or cold mode and press RUN.
Period Start Time Heat Cool
wake 6:00 am 70°F 78°F
leave 8:00 am 62°F 85°F
return 6:00 pm 70°F 78°F
sleep 10:00 pm 62°F 82°F

26 27
1. Switch the thermostat to the MODE
you want to program (heat or cool) and
press SET.
2. Press por qto scroll between days
and press SET when the day you would
like to schedule is flashing.
3. Press por qto set your wake start
time and press SET to accept the time.
MODIFYINGTHEPROGRAMMEDSCHEDULE
4. Press por qto set the wake
temperature and press SET to accept the
temperature and proceed.
5. Follow steps 3 and 4 to set
the time and temperature for
the remaining periods.
6. Continue to set up each day individually
or use the copy feature to copy one day
to another (see page 25) or press RUN to
save and exit.
From the days of the week menu you can
copy a schedule from a single day to one or
more days. To access that menu, if you are not
already there, switch the thermostat to the
MODE you want to program (heat or cool)
and press SET.
1. Press por qto scroll to copy and press
SET when the word “copy” is flashing.
“Copy from” will appear on the display.
USINGTHECOPYFEATURE
2. Press por qto select the day you would
like to copy and press SET when that day
is flashing.
3. Press por qto select the day you
would like to copy to. You can select an
individual day or select all to have your
schedule copied to every day of the
week.
4. Press SET to advance to the next step or
RUN to save and exit.
“Copy to” will appear on the display.

28 29
Press por qto raise or lower the
temperature. This temporary adjustment
will remain until the start time of the next
period. The word “temporary” will be
displayed leing you know the temperature
has been adjusted.
Note: Pressing the por q button once will
turn on the backlight. To change the setpoint
temperature press either button more than once.
OVERRIDINGSCHEDULESTEMPORARILY
You can remove the temporary seing at any
time by pressing RUN, the system will return
to your previous programmed schedule.
“Temporary” will appear on the display.
OVERRIDINGSCHEDULESPERMANENTLY
Press HOLD to override the programmed
schedule. All programmed temperature
changes for all periods will be ignored.
While the system is in hold you can manually
change the temperature at any given time
by pressing por q. The thermostat will
maintain this temperature change until you
manually change it again or remove the hold.
You can remove the hold at any time by
pressing RUN, the system will return to your
previous programmed schedule.
“Hold.” will appear on the display.

30 31
Press HOLD for five seconds until the
manual indicator “man.” appears on the
screen.
Your thermostat now functions as a non-
programmable device with no scheduled
program. SET, RUN, and HOLD will not work
while in this seing. If it is too hot or too
cold, you will have to manually change the
temperature. Press por qto raise or lower
the temperature.
You can exit the manual seing at any time by
pressing RUN for five seconds, the system will
return to your previous programmed schedule.
TURNINGOFFSCHEDULES
“Man.” will appear on the display.
BUILTINCOMPRESSORPROTECTION
This function helps protect against damage
to the compressor in your air conditioning
or heat pump system. The compressor is
forced to wait five minutes aer turning off
before it can turn on again. The appropriate
MODE indicator icon will flash on the display
whenever this feature is running.
/ flashes while minimum off time
is being enforced.

32 33
EARLYSTARTFUNCTIONALITY THERMOSTATCARE
This function allows the heating or cooling system
to turn on before the programmed start time
so that the room temperature matches the set
temperature at the start time.
Example: Your Wake time is set for 6:30 am with a
temperature of 72°. Your system will turn on before 6:30
am, so the temperature is 72° when you wake up.
Note: To turn on this function see page 17.
To prevent damage to the clear lens over the
thermostat face, use a so coon cloth and
clean with mild soap and water only.
DO NOT use paper towels or other abrasive
cloths. DO NOT spray any liquid directly
onto the thermostat.
It is recommended that the baeries
in the thermostat be replaced once
a year or before leaving the home for
a prolonged period of time.
1. Switch the system MODE to off before
changing the baeries.
2. Remove the thermostat body from its
base by gently pulling them apart.
3. Turn the thermostat over and remove
old baeries.
4. Replace them with fresh Energizer®
or Duracell®alkaline AAA baeries,
carefully observing the required
polarities.
5. Reinstall the thermostat body onto its
base by gently pushing it until it “clicks”
into place.
Note: If the batteries are not changed within 7
days after the Low Battery Indicator appears
on the display, the set temperature will
increase by 10°F in cool mode, or decrease by
10°F in heat mode as a further reminder. After
90 days, or less, depending on the condition of
the batteries, the system will turn off and the
Low Battery Indicator will flash on the display.
WARNING: Failure to change
batteries in a timely fashion can lead
to uncontrolled heating and cooling.
REPLACINGTHEBATTERIES

34 35
Problem:
No heating/cooling system activation
Solution:
1. Verify MODE switch is in proper heat or cool mode.
2. Check baeries. Replace if necessary. (See “Replacing the Baeries,” page 31).
3. Check set temperature. Set temperature should read above room temperature in heat
mode and below room temperature in cool mode.
4. Verify Heating/Cooling power switch isn’t off.
5. Verify that the circuit breaker isn’t tripped.
6. Verify that the furnace door is closed securely.
7. Check for loose or crossed wiring in the thermostat wiring terminal.
8. Verify that copper wires are not exposed and touching other wires.
9. Verify that the O/B jumper is installed appropriately. (See “Set Heat Pump Jumper” page
12).
10. Verify that the FAN jumper is installed appropriately.
(See “Set Fan Control Jumper” page 13).
TROUBLESHOOTING
Problem:
No fan/fan runs continuously
Solution:
1. If the fan runs continuously, verify that the thermostat is in the AUTO position not the ON
position.
2. Let the thermostat sit (do not touch) for 30 minutes to allow the temperature to stabilize.
3. Verify that the G wire in the thermostat wiring terminal is connected properly.
4. Verify Heating/Cooling power switch isn’t off.
5. Verify that the circuit breaker isn’t tripped.
6. Verify that the furnace door is closed securely.
7. Check for loose or crossed wiring in the thermostat wiring terminal.
8. Verify that copper wires are not exposed and touching other wires.
9. Verify that the fan jumper is installed appropriately. (See “set fan control jumper” page 13).
TROUBLESHOOTING

36 37
Problem:
Incorrect room temperature
Solution:
1. Let the thermostat sit (do not touch) for 30 minutes to allow the temperature to stabilize.
2. Check placement of thermostat; make sure it’s not in an unusually dray or heated area.
3. Verify that the wall hole for wires is insulated properly.
4. Check Temperature Offset (see “Temperature Offset,” page 16).
Problem: Buons below display do not function
Solution: Verify that the thermostat is not in MANUAL mode
(see “Turning Off Schedules,” page 28).
TROUBLESHOOTING
Problem: Not reaching set temperature
Solution:
1. Verify that the MODE switch is in proper heat or cool mode.
2. Verify that Heating/Cooling systems are working properly.
(See “No heating/cooling system activation,” page 32.)
3. Check for loose or crossed wiring in the thermostat wiring terminal.
4. Check Temperature Offset (see “Temperature Offset,” page 16).
5. Check placement of thermostat; make sure it’s not in an unusually dray or heated area.
6. Verify that the wall hole for wires is insulated properly.
7. Verify that the O/B jumper is installed appropriately. (See “Set Heat Pump Jumper” page
12).
Problem: Wrong temperature scale displayed
Solution: See “Temperature Format,” page 15.
TROUBLESHOOTING