Honeywell CT2095 User manual

Place Bar Code Here
69- 1385
OWNER’S GUIDE
Honeywell/20
Programmable Thermostat
Weekday/Weekend (5-day/2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model CT2095

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Welcome to the world of comfort and energy
savings with your new Honeywell
Programmable Thermostat.
Your new thermostat will automatically control
the temperature in your home, keeping you
comfortable while saving energy when
programmed according to the instructions in
this manual.
Direct any questions concerning the application
of this thermostat to Honeywell Consumer
Services at 1-800-468-1502, Monday-Friday,
7:00 a.m.-5:30 p.m., Central time.
MERCURY NOTICE
If this thermostat is replacing a thermo-
stat that contains mercury in a sealed
tube, do not place your old thermostat in
the trash. Dispose of properly.
Contact your local waste management
authority for instructions regarding recy-
cling and the proper disposal of your old
thermostat. If you have questions, call
Honeywell Customer Response Center
at 1-800-
468-1502.
Typical location of
a mercury switch
in a thermostat.
M3701
MERCURY
SWITCH

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Contents
Step 1. Prepare for Installation ..................................................................................................... 4
Step 2. Remove Old Thermostat ..................................................................................................6
Step 3. Install Batteries ................................................................................................................ 8
Step 4. Program Thermostat ........................................................................................................ 11
Step 5. Adjust Fan Operation Switch, As Required ...................................................................... 19
Step 6. Adjust System On-Time, °F/°C, As Required ................................................................... 19
Step 7. Mount Thermostat Mounting Plate ................................................................................... 21
Step 8. Wire Thermostat Terminals ..............................................................................................23
Step 9. Mount Thermostat ............................................................................................................ 27
Step 10. Check Thermostat Operation After Programming and Installing ................................... 28
Step 11. Set Fan and System Switches ....................................................................................... 30
Troubleshooting Guide ................................................................................................................. 31
Limited One-Year Warranty .......................................................................................................... 35

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Step 1. Prepare for Installation
❑Check Table 1 to make sure this thermostat is compatible with your system. If not, return it to the
retailer. For more information, call Honeywell Consumer Services, 1-800-468-1502, Monday -
Friday, 7 am to 5:30 pm, Central time.
Not compatible with any 120/240 volt circuit.
aCompatible with Honeywell 2-wire zone valves. Isolating relay required for 3-wire thermostats for zone valves.
Not compatible with 2-wire White-Rodgers no. 1361 valves.
bCompatible with hot water baseboard systems. Does not work efficiently on steam or gravity systems.
Table 1. Compatibility Information.
System Type Compatible with CT2095
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yesa,b
Gas—Millivolt No
Oil-Fired Boilers Yesa,b
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No

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❑Acquire tools and items as needed (see illustration). Also purchase two AA alkaline batteries; we
recommend Energizer® batteries.
M13544
CROSS-RECESSED
SCREWDRIVER
HAND OR
POWER DRILL
WITH 3/16 INCH
DRILL BIT, IF NEEDED
TO DRILL HOLES
IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE

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Step 2. Remove Old Thermostat
❑Test to be sure your heating and cooling
systems are working properly. If either does
not work, contact your local heating/air
conditioning dealer. To avoid compressor
damage, do not operate the cooling system
when outdoor temperature is below 50°F
(10°C).
❑Turn off power to the system at the furnace,
or at the fuse/circuit breaker panel.
❑Carefully unpack your new thermostat and
mounting plate, saving package of screws,
instructions and receipt.
❑Remove cover from old thermostat. If it does
not snap off when pulled firmly from the
bottom, check for a screw used to lock on
the cover.
❑Loosen screws holding thermostat to
subbase, wallplate or wall, and lift away.
❑Disconnect wires from old thermostat or
subbase. As you disconnect each wire,
attach one of the enclosed labels to each old
terminal designation. If there are only two
wires, they do not need labeling. If there is
an extra wire that is not connected to your
old thermostat, you also do not connect it to
your new thermostat. Keep the wires from
falling back into the wall by wrapping them
around a pencil as shown.
WIRES THROUGH
WALL OPENING
M5136

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Replacing a Clock Thermostat that has
C or C1 Clock Terminals?
If you are replacing a Honeywell Chronotherm®
Thermostat, you may find one or two wires that
go to the C or C1 clock terminals on the
Chronotherm®Thermostat wiring wallplate. Do
not allow them to touch, or you can damage
your transformer. Disconnect the wires and
wrap them separately, using electrical tape. Do
not wrap them together. Place the wires where
they do not interfere with the operation of the
new thermostat. Recordthe colors andterminal
designation labels of the remaining wires.
Six or more wires?
If there are six or more wires (excluding clock
wires attached to terminals), you probably have
a variation of a heat pump or multistage
system. This thermostat is not compatible with
those systems so return the product to the
retailer. If you want information about the
programmable thermostats that work with your
system, call Honeywell Consumer Services at
1-800-468-1502.
Three thermostat wires?
If you have three wires for heating only and can
operate the fan using the fan On switch, this
thermostat works with your system. However,
some hot water (zoned) heating systems have
three thermostat wires. The thermostat does
not work without installing an isolating relay on
these systems. For details, call Honeywell
Consumer Services at 1-800-468-1502.

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Step 3. Install Batteries
IMPORTANT
Batteries must be installed for the pro-
gramming and operation of the ther-
mostat and heating/cooling system.
❑Purchase two AA alkaline batteries; non-
alkaline batteries do not last as long, and
can leak, causing damage to the thermostat
or the wall surface. We recommend
Energizer®batteries.
❑Open the top cover of thermostat to access
control panel and battery compartment.
❑Make sure the thermostat is set to the Off
position.
❑Use a coin to remove the battery cover.
M12492
REMOVING
BATTERY
DOOR
BATTERY
DOOR COVER

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❑Install the fresh batteries as shown, making
sure positive and negative terminals are
oriented correctly.
❑Replace the battery cover.
As the batteries run low, a bAt Lo indicator
flashes for one to two months before the
batteries run out completely. Replace the
batteries as soon as possible after the indicator
starts flashing. If you do not replace the
batteries sometime during the flashing bAt Lo,
the indicator eventually stops flashing. bAt Lo
then stays on without flashing, indicating the
thermostat and heating/cooling system have
stopped working and the batteries are almost
completely dead.
After the batteries are completely dead, the
bAtLo indication disappears, leaving a
completely blank display.
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M1713

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Press down on the left ends of batteries to
remove them. If you insert the new batteries
within 20 to 30 seconds of removing the old
ones, you do not need to reprogram the
thermostat. However, if the display is blank, the
batteries are dead or incorrectly installed and
you must reprogram. See Step 4.
IMPORTANT
Although the thermostat has a low bat-
tery indicator, replace the batteries
once a year to prevent the thermostat
and heating/cooling system from shut-
ting down due to lack of battery power.
As a precaution, when leaving home
for longer than a month, change bat-
teries before you leave to prevent the
system from shutting down due to lack
of battery power.