Honeywell T8002 User manual

® U.S. Registered Trademark
Copyright © 2002 Honeywell • •All Rights Reserved
INSTALLATION INSTRUCTIONS
69- 1549
T8002
Programmable Thermostat
APPLICATION
The T8002 Thermostat provides single-stage, program-
mable temperature control for 24 Vac heating-cooling
systems with manual changeover from heat to cool. See
Table 1. Heating cycle rate is selectable at 1, 3, 4, 5, 6, 9,
or 12 cph. Cooling cycle rate is fixed at 3 cph. Temper-
ature indication can be set for °F or °C. See Table 1.
The T8002 Thermostat is powered with three AA alkaline
batteries. Setpoints and programming are held
permanently by non-volatile memory.
The T8002 Thermostat includes a thermostat, wallplate,
batteries, and Owner’s Guide.
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of it properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of a control.
INSTALLATION
When Installing this Product ...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Hazardous Voltage.
Can damage heating/cooling system.
Disconnect power at furnace or main breaker/
fuse box.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1. Do not install the thermostat where it can be
affected by:
— drafts or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from the sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Table 1. T8002 Thermostat Description.
Model System Changeover System Selection Fan Selection Powering Method
T8002 Heat-Cool Manual Cool-Off-Heat Auto-On Batteries
This is a legacy product document
supported by Resideo. It is no
longer manufactured

T8002 PROGRAMMABLE THERMOSTAT
69-1549 2
Fig. 1. Selecting typical thermostat location.
Mounting Wallplate to Wall
IMPORTANT
Level only for appearance. The thermostat func-
tions normally even when not level.
Mount the wallplate to the wall with the screws provided
(see Fig. 2) as follows:
1. Place the wallplate at the desired location on the
wall.
2. Pull the thermostat wire through the wallplate
entrance hole.
3. Fasten the wallplate to the wall using the anchors
and screws provided.
4. After wiring the wallplate, plug the hole with non-
flammable insulation to prevent drafts from affect-
ing the thermostat.
Fig. 2. Mounting wallplate to wall.
Wiring
IMPORTANT
Use an 18-gauge maximum wire to wire the
thermostat.
All wiring must comply with local electrical codes and
ordinances. Disconnect the power supply to prevent
electrical shock or equipment damage.
The shape of the terminals allows inserting straight or
wraparound wiring connections; either method is
acceptable. A letter code is located near each terminal
for identification. See Fig. 3.
NOTE: To ensure accurately mounting the thermostat,
restrict all wiring to the shaded area in the cen-
ter of the terminals. See Fig. 4.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M11338
M12202A
WALL WALL
ANCHORS (2)
WALLPLATE
WHEN USING WALL ANCHORS, DRILL 3/16 INCH
HOLES FOR DRYWALL, 7/32 INCH HOLES FOR
PLASTER OR WOOD.
MOUNTING
SCREWS (2)
1
1

T8002 PROGRAMMABLE THERMOSTAT
3 69-1549
Fig. 3. Connecting wiring.
Fig. 4. Restricting wiring to shaded areas.
The thermostat is adaptable to most 18 to 30 Vac
heating-cooling systems. Refer to Fig. 5, 6 and 7 for
typical wiring hookups.
Fig. 5. Typical heat-cool system hookup with single
transformer.
Fig. 6. Typical heat-cool system hookup with two
transformers.
TERMINAL
SCREW
M12559
G
R
Rc
Y
WB
O
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
KEEP WIRING IN
SHADED AREA
MOUNTING
SCREW HOLE
MOUNTING
SCREW HOLE
WIRING ENTRANCE
HOLE
M12560
G
R
Rc
Y
WB
O
L1
(HOT)
L2
M20510
FAN
RELAY
T8002 THERMOSTAT
COMPRESSOR
CONTACTOR
TRANSFORMER
COOL
DAMPER
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
JUMPER R TO Rc.
2
2
2
1
Y
G
Rc
W
3
R
B
O
HEAT
RELAY
HEAT
DAMPER
3
Y
G
Rc
W
2
R
B
O
M20511
L1
(HOT)
L2
FAN
RELAY
HEAT
RELAY
L1
(HOT)
L2
COMPRESSOR
CONTACTOR
HEATING
TRANSFORMER
COOLING
TRANSFORMER
HEAT
DAMPER
COOL
DAMPER
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER
SYSTEM.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
2
3
3
1
1
3
T8002 THERMOSTAT

T8002 PROGRAMMABLE THERMOSTAT
69-1549 4
Fig. 7. Typical single-stage heat pump system
hookup.
Setting Fan Operation (Fuel) Switch
The fan operation (fuel) switch is preset at the factory in
the F position. See Fig. 8. This is the correct setting for
most systems. If this system is an electric heat system or
single-stage heat pump, set the switch to the E position,
which allows the fan to turn on immediately with the
heating or cooling equip-ment in a system where the G
terminal is connected.
Fig. 8. Fan operation (fuel) switch.
Mounting Thermostat to Wallplate
1. Slide System switch to Off position.
2. Engage the tabs at the top of the thermostat and
wallplate.
3. Swing down the thermostat and press the lower
edge of the thermostat onto the wallplate to latch.
See Fig. 9.
Fig. 9. Mounting thermostat to wallplate.
Installing Batteries
The thermostat requires three AA alkaline batteries to
operate:
1. Remove the battery door, located on the right side
of the thermostat, by pulling outward from the bot-
tom. See Fig. 10.
2. Insert the three AA alkaline batteries (included) as
shown in Fig. 10.
NOTE: The thermostat shows a “bAtLo” message on
the digital display to alert the homeowner one to
two months before the batteries run out com-
pletely.
IMPORTANT
Homeowner should replace the batteries once a
year to prevent leakage and/or the heating/cool-
ing system from shutting down due to lack of
battery power in the thermostat.
L1
(HOT)
L2
M20512
FAN
RELAY
T8002 THERMOSTAT
COMPRESSOR
CONTACTOR
TRANSFORMER
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER Y TO W.
JUMPER R TO Rc.
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
2
1
Y
G
Rc
W
3
4
R
B
O
2
HEAT
CHANGEOVER
VALVE
COOL
CHANGEOVER
VALVE
3
4
M20530
FAN OPERATION (FUEL) SWITCH
F
E
M20513
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON WALLPLATE.
PRESS LOWER EDGE OF
CASE TO LATCH.
A
B
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
TUE
PM

T8002 PROGRAMMABLE THERMOSTAT
5 69-1549
Fig. 10. Installing batteries.
Installer Setup
Setting °F/°C Indication and Heat Cycle Rate
The following instructions provide information to change
the heating cycle rate to match the heating equipment
and to choose either the Fahrenheit (°F) or Celsius (°C)
display.
NOTE: All four steps must be completed to save
changes to the °F/°C indication and the heat
cycle rate.
1. Enter Installer Setup.
a. Use ▲ or ▼ keys to set the temperature set-
point to 52°F (11°C).
b. Press the ▲ and ▼ keys simultaneously for
more than two seconds to enter Installer Setup.
c. Release the keys to display the three-digit soft-
ware revision code. (Information displayed var-
ies by model.).
d. Press the ▲ key. FC (factory configuration) is
displayed. (A typical example is shown, but
information displayed varies by model. This
information is for factory use only.)
Optional System Checkout
When in steps 1.c. and 1.d. only, the ▼ key can be
pressed to turn heat or cool outputs on and off. Change
the System switch setting to test heat or cool outputs. No
action takes place if the System switch is in the Off
position.
Examples:
System setting at Heat: If heat is on, pressing the ▼
key turns it off; if heat is off, pressing the ▼ key turns it
on.
System setting at Cool: If cool is on, pressing the ▼
key turns it off; if cool is off, pressing the ▼ key turns it
on. The five-minute minimum off time is bypassed.
NOTE: In Installer Setup only, each press of the ▼ key
momentarily displays 1. Each press of the ▼
key momentarily displays 2. When the keys are
released, these one-digit codes are no longer
displayed.
2. Setting °C or °F.
a. Press the ▲ key again to display the current
setting.
M20514
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
TUE
PM
AA BATTERIES (3)
M12582A
SET
HT.
M12583
M12584A
M12587A

T8002 PROGRAMMABLE THERMOSTAT
69-1549 6
b. Press the ▼ key to change the °C or °F
indication.
3. Setting Heat Cycle Rate (see Table 2 for the cycle
rate options and equipment).
a. Press the ▲ key to display the current heat
cycle rate setting of 1, 3, 4, 5, 9, or 12 cph.
b. If the desired cycle rate is displayed, press the
▲ key to display heating and cooling algorithm
default.
c. To change the heat cycle rate, press the ▼ key
until your choice of 1, 3, 4, 5, 6, 9, or 12 is dis-
played.
d. Press the ▲ key to display the heating and
cooling algorithm configuration default.
e. Press the ▼ key to change the heating and
cooling algorithm to C1 or C3.
C1 = Standard algorithm.
C3 = Aggressive algorithm (Default. Can cause
overshooting).
f. Press the ▲ key. Current configuration (CC) is
displayed. A typical example is shown, but CC
varies by model. (This information is for factory
use only.)
4. Exit Installer Setup.
a. Press the ▲ key to save all changes and return
to normal operation.
aHigh efficiency furnace (90+).
bRefer to the equipment manufacturer’s instructions.
Operation
Setting Fan and System Switches
Fan and System settings are controlled manually by
using the switches located at the bottom of the
thermostat case. See Fig. 11.
FAN SWITCH
Fan switch settings are:
On: The fan runs continuously. Use for improved air
circulation and air quality.
Auto: Normal setting for most homes. In cooling, the
fan starts and stops with the cooling equipment. In
heating, the fan is controlled directly by the heating
equipment and may start a few minutes after the
heating equipment turns on (most systems). When
the fan operation (fuel) switch is in the E position,
the fan starts and stops with the heating equip-
ment.
Slide the Fan switch in the lower left corner of the
thermostat to select the desired fan setting.
SYSTEM SWITCH
System switch settings (see Fig. 11) are:
Cool: The thermostat controls the cooling system.
Off: Both heating and cooling are off.
Heat: The thermostat controls the heating system.
Slide the System switch in the lower right corner of the
thermostat to select the desired system setting.
M12586A
M12588A
M12589A
M14691
M14692
Table 2. Heating Cycle Rate.
System Cycles Per Hr
Steam, Gravity 1
Hydronic Heat, Condensing Gas
Furnacesa
3
Gas or Oil forced Air (Default) 6
Electric Heat 9
Special Applicationsb4, 5, 12
M12590A
PM

T8002 PROGRAMMABLE THERMOSTAT
7 69-1549
Fig. 11. Digital display and System switches.
Setting Current Time and Day
1. To set current time:
a. Press Select twice.
b. Press the ▲ or ▼ key to set current time.
2. To set day of week:
a. Press Select again.
b. Press ▲ or ▼ key to set current day.
To use the preprogrammed time and temperature (see
Table 3), press Hold to exit the time and day mode.
Setting Time and Temperature
The thermostat is preprogrammed with the time and
temperature settings shown in Table 3. For instructions
on programming the thermostat, refer to the Owner’s
Guide.
CHECKOUT
Heating
1. Slide the System switch to Heat and the Fan switch
to Auto.
2. Press and hold the ▲ key to raise the temperature
setting several degrees above the room tempera-
ture; the heating equipment should start. In con-
ventional systems, the system turns on the fan
through the use of a time delay relay or through a
limit control. When the fan operation (fuel) switch is
in the E positions, the fan starts immediately.
3. Press the ▼ key to lower the temperature setting
below the room temperature. Heating equipment
should stop.
Cooling
CAUTION
Compressor Damage Hazard.
Operating at too low of an outdoor
temperature can cause compressor damage.
Do not operate cooling if outdoor temperature is
below 50°F (10°C).
Allow compressor to remain off for five minutes
before restarting.
Refer to manufacturer’s recommendations.
1. Slide the System switch to Cool and the Fan switch
to Auto.
2. Press the ▼ key to lower the temperature setting
several degrees below the room temperature; the
cooling equipment should start. The fan starts and
stops with the cooling equipment.
NOTE: If the cooling system does not start immediately,
remember that the thermostat has a built-in min-
imum off-time of five minutes to protect the com-
pressor.
3. Press the ▲ key to raise the temperature setting
above the room temperature. Cooling system
should shut down.
M20515
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
TUE
PM
M12591A
SET
PM
M12592A
SET
PM
M12593A
M12594A
Table 3. Preprogrammed Time and
Temperature Settings.
Period Time
Heat
Setpoint
Cool
Setpoint
Wake 6:00 AM 70°F (21°C) 78°F (26°C)
Leave 8:00 AM 62°F (17°C) 85°F (29°C)
Return 6:00 PM 70°F (21°C) 78°F (27°C)
Sleep 10:00 PM 62°F (17°C) 82°F (28°C)

69-1549 G.H. 03-02 www.honeywell.com/yourhome
T8002 PROGRAMMABLE THERMOSTAT
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Fan
1. Slide the System switch to Off and the Fan switch
to On. The fan should run continuously.
2. Slide the Fan switch to Auto. The fan should turn
off.
IMPORTANT
Be sure all equipment responds correctly to the
thermostat.