Honeywell T8000C User manual

X-XX UL
INSTALLATION INSTRUCTIONS
®U.S. Registered Trademark
Copyright © 2002 Honeywell • • All Rights Reserved
T8000C
Programmable Thermostat
APPLICATION
The T8000C Thermostat provides single-stage, program-
mable temperature control for 24 Vac heating-cooling
systems with manual changeover from heat to cool.
Heating cycle rate is selectable at 1, 3, 4, 5, 6, 9, or 12
cph. Cooling cycle rate is fixed at 3 cph. Temperature
indication can be set for °F or °C.
The T8000C Thermostat is powered through the heating/
cooling system controls. Batteries are not required
because setpoints are held permanently by non-volatile
memory.
The T8000C model includes a thermostat, wallplate and
owner’s guide. A 7-3/8 in. (188 mm) x 5-3/4 in. (146 mm)
decorator cover plate (for covering wall marks) is available
separately. Order Honeywell part no. 209649A (taupe) or
part no. 209649B (white).
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.
Model System Changeover System Selection Fan Selection Powering Method
T8000C Heat-Cool Manual Cool-Off-Heat Auto-On Power Stealing
Table 1. Description of T8000C Thermostats.
69-1434-1

69-1434–1 2
T8000C PROGRAMMABLE THERMOSTAT
Fig. 1. Typical location of thermostat.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M11338
Mounting Wallplate to Wall
IMPORTANT
Level only for appearance. The thermostat
functions normally even when not level.
Mount wallplate and the T8000C 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 affecting
the thermostat; see Wiring section.
M12202
WALL WALL
ANCHORS (2)
WALLPLATE
MOUNTING
SCREWS (2)
Fig. 2. Mounting wallplate to wall.
Wiring
IMPORTANT
Use an 18-gauge maximum wire for wiring the
T8000C 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 permits insertion of straight or
wraparound wiring connections; either method is accept-
able. A letter code is located near each terminal for
identification. See Fig. 3.
NOTE: To ensure proper mounting of thermostat, restrict
all wiring to the shaded area in the center of the
terminals. See Fig. 4.
TERMINAL
S
CREW
M12559
G
R
Rc
Y
WB
O
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM
)
Fig. 3. Wiring connections.

69-1434–1
3
T8000C PROGRAMMABLE THERMOSTAT
KEEP WIRING IN
SHADED AREA
MOUNTING
SCREW HOLE MOUNTING SCREW HOLE
WIRING ENTRANCE
HOLE
M12560
G
R
Rc
Y
WB
O
Fig. 4. Restrict wiring to shaded area.
The T8000C Thermostat is powered through the heating/
cooling system controls and 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 hookup of T8000C in heat-cool system
with single transformer.
Fig. 6. Typical hookup of T8000C in heat-cool system
with two transformers.
L1
(HOT)
L2
M12561
FAN
RELAY
T8000C 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
3
2
2
1
Y
G
Rc
W
3
R
B
O
HEAT
RELAY
HEAT
DAMPER
Y
G
Rc
W
2 4
R
B
O
M12562
T8000C THERMOSTAT
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 JUMPER RC TO R WHEN INSTALLED ON A TWO TRANSFORMER
SYSTEM.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN
THE OFF POSITION.
2
3
3
1
1
3
4

69-1434–1 4
T8000C PROGRAMMABLE THERMOSTAT
Fig. 7. Typical wiring diagram for T8000C on zone 1
MABS II/L control panel.
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, set
the switch to the E position. The E setting allows the fan to
turn on immediately with the heating or cooling equipment
in a system where the G terminal is connected.
T8
T7
T6
T5
O1
G1
B1
E1
T4
ZONE
1
CHANGEOVER
CONTROL
M12563
Y
G
Rc
W
1
1 JUMPER R TO RC.
R
B
O
T8000C THERMOSTAT
M1258
0
FAN OPERATION (FUEL) SWITCH
F
E
Fig. 8. Fan operation (fuel) switch.
Mounting Thermostat to Wallplate
1. Slide SYSTEM switch to the 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.
Installer Setup
Setting °F/°C Indication and Heat Cycle Rate
The following instructions provide the information neces-
sary to change the heating cycle rate to match the heating
equipment and to choose either 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.
M1467
4
DASHED LINES INDICATETABS
ON BACK OFTHERMOSTAT
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

69-1434–1
5
T8000C PROGRAMMABLE THERMOSTAT
1. Enter Installer Setup.
a. Use ▲or ▼keys
to set the tem-
perature setpoint
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 software
revision code.
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 1c and 1d 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.
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, 6, 9, or 12 cph.
b. If the desired cycle
rate is displayed,
press the ▲key to
exit the installer
setup.
c. To change the
heat cycle rate,
press the ▼key until your choice of 1, 3, 4, 5,
6, 9, or 12 is displayed.
d. Press the ▲key to
display cooling
algorithm configu-
ration default.
e. Press the ▲key
again to change
cooling algorithm to C1 or C3.
C1 = Standard cooling algorithm.
C3 = Agressive cooling algorithm (can
cause overshooting).
f. Press the ▲key again. 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.
Table 2. Heating Cycle Rate
M12590A
PM
System Cycles Per Hour
Steam, Gravity 1
Hydronic Heat, Condensing
Gas Furnaces
a
3
Gas or Oil Forced Air 6
Electric Heat 9
Special Applications
b
12
a
High efficiency furnace (90+).
b
Refer to the equipment manufacturer’s Instructions.
M1469
1
M1469
2
M12582
A
SET
HT.
M12583
A
M12584
A
M12586
A
M12587
A
M12589
A
M12588
A
4, 5, 12

69-1434–1 6
T8000C PROGRAMMABLE THERMOSTAT
SYSTEM Switch
System switch settings control thermostat operation as
follows:
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.
Setting Current Time and Day
1. To Set Current Time.
a. Press Select twice.
b. Press ▲or ▼to
set current time.
2. To Set Day of Week.
a. Press Select
again.
b. Press ▲or ▼to
set current day.
M12591
A
SET
PM
M12592
A
SET
PM
M12593
A
M12594
A
SYSTEM
Cool Off Heat
Auto On
FAN
M14693
Hold
Select
TUE
PM
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. 10.
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 equipment.
Slide the FAN switch in the lower left corner of the
thermostat to select the desired fan setting.
Fig. 9. Digital Display and System Switches.
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)
To use the preprogrammed time and temperature (see
Table 3), press Hold to exit the programming mode.
Setting Time and Temperature
The T8000C is preprogrammed with the time and tem-
perature settings shown in Table 3. For instructions on
programming the thermostat refer to the Owner’s Guide,
form no. 69-1143.
Table 3. Preprogrammed Time
and Temperature Settings.
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 conven-
tional 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 position, the fan starts immediately.
3. Press the ▼key to lower the temperature setting
below the room temperature. Heating equipment
should stop.

69-1434–1
7
T8000C PROGRAMMABLE THERMOSTAT
Cooling
CAUTION
Damage To Compressor Possible.
Operating at too low of an outdoor temperature
may 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 minimum off-time of five
minutes to protect the compressor.
3. Press the ▲key to raise the temperature setting
above the room temperature. Cooling system should
shut down.
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. In heating, the fan is
controlled directly by the heating equipment and
may start a few minutes after the heating equipment
turns on (on most systems). When the fan operation
(fuel) switch is in the E position, the fan starts and
stops with the heating equipment. In cooling, the fan
starts and stops with the cooling equipment.
Make certain all equipment responds correctly to the
thermostat.

69-1434–1 8
T8000C PROGRAMMABLE THERMOSTAT
69-1434–1 G.H. Rev. 2-02 Printed in Mexico www.honeywell.com/yourhome
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