/
T8511G Deluxe Heat Pump
Zone Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The T8511G Deluxe Heat Pump Zone Thermostat provides electronic control of 24 Vac heat pump zoned systems. Refer
to Table 1 for a general description of the thermostat.
Table 1. Description of T8511 Thermostat.
Model Application Powering Method Changeover System Selection Fan Selection
T8511G Zone 1 on MABS II or
TotalZone® system
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
hazardous 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 completing installation, use these instructions
to check out the product operation.
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.
Requires common wire to
power supply
not
place your old
Automatic or
Manual
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 sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wallplate Installation
The thermostat can be mounted horizontally on the wall or
on a 2 in. x 4 in. wiring box. Position wallplate horizontally
on the wall or on a 2 in. x 4 in. wiring box.
1. Position and level the wallplate (for appearance
only). The thermostat will function properly even
when not level.
2. Use a pencil to mark the mounting holes. See Fig. 2.
3. Remove the wallplate from the wall and drill two
3/16 inch holes in the wall (if drywall) as marked.
For firmer material such as plaster, drill two 7/32 inch
holes. Gently tap anchors (provided) into the drilled
holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
Em Heat-Heat-Off-
Cool-Auto
On-Auto
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • • All Rights Reserved
X-XX UL
69-1052-1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
WALL
ANCHORS
(2)
NO
WIRES
THROUGH WALL
YES
NO
5 FEET
[1.5 METERS]
Fig. 1. Typical location of thermostat.
WALL
Wiring
All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 and 4 for typical hookups. A
letter code is located near each terminal for identification.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 5.
IMPORTANT
MOUNTING
HOLES
MOUNTING
SCREWS
M6530
2. Securely tighten each terminal screw.
3. Push excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
NO
M10106
CAUTION
Disconnect power before wiring to prevent
electrical shock or equipment damage.
Use 18 gauge, color-coded thermostat cable for
proper wiring.
69-1052—1
Fig. 2. Mounting the wallplate.
2
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
OUTDOOR
TEMPERATURE
SENSOR
OGB LC RY EW2 OT OT
O1
G1
B1
E1
CHANGEOVER
CONTROL
Fig. 3. Typical wiring diagram for T8511G with zone 1
BELGYROW2COT
W2 L G Y R W M6 M4 M1
TotalZone® PANEL THERMOSTAT CONNECTIONS
1WHEN USING W2 ON THE THERMOSTAT TO CONTROL THE SECOND
STAGE OF HEATING, BE SURE THE STAGE JUMPER IS IN PLACE ON
THE TZ PANEL.
Fig. 4. Typical wiring diagram for T8511G with zone 1
THERMOSTAT
MABS II control panel.
THERMOSTAT
1
TotalZone® control panel.
FOR STRAIGHT
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
INSERTION STRIP
5/16 IN. (8 MM).
ZONE 1
T8
T7
T6
T5
T4
M1
M12188
OUTDOOR
TEMPERATURE
SENSOR
(OPTIONAL)
OT
M4826
M12189
Fig. 5. Proper wiring technique.
Mounting Thermostat
1. Engage tabs at the top of the thermostat and
wallplate. See Fig. 6.
2. Press lower edge of case to close and latch.
NOTE: To remove the thermostat from the wall, first pull out
at the bottom of the thermostat; remove top last.
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
B.
PRESS LOWER EDGE OF CASE TO LATCH.
M6798A
Fig. 6. Mounting thermostat on wallplate.
Using Thermostat Keys
The thermostat keys are used to:
• set temperature,
•display present setting,
• configure Installer Setup,
• check System-Test,
•display outdoor temperature (select models),
• set the system operation,
• set the fan operation.
See Fig. 7 for the location of the keys.
INCREASE
TEMPERATURE
SETTING
i
DECREASE
TEMPERATURE
SETTING
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
M6801
Fig. 7. Key locations and descriptions.
3
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
SETTINGS
System and Fan Settings
System settings control the thermostat operation as
follows:
Em Heat: Emergency heat relay is automatically
controlled by the thermostat. The cooling system is
off. The compressor is de-energized.
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
The system default setting is Heat and the fan default
setting is Auto. Use the keyboard to change to the desired
settings. See Fig. 8.
i
Fan
System
Press to select
Press to select
heating or cooling
heating or cooling
equipment.
equipment.
Em. Ht.
-Emergency heating
On— Fan runs continuously
Heat—Heating equipment
Auto—Fan runs when
Off — No equipment
Cool—Cooling equipment
Auto—Thermostat
automatically selects
heating and cooling
equipment.
CHECK LIGHT ON SELECT MODELS
1
heating or cooling
equipment operates
System
Fan
1
Fig. 8. Thermostat System and Fan key location.
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
System
Fan
M10147
The Installer Setup is used to customize the thermostat to
specific systems. Some of the options include temperature
display, changeover and outdoor temperature display.
Installer Setup numbers are listed in Table 2. The table
includes all the configuration options and the factory
settings for the T8511G.
A combination of key presses are required to use the
Installer Setup feature.
— To enter the Installer Setup, press and hold the
Information i key with the increase ▲ and decrease
▼ keys until the first number is displayed. All display
segments appear for approximately three seconds
before the number is displayed. See Fig. 9 and 10.
— To advance to the next Installer Setup, press the
Information i key.
— To change a setting, use the increase ▲ and de-
crease ▼ keys.
— To exit the Installer Setup, press and hold the
Information i key until the display returns to normal
(approximately three seconds). The display will scroll
the numbers backwards to get to the normal display.
The Installer Setup is automatically exited if no key
presses are made for ten minutes.
Em Ht Temporary Setting
Aux Ht
Remote
Room
%Humid
Repl
Wait
Batt
System Fan
Heat Cool
Em HeatOffCool Auto Only
Fig. 9. Display of all the segments of the LCD.
INSTALLER SETUP
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
Outdoor
OnAuto
M4844
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
Temperature Settings
The default setpoint for heat is 70°F (21°C) and for cool is
78°F (25.5°C). Press the increase ▲ or decrease ▼ key to
change the present setting to change between heat and
cool, press the Information i key until the setting to be
changed appears. Press the increase ▲ or decrease ▼
key to adjust the setting.
INSTALLER SETUP
NOTE: For most applications, the thermostat factory
settings will not need to be changed. Review the
factory settings in Table 2 and if no changes are
necessary, go to the Installer System-Test
section.
69-1052—1
M10105A
Fig. 10. Display of Installer Setup number and setting.
IMPORTANT
Only configurable numbers are shown on the
device. Example: If thermostat does not have
outdoor temperature capability, Installer Setup
Number 24 will not be displayed. Review Table 2
factory-settings and mark any desired changes in
the Actual Settings column. When Installer Setup
is complete, review the settings to confirm that
they match the system.
4
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Table 2. Thermostat Installer Setup Options.
Installer Setup
Select
Number
(Press i key
to change)
Factory Setting
Display Description Display Description
Not used 01 thru 04 — — — — —
Heating cycle
rate
05 06 Stage 2
06 — Not used
03, 06 03—3 cph used for hot water
or 09 systems
07 06 Emergency heat 06—6 cph used for heat pump
Not used 08 thru 11 — — — — —
Changeover 12 01 Manual changeover 00 or0200—Automatic changeover
Not used 13 — — — — —
Degree tempera-
ture display
14 00 Temperature is
displayed in °F
01 Temperature is displayed
Not used 15 thru 18 — — — — —
Extended fan
operation in
heating
Extended fan
operation in
cooling
19 00 No extended fan
20 00 No extended fan
operation after the
call for heat ends
operation after the
call for cool ends
01 Fan operation is extended
01 Fan operation is extended
Not used 21 thru 23 — — — — —
Outdoor
temperature
a
display
24 00 No outdoor
temperature is
displayed
01 Outdoor temperature is
Not used 25 thru 32 — — — — —
Minimum off time
for the
compressor
Heating setpoint
range stop
Cooling setpoint
range stop
System on
indicator
(flame=heat,
snowflake=cool)
is displayed
Temperature
display
adjustment
a
a
a
a
Available on select models.
33 05 5 minute minimum off
34 90 Heating setpoint can
35 48 Cooling setpoint can
36 00 LCD On symbol is
37 00 No difference in
time for the
compressor
be set no higher than
90°F
be set no lower than
48°F
displayed when
system is energized
displayed
temperature and
actual room
temperature
00, 01,
02, 03
or 04
40 thru90Number can be set anywhere
48 thru99Number can be set anywhere
01 Display is disabled
-3 thru0301—Display adjusts to 1°F higher
Other Choices
(Press ▲ or ▼ key to change)
systems
09—9 cph used for electric heat
systems
02—Auto only
in °C
90 seconds after the call for
heat ends
90 seconds after the call for
cool ends
displayed. Needs a C7089B1000
Outdoor Sensor to operate.
Minimum number of minutes
(0 thru 5) the compressor will be
off between calls for the
compressor
between 40 and 90 in 1°F
increments
between 48 and 99 in 1°F
increments
than actual room temperature
02—Display adjusts to 2°F higher
than actual room temperature
03—Display adjusts to 3°F higher
than actual room temperature
-1—Display adjusts to 1°F lower
than actual room temperature
-2—Display adjusts to 2°F lower
than actual room temperature
-3—Display adjusts to 3°F lower
than actual room temperature
Actual
Setting
—
5
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
IMPORTANT
Review the settings to confirm that they match
the system. To exit the Installer Setup, press and
hold the Information
returns to normal (approximately three seconds).
i
key until the display
INSTALLER SYSTEM-TEST
Use the Installer System-Test to check the thermostat
operation. Refer to Table 3 for a list of the available
system-tests.
To start the system-test:
CAUTION
The minimum off time for compressors is bypassed
during the Installer System-Test. Equipment damage
can occur if the compressor is cycled too quickly.
Press and hold the increase ▲ and decrease ▼ keys at
the same time, until two zeros appear. All segments of the
LCD will be displayed before the two zeros appear. See
Fig. 11 and 12.
Table 3. Tests Available In the Installer System-Test.
Test
Number System-Test Description
10-19 Heating equipment can be turned on
20-29 Emergency heat (select models)
30-39 Cooling equipment can be turned on
40-49 Fan equipment can be turned on and off
60-69 Keyboard keys test
70-79 Thermostat information including date
Key to
Press
Heating Equipment System-Test
Emergency Heating Equipment System-Test (select models)
Cooling Equipment System-Test
and off
equipment can be turned on and off
and off
code and software versions are displayed
Table 4. Installer System-Test Options.
Test
Number Description
i 10 Enter heating equipment system-test.
▲ 11 Stage-one heat comes on. System fan is also energized.
▲ 12 Stage-two heat comes on. Stage-one heat and system fan remain on.
▼ 11 Stage-two heat turns off.
▼ 10 Stage-one heat and system fan turn off.
i 20 Changing from heating to emergency heating equipment system-test.
▲ 21 Emergency heat comes on. System fan also comes on.
▼ 20 Emergency heat turns off.
i 30 Change from heating or emergency heating to cooling equipment system-test.
▲ 31 Cool and system fan come on.
▼ 30 Cool and system fan turn off.
Em Ht Temporary Setting
Aux Ht
Repl
Wait
Batt
System Fan
Heat Cool
Em HeatOffCool Auto Only
Fig. 11. Display of all the segments of the LCD.
TEST MODE NUMBER
Fig. 12. Display of test number.
Refer to Table 4 for the directions and results of the
specific tests.
NOTE: Press and hold the increase ▲ and decrease ▼
keys together for three seconds to exit the
system-test. The system-test will time out after
ten minutes without any key presses.
Remote
Room
%Humid
Outdoor
OnAuto
M4844
M6792
(Continued)
69-1052—1
6
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Key to
Press
Table 4. Installer System-Test Options
Test
Number Description
(Continued)
.
Fan Equipment System-Test
40 Change from cooling to fan equipment system-test.
i
▲ 41 Fan comes on.
▼ 40 Fan turns off.
Key Operation System-Test
IMPORTANT
Test numbers will only be displayed when the system is configured for the selected function.
EXAMPLE: Numbers 60, 61 and 62 are the only numbers that will be displayed when a system
is configured for heat only.
System Key System-Test
60 Change from cooling or fan to key operation system-test.
i
System 61 Heat Test Number is displayed.
System 62 Off Test Number is displayed.
System 63 Cool Test Number is displayed.
System 64 Auto Test Number is displayed.
System 65 Emergency heat Test Number is displayed.
Fan Key System-Test
Fan 68 Fan on Test Number is displayed.
Fan 69 Fan off Test Number is displayed.
NOTE: Press and hold the increase ▲ and decrease ▼ keys together for three seconds to exit the system-test. The
system-test will time out after ten minutes without any key presses.
THERMOSTAT INFORMATION
1. Press the Information i key to access the thermo-
stat information.
3. Press the increase ▲ key again to display the
software identification code.
M4864
2. Press the increase ▲ key to display the production
date code. The first two large digits are the month
and the third digit is the last digit of the year (Example: 027=February 1997).
M10444
4. Press the increase ▲ key again to display the
software revision number (Example: 001=Revision
number 1).
7
M4866
M6791
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
5. Press the increase ▲ key again to display the
EEPROM identification code.
CHECKOUT
Outdoor Temperature Sensor
(Where Applicable)
Allow the outdoor temperature sensor to soak in the
outdoor air for a minimum of five minutes before taking a
reading. With an accurate thermometer (±1°F [±0.5°C]),
measure the temperature at the sensor location, allowing
time for the thermometer to stabilize before reading. Match
the thermometer reading to the outdoor temperature
display at the thermostat.
6. Press and hold the increase ▲ and decrease ▼
keys together, until the room temperature is
displayed, to exit the system-test. The system-test
times out after ten minutes without any key presses.
M4867
TROUBLESHOOTING GUIDE
Symptom Possible Cause Action
Display will not
come on.
Temperature
display is incorrect.
Temperature
settings will not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)
a
Available on select models.
Thermostat is not being
powered.
Thermostat microprocessor is
locked up.
Room temperature display has
been reconfigured.
Thermostat is configured for °F
or °C display
Bad thermostat location. Relocate the thermostat.
The upper or lower temperature
limits were reached.
The setpoint temperature range
stops were configured.
a
.
• Check that C terminal is connected to the system
transformer.
• Check for 24 Vac between C and R terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the power switch on the HVAC equipment
is in the Off position—set to the On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Remove the thermostat from the wallplate for 2 minutes. After
2 minutes, replace the thermostat on the wallplate.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (4.5 to 32°C)
• Cooling limits are 48 to 99°F (7 to 35°C).
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
(Continued)
69-1052—1
8
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Troubleshooting Guide
(Continued).
Symptom Possible Cause Action
Heating will not
come on.
Cooling will not
come on.
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
System on indicator
is not displayed,
but heating or
cooling system is
operating
Outdoor
temperature
not displayed
Outdoor
temperature
display is incorrect
a
Available on select models.
No power to the thermostat. • Check that C terminal is connected to the system
Thermostat minimum off time
is activated.
System selection is not set to
Heat.
No power to the thermostat. • Check that C terminal is connected to the system
Thermostat minimum off time is
activated.
System selection is not set to
Cool.
Heating equipment is not
operating.
transformer.
• Check for 24 Vac between C and R and between R and Y1
terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the system switch at the equipment is in
the Off position—set to On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
transformer.
• Check for 24 Vac between C and R and between R and Y1
terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the system switch at the equipment is in
the Off position—set to the On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off
time (if required).
Set system selection to Cool.
Verify operation of heating equipment in self-test.
Option not activated. Enter Installer Setup number 36 and reconfigure to 00.
Option not activated. Enter Installer Setup number 24 and set to 01. Thermostat
a
Outdoor sensor is connected
incorrectly.
a
Wrong sensor. Replace sensor with C7089B1000 sensor.
must have OT terminals and a C7089B1000 installed.
Refer to C7089B1000 installation instructions and check wiring
between the thermostat and sensor.
9
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
69-1052—1
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T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
11
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Honeywell Trol-A-Temp
Helping You Control Your World
57 Bushes Lane
Elmwood Park, NJ 07407-3204
(201) 794-8004
(800) 828-8367
Fax: (201) 794-1359
69-1052—1 J.H. Rev. 6-97 Printed in Taiwan R.O.C. www.honeywell.com/yourhome
69-1052—1
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