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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
Requires common wire to Automatic or Em Heat-Heat-Off-
power supply Manual Cool-Auto
Changeover System Selection Fan Selection
T8511G Zone 1 on MABS II or
TotalZone® system
On-Auto
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.
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old 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.
INSTALLATION
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.
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.
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
•
All Rights Reserved
69-1052-1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
OUTDOOR
TEMPERATURE
SENSOR
Mounting Thermostat
1. Engage tabs at the top of the thermostat and
wallplate. See Fig. 6.
THERMOSTAT
2. Press lower edge of case to close and latch.
O
G
B
L
C
R
Y
E
W2 OT OT
NOTE: To remove the thermostat from the wall, first pull out
at the bottom of the thermostat; remove top last.
ZONE 1
T8
T7
T6
T5
T4
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
O1
G1
B1
E1
CHANGEOVER
CONTROL
M1
M12188
B. PRESS LOWER EDGE OF CASE TO LATCH.
Fig. 3. Typical wiring diagram for T8511G with zone 1
MABS II control panel.
OUTDOOR
TEMPERATURE
SENSOR
(OPTIONAL)
THERMOSTAT
1
B
E
L
L
G
G
Y
R
O
W2
C
OT OT
M6798A
Fig. 6. Mounting thermostat on wallplate.
W2
Y
R
W
M6 M4 M1
TotalZone® PANEL THERMOSTAT CONNECTIONS
Using Thermostat Keys
The thermostat keys are used to:
1
WHEN USING W2 ON THE THERMOSTAT TO CONTROL THE SECOND
STAGE OF HEATING, BE SURE THE STAGE JUMPER IS IN PLACE ON
THE TZ PANEL.
•
•
•
•
•
•
•
set temperature,
M12189
display present setting,
configure Installer Setup,
check System-Test,
display outdoor temperature (select models),
set the system operation,
set the fan operation.
Fig. 4. Typical wiring diagram for T8511G with zone 1
TotalZone® control panel.
See Fig. 7 for the location of the keys.
INCREASE
TEMPERATURE
SETTING
DECREASE
TEMPERATURE
SETTING
i
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
M6801
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
Fig. 7. Key locations and descriptions.
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
M4826
Fig. 5. Proper wiring technique.
3
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
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.
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.
A combination of key presses are required to use the
Installer Setup feature.
—
To enter the Installer Setup, press and hold the
Information key with the increase ▲ and decrease
i
▼ 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.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
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
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.
(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
Outdoor
i
System
System
Fan
Press to select
heating or cooling
equipment.
Press to select
heating or cooling
equipment.
Repl
Em. Ht.-Emergency heating
Heat—Heating equipment
On— Fan runs continuously
Auto—Fan runs when
heating or cooling
System
Fan
Off
—
No equipment
Cool—Cooling equipment
Auto—Thermostat
automatically selects
heating and cooling
equipment.
equipment operates
Wait
Heat Cool
Batt
Fan
System
Fan
Em HeatOffCool Auto Only OnAuto
1
M4844
Fig. 9. Display of all the segments of the LCD.
INSTALLER SETUP
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
M10147
CHECK LIGHT ON SELECT MODELS
1
Fig. 8. Thermostat System and Fan key location.
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
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.
M10105A
Fig. 10. Display of Installer Setup number and setting.
INSTALLER SETUP
IMPORTANT
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.
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.
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T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Table 2. Thermostat Installer Setup Options.
Installer Setup
Number
Other Choices
Factory Setting
(Press ▲ or ▼ key to change)
(Press
i
key
Actual
Setting
to change)
Select
Not used
Display
Description
Display
Description
01 thru 04
—
06
—
06
—
—
—
—
—
05
06
07
Stage 2
Heating cycle
rate
03, 06 03—3 cph used for hot water
or 09
systems
Not used
Emergency heat
06—6 cph used for heat pump
systems
09—9 cph used for electric heat
systems
Not used
08 thru 11
12
—
—
—
—
—
—
—
Changeover
01
Manual changeover
00 or 00—Automatic changeover
02
—
01
02—Auto only
Not used
13
14
—
—
—
Degree tempera-
ture display
00
Temperature is
displayed in °F
Temperature is displayed
in °C
Not used
15 thru 18
19
—
—
—
—
Extended fan
operation in
heating
00
No extended fan
operation after the
call for heat ends
01
Fan operation is extended
90 seconds after the call for
heat ends
Extended fan
operation in
cooling
20
00
No extended fan
operation after the
call for cool ends
01
Fan operation is extended
90 seconds after the call for
cool ends
Not used
21 thru 23
24
—
—
—
—
—
—
Outdoor
00
No outdoor
temperature is
displayed
01
Outdoor temperature is
displayed. Needs a C7089B1000
Outdoor Sensor to operate.
temperature
a
display
Not used
25 thru 32
33
—
—
—
—
Minimum off time
for the
compressor
05
5 minute minimum off 00, 01, Minimum number of minutes
time for the
compressor
02, 03 (0 thru 5) the compressor will be
or 04
off between calls for the
compressor
Heating setpoint
range stop
34
35
36
90
48
00
Heating setpoint can 40 thru Number can be set anywhere
a
be set no higher than 90
90°F
between 40 and 90 in 1°F
increments
Cooling setpoint
Cooling setpoint can 48 thru Number can be set anywhere
a
range stop
be set no lower than 99
48°F
between 48 and 99 in 1°F
increments
System on
indicator
LCD On symbol is
displayed when
01
Display is disabled
(flame=heat,
snowflake=cool)
is displayed
system is energized
a
Temperature
display
adjustment
37
00
No difference in
displayed
temperature and
actual room
-3 thru 01—Display adjusts to 1°F higher
03
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
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
a Available on select models.
5
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
IMPORTANT
Em Ht Temporary Setting
Aux Ht
Remote
Room
%Humid
Outdoor
Review the settings to confirm that they match
the system. To exit the Installer Setup, press and
hold the Information
i
key until the display
returns to normal (approximately three seconds).
Repl
Wait
Heat Cool
Batt
System
Fan
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.
Em HeatOffCool Auto Only OnAuto
M4844
Fig. 11. Display of all the segments of the LCD.
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.
M6792
TEST MODE NUMBER
Table 3. Tests Available In the Installer System-Test.
Test
Fig. 12. Display of test number.
Refer to Table 4 for the directions and results of the
specific tests.
Number
System-Test Description
10-19
Heating equipment can be turned on
and off
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.
20-29
30-39
Emergency heat (select models)
equipment can be turned on and off
Cooling equipment can be turned on
and off
40-49
60-69
70-79
Fan equipment can be turned on and off
Keyboard keys test
Thermostat information including date
code and software versions are displayed
Table 4. Installer System-Test Options.
Key to
Press
Test
Number
Description
Heating Equipment System-Test
i
10
11
12
11
10
Enter heating equipment system-test.
▲
▲
▼
▼
Stage-one heat comes on. System fan is also energized.
Stage-two heat comes on. Stage-one heat and system fan remain on.
Stage-two heat turns off.
Stage-one heat and system fan turn off.
Emergency Heating Equipment System-Test (select models)
i
20
21
20
Changing from heating to emergency heating equipment system-test.
Emergency heat comes on. System fan also comes on.
Emergency heat turns off.
▲
▼
Cooling Equipment System-Test
i
30
31
30
Change from heating or emergency heating to cooling equipment system-test.
Cool and system fan come on.
▲
▼
Cool and system fan turn off.
(Continued)
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T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Table 4. Installer System-Test Options (Continued).
Description
Key to
Press
Test
Number
Fan Equipment System-Test
i
40
41
40
Change from cooling to fan equipment system-test.
▲
▼
Fan comes on.
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
i
60
61
62
63
64
65
Change from cooling or fan to key operation system-test.
Heat Test Number is displayed.
System
System
System
System
System
Off Test Number is displayed.
Cool Test Number is displayed.
Auto Test Number is displayed.
Emergency heat Test Number is displayed.
Fan Key System-Test
Fan
Fan
68
69
Fan on Test Number is displayed.
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.
3. Press the increase ▲ key again to display the
THERMOSTAT INFORMATION
software identification code.
1. Press the Information
i
key to access the thermo-
stat information.
M4866
4. Press the increase ▲ key again to display the
M4864
software revision number (Example: 001=Revision
number 1).
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 (Ex-
ample: 027=February 1997).
M6791
M10444
7
69-1052—1
T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
5. Press the increase ▲ key again to display the
CHECKOUT
EEPROM identification code.
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.
M4867
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.
TROUBLESHOOTING GUIDE
Symptom
Possible Cause
Action
Display will not
come on.
Thermostat is not being
powered.
•
•
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.
Thermostat microprocessor is
locked up.
Remove the thermostat from the wallplate for 2 minutes. After
2 minutes, replace the thermostat on the wallplate.
Temperature
Room temperature display has Enter Installer Setup number 37 and reconfigure the display.
display is incorrect. been reconfigured.
Thermostat is configured for °F Enter Installer Setup number 14 and reconfigure the display.
or °C displaya.
Bad thermostat location.
Relocate the thermostat.
The upper or lower temperature Check the temperature setpoints:
Temperature
limits were reached.
•
•
Heating limits are 40 to 90°F (4.5 to 32°C)
Cooling limits are 48 to 99°F (7 to 35°C).
settings will not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)
The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the
stops were configured. setpoint stops.
a Available on select models.
(Continued)
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T8511G DELUXE HEAT PUMP ZONE THERMOSTAT
Troubleshooting Guide (Continued).
Symptom
Possible Cause
Action
Heating will not
come on.
No power to the thermostat.
•
•
Check that C terminal is connected to the system
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.
Thermostat minimum off time
is activated.
Wait up to five minutes for the system to respond.
System selection is not set to
Heat.
Set system selection to Heat.
Cooling will not
come on.
No power to the thermostat.
•
•
Check that C terminal is connected to the system
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.
Thermostat minimum off time is
activated.
•
•
Wait up to five minutes for the system to respond.
Enter Installer Setup number 33. Reconfigure minimum off
time (if required).
System selection is not set to
Cool.
Set system selection to Cool.
System on indicator Heating equipment is not
Verify operation of heating equipment in self-test.
(flame=heat,
operating.
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
System on indicator Option not activated.
is not displayed,
Enter Installer Setup number 36 and reconfigure to 00.
but heating or
cooling system is
operating
Outdoor
Option not activated.
Enter Installer Setup number 24 and set to 01. Thermostat
must have OT terminals and a C7089B1000 installed.
temperature
not displayeda
Outdoor sensor is connected
incorrectly.
Refer to C7089B1000 installation instructions and check wiring
between the thermostat and sensor.
Outdoor
temperature
display is incorrecta
Wrong sensor.
Replace sensor with C7089B1000 sensor.
a Available on select models.
9
69-1052—1
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69-1052—1
Helping You Control Your World®
Honeywell Trol-A-Temp
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.
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