T8095A/191108AJ/Q682B
Heating, Cooling and Heating/Cooling
Thermostat, Wallplate, and Subbase;
TS8095A/191108AC Heating-Only
Thermostat and Wallplate
Installation Instructions for the Trained Service Technician.
NOTE: Order Q682B Subbase separately.
Preparation
Check thermostat and subbase (if used) suitability for the
heating, cooling, or heating/cooling system. Refer to Table 1.
Assemble tools required: flat bladed screwdriver, hand or
power drill with 3/16-in. drill bit, wire cutter/stripper or
sharp knife, bubble level or plumb bob and line.
Assure power is off to the heating, cooling, or heating/
cooling system at the main fuse panel. Most buildings have
a separate switch box or circuit breaker for disconnecting
power to the heating and cooling (if applicable) equipment.
This thermostat is compatible with most heating, cooling
or heating/cooling systems. Refer to Table 1 for thermostat
and system compatibility information.
Recycling Notice
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
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 in-
structions regarding recycling and the proper disposal of this
control, or of an old control containing mercury in a sealed
tube.
If you have questions, call Honeywell Inc. at 1-800-
468-1502.
TABLE 1—SYSTEM COMPATIBILITY.
Type of Heating System
to be Controlled
Conditions/Compatibility
Electric (Line Voltage)—
typical baseboard and radiant
• The R8239D1015 Isolating Relay or R841 Silent Switching Center must be
installed in the thermostat control circuit.a
Fan Coil Unit
• Compatible. Assure correct subbase identity is selected for fan control.
Gas—Direct Spark Ignition
(DSI), Intermittent Pilot (IP),
and Standing Pilot (SP)
• Compatible. If not using battery backup, assure that 24V control transformer
common is accessible for connection to thermostat cable conductor and power to
the transformer is not regularly interrupted by high temperature or limit operation.
Heat Pump
• Compatible. Assure correct subbase identity is selected for fan control and
changeover control (O terminal for cool and B terminal for heat).
Hot Water Zone
• Honeywell 2-wire valves are compatible.
• Some non-Honeywell 2-wire valves require an R8239D1015 Isolating Relay in
the thermostat control circuit.a
• Some 3-wire valves require an R8239A1052 Isolating Relay in the thermostat
control circuit.a, b
Oil
• If not using battery backup, assure that the 24V control transformer common is
accessible for connection to thermostat cable conductor and power to transformer
is not regularly interrupted by high temperature, purge cycle, or limit operation.
Vent Damper
Warm Air Zone
• Honeywell damper motors are compatible.
• Some non-Honeywell damper motors require an R8239D1015 Isolating Relay in
the thermostat control circuit.a Check control amperage requirement.
• Most are compatible.
a If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermo-
stat will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell
R841 or R8239D1015 Isolating Relay must be added to the thermostat control circuit.
b Consult manufacturer for installation requirements.
• ©Honeywell Inc. 1994 • Form Number 69-0638—1
D.F. • Rev. 11-94 •
M
WIRE WALLPLATE OR SUBBASE
Fig. 3—Leveling methods for wallplate or
subbase.
Follow the instructions provided by the heating, cooling,
or heating/cooling equipment manufacturer. If not avail-
able, refer to the Typical Wiring Diagrams section at the end
of this publication.
Disconnect the power supply before making wiring con-
nections to prevent electrical shock or equipment damage.
SPIRIT LEVEL
NOTE: All wiring must comply with local electrical codes
and ordinances.
PLUMB
LINE
O
This thermostat clock can be powered by a 24-Vac trans-
former with battery backup. Refer to Figs. 15 and 16 for
hookup diagrams of typical powering applications.
B
R
G
W
Y
Wallplate (Heating or Cooling Systems)
Refer to Fig. 5 and strip the thermostat wire insulation as
necessary.
PLUMB
BOB OR
WEIGHT
FAN
COOL
ON
AUTO
HEAT
OFF
M1555
For heating-only systems, connect wires to R, W, and C
(if applicable) terminals. See Fig. 17. For cooling-only sys-
tems, connect wires R, Y, and C (if applicable) terminals.
Firmly tighten the screws.
Outlet Box Mounting (Fig. 4)
Push excess wire back into the wall.
Use a horizontally mounted outlet box if possible. If a
vertical outlet box is used, mount the wallplate or subbase on
a 193121A Cover Plate Assembly (ordered separately). Fol-
low the instructions provided with the cover plate assembly.
Align the wallplate or subbase mounting holes on the
outlet box and loosely fasten with two screws.
Plug the hole in the wall with nonhardening caulk, putty,
or nonflammable insulation to prevent drafts from affecting
thermostat operation.
Subbase (Heating/Cooling Systems)
Refer to Fig. 5 and strip the thermostat wire insulation as
necessary.
Carefully level the wallplate or subbase (Fig. 3), and
firmly tighten the screws.
Fig. 4—Mounting wallplate or subbase on horizontal outlet box.
EXISTING
EXISTING
HORIZONTAL
OUTLET BOX
HORIZONTAL
OUTLET BOX
O
R
B
R
W
W
HEATING/
COOLING
SUBBASE
G
WALLPLATE
Y
FAN
COOL
ON
AUTO
HEAT
OFF
M1816
M1553A
VERTICAL
OUTLET
1
BOX
2
COVER
PLATE
ADAPTER
RING
2
R
G
SUBBASE OR
WALLPLATE
MOUNTING
SCREWS (2)
1
2
NOT INCLUDED WITH UNIT.
M1554A
ACCESSORY PARTS AVAILABLE.
3
69-0638—1
Connect the wires to the corresponding terminals on the
subbase(orderedseparately). Iflabelsdonotagreewithyour
newsubbase, refertoTable2andtheinstallationinstructions
furnished with the subbase.
Hang the thermostat base on the wallplate or subbase.
Insert the two captive mounting screws located in the bot-
tom corners of the base (Fig. 6).
Firmly tighten the screws.
NOTE: If wiring a dual transformer system, only the O or
the B terminal may be used.
INSERT CLOCK BATTERIES
Power is supplied to the clock by the 24-Vac transformer.
Backup batteries (not included) may be installed to supply
power to the clock if power is interrupted.
Push excess wire back into the wall.
Plug the hole in wall with nonhardening caulk, putty, or
nonflammable insulation to prevent drafts from affecting
thermostat operation.
Install the batteries in the thermostat (Fig. 7).
Once a year or when batteries are dead, replace with two
new AAA alkaline batteries. Properly dispose of old batter-
ies. We recommend Energizer® batteries.
Fig. 5—Methods of connecting terminals.
Fig. 6—Thermostat mounting.
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND
BARRIER
CONNECTION—
STRIP 7/16 in. [11 mm]
TAB (2)
MOUNTING SLOT (2)
M1556B
1
TABLE 2—TERMINAL DESIGNATIONS.
Subbase
Terminal
Control
Function
35
30
25
20
10
R
Control transformer power.
R
Line side of 24V power supply;
cooling side, 2 transformer heat-cool
system.
c
CAPTIVE
MOUNTING SCREWS
R
Line side of 24V power supply;
heating side, 2 transformer heat-cool
system.
THERMOSTAT
BASE
WALLPLATE
OR SUBBASE
h
M8584
W
Y
Heating control circuit.
Fig. 7—Insert clock batteries.
Cooling control circuit; jumper to W
for heat pump compressor control if
no P terminal on subbase.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
G
C
O
Fan control circuit.
Clock control (transformer common).
Cooling damper or changeover/
reversing valve, makes continuously
in cool.
B
P
Heating damper or changeover/
reversing valve, makes continuously
in heat.
Heat pump contactor; P terminal on
some models only.
M7188
MOUNT THE THERMOSTAT
Note the tabs on the top inside edge of the thermostat
base. These tabs fit the slots molded into the top of the wall-
plate or subbase.
69-0638—1
4
SET HEAT ANTICIPATOR
Fig. 8—Set clock.
Adjust the heat anticipator lever to match the current
ratingoftheprimarycontrolforthepropercyclerate(Fig. 9).
Adjustable anticipation must be set for total current of
heat and fan control.
PROGRAM DIAL
The current rating is usually stamped on the control or
valve (Fig. 10), or a setting may be given in the device
instructions.
MINUTE
HAND
If no current rating or heat anticipator setting is given,
measure the current with an ammeter. Proceed with the fol-
lowing steps.
Remove the thermostat from the wallplate or subbase.
Connect an ac ammeter of appropriate range (about 0A to
2A) between the R and W terminals on the wallplate or sub-
base except for electric heat and heat pump systems.
Let the system operate for one minute.
TIME
INDICATOR
ARROW
Adjust the heat anticipator lever to match the number that
reads on the ammeter.
M1813A
ATTACH THERMOSTAT COVER
Make sure the packing inserts in the thermostat base are
removed.
Place the two tabs on the upper edge of the cover into the
mounting slots in the thermostat base (Fig. 11).
Swing the cover downward until it catches at the bottom
of the base.
SET CLOCK
Adjust the clock by moving the minute hand in a clock-
wise
direction. Do not reverse the minute hand.
When time is correctly set, the time indicator arrow (tri-
angle shape) points to the correct time and the corresponding
daytime(light)ornighttime(dark)portionoftheprogramdial.
Fig. 11—Attach cover.
Fig. 9—Adjust heat anticipator.
12
9
3
50
60
70
80
6
ANTICIPATOR
SCALEPLATE
M1519
ANTICIPATOR
SETTING LEVER
M7317
Fig. 10—Current rating of primary control.
OIL BURNER CONTROL
SHOWS
CURRENT
DRAW
SHOWS
VOLTAGE
RATING
SHOWS LOW
VOLTAGE
30 VAC
V8043E 1004 4
0.2 AMP
24V 50/60CY
.32 AMP @ 60CY
SHOWS
ANTICIPATOR
SETTING
SHOWS
VOLTAGE
RATING
T
T
TO
BURNER
F
F
24 Vac 50/60 Hz
0.4 AMP
FROM MAIN
SHOWS
FUEL SUPPLY
ANTICIPATOR
SETTING
ZONE VALVE
M6116A
TYPICAL GAS VALVE
5
69-0638—1
SET TEMPERATURE CONTROL LEVERS
The two levers on top of the thermostat control the low
and high temperatures for energy savings and comfort con-
trol (Fig. 12). The lever on the left (blue mark) controls the
lower temperature. The lever on the right (red mark) controls
the higher temperature.
Operate the entire heating system at least one complete
cycle.
If thermostat fails any test, refer to the Troubleshooting
Guide in the Owner’s Manual.
Reset both the temperature setting levers to the desired
temperatures.
We recommend pushing the levers together at an appro-
priate temperature for either heat or cool until the occupant
programs the thermostat and makes the final temperature
selections.
COOLING-ONLY SYSTEM (T8095A ONLY)
Turn on power to the cooling equipment.
Push both temperature setting levers together at least 5° F
[3° C] below the room temperature. The cooling equipment
will operate, and the fan will start. Allow for any time delay
that may be built into the compressor control circuit.
Fig. 12—Temperature control levers.
LOW TEMPERATURE
(BLUE MARK)
SET LEVER
HIGH TEMPERATURE
(RED MARK)
SET LEVER
NOTE: To avoid compressor damage, do not operate the
system when outdoor temperature is below 50°F [10°C].
Refer to manufacturer recommendations.
Move both levers 5° F [3° C] above room temperature.
The cooling equipment and the fan should shut off.
Operate the entire cooling system at least one complete
cycle.
70
60
80
50
If thermostat fails any test, refer to the Troubleshooting
Guide in the Owner’s Manual.
M859
Reset both the temperature setting levers to the desired
temperatures.
SET SUBBASE SWITCHES (IF APPLICABLE)
The subbase system switch controls system operation as
follows:
HEAT: Heating system is controlled by the thermostat.
Cooling system is off.
HEATING/COOLING SYSTEM
Turn on power to the furnace and cooling system.
Place the system switch lever to HEAT and fan switch
lever to AUTO.
Push both temperature setting levers together at least 5° F
[3° C] above room temperature. The main burner should
come on. The fan will start when the furnace heats up. (If
central electric heat, fan coil or heat pump system, fan starts
immediately.)
Move both levers 5° F [3° C] below room temperature.
The burner should shut off.
PlacethesystemswitchlevertoCOOLandthefanswitch
lever to AUTO. The cooling equipment will operate, and the
fan will start. Allow for any time delay that may be built into
the compressor control circuit.
COOL: Cooling system is controlled by the thermostat.
Heating system is off.
OFF: Both the heating and cooling systems are off. If the
fan switch is in the AUTO position, the fan is also off.
The subbase fan switch controls fan operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates with the cooling equipment as con-
trolled by the thermostat or with the heating equip-
ment as controlled by the plenum switch. In electric
heat, heat pump and fan coil systems, the fan is con-
trolled by the thermostat in heating and cooling.
To switch positions, use thumb or index finger to slide
lever to the desired position. For proper circuit operation,
switch lever must stop in detent over the desired function
indicator mark.
NOTE: To avoid compressor damage, do not operate the
system when outdoor temperature is below 50°F [10°C].
Refer to manufacturer recommendations.
Move both temperature setting levers together at least 5° F
[3° C] above the room temperature. The cooling equipment
should shut off.
Place the fan switch to ON. The fan should run continu-
ously with the system switch in any position.
Place the system switch to OFF. Move both temperature
setting levers to various positions. The heating and cooling
systems should not operate.
Operate the entire system for at least one complete cycle
with the system switch at COOL and one complete cycle
with the switch at HEAT.
If thermostat fails any test, refer to the Troubleshooting
Guide in the Owner’s Manual.
Checkout
CAUTION
Do not check operation by shorting across termi-
nals of system controls. This will damage the heat
anticipator.
HEATING-ONLY SYSTEM
Turn on power to the furnace.
Push both temperature setting levers together at least 5° F
[3° C] above the room temperature. The main burner should
come on. The fan will start when the furnace heats up.
Move both levers 5° F [3° C] below the room tempera-
ture. The burner should shut off.
Reset both the temperature setting levers to the desired
temperatures.
Leave Owner’s Manual and Assistance Information in a
convenient place for the building occupant or provide with
other appliance manuals.
69-0638—1
6
To check thermostat calibration, allow several hours of
operation after installation. Then read thermometer and re-
move cover. Push temperature levers together to a setting
below room temperature. Slowly move them up the scale
together until the mercury slides across the tube. If the
thermometer reading and the high temperature lever posi-
tion are approximately the same at the instant the mercury
moves to the other end, no recalibration is needed.
If calibration is necessary, proceed as follows:
Calibration
NOTE: Select models can be calibrated.
THERMOMETER
The thermometer in your thermostat was accurately cali-
brated at the factory. The thermometer should need adjust-
ment only if it has been dropped or shifted due to mishandling.
If the setpoint lever and the thermometer reading do not
agree:
1. Remove the thermostat cover by pulling up from the
bottom of cover until it clears the mounting slots.
2. Set the thermostat cover on a table near an accurate
thermometer.
3. Allow five minutes for cover thermometer to sense
area temperature; compare the readings. Be careful not to
touch thermometer or breathe on it.
4. If the readings are the same, replace cover and put the
system into operation.
1. Remove the cover.
2. Place open-end calibration wrench, part no. 104994A
(ordered separately), on the hex nut under the bimetallic coil
controlled by the red lever (Fig. 14). Hold lever so it does not
move, and gently turn the wrench clockwise
mercury rests securely in the right end of the tube.
until the
3. Put the thermostat cover on and wait 10 minutes.
4. Read the thermometer. Then remove the cover. Mov-
ing both levers, place the HIGH lever at the thermometer
reading. Hold lever so it does not move, and gently turn the
wrench counterclockwise
until the mercury just slides
5. If the readings are different, insert a small screwdriver
in the thermometer and turn it until the thermometers have
the same reading (Fig. 13).
6. Replace thermostat cover and put the system into
operation.
to the left end of the tube but no farther. Try to do this quickly
so the heat from your hands does not affect the thermostat.
5. Repeat this procedure for the blue lever.
Fig. 14—Use of 104994A calibration wrench.
NOTE: Radiant heat from your hands will offset the ther-
mometer reading. After making each adjustment, wait 5
or 10 minutes for the thermometer to stabilize before
comparing.
CALIBRATION
WRENCH
Fig. 13—Thermometer calibration.
ANTICIPATOR
SETTING
LEVER
.35
.30
ANTICIPATOR
SCALEPLATE
.20
.10
INCREASE
M8583
Typical Wiring Diagrams
The clock for the T8095 and TS8095 must be powered by
a 24V transformer for the T8095. A separate transformer
may be connected (Fig. 15), or the system transformer may
be connected (Fig. 16).
M5128
THERMOSTAT
This thermostat was calibrated at the factory and should
not need recalibration in the field. If recalibration seems
necessary, first be sure wallplate or subbase is accurately
leveled. Then check thermometer calibration.
7
69-0638—1
Fig. 15—Typical hookup for clock powered by
separate 24-Vac transformer.
Fig. 16—Typical hookup for clock powered by
system transformer. Clock powered by battery
when system is not powered (e.g., power to
system is off or interrupted).
CLOCK
2
BATTERY
THERMOSTAT
CLOCK
BATTERY
THERMOSTAT
SUBBASE
C
R
C
W
L1
(HOT)
SUBBASE
1
C
R
C
W
L2
HEAT
RELAY
L1
(HOT)
HEAT
RELAY
1
L1
(HOT)
L2
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M1513A
1
BATTERY BACKUP MAY BE USED IF POWER TO
CLOCK IS INTERRUPTED.
M1512B
Fig. 17—Internal schematic and typical hookup for TS8095A Thermostat/191108AC Wallplate in heating-
only system.
CLOCK
FALL
FALL
THERMOSTAT
BIMETAL
FIXED
ANTICIPATOR
BIMETAL
FIXED
ANTICIPATOR
WALLPLATE
C
R
C
W
750 mV
SYSTEM
L1
(HOT)
1
L2
M1808A
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Honeywell Limited—Honeywell Limitée
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario M1V 4Z9
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