Honeywell T8095A, 191108AC User Manual
T8095A/191108AJ/Q682B
M3375
Heating, Cooling and Heating/Cooling
Thermostat, Wallplate, and Subbase;
TS8095A/191108AC Heating-Only
Thermostat and Wallplate
Installation Instructions for the Trained Service Technician.
Preparation
NOTE: Order Q682B Subbase separately.
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.
TABLE 1—SYSTEM COMPATIBILITY.
Type of Heating System
to be Controlled Conditions/Compatibility
Electric (Line Voltage)—
typical baseboard and radiant
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)
Heat Pump • Compatible. Assure correct subbase identity is selected for fan control and
Hot Water Zone • Honeywell 2-wire valves are compatible.
Oil • If not using battery backup, assure that the 24V control transformer common is
Vent Damper • Honeywell damper motors are compatible.
Warm Air Zone • Most are compatible.
a
If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermostat 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.
•The R8239D1015 Isolating Relay or R841 Silent Switching Center must be
installed in the thermostat control circuit.
•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.
changeover control (O terminal for cool and B terminal for heat).
• Some non-Honeywell 2-wire valves require an R8239D1015 Isolating Relay in
the thermostat control circuit.
• Some 3-wire valves require an R8239A1052 Isolating Relay in the thermostat
control circuit.
accessible for connection to thermostat cable conductor and power to transformer
is not regularly interrupted by high temperature, purge cycle, or limit operation.
• Some non-Honeywell damper motors require an R8239D1015 Isolating Relay in
the thermostat control circuit.a Check control amperage requirement.
a, b
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 instructions 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 1-800468-1502.
a
a
Recycling Notice
D.F. • Rev. 11-94 • • ©Honeywell Inc. 1994 • Form Number 69-0638—1
1 69-0638—1
M3375
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could cause a hazardous condition.
2. Installer must be a trained experienced service technician.
3. After installation is complete, check out product op-
eration as provided in these instructions.
IMPORTANT: An incorrectly leveled subbase will cause
the temperature control to deviate from setpoint. It is
not a calibration problem.
CAUTION
1. Disconnect power supply to prevent electrical
shock or equipment damage.
2. To prevent interference with the thermostat
linkage, keep wire length to a minimum and run
wires as close as possible to the subbase.
3. Do not overtighten thermostat captive mounting screws because damage to subbase threads
can result.
4. Do not short across coil terminals on relay. This
can burn out the thermostat heat anticipator.
LOCATION
Locate thermostat about 5 ft [1.5m] above the floor in an
area with good air circulation at average temperature.
Do not mount the thermostat where it may 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.
Run wires from the heating, cooling or heating/cooling
equipment to the new thermostat location.
Refer to the Typical Wiring Diagrams section to deter-
mine the number of wires required for your application.
UNPACK THERMOSTAT
Handle your new thermostat carefully; rough handling
may interfere with its accuracy. Before unpacking, refer to
Fig. 1.
Remove and discard the shipping wrap.
IMPORTANT: Save package of screws and instructions
for the homeowner.
Remove the thermostat cover by lifting from the bottom.
Set aside cover until needed later.
Carefully remove the material protecting the mercury
switch bulb.
Loosen two captive mounting screws and separate wallplate (if provided) from the back of the thermostat base.
MOUNT WALLPLATE OR SUBBASE
Wall Mounting (Fig. 2)
Hold wallplate or subbase in position on the wall (Fig. 2).
Mark holes on the wall for anchors. Use spirit level to
make sure the wallplate or subbase is level.
Drill 3/16-in. holes, and gently tap anchors into holes
until flush with the wall.
Fig. 1—Unpack thermostat.
THERMOSTAT
COVER
80
70
60
12
9
50
3
6
THERMOSTAT
BASE
CAPTIVE
MOUNTING
SCREWS
LIFT
COVER
M1518
Pull wires through the large wiring hole in the wallplate or
subbase.
Loosely fasten the wallplate or subbase to the wall with
the three screws. Do not completely tighten the screws.
Carefully level the wallplate or subbase (Fig. 3), and
firmly tighten the screws.
Fig. 2—Mounting wallplate or subbase to wall.
3 SCREW HOLES
WITH PLASTIC
ANCHORS
O
B
R
W
G
Y
AUTO OFF
HEATON
COOL
M1552A
M1815
HEATING/COOLING SUBBASE
3 SCREW HOLES
WITH PLASTIC
ANCHORS
WALLPLATE
FAN
69-0638—1 2
Fig. 3—Leveling methods for wallplate or
subbase.
or heating/cooling equipment manufacturer. If not available, refer to the Typical Wiring Diagrams section at the end
of this publication.
WIRE WALLPLATE OR SUBBASE
SPIRIT LEVEL
nections to prevent electrical shock or equipment damage.
NOTE: All wiring must comply with local electrical codes
PLUMB
LINE
PLUMB
BOB OR
WEIGHT
FAN
O
B
R
W
G
Y
AUTO OFF
HEATON
former with battery backup. Refer to Figs. 15 and 16 for
hookup diagrams of typical powering applications.
Wallplate (Heating or Cooling Systems)
COOL
M1555
necessary.
(if applicable) terminals. See Fig. 17. For cooling-only systems, connect wires R, Y, and C (if applicable) terminals.
Outlet Box Mounting (Fig. 4)
Firmly tighten the screws.
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). Follow 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.
Carefully level the wallplate or subbase (Fig. 3), and
firmly tighten the screws.
Fig. 4—Mounting wallplate or subbase on horizontal outlet box.
or nonflammable insulation to prevent drafts from affecting
thermostat operation.
Subbase (Heating/Cooling Systems)
necessary.
Follow the instructions provided by the heating, cooling,
Disconnect the power supply before making wiring con-
and ordinances.
This thermostat clock can be powered by a 24-Vac trans-
Refer to Fig. 5 and strip the thermostat wire insulation as
For heating-only systems, connect wires to R, W, and C
Push excess wire back into the wall.
Plug the hole in the wall with nonhardening caulk, putty,
Refer to Fig. 5 and strip the thermostat wire insulation as
EXISTING
HORIZONTAL
OUTLET BOX
FAN
O
B
R
W
G
Y
AUTO OFF
HEATON
HEATING/
COOLING
SUBBASE
COOL
M1553A
VERTICAL
OUTLET
BOX
NOT INCLUDED WITH UNIT.
1
ACCESSORY PARTS AVAILABLE.
2
EXISTING
HORIZONTAL
OUTLET BOX
R
W
WALLPLATE
M1816
1
2
SUBBASE OR
WALLPLATE
ADAPTER
RING
MOUNTING
SCREWS (2)
COVER
PLATE
2
R
G
O
B
W
Y
M1554A
3 69-0638—1
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