T8190A/191108AJ Heating or Cooling
Thermostat/Wallplate; T8190A/Q682B
Heating/Cooling Thermostat/Sub base
Installation Instructions for the Trained Service Technician.
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 all heating, cooling or
heating/cooling systems when thermostat is powered by
batteries. If thermostat is not powered by batteries, refer to
Table 1 for thermostat and system compatibility information.
TABLE 1—SYSTEM COMPATIBILITY FOR NON-BATTERY POWERED THERMOSTATS.
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
Gas—Direct Spark Ignition (DSI),
Intermittent Pilot (IP), and Standing
Pilot (SP)
Heat Pump • Compatible. Assure correct subbase identity is selected for
Hot Water Zone • Honeywell 2-wire valves are compatible.
Oil • If not using battery backup, assure that the 24V control transformer
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.
control.
• 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.
fan control and 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.
common is accessible for connection to thermostat cable conductor
and power to the 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.
NOTE: Order Q682B Subbase separately.
Recycling Notice
M3375
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
a, b
D.F. • Rev. 12-94 • • ©Honeywell Inc. 1994 • Form Number 69-0642—1
1 69-0642—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.
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 back of thermostat base.
Fig. 1—Unpack thermostat.
CAPTIVE MOUNTING
LIFT
COVER
SCREWS
2
3
4
5
6
7
8
9
10
11
12
1
12
11
10
9
8
7
6
35
30
25
20
10
THERMOSTAT
COVER
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.
Fig. 2—Mounting wallplate or subbase to wall.
3 SCREW HOLES
WITH PLASTIC
ANCHORS
THERMOSTAT BASE
REMOVE
PACKING
MATERIAL
M8673
MOUNT WALLPLATE OR SUBBASE
Wall Mounting (Fig. 2)
Hold the wallplate or subbase in position on 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.
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.
3 SCREW HOLES
WITH PLASTIC
ANCHORS
O
B
R
W
G
Y
FAN
AUTO OFF
HEATING/COOLING SUBBASE
COOL
HEATON
M1552A
69-0642—1 2
WALLPLATE
M1815
Outlet Box Mounting (Fig. 4)
Fig. 3—Leveling methods for wallplate or
subbase.
Use a horizontally mounted outlet box if possible. If a
vertical outlet box is used, mount the wallplate or subbase on
a 193121A (beige) Cover Plate Assembly (ordered separately). Follow the instructions provided with the cover
SPIRIT LEVEL
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
PLUMB
LINE
PLUMB
BOB OR
WEIGHT
FAN
O
B
R
W
G
Y
AUTO OFF
HEATON
COOL
M1555
Fig. 4—Mounting wallplate or subbase on horizontal outlet box.
firmly tighten the screws.
WIRE WALLPLATE OR SUBBASE
Follow the instructions provided by the heating, cooling,
or heating/cooling equipment manufacturer. If not available,
refer to the Typical Wiring Diagrams section at the end of
this publication.
Disconnect the power supply before making wiring connections to prevent electrical shock or equipment damage.
EXISTING
HORIZONTAL
OUTLET BOX
FAN
AUTO OFF
EXISTING
HORIZONTAL
OUTLET BOX
O
B
R
W
G
Y
COOL
HEATON
HEATING/
COOLING
SUBBASE
M1553A
VERTICAL
OUTLET
BOX
1
2
ADAPTER
RING
COVER
PLATE
2
R
G
R
W
WALLPLATE
M1816
O
B
W
Y
SUBBASE OR
WALLPLATE
NOT INCLUDED WITH UNIT.
1
ACCESSORY PARTS AVAILABLE.
2
NOTE: All wiring must comply with local electrical codes
and ordinances.
This thermostat clock can be powered by a 24 Vac transformer with battery backup. Refer to Figs. 15 through 19 for
hookup diagrams of typical powering applications.
MOUNTING
SCREWS (2)
M1554A
For Wallplate (Heating or Cooling Systems)
Refer to Fig. 5 and strip the thermostat wire insulation as
necessary.
For heating-only systems, connect wires to R, W, and C
(if applicable) terminals (Fig. 20). For cooling-only systems,
connect wires R, Y, and C (if applicable) terminals. Firmly
tighten the screws.
3 69-0642—1
Push excess wire back into the wall.
Plug the hole in the wall with nonhardening caulk, putty,
or nonflammable insulation to prevent drafts from affecting
thermostat operation.
Plug the hole in wall with nonhardening caulk, putty, or
nonflammable insulation to prevent drafts from affecting
the thermostat operation.
Subbase (Heating/Cooling Systems)
Fig. 5—Methods of connecting terminals.
Refer to Fig. 5 and strip the thermostat wire insulation as
necessary.
Connect the wires to the corresponding terminals on the
subbase. If labels do not agree with your new subbase, refer
to Table 2 and the installation instructions furnished with
the subbase.
NOTE: If wiring a dual transformer system, only the O or
the B terminal may be used.
Push excess wire back into the wall.
TABLE 2—SUBBASE TERMINAL DESIGNATIONS.
Subbase Terminal Control Function
R Control transformer power.
R
c
R
h
Line side of 24V power supply; cooling side, 2 transformer heat/cool system.
Line side of 24V power supply; heating side, 2 transformer heat/cool system.
W Heating control circuit.
Y Cooling control circuit; jumper to W for heat pump compressor control if no
P terminal on subbase.
G Fan control circuit.
C Clock control (transformer common).
O Cooling damper or changeover/reversing valve, makes continuously in cool.
B Heating damper or changeover/reversing valve, makes continuously in heat.
P Heat pump contactor; P terminal on some models only.
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 in. [11 mm]
BARRIER
M1556B
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
wallplate or subbase.
Hang the thermostat base on the wallplate or subbase.
Insert the two captive mounting screws located in the
bottom corners of the base (Fig. 6).
Firmly tighten the screws.
INSERT TIMER BATTERIES
Power is supplied to the clock by the 24 Vac transformer
or two AAA alkaline batteries (included), or by the heating
or cooling control circuit. Backup batteries may be installed
to supply power to the clock if power is interrupted when
using 24 Vac powering method.
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 batteries. We recommend Energizer® batteries.
Fig. 6—Thermostat mounting.
TAB (2)
MOUNTING SLOT (2)
1
12
2
3
11
4
10
5
9
6
8
7
7
8
6
9
10
11
12
35
30
25
20
10
THERMOSTAT
BASE
WALLPLATE
OR SUBBASE
CAPTIVE
MOUNTING SCREWS
M8674
69-0642—1 4
Fig. 7—Insert timer batteries.
TIMER
SETTING
KNOB
TIME
INDICATOR
ARROW
M821A
PROGRAM DIAL
PROGRAM
PIN (6)
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
M8585
SET TIMER
Adjust the timer by moving the knob clockwise .
Do not reverse the knob.
When time is correctly set, the time indicator arrow
(triangle shape) points to the correct time and the corresponding daytime (light) or nighttime (dark) portion of the
program dial (Fig. 8).
Fig. 8—Set timer.
Let the system operate for one minute.
Adjust the heat anticipator lever to match the number that
reads on the ammeter.
SET HEAT ANTICIPATOR
Adjust the heat anticipator lever to match the current
rating of the primary control for the proper cycle rate (Fig. 9).
Adjustable anticipation must be set for total current of heat
and fan control.
The current rating is usually stamped on the control or
valve (Fig. 10), or a setting may be given in the device
instructions.
If no current rating or heat anticipator setting is given,
measure the current with an ammeter. Proceed with the
following 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
subbase, except for electric heat and heat pump systems.
Fig. 10—Current rating of primary control.
SHOWS
VOLTAGE
RATING
SHOWS
ANTICIPATOR
SETTING
8406
V8043E 1004 4
24V 50/60CY
@ 60CY
.32 AMP
ZONE VALVE
SHOWS
VOLTAGE
RATING
FROM MAIN
FUEL SUPPLY
24 Vac 50/60 Hz
0.4 AMP
TYPICAL GAS VALVE
Fig. 9—Adjust heat anticipator.
ANTICIPATOR
SCALEPLATE
ANTICIPATOR
SETTING LEVER
OIL BURNER CONTROL
SHOWS
CURRENT
DRAW
TO
BURNER
SHOWS
ANTICIPATOR
SETTING
30 VAC
0.2 AMP
M7317
SHOWS LOW
VOLTAGE
T
T
F
F
M6116A
5 69-0642—1
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.
To switch positions, use thumb or index finger to slide
lever to the desired position. Switch lever must stop in detent
over the desired function indicator mark for proper circuit
operation.
Checkout
Fig. 11—Attach cover.
50
60
70
80
M8604
SET TEMPERATURE CONTROL LEVERS
The two levers on the top of the thermostat control the low
and high temperatures for energy savings and comfort control (Fig. 12). The lever on the left (blue mark) controls the
lower temperature. The lever on the right (red mark) controls
the higher temperature.
We recommend pushing the levers together at an appropriate temperature for either heat or cool until the occupant
programs the thermostat and makes the final temperature
selections.
CAUTION
Do not check operation by shorting across the
terminals of the 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.
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 temperature setting levers to the desired
temperatures.
COOLING-ONLY SYSTEM
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
50
60
70
80
HIGH TEMPERATURE
(RED MARK)
SET LEVER
M859
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.
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
controlled 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
controlled by the thermostat in heating and cooling.
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.
If thermostat fails any test, refer to the Troubleshooting
Guide in the Owner’s Manual.
Reset both temperature setting levers to the desired
temperatures.
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.
Place the system switch lever to COOL and the fan switch
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.
69-0642—1 6
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.
Reset both 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.
Fig. 13—Thermometer calibration.
INCREASE
M5128
Calibration
THERMOMETER
The thermometer in your thermostat was accurately calibrated at the factory. The thermometer should need adjustment 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.
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.
NOTE: Radiant heat from your hands will offset the ther-
mometer reading. After making each adjustment, wait five
or ten minutes for the thermometer to stabilize before
comparing.
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.
To check thermostat calibration, allow several hours of
operation after installation. Then read thermometer and
remove 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 position 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:
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 until the
mercury rests securely in the right end of the tube.
3. Put the thermostat cover on and wait ten minutes.
4. Read the thermometer. Then remove the cover. Moving 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
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.
CALIBRATION
WRENCH
ANTICIPATOR
SETTING
LEVER
ANTICIPATOR
SCALEPLATE
.35
.30
.25
.20
.10
M8583
7 69-0642—1
Typical Wiring Diagrams
Fig. 15—Typical hookup for timer powered by
separate 24-Vac transformer.
Fig. 17—Typical hookup for timer powered by
system transformer. Timer powered by battery
when system is not powered (e.g., power to
system is off or interrupted).
TIMER
TIMER
C
R
C
W
HEAT
RELAY
M822A
THERMOSTAT
SUBBASE
1
2
BATTERY
L1
(HOT)
L2
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
2
BATTERY BACKUP MAY BE USED IF POWER TO
TIMER IS INTERRUPTED.
Fig. 16—Typical hookup for timer powered by
two AAA alkaline batteries only.
TIMER
THERMOSTAT
SUBBASE
BATTERY
C
C
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
R
W
HEAT
RELAY
M824A
Fig. 18—Typical hookup for timer powered
through control system. Timer powered by
battery when heating or cooling equipment is
on; timer takes power from system when
heating equipment is off.
THERMOSTAT
TIMER
BATTERY
THERMOSTAT
SUBBASE
BATTERY
C
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
R
C
HEAT
RELAY
3
C C RH RC
W
M823A
SUBBASE
L1
(HOT)
1
L2
L1
(HOT)
1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
2
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON HEATING, JUMPER
3
C-RH AND C-W TERMINALS.
2
WY
HEAT
RELAY
COMPRESSOR
CONTACTOR
M825A
69-0642—1 8
Fig. 19—Typical hookup for timer powered through control system. Timer powered by battery when
heating or cooling equipment is on; timer takes power from system when cooling equipment is off.
THERMOSTAT
TIMER
BATTERY
3
C C RH RC
SUBBASE
L1
(HOT)
1
L2
L1
(HOT)
1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
2
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON COOLING, JUMPER C-RC
3
AND C-Y TERMINALS.
2
WY
HEAT
RELAY
COMPRESSOR
CONTACTOR
M826A
Fig. 20—Internal schematic and typical hookup for T8190A Thermostat/191108AJ Wallplate in heatingonly system.
TIMER
H
THERMOSTAT
WALLPLATE
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
HEAT
ANTICIPATOR
C
C
R
H
FALL
C
HEAT
ANTICIPATOR
WY
HEAT
RELAY
C
FALL
M827A
9 69-0642—1
69-0642—1 10
11 69-0642—1
Home and Building Control Home and Building Control Helping You Control Your World
Honeywell Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 740 Ellesmere Road
Golden Valley, MN 55422 Scarborough, Ontario
M1P 2V9
69-0642—1 12
Printed in Mexico
QUALITY IS KEY
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