T8190A/191108AJ Heating or Cooling
Thermostat/Wallplate; T8190A/Q682B
Heating/Cooling Thermostat/Subbase
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 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.
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 FOR NON-BATTERY POWERED THERMOSTATS.
Type of Heating System to be Controlled Conditions/Compatibility
Electric (Line Voltage)—typical baseboard • The R8239D1015 Isolating Relay or R841 Silent Switching Center
a
and radiant
must be installed in the thermostat control circuit.
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
a, b
thermostat control circuit.
Oil
• If not using battery backup, assure that the 24V control transformer
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.
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. Check control
amperage requirement.
a
• 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.
• ©Honeywell Inc. 1994 • Form Number 69-0642—1
D.F. • Rev. 12-94 •
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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 sepa-
rately). 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.
SPIRIT LEVEL
PLUMB
LINE
O
WIRE WALLPLATE OR SUBBASE
B
R
G
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 con-
nections to prevent electrical shock or equipment damage.
W
Y
PLUMB
BOB OR
WEIGHT
FAN
COOL
ON
AUTO
HEAT
OFF
M1555
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.
NOTE: All wiring must comply with local electrical codes
and ordinances.
For Wallplate (Heating or Cooling Systems)
Refer to Fig. 5 and strip the thermostat wire insulation as
necessary.
This thermostat clock can be powered by a 24 Vac trans-
former with battery backup. Refer to Figs. 15 through 19 for
hookup diagrams of typical powering applications.
For heating-only systems, connect wires to R, W, and C
(ifapplicable)terminals (Fig.20).Forcooling-onlysystems,
connect wires R, Y, and C (if applicable) terminals. Firmly
tighten the screws.
3
69-0642—1
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Push excess wire back into the wall.
Plug the hole in wall with nonhardening caulk, putty, or
nonflammable insulation to prevent drafts from affecting
the thermostat operation.
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.
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.
Fig. 5—Methods of connecting terminals.
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND
BARRIER
CONNECTION—
NOTE: If wiring a dual transformer system, only the O or
STRIP 7/16 in. [11 mm]
the B terminal may be used.
Push excess wire back into the wall.
M1556B
TABLE 2—SUBBASE TERMINAL DESIGNATIONS.
Subbase Terminal
Control Function
R
Control transformer power.
R
R
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.
Heating control circuit.
c
h
W
Y
Cooling control circuit; jumper to W for heat pump compressor control if no
P terminal on subbase.
G
C
O
B
P
Fan control circuit.
Clock control (transformer common).
Cooling damper or changeover/reversing valve, makes continuously in cool.
Heating damper or changeover/reversing valve, makes continuously in heat.
Heat pump contactor; P terminal on some models only.
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.
Fig. 6—Thermostat mounting.
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.
TAB (2)
INSERT TIMER BATTERIES
MOUNTING SLOT (2)
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.
1
11
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.
35
30
25
20
10
CAPTIVE
MOUNTING SCREWS
WALLPLATE
OR SUBBASE
THERMOSTAT
BASE
M8674
69-0642—1
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Fig. 7—Insert timer batteries.
Fig. 8—Set timer.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
PROGRAM DIAL
PROGRAM
PIN (6)
TIMER
SETTING
KNOB
TIME
INDICATOR
ARROW
M8585
M821A
SET TIMER
Adjust the timer by moving the knob clockwise
.
Do not reverse the knob.
Let the system operate for one minute.
Adjust the heat anticipator lever to match the number that
reads on the ammeter.
When time is correctly set, the time indicator arrow
(triangle shape) points to the correct time and the corre-
sponding daytime (light) or nighttime (dark) portion of the
program dial (Fig. 8).
Fig. 9—Adjust heat anticipator.
SET HEAT ANTICIPATOR
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.
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.
ANTICIPATOR
SCALEPLATE
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.
ANTICIPATOR
SETTING LEVER
M7317
Fig. 10—Current rating of primary control.
OIL BURNER CONTROL
SHOWS
SHOWS
VOLTAGE
RATING
SHOWS LOW
CURRENT
VOLTAGE
DRAW
30 VAC
0.2 AMP
V8043E 1004 4
24V 50/60CY
SHOWS
ANTICIPATOR
SETTING
@ 60CY
.32 AMP
SHOWS
VOLTAGE
RATING
T
TO
BURNER
T
F
24 Vac 50/60 Hz
F
0.4 AMP
FROM MAIN
SHOWS
FUEL SUPPLY
ANTICIPATOR
SETTING
ZONE VALVE
M6116A
TYPICAL GAS VALVE
5
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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
CAUTION
Fig. 11—Attach cover.
Do not check operation by shorting across the
terminals of the system controls. This will damage
the heat anticipator.
50
60
70
80
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.
M8604
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.
SET TEMPERATURE CONTROL LEVERS
Thetwoleversonthetopofthethermostatcontrolthelow
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.
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
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.
NOTE: To avoid compressor damage, do not operate the
system when outdoor temperature is below 50° F [10°C].
Refer to manufacturer recommendations.
Fig. 12—Temperature control levers.
LOW TEMPERATURE
(BLUE MARK)
SET LEVER
HIGH TEMPERATURE
(RED MARK)
SET LEVER
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.
Reset both temperature setting levers to the desired
temperatures.
M859
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.
SET SUBBASE SWITCHES (IF APPLICABLE)
The subbase system switch controls system operation as
follows:
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.
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.
69-0642—1
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NOTE: To avoid compressor damage, do not operate the
system when outdoor temperature is below 50° F [10° C].
Refer to manufacturer recommendations.
Fig. 13—Thermometer calibration.
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.
INCREASE
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 tem-
peratures.
Leave Owner’s Manual and Assistance Information in a
convenient place for the building occupant or provide with
other appliance manuals.
M5128
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
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. Mov-
ing both levers, place the HIGH lever at the thermometer
reading. Hold lever so it does not move, and gently turn the
Calibration
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.
until 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.
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.
Fig. 14—Use of 104994A calibration wrench.
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.
CALIBRATION
WRENCH
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.
ANTICIPATOR
SETTING
LEVER
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.
.35
.30
ANTICIPATOR
SCALEPLATE
.20
.10
M8583
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 posi-
tion are approximately the same at the instant the mercury
moves to the other end, no recalibration is needed.
7
69-0642—1
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Typical Wiring Diagrams
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).
Fig. 15—Typical hookup for timer powered by
separate 24-Vac transformer.
TIMER
TIMER
2
BATTERY
THERMOSTAT
BATTERY
THERMOSTAT
SUBBASE
C
R
C
W
SUBBASE
C
R
C
W
HEAT
RELAY
L1
(HOT)
1
L1
(HOT)
L2
1
L2
HEAT
RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M824A
1
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
2
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.
BATTERY BACKUP MAY BE USED IF POWER TO
TIMER IS INTERRUPTED.
M822A
THERMOSTAT
Fig. 16—Typical hookup for timer powered by
two AAA alkaline batteries only.
TIMER
TIMER
BATTERY
BATTERY
THERMOSTAT
3
C
C
RH
RC
W
Y
2
SUBBASE
SUBBASE
C
R
C
W
HEAT
RELAY
L1
(HOT)
1
HEAT
RELAY
L1
(HOT)
L2
1
COMPRESSOR
CONTACTOR
L1
(HOT)
L2
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M823A
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON HEATING, JUMPER
M825A
C-RH AND C-W TERMINALS.
69-0642—1
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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
W
Y
2
SUBBASE
HEAT
RELAY
L1
(HOT)
1
L2
COMPRESSOR
CONTACTOR
L1
(HOT)
1
L2
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON COOLING, JUMPER C-RC
AND C-Y TERMINALS.
M826A
Fig. 20—Internal schematic and typical hookup for T8190A Thermostat/191108AJ Wallplate in heating-
only system.
TIMER
H
THERMOSTAT
H
C
C
HEAT
ANTICIPATOR
FALL
HEAT
ANTICIPATOR
FALL
WALLPLATE
C
R
C
W
Y
HEAT
RELAY
L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
M827A
9
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11
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Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Helping You Control Your World
Scarborough, Ontario
M1P 2V9
QUALITY IS KEY
Printed in Mexico
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