Honeywell Q682B, 191108AJ User Manual

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