Honeywell Q682B User guide

1 60-1179—7
MOUNTING
1. If replacing an existing thermostat, remove thermo-
stat and wallplate or subbase. To avoid miswiring, label
wires with the letter or number of each terminal as it is
disconnected. Be sure insulation on thermostat wires is in
good condition (not cracked, worn or frayed). Replace
wires if necessary.
If a new installation, prepare an opening for the thermo-
stat wires, run wires and pull about 3 in. [76 mm] through
the opening.
NOTE: Color-coded, 18-gauge thermostat cable (Under-
writers Laboratories Inc., approved limited energy safety
control wire) with one conductor to each wiring terminal
is recommended.
2. Use a spirit level for leveling the Q682 Switching
Subbase (Fig. 1) and mount to the wall with the three
screws provided. If mounting to a horizontal outlet box, use
the two machine screws furnished.
Fig. 1—Leveling the Q682 Switching Subbase.
J. H. • Rev. 4-94 • ©Honeywell Inc. 1994 • Form Number 60-1179—7
Q682B,D,L Switching Subbases
Application
AUTO OFF COOL HEATON
FAN
B
O
W
Y
R
G
M1555
SPIRIT LEVEL
PLUMB
LINE
PLUMB
BOB OR
WEIGHT
WIRING
Disconnect power supply before making wiring connec-
tions to prevent electrical shock or equipment damage.
All wiring must comply with local electrical codes and
ordinances.
Installation
WHEN INSTALLING THIS PRODUCT
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service tech-
nician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
1. Disconnect power supply to prevent electrical
shock or equipment damage.
2. On systems using a low-voltage gas valve,
never apply a jumper across valve coil terminals.
This may burn out thermostat heat anticipator.
IMPORTANT:
1. T8082, T8085, T8090, T8190 and T8095 Fuel Saver
Thermostats are mounted at true level when cali-
brated at the factory. An inaccurately leveled sub-
base will cause the temperature control to deviate
from set point.
2. Refer to thermostat Owner Manual for complete
installation instructions.
LOCATION
Locate the subbase about 5 ft. [1.5m] above the floor in
an area with good air circulation at average temperature.
Do not mount the subbase where the thermostat may be
affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from the sun, appliances or fireplace.
— concealed pipes and chimneys.
— unheated (uncooled) areas, such as an outside wall
behind the thermostat.
Switching
Subbase Use with Thermostat System Fan Application LED Options
Q682B T8082A; T8085A,B,C;
T8090A, T8095, T8190 HEAT-OFF- COOL AUTO-ON Heating/Cooling Clogged Filter LED
Q682D T8082A; T8085A,B,C;
T8090A, T8095, T8190 ON-OFF or AUTO-OFF AUTO-ON Heating-only or Cooling-only None
Q682L T8085R EM.HT.-HEAT-
OFF-COOL AUTO-ON Heat pump EM.HT. and AUX. HT. LEDs

60-1179—72
A letter code is located near each terminal for easy
identification.
The shape of the terminal barrier permits insertion of
straight or conventional wraparound wiring connections.
Either method is acceptable. When making wiring connec-
tions, strip wire to length specified in Fig. 2.
Fig. 2—Barrier configuration.
Fig. 3—Typical hookup for T8090A Thermo-
stat clock powered through the control
system. Clock powered by battery when
heating or cooling equipment is on; clock
steals power from system when heating
equipment is off.
BARRIER
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 in. [11 mm]
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
M1556B
The Q682B or D Subbase allows the T8082A or
T8085A,B,C Thermostat clock to be powered by the sys-
tem transformer or separate 24 Vac transformer. The Q682B
also allows the T8090A Thermostat clock to be powered by
the system transformer, separate 24 Vac transformer, bat-
teries, or through the control system. Refer to Figs. 3 and 4
for hookup diagrams of a T8090A powered through the
control system.
The Q682L Subbase uses a separate clock transformer.
Ensure 24V exists between the R and X terminals. Wire the
X terminal to transformer common to operate the LEDs and
24V clock.
Follow the equipment manufacturer wiring instructions,
if available. If not available, refer to typical system hook-
ups in Figs. 5 through 12.
Push any excess wire back into wall and plug the hole
carefully to prevent drafts from affecting the thermostat. To
mount and adjust thermostat, see the instructions included
with the thermostat.
L1
(HOT)
L2
1
1
L1
(HOT)
L2
1
HEAT
RELAY
COMPRESSOR
CONTACTOR
CLOCK
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER R H-RC TERMINALS WHEN ONE TRANSFORMER
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON HEATING, JUMPER
C-RC AND C-Y TERMINALS.
2
3
32
THERMOSTAT
BATTERY
SUBBASE
C C RH RC WY
M720
Fig. 4—Typical hookup for T8090A Thermo-
stat clock powered through the control
system. Clock powered by battery when
heating or cooling equipment is on; clock
steals power from system when cooling
equipment is off.
L1
(HOT)
L2
1
1
L1
(HOT)
L2
1
HEAT
RELAY
COMPRESSOR
CONTACTOR
CLOCK
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 HEATING, JUMPER
C-RH AND C-W TERMINALS.
2
3
32
THERMOSTAT
BATTERY
SUBBASE
C C RH RC WY
M1514B

3 60-1179—7
Fig. 5—Q682A Subbase with Fuel Saver Thermostat (T8195 shown) in an electric heat system with auto
fan.
HEAT
OFF
COOL
ON
AUTO
HC
H
C
FAN
SWITCH
T8095A
THERMOSTAT
Q682B
SUBBASE
M2496A
HEAT
ANTICIPATOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOTE INDICATION FOR FILTER (OPTIONAL).
1
COOL
ANTICIPATORS
HEAT
ANTICIPATOR
SYSTEM SWITCH
HEAT
OFF
COOL
BOGWY
COOL
DAMPER
HEAT
DAMPER FAN
RELAY
HEAT
RELAY
COMPRESSOR
CONTACTOR
1
L2
L1
(HOT)
2
2
CLOCK
R
C
FILTER
LIGHT
SWITCH
FALL
FALL
Fig. 6—Q682B Subbase with Fuel Saver Thermostat (T8195 shown) in a heating-cooling system with O
and B terminals for damper motors or changeover valve, and optional filter indicator LED.
HEAT
OFF
COOL
ON
AUTO
HC
H
C
FAN
SWITCH
T8095A
THERMOSTAT
Q682B
SUBBASE
M7185
HEAT
ANTICIPATOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
JUMPER 1-2 FOR AUTO FAN IN HEAT AND COOL MODE; I.E. HEAT PUMP AND
ELECTRIC HEAT APPLICATIONS.
JUMPER 1-Y FOR AUTO FAN WITH COOLING MODE ONLY.
1
COOL
ANTICIPATORS
HEAT
ANTICIPATOR
SYSTEM SWITCH
HEAT
OFF
COOL
BOGWY
COOLING
CHANGEOVER
HEATING
CHANGEOVER FAN HEATING COOLING
1
L2
L1
(HOT)
2
CLOCK
R
C2
3
3
FALL
FALL
C1 C2
R1 W1 Y1
RED
BLUE
BIMETAL BIMETAL
12

60-1179—74
Fig. 7—Q682B Subbase with Fuel Saver Thermostat (T8095 shown) showing separate heating and
cooling circuits.
HC
H
C
HEAT
ANTICIPATOR
COOL
ANTICIPATORS
HEAT
ANTICIPATOR
FALL
FALL
L1
(HOT)
L2
1
L1
(HOT)
L2
1
1
FAN
CONTROL HEATING
CONTROL
COOLING
CONTROL
CC RH G W Y
CLOCK
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER RC-RH TERMINALS WHEN ONE TRANSFORMER POWERS
BOTH HEATING AND COOLING.
IF USING SYSTEM TRANSFORMER TO POWER CLOCK, ADD H-C
JUMPER AND CONNECT C TO SYSTEM TRANSFORMER COMMON.
FOR SYSTEM USING SEPERATE TRANSFORMER TO POWER CLOCK.
2
2
3
4
4
3
ON
AUTO
HEAT
OFF
COOL
HEAT
OFF
COOL
FAN
SWITCH
3 POSITION
SYSTEM
SWITCH
FUEL SAVER
THERMOSTAT
Q682B
SUBBASE
M7223
RC
Fig. 8—Q682L Subbase with T8085R Thermostat in 2-heat, 1-cool add-on heat pump application.
H1 C1
L1
(HOT)
L2
1
1
FAN
RELAY
COMPRESSOR
CONTACTOR
CLOCK
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
2
T8085C
THERMOSTAT
Q682B
SUBBASE
H2
FALL FALL
RB
LXW2 W3 EYOG
EM. HT.
HEAT
OFF
COOL
EM. HT.
HEAT
OFF
COOL
EM. HT.
LED
AUX.
HT.
LED
ON
AUTO
HEAT
CHANGEOVER
RELAY
COOL
CHANGEOVER
RELAY
EMERGENCY
HEAT RELAY
AUXILIARY
HEAT
RELAY 1
AUXILIARY
HEAT
RELAY 2
COMPRESSOR
MONITOR SWITCH
LACO
RIGHT-HAND SWITCH BALL DETERMINES SWITCH POSITION
M7208
SYSTEM
SWITCH FAN
SWITCH

5 60-1179—7
Fig. 9—Q682B Subbase with Fuel Saver
Thermostat (T8090 shown) in a typical single-
stage heat pump circuit.
Fig. 10—Q682B Subbase with Fuel Saver
Thermostat (T8090 shown) in a typical
cooling-only circuit.
FAN
RELAY
REVERSING
VALVE
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONNECT VALVE TO O FOR POWER ON COOLING, OR B FOR
POWER ON HEATING.
IF USING SYSTEM TRANSFORMER TO POWER CLOCK, ADD R-C
JUMPER AND CONNECT C TO SYSTEM TRANSFORMER COMMON.
FOR SYSTEM USING SEPERATE TRANSFORMER
TO POWER CLOCK.
1
2
3
4
2
3
3
M7209
L1
(HOT)
L1
(HOT)
L2
L2
1
1
4
CCRBOGWY
HEAT PUMP
COMPRESSOR
RELAY
Q682B SUBBASE ADD JUMPER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
IF USING SYSTEM TRANSFORMER TO POWER CLOCK, ADD RC-C
JUMPER AND CONNECT C TO SYSTEM TRANSFORMER COMMON.
FOR SYSTEM USING SEPERATE TRANSFORMER TO
POWER CLOCK.
1
2
3
2
3
M7210
L1
(HOT)
L2
1
CCRHRC W G
Y
Q682B SUBBASE
AIR
CONDITIONER
FAN
ON
OFF
ON
AUTO
TIMER
FAN
SWITCH
T8195A
THERMOSTAT
Q682D
SUBBASE
M7190
HEATING
CONTROL
HEAT FAN
CONTROL
L2
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
IF USING SYSTEM TRANSFORMER TO POWER TIMER, ADD R-C JUMPER AND CONNECT C TO
SYSTEM TRANSFORMER COMMON.
FOR SYSTEM USING SEPARATE TRANSFORMER TO POWER TIMER.
FAN MUST BE CONNECTED TO GH IN HEATING-ONLY APPLICATIONS OR TO GC IN COOLING-
ONLY APPLICATIONS.
SOME MODELS USE AUTO INSTEAD OF ON.
SYSTEM
SWITCH
AUTO
ON
1
1
2
2
3
3
4
4
5
5
CC R GH GC WY
HC
H
C
HEAT
ANTICIPATOR
COOL
ANTICIPATORS
HEAT
ANTICIPATOR
FALL
FALL
R1 W1 Y1
RED
BLUE
BIMETAL BIMETAL
C1 C2
Fig. 11—Q682D Subbase with Fuel Saver Thermostat (T8195 shown) in a typical heating-only circuit.
Fan must be connected to GH terminal.

60-1179—76
Fig. 12—Q682D Subbase with Fuel Saver Thermostat (T8090 shown) in a typical cooling-only circuit.
Fan must be connected to GC terminal.
ON
OFF
ON
AUTO
TIMER
FAN
SWITCH
T8195A
THERMOSTAT
Q682D
SUBBASE
M5162B
L2
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
IF USING SYSTEM TRANSFORMER TO POWER TIMER, ADD R-C JUMPER AND CONNECT C TO
SYSTEM TRANSFORMER COMMON.
FOR SYSTEM USING SEPARATE TRANSFORMER TO POWER TIMER.
FAN MUST BE CONNECTED TO GH IN HEATING-ONLY APPLICATIONS OR TO GC IN COOLING-
ONLY APPLICATIONS.
SOME MODELS USE AUTO INSTEAD OF ON.
T8090 HAS TWO MERCURY BULBS, T8082 AND T8085 HAVE ONE MERCURY BULB.
SYSTEM
SWITCH
AUTO
ON
COOL FAN
CONTROL
1
1
2
2
3
3
4
4
5
6
6
5
CC R GH GC WY
HC
H
C
HEAT
ANTICIPATOR
COOL
ANTICIPATORS
HEAT
ANTICIPATOR
FALL
FALL
R1 W1 Y1
RED
BLUE
BIMETAL BIMETAL
C1 C2
COOLING
CONTROL

7 60-1179—7
SET SUBBASE SWITCHES
System switching positions control thermostat opera-
tion as follows:
EM.HT.—The emergency heat relay is energized. The
cooling system is off and the compressor is de-
energized. Emergency heat equipment is controlled
by the thermostat.
HEAT—Thermostat controls the heating system. Cool-
ing system is off.
OFF—Both heating and cooling systems are off. If the
fan switch is in AUTO position, the fan is also off.
COOL—Thermostat controls the cooling system. Heat-
ing system is off.
ON or AUTO—Thermostat controls the heating or cool-
ing system.
Fan switching positions control fan operation as fol-
lows:
ON—Fan operates continuously.
AUTO—In standard heating-cooling systems, fan oper-
ates with cooling equipment as controlled by the
thermostat in cooling and with the plenum switch in
heating. In heat pump and electric heat systems, fan
operates with the thermostat in both heating and
cooling.
Operation and Checkout
Check the operation of the system as follows:
1. Place the subbase system switch at HEAT, ON or
AUTO, and the fan switch at AUTO. Push the thermostat
temperature setting levers together at least 5°F [3°C]
above room temperature. The heating equipment should
start; fan starts after a short delay. In heat pump and electric
heat systems, fan starts immediately.
2. Place the system switch at COOL, ON or AUTO, and
the fan switch at AUTO. Push the thermostat temperature
setting levers together at least 5°F [3°C] below room
temperature. The cooling equipment and fan should start.
3. Place the fan switch to ON. The fan should run
continuously with the system switch at any position.
4. Place the system switch to OFF. Move the thermostat
temperature levers to various positions. The heating and
cooling systems should not respond.
5. When applicable, operate the entire system at least
one complete cycle with the system switch at COOL, ON or
AUTO and one complete cycle with the switch at HEAT,
ON or AUTO. Move the thermostat temperature levers and
the subbase switches to the desired positions before leaving
the installation.

60-1179—78
QUALITY IS KEY
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Honeywell Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 740 Ellesmere Road
Golden Valley, MN 55422 Scarborough, Ontario
M1P 2V9
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