Honeywell Q674L Users Manual 69 0392 T874R Thermostats And Subbases

Bryant Thermostat T874 69-0392

Q674L to the manual 7a82d01c-d432-4da7-b06b-cd8c603f0948

2015-01-23

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T874R Thermostats and Q674L Subbases
Installation Instructions for the Trained Service Technician.
INSTALLATION INSTRUCTIONS

APPLICATION
The T874R Thermostat and Q674L Subbase provide 24 to 30 Vac control of 2-stage heating and 1-stage cool-ing heat
pump systems with manual changeover. Q674L Subbase provides EM.HT.-HEAT-OFF-COOL system switching and
AUTO-ON fan switching. See Table 1 for specific T874R/Q674L combinations.
Table 1. Thermostat/Subbase Specifications.
Thermostat/
Subbase
Model
Numbers

LED
Indication

Y594R1243

T874R1152/
Q674L1207

AUX.HT.,
EM. HT.

Manual Cool

TRADELINE ® ; adjustable stage 2
heat anticipation. Fixed anticipation
in stage 1. Auto fan in EM.HT.

Y594R1300

T874R1475/
Q674L1520

AUX.HT.,
EM. HT.a

Manual Heat
or Cool

TRADELINE ® ; fixed heat
anticipation. Auto fan in EM.HT.

Y594R1425

T874R1616/
Q674L1587

AUX.HT.,
EM. HT.,
CHECK

Manual Heat
or Cool

SUPER TRADELINE® ; fixed heat
anticipation. Factory installed jumper
across W1 and Y1. Auto fan in
EM.HT.

Y594R1615

T874R1822/
Q674L1710

AUX.HT.,
EM. HT.,
CHECK

Manual Heat
or Cool

TRADELINE ® ; fixed heat
anticipation. Auto fan in EM.HT.

Y594R1664

T874R1871/
Q674L1736

EM. HT.

Manual Cool

TRADELINE ® ; exact replacement
for York model no. 2TH11702224.

Y594R1672

T874R1889/
Q674L1736

EM. HT.

Manual Cool

TRADELINE ® ; exact replacement
for York model nos. 2TH11702324
and 6TH11702224.

Y594R1698 b

T874R1905/
Q674L1777

EM. HT.

Manual Cool

TRADELINE ® ; exact replacement
for York model nos. 2TH11702324
and 6TH11702224. Includes
C815A1054 Outdoor Thermistor.

Y594R1706 b

T874R1913/
Q674L1777

EM. HT.

Manual Cool

TRADELINE ® ; exact replacement
for York model no. 2TH11702224.

Y594R1763

T874R1954/
Q674L1827

AUX.HT.,
EM. HT.a

Manual Cool

Requires C815A Outdoor Thermister
for outdoor reset. Fixed stage 1 heat
anticipation. No heat anticipation in
stage 2 heat. Auto fan in EM.HT.
Replaces Y594R1136.

Y594R1797

T874R1988/
Q674L1868

AUX.HT.,
EM.HT.

Manual Heat
or Cool

TRADELINE ®

Thermostat/
Subbase
Package

a
b

Changeover

See
Fig.

Comments

EM.HT. LED also shows compressor malfunction.
Premier White® color.

®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •

X-XX UL

69-0392-9

T874R THERMOSTATS AND Q674L SUBBASES

OPERATION

CAUTION
1.

On a 2-heat thermostat, the two stages of heat make
sequentially as the temperature drops. Make refers to the
mercury switch initiating a call for heat or cool.

There is about 1° F (0.6° C) between stages so the second stage makes only when the first stage can not handle
the load. The 1° F (0.6° C) is referred to as the interstage
differential.

3.
4.

The light emitting diodes (LED) on the subbase light when
something specific happens within the system. When an
LED lights, refer to this list for the meaning:
EM. HT.: Emergency heat is operating. The compressor has failed, and the heat pump is not operating.
LED lights when system switch is placed in the
EM.HT. position by the homeowner.
AUX.HT.: Auxiliary heat is operating, which means the
weather is so cold that the heat pump cannot handle
the load.
CHECK: System needs to be checked. See heating
sys-tem instructions for specific meaning.

5.
6.

Disconnect power supply to prevent electrical
shock or equipment damage.
To prevent interference with the thermostat
linkage, keep wire length to a minimum and
run wires as close as possible to the subbase.
Push excess wire back into the hole and plug
hole to prevent drafts from affecting thermostat operation.
Do not overtighten thermostat captive
mounting screws because damage to
subbase threads can result.
Do not short across coil terminals on heating
relay or gas valve. This can burn out the
thermostat heat anticipator.
Never install more than one wire per terminal
unless factory-supplied jumper with spade
terminals is used.

IMPORTANT
Thermostats are calibrated at the factory using
subbase mounted at true level. Inaccurate
subbase leveling causes the actual temperature
to deviate from the setpoint temperature.

NOTE: LEDs are not field replaceable or addable.

Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
Do not install the thermostat where it can be affected by:
— drafts or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.

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
mer-cury 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.

Mounting The Subbase
The thermostat subbase can be mounted on a vertical
outlet box, horizontal outlet box or directly on the wall.
1. If you must mount the subbase on a vertical outlet
box, order Honeywell 193121A Adapter Assembly.
See Fig. 1. The assembly includes an adapter ring,
two screws and a cover plate to cover marks on the
wall. Install the ring and cover plate on the vertical
outlet box.

INSTALLATION
When Installing this Product…

For a wall installation, hold subbase in position and
mark holes for anchors. See Fig. 2. Obtain wall
anchors locally. Be careful that the wires do not fall
back into the wall opening. Set aside subbase. Drill
two 3/16 in. (5 mm) holes and gently tap anchors
into the holes until flush with the wall.

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
technician.
4. After installation is complete, check out product
operation as provided in these instructions.

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

VERTICAL
OUTLET
1
BOX

4. Secure the cover plate (if used) and subbase with
the screws provided. Do not fully tighten the
subbase screws.
5. Level the subbase by using a spirit level. Firmly
tighten subbase mounting screws. See Fig. 3. The
subbase mounting holes provide for minor out-oflevel adjustments.

COVER
PLATE 2

ADAPTER
RING
2

IMPORTANT
An incorrectly leveled subbase causes the
temperature control to deviate from setpoint.

MOUNTING
SCREWS (2)

Wiring the Subbase
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring
instructions when available. To wire subbase, proceed as
follows:
1. Connect the system wires to the subbase. See Fig.
5-12. A letter code for identification is located near
each terminal. The terminal barrier permits straight
or conventional wraparound wiring connection. See
Fig. 4.
2. Firmly tighten each terminal screw.
3. Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.

SUBBASE
MOUNTING
SCREWS (2)

HORIZONTAL
OUTLET
1
BOX

MOUNTING
SCREWS (2)
SUBBASE

NOT INCLUDED WITH UNIT.

ACCESSORY PARTS AVAILABLE (193121A).

M925

Fig. 1. Installation of subbase on outlet box.

SPIRIT LEVEL

TOP
MOUNTING
HOLES (2)

THERMOSTAT
CABLE OPENING

WIRING
TERMINAL

WALL

WIRES THROUGH
WALL OPENING

WALL
ANCHORS
(2)

M926

SUBBASE

POST (2) FOR
MOUNTING
THERMOSTAT

MOUNTING
HOLES (2)

MOUNTING
HOLES

TO SPRING FINGER
CONTACTS ON THE
THERMOSTAT
(UP TO 12)
M927

Fig. 3. Subbase components and leveling procedure.

MOUNTING
SCREWS (2)

FOR STRAIGHT
INSERTION–
STRIP 5/16 IN. (8 MM)

Fig. 2. Installation of subbase on wall.

FOR WRAPAROUND–
STRIP 7/16 IN. (11 MM)

2. Run wires to the thermostat location.
3. Pull wires through the cover plate (if used) and subbase cable opening. See Fig. 3.
BARRIER

IMPORTANT
Use 18 gauge, color-coded thermostat cable for
proper wiring.

SUBBASE TERMINAL SCREW

M928

Fig. 4. Wiring connections.

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

SUBBASE

THERMOSTAT

SYSTEM COMPONENTS

FAN RELAY
W
2

AUX. HT.
LED (GREEN)

AUTO
H1

AUX. HEATER
RELAY

B
3

FALL

EM. HT.
LED (RED)

FAN
SWITCH

COMPRESSOR
MONITOR

F
1
4

L1
(HOT)
L2

H2
5

FALL

SYSTEM
SWITCH
T
EM. HT.

HEAT

OUTDOOR
THERMISTOR

X2
OFF
11

OUTDOOR
THERMOSTAT

COOL
O

COMPRESSOR
RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

COOL
CHANGEOVER
VALVE

Y
M2970

2 FIELD REMOVABLE JUMPER.

Fig. 5. Internal schematic and typical wiring diagram for Y594R1763 (T874R1954/Q674L1827). Replaces
GE AY28X078, AY28X139; Trane Baystat 139, Baystat 239 and Baystat 240;
and Honeywell Y594R1136 Thermostats.
THERMOSTAT

SUBBASE

SYSTEM COMPONENTS
(HOT) L1

L2
1

H1/C1
ANTICIPATOR
R

FALL

ODT 1

RTD 1

EHR 1

RTD 2

W3
3

FAN SWITCH

ODT 2

AUTO
EHR 2

H2
ANTICIPATOR
5

RTD 3

W2
RTD 1

AUX. HT.
LED
(GREEN)

FALL

X
EM. HT.
LED (RED)

SYSTEM
SWITCH

SYSTEM
MONITOR

FAN RELAY

EM. HT.

HEAT
OFF

COOL CHANGEOVER
VALVE

COOL

EM. HT.
RELAY

CHP

LACO
Y
B

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

AUXILIARY HEAT LED AVAILABLE ON SOME MODELS.

COMPRESSOR
CONTACTOR

M5072A

Fig. 6. Internal schematic and typical wiring diagram for Y594R1243 (T874R1152/Q674L1207).

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

THERMOSTAT

SUBBASE

SYSTEM COMPONENTS
L1
L2
(HOT)

ODT 1
1
2
H1

RTD 2

EHR 1

H1/C1
ANTICIAPTOR

RTD 1

FALL
ODT 2

FAN
SWITCH

RTD 3

EHR 2

AUTO
ON
R

5
L
H2
FALL

EM. HT.
LED (RED)

H2
ANTICIPATOR

COMPRESSOR
MONITOR
X

AUX. HT.
LED
(GREEN)

RTD 1
W2

SYSTEM
SWITCH

EM. HT.
10

FAN RELAY

G
2

HEAT

COOL
CHANGEOVER VALVE

OFF
O

POWER SUPPLY. PROVIDE
DISCONNECT MEANS AND
OVERLOAD PROTECTION
AS REQUIRED.

EM. HT. RELAY

COOL
E

CHP

LACO

CONNECT CHANGEOVER
RELAY TO B FOR HEAT
CHANGEOVER, TO O FOR
COOL CHANGEOVER.

Y
COMPRESSOR
CONTACTOR

HEAT
CHANGEOVER VALVE
M1030A

Fig. 7. Internal schematic and typical wiring diagram for Y594R1300 (T874R1475/Q674L1520); fixed anticipation.
THERMOSTAT

SUBBASE

SYSTEM COMPONENTS

W3 RELAY

O
COOL CHANGEOVER
VALVE
L
H1
ANTICIPATOR
1

FAN
SWITCH

COMPRESSOR
MONITOR
FAN RELAY

AUTO
ON

C ANTICIPATOR

L1
(HOT)
L2

1
W2

H1
C

5
H2
ANTICIPATOR
H2

EM. HT.
LED (RED)

FALL

SYSTEM
SWITCH

AUX. HT.
LED (GRN)

EM. HT. RELAY

EM. HT.
X

HEAT
6

AUX. HT. RELAY

OFF

FALL

COOL

HEAT
CHANGEOVER
VALVE

B
11

W1 RELAY

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

2 REMOVE JUMPER WHEN W1 RELAY IS USED.

3 FACTORY-INSTALLED JUMPER.

COMPRESSOR
RELAY
M5067

Fig. 8. Internal schematic and typical wiring diagram for Y594R1425 (T874R1616/Q674L1587). SUPER
TRADELINE®; universal model for heat, cool, or first stage heating changeover systems.
CHECK LED has isolated terminals for use in all systems.
5

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

SYSTEM COMPONENTS

SUBBASE

THERMOSTAT

L1
(HOT)
2
FALL
H1

FAN SWITCH

H1/C1
ANTICIPATOR

FAN RELAY
AUTO
3

ON
R

AUX. HT. RELAY
W

5
FALL

H2
6

H2
ANTICIPATOR

SYSTEM
SWITCH

"H" RELAY

EM. HT.
LED (RED)
X
EM. HT. RELAY

EM. HT.
T
HEAT

C815A1039
THERMISTOR

OFF
O
COOL

CHANGEOVER VALVE (COOL)

11
Y
RESET HEATER
COMPRESSOR
CONTACTOR

12
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

M3173A

Fig. 9. Internal schematic and typical wiring diagram for Y594R1664 (T874R1871/Q674L1736) and Y594R1706
(T874R1913/Q674L1777). Exact replacement for York model no. 2TH11702224.
SUBBASE

THERMOSTAT

SYSTEM COMPONENTS

W3 RELAY
W3

O
COOL
CHANGEOVER VALVE

H1
ANTICIPATOR

L
CHECK
LED (RED)

1
C ANTICIPATOR

COMPRESSOR
MONITOR
FAN RELAY

FAN
SWITCH

2
G

AUTO
ON

L1
(HOT)
L2

C
W2

FALL
3
SYSTEM
SWITCH

AUX. HT. RELAY

EM. HT.
LED
(RED)

E
AUX. HT.
LED
(GREEN)

EM .HT.
5

HEAT

COOL

H2
ANTICIPATOR
H2

EM. HT. RELAY
X

OFF
B

FALL

HEAT
CHANGEOVER VALVE

Y
11
1

COMPRESSOR
RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

M5068

Fig. 10. Internal schematic and typical wiring diagram for Y594R1615 (T874R1822/Q674L1710). TRADELINE;
intended for use in applications where W2 and E terminals are not jumpered.

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

SYSTEM COMPONENTS

SUBBASE

THERMOSTAT

L1
(HOT)
2
FALL
H1

FAN SWITCH

H1/C1
ANTICIPATOR

FAN RELAY
AUTO
3

ON
R

AUX. HT. RELAY
W

5
FALL

H2
6

"H" RELAY

H2
ANTICIPATOR

SYSTEM
SWITCH

EM. HT.
LED (RED)
X
EM. HT. RELAY

EM. HT.
T
HEAT

C815A1039
THERMISTOR

OFF
O
COOL

CHANGEOVER VALVE (COOL)

11
Y
RESET HEATER
COMPRESSOR
CONTACTOR

12
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

M3173A

Fig. 11. Internal schematic and typical wiring diagram for Y594R1672 (T874R1889/Q674L1736) and Y594R1698
(T874R1905/Q674L1777). Exact replacement for York model nos. 2TH11702324 and 6TH11702224.

THERMOSTAT

SYSTEM COMPONENTS

SUBBASE

L1
(HOT)

L
2
H1/C1
ANTICIPATOR
3

EM. HT.
LED (RED)
3

FAN
SWITCH
W3

AUTO

C1
FALL

4
H2
ANTICIPATOR
H2

FALL

1
AUX. HT.
RELAY

X
AUX. HT.
LED (GRN)

AUX. HT.
RELAY

6
SYSTEM
SWITCH

FAN RELAY
G

EM. HT.
HEAT

COOL CHANGEOVER
VALVE

OFF

COOL
E
EM. HT. RELAY
Y
COMPRESSOR
CONTACTOR
B
1

"B" RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

TERMINAL LABELED C/X ON SOME MODELS.

W3 TERMINAL AVAILABLE ON SOME MODELS ONLY.

M3683A

Fig. 12. Internal schematic and typical wiring diagram for Y594R1797 (T874R1988/Q674L1868).

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

1. Connect an ac ammeter of appropriate range
between the heating terminals of the subbase:
Stage 2: between W2 and R.
2. Move the system switch to HEAT.
3. After one minute, read the ammeter and record the
reading:
Stage 2: _______________amperes.
4. After mounting the thermostat, set the adjustable
heat anticipator to match the respective reading
measured in step 3.

Mounting the Thermostat
1. Remove the thermostat cover by pulling the bottom
edge of the cover away from the base until it snaps
free from the cover clip.
NOTE: The cover is hinged at the top and can be
removed by pulling out at the bottom.
2. Carefully remove and discard polystyrene packing
insert that protects the mercury switches during
shipment.
3. Turn over the thermostat base and note the spring
fingers that engage the subbase contacts. Make
sure the spring fingers are not bent flat, preventing
proper electrical contact with the subbase.
4. Note the two tabs on the top inside edge of the
thermostat base. The tabs fit into corresponding
slots on the top of the subbase. Mount the thermostat on the subbase.
5. Align the two captive mounting screws in the
thermostat base with the posts on the subbase. See
Fig. 13. Tighten both screws. Do not overtighten
screws or damage to subbase posts can result.
6. Hang the upper edge of the thermostat cover on top
of the thermostat base and swing cover downward
until it engages with the cover clip.

If equipment cycles too fast, set the anticipator to a higher
current rating, not more than one-half division at a time,
and recheck cycle rate. Most conventional 2-stage heating
equipment is designed to operate at 3 cycles per hour per
stage. See Fig. 14.
Most heat pump systems should cycle 2-1/2 to 3 times
per hour.

2 .1

THERMOSTAT
MOUNTING SLOTS (2)
.1

THERMOSTAT
MOUNTING POST (2)

.3
1.2 .8 .6 .4

MOVE INDICATOR TO
MATCH CURRENT RATING
OF PRIMARY CONTROL

M3684

Fig. 14. Adjustable heat anticipator scale.
AT
HE

Temperature Setting

SUBBASE

Move the setpoint lever to the desired comfort position.
One lever controls both heating and cooling.
THERMOSTAT
M3266

Subbase Setting

CAPTIVE MOUNTING
SCREWS (2)

System switching positions control thermostat operation as
follows:
OFF: Heating and cooling systems are off. If the fan
switch is at the AUTO position, the cooling fan is
also off.
HEAT: Heating system is controlled by the thermostat.
Cooling system is off.
COOL: Cooling system is controlled by the thermostat.
Heating system is off.
EM.HT.: Emergency heat relay is energized on call for
heat. Cooling system is off. Compressor is deenergized.

Fig. 13. Mounting thermostat on subbase.

SETTINGS

CAUTION

On systems using a gas valve, never apply a
jumper across the valve coil terminals, even
temporarily. This can burn out the thermostat heat
anticipator(s).

Fan switching positions control fan operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates as controlled by the thermostat.

Heat Anticipator Setting
(2nd Stage Y594R1243)
Set the heat anticipator scale to match the primary control
current draw. When using a T874 Thermostat with two
stages of heating, set the heat anticipator to match the
respective primary control current draw. If the primary
control nameplate has no rating or if further adjustment is
necessary, use the following procedure to determine the
current draw. Measure the current draw with the thermostat removed and the power on.

69-0392—9

To switch positions, use thumb and index finger to slide
lever to desired position. Stop switch lever in detent
directly over the desired function indicator mark for proper
circuit operation.

T874R THERMOSTATS AND Q674L SUBBASES

CHECKOUT

CALIBRATION

Heating

Thermostat

Move the system switch on the Q674 Subbase to HEAT.
Move the setpoint lever on the T874 Thermostat about
10° F (6° C) above room temperature. Both stages of
heating and the fan should start. Move the setpoint lever
about 10° F (6° C) below room temperature. Heating and
fan should shut off.

T874 Thermostats are accurately calibrated at the factory.

There is no provision for field calibration.

Thermometer
The thermometer in the thermostat has been accurately
calibrated at the factory. The thermometer should need
adjustment only if it was dropped or shifted due to
mishandling.

NOTE: To prevent compressor short cycling, some
manufacturer equipment includes a minimum-off
timer to provide a five-minute time delay before
turning on the compressor after the thermostat
last turned off the compressor, or after the
system first received power. This delay protects
the compressor.

If the setpoint lever and the thermometer reading do not
agree:
1. Remove the thermostat cover by pulling out 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 10 or 15 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 into the thermometer and turn it until the
thermometers have the same reading. See Fig. 15.
6. Replace thermostat cover and put the system into
operation.

Cooling

CAUTION

Do not operate cooling if the outdoor temperature
is below 50° F (10° C). Refer to manufacturer
recommendations.
Move the system switch on the Q674 Subbase to COOL.
Move the setpoint lever on the T874 Thermostat about
10° F (6° C) below room temperature. Cooling and fan
should start (see NOTE above). Move the setpoint lever
about 10° F (6° C) above room temperature. Cooling and
fan should stop.

NOTE: Radiant heat from hands offsets the thermometer
reading. After making each adjustment, wait 10
or 15 minutes for the thermometer to stabilize
before comparing.

Emergency Heat
Move the system switch to EM.HT. The EM.HT. LED
should come on. Move the setpoint lever about 10° F
(6° C) above room temperature. The electric strip heater(s)
should come on. Move the setpoint lever about 10° F
(6° C) below room temperature. The electric strip heater
should de-energize. The EM.HT. LED remains on until
system switch is moved to another position.

Fan
Move the subbase system switch to OFF and the fan
switch to ON. The fan should run continuously. When the
fan switch is in the AUTO position, fan operation is controlled by the heating or cooling system.

M5070

Fig. 15. Thermometer calibration

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

69-0392—9

T874R THERMOSTATS AND Q674L SUBBASES

Automation and Control Solutions
Honeywell International Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario M1V 4Z9

69-0392—9 G.H. Rev. 10-97

www.honeywell.com/yourhome

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Title                           : 69-0392 -T874R Thermostats and Q674L Subbases
Description                     : Installation Instructions
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Subject                         : Installation Instructions
Author                          : Honeywell Technical Communications

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Honeywell Q674L Users Manual 69 0392 T874R Thermostats And Subbases

Bryant Thermostat T874 69-0392

Q674L to the manual 7a82d01c-d432-4da7-b06b-cd8c603f0948

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