Honeywell T87F Thermostat User Manual

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T87F Thermostats  
PRODUCT DATA  
FEATURES  
For 24 Vac to 30 Vac control of heating or cooling  
systems.  
Thermostat cover ring may be painted to match room  
decor.  
Knurled dial provides easy setpoint adjustment.  
Separate temperature setting and thermometer scale  
located on face of thermostat.  
T87F Easy-to-  
See™ Round  
Model  
T87F Standard  
Model  
T87F Designer  
Model  
T87F distinctive style makes an attractive addition to  
almost any decor.  
Enhanced setpoint visibility model available for the  
visually impaired.  
APPLICATION  
T87F Thermostats provide temperature control for residential  
heating, cooling, or heating-cooling systems. The T87F is  
designed with a dustproof spdt mercury switch, an adjustable  
heat anticipator and a concealed wallplate for 2-wire heating  
hookups. The Tradeline® T87F wallplate is designed for 2-  
wire heating or cooling, 3-wire spdt heating (series 20), or 3-  
wire spdt heating-cooling with remote switching. The wallplate  
also provides cooling anticipation.  
The Q539 Subbase may be added for system and fan  
switching. The Q539 Subbase also provides cooling  
anticipation.  
Contents  
Application.........................................................................1  
Features ............................................................................1  
Specifications ....................................................................2  
Ordering Information .........................................................2  
Installation .........................................................................3  
Wiring ................................................................................4  
Settings and Checkout ......................................................7  
Operation...........................................................................8  
Recalibration .....................................................................8  
®
U.S. Registered Trademark  
Copyright © 2002 Honeywell • All Rights Reserved  
60-2222-3  
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T87F THERMOSTATS  
SPECIFICATIONS  
IMPORTANT  
This product is tested and calibrated under closely  
Standard Models:  
controlled conditions and some minor differences in  
performance can be expected if those conditions are  
changed. The specifications in this publication do not  
include normal manufacturing tolerances; therefore,  
an individual unit may not exactly match the listed  
specifications.  
T87F Heating, Cooling, or Heating-Cooling Thermostat. Ther-  
mostat includes 104456B Wallplate for heating only sys-  
tems. Order Q539 Subbase for heating-cooling.  
Electrical Ratings: 1.5A at 30 Vac.  
Heat Anticipator: Adjustable 0.1 to 1.2A.  
Cooling Anticipator: 0 to 1.5A, 24 Vac to 30 Vac.  
Temperature Ratings: 50°F to 100°F (10°C to 38°C).  
Switching Action: Dust-free spdt mercury switch.  
Temperature Sensing: Coiled bimetal.  
Tradeline® Models:  
For use in series 80 heating, cooling, or heating-cooling  
circuit, or for use in series 20 (spdt) heating only circuit.  
Tradeline® specifications are the same as those of standard  
models, except as follows:  
T87F Heating, Cooling, or Heating-Cooling Thermostat.  
T87F Enhanced Setpoint Visibility Model for the visually  
impaired.  
T87F models that meet Department of Defense (DoD) Manual  
Dimensions:  
4
270.1-M specifications.  
T87F: 3-1/4 in. (82.5 mm) diameter, 1-1/2 in. (38 mm) deep.  
With 137421 Wallplate: 3-11/16 in. (93.5 mm) diameter, 1-3/4  
in. (44.5 mm) deep.  
Model for heating. control. Locking cover, without thermome-  
ter, 72°F (22°C) maximum heat.  
Model for cooling control, locking cover, without thermometer,  
With Q539 Subbase: 3-11/16 in. (93.5 mm) diameter, 1-3/4 in.  
7
8°F 26°C) minimum cool.  
(44.5 mm) deep.  
T87F with locking cover, range stops 35°F to 65°F (2°C to  
8°C) range.  
1
Mounting: Thermostat mounts on furnished wallplate, or sub-  
base (order separately).  
Temperature Ratings:  
Setting Range:  
Finish: Premier White® or taupe.  
Most models: 40°F to 90°F (4°C to 32°C).  
Models with positive Off: 50°F to 90°F (10°C to 32°C).  
Optional Specifications:  
Positive Off Models (specify heating or cooling):  
Mounting:  
6
0°F to 100°F (16°C to 38°C) or 50°F to 90°F (10°C to  
T87F (without positive Off) furnished with 137421A Wallplate.  
T87F (with positive Off) furnished with 137421B Wallplate.  
Both wallplates suitable for controlling 2-wire spst heating or  
cooling, 3-wire spdt heating-cooling, or 3-wire spdt series  
32°C) range.  
Locking Cover and Range Stop Models:  
6
0°F to 90°F (16°C to 32°C).  
4
5°F to 75°F (7°C to 24°C) range, 68°F marked on scale.  
20 heating systems.  
Scale Range Models:  
40°F to 90°F (4°C to 32°C).  
45°F to 75°F (7°C to 24°C).  
5°C to 30°C (67°F to 112°F).  
10°C to 30°C (67°F to 86°F).  
10°C to 35°C (67°F to 95°F).  
Additional Tradeline® Features:  
Cover ring included for covering old thermostat marks or for  
mounting T87F on outlet box.  
1
37421 Wallplate extends beyond thermostat for trim appear-  
ance (198170A Wallplate for Designer Models).  
Tradeline® pack with cross reference label and special  
instruction sheet.  
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T87F THERMOSTATS  
Accessories:  
Q539 Subbases—provide system and fan switching and cool-  
ing anticipation (unless otherwise specified) for T87F heat-  
ing, cooling and heating-cooling thermostats.  
TG587F1008 Thermostat Guard Key Lock Cover with window.  
TG587F1016 Thermostat Guard Key Lock cover without  
window.  
3. Installer must be a trained experienced service techni-  
cian.  
4. After installation is complete, check out product opera-  
tion as provided in these instructions.  
Location  
1
1
1
1
1
1
1
04456B Two terminal heat only T87 Wallplate.  
37421AE-T87 Taupe Wallplate with positive Off.  
37421K-T87 Taupe Wallplate without positive Off.  
37421R-T87 White Wallplate.  
Locate the thermostat about 5 ft (1.5m) above the floor in an  
area with good air circulation at average temperature.  
98170A Designer Beige Adapter Kit.  
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.  
98172 Cover Ring for T87 Designer Beige models.  
99933 Cover Ring for Taupe T87 models.  
1
14855-00029 Cover Ring for Gold T87 models.  
— radiant heat from sun or appliances.  
— concealed pipes and chimneys.  
1
1
2
37421A-T87 Gold Wallplate without positive Off.  
37421B-T87 Gold Wallplate with positive Off.  
21886A Easy-to-Use™ Clear Ring. Durable plastic ring  
snaps on Easy-to-See models.  
— unheated (uncooled) areas such as an outside wall behind  
the thermostat.  
202687A Premier White® Adapter Kit includes 6 in. cover  
assembly and adapter ring to mount on outlet box or cover  
marks from old thermostats.  
This thermostat is a precision instrument and was carefully  
adjusted at the factory. Handle it carefully.  
32005439-001 Taupe Adapter Kit includes 6 in. cover assem-  
bly and adapter ring to mount on outlet box or cover marks  
from old thermostat.  
Mount Wallplate or Subbase  
IMPORTANT  
Use a spirit level to accurately level the wallplate or  
subbase as shown in Fig. 1. Inaccurate leveling may  
cause the thermostat to deviate from setpoint.  
MERCURY NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old control  
in the trash. Dispose of properly.  
When using the T87F with a Q539 Subbase, follow  
the mounting and wiring instructions for the subbase.  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of an old control.  
Use the cover ring (if desired), adapter plate (if needed),  
wallplate or subbase, T87F and screws as shown in Fig. 2 and  
3.  
IMPORTANT  
Before mounting the thermostat, see Setting and  
Checkout section, Heat Anticipator Adjustment sub-  
section.  
INSTALLATION  
CAUTION  
1. Place the cover ring on the wall at the desired location  
with the cable entrance holes to the left.  
Voltage Hazard.  
Can cause electrical shock or equipment damage.  
NOTE: If an outlet box is used, place the cable entrance  
holes toward the bottom. The side showing MADE IN  
U.S.A. must be against the wall.  
Disconnect power before beginning installation.  
CAUTION  
2
.
Pull the thermostat cable through the entrance hole of  
the cover ring and the entrance hole of the wallplate or  
subbase and adapter plate (if used).  
Equipment Damage Hazard.  
Improper installation can burn out thermostat heat  
anticipator.  
3. Fasten the cover ring, adapter plate (if used), and the  
wallplate or subbase.  
On systems using a low voltage gas valve, do not  
apply a jumper across the valve coil terminals.  
4. Level the wallplate as shown in Fig. 1 and tighten the  
screws.  
5.  
After wiring the subbase or wallplate, plug the hole to  
prevent interior wall drafts from affecting the thermostat.  
When Installing this Product. . .  
1
.
.
Read these instructions carefully. Failure to follow them  
could cause a hazardous condition.  
6. Align the thermostat over the wallplate and tighten the  
three captive mounting screws.  
2
Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
3
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T87F THERMOSTATS  
THERMOSTAT  
CABLE  
ENTRANCE  
1
04456B WALLPLATE  
SPIRIT LEVEL  
OUTLET BOX  
MOUNTING  
SLOTS  
BE SURE WALL  
HOLE IS  
PLUGGED  
TERMINAL  
SCREWS  
MOUNTING  
SLOTS  
1
137421A,B,D WALLPLATE  
SPIRIT  
LEVEL  
LEVELING  
POSTS (2)  
SCREWS (3)  
2
T87F  
1
2
IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION  
SHOWN, BUT FASTEN WITH SCREWS THROUGH "A".  
OPENING FOR  
THERMOSTAT  
WIRING  
USE 137421A,B WALLPLATE FOR HEAT OR COOL APPLICATIONS  
WITHOUT SWITCHING. USE Q539 SUBBASE FOR HEAT OR COOL  
APPLICATIONS WITH SWITCHING.  
MOUNTING  
SLOTS  
M20774  
M20772  
Fig. 1. Level 104456B, 137421A,B,D Wallplates.  
Fig. 3. Mount T87F, Q539 Subbase or 137421 Wallplate to  
outlet box.  
104456B WALLPLATE  
WIRING  
THERMOSTAT  
CABLE OPENING  
T87F  
CAUTION  
Voltage Hazard.  
Can cause electrical shock or equipment damage.  
Disconnect power before beginning installation.  
MOUNTING  
SLOTS (4)  
IMPORTANT  
All wiring must comply with local electrical codes and  
ordinances.  
THERMOSTAT  
COVER RING  
The T87F may be used in most 2- or 3-wire, spst or spdt, 24  
Vac to 30 Vac heating systems controlled by a low voltage  
thermostat. The following wiring diagrams represent typical  
applications.  
THERMOSTAT  
COVER RING  
M20773  
Fig. 2. Mount T87F, 104456B Wallplate.  
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T87F THERMOSTATS  
T87F  
T87F  
TEMPERATURE FALL  
TEMPERATURE FALL  
THERMOSTAT  
THERMOSTAT  
Y1  
Y1  
1
1
W1  
W1  
ADJUSTABLE  
HEAT  
ANTICIPATOR  
ADJUSTABLE  
HEAT  
ANTICIPATOR  
3
3
R1  
R
R1  
R
1
04456B  
1
37421A,B  
WALLPLATE  
WALLPLATE  
2
W
Y
2
W
COOLING  
ANTICIPATOR  
TO SYSTEM CONNECTIONS  
TO SYSTEM CONNECTIONS  
HEATING ONLY THERMOSTAT  
TRADELINE THERMOSTAT  
1
2
3
MODEL WITH POSITIVE OFF SWITCH OPENS THE THERMOSTAT CIRCUIT  
WHEN SETPOINT DIAL IS MOVED TO THE OFF POSITION.  
1
2
3
MODEL WITH POSITIVE OFF SWITCH OPENS THE THERMOSTAT  
CIRCUIT WHEN SETPOINT DIAL IS MOVED TO THE OFF POSITION.  
MAKE SYSTEM WIRING CONNECTIONS TO TERMINALS ON 104456B  
WALLPLATE.  
MAKE SYSTEM WIRING CONNECTIONS TO TERMINALS ON 137421A,B  
WALLPLATE.  
R1, W1 TERMINALS ON THERMOSTAT ARE DIRECTLY CONNECTED TO  
R, W TERMINALS ON WALLPLATE WHEN THERMOSTAT IS MOUNTED  
R1, W1, Y1 TERMINALS ON THERMOSTAT ARE DIRECTLY CONNECTED TO  
ON WALLPLATE.  
R, W, Y TERMINALS ON WALLPLATE WHEN THERMOSTAT IS MOUNTED  
M18011  
ON WALLPLATE.  
M20776  
Fig. 4. Internal wiring for T87F Heating Only Thermostat.  
Fig. 6. Internal wiring for Tradeline® T87F Thermostat.  
T87F  
L1  
(HOT)  
TEMPERATURE RISE  
THERMOSTAT  
Y
R
L2  
1
THERMOSTAT  
Y1  
COOLING  
CONTACTOR COIL  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
W1  
M6101  
3
Fig. 7. Typical wiring for T87F used as a Cooling Only  
Thermostat.  
COOLING  
R1  
R
ANTICIPATOR  
1
37421D  
WALLPLATE  
Y
2
TO SYSTEM CONNECTIONS  
COOLING ONLY THERMOSTAT  
1
2
3
MODEL WITH POSITIVE OFF SWITCH OPENS THE THERMOSTAT  
CIRCUIT WHEN SETPOINT DIAL IS MOVED TO THE OFF POSITION.  
MAKE SYSTEM WIRING CONNECTIONS TO TERMINALS ON 137421D  
WALLPLATE.  
R1, W1 TERMINALS ON THERMOSTAT ARE DIRECTLY CONNECTED TO  
R, Y TERMINALS ON WALLPLATE WHEN THERMOSTAT IS MOUNTED  
ON WALLPLATE.  
M20775  
Fig. 5. Internal wiring for T87F Cooling Only Thermostat.  
5
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T87F THERMOSTATS  
COMBINATION FAN  
AND LIMIT CONTROL  
TRANSFORMER  
1
L1  
HOT)  
(
COOL  
POSITION  
THERMOSTAT  
L2  
L1  
(HOT)  
1
Y
R
REMOTE  
CHANGEOVER  
SWITCH  
W
COOLING  
CONTACTOR COIL  
FAN  
MOTOR  
L2  
HEAT  
POSITION  
BURNER  
MOTOR  
3
OIL VALVE  
OIL PRIMARY  
ISOLATING  
RELAY  
IGNITION  
THERMOSTAT  
Y
R8184G  
T
WHITE  
R
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
2
W
T
F
PROTECTION AS REQUIRED.  
M6104A  
ORANGE  
Fig. 10. T87F in heating-cooling application with remote  
mounted system changeover switch. (Use Q539 Subbase  
for switching at thermostat location.)  
F
BLACK  
CAD CELL  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
To Replace a Series 10 Thermostat  
To adapt the T87F to a series 10 three-wire heating system:  
1. Connect the wires from the thermostat (R and W) to the  
terminals on the three-wire primary (B and W). See Fig.  
11 and 12.  
2
R8184 PROTECTORELAY OIL PRIMARY CONTAINS  
INTERNAL TRANSFORMER  
3
CONNECT OIL VALVE, IF APPLICABLE.  
M6105A  
Fig. 8. T87F in typical oil heating system.  
NOTES:  
Some three-wire controls manufactured by other  
companies cannot be satisfactorily operated by a  
two-wire thermostat.  
COMBINATION FAN AND  
THERMOSTAT  
LIGHT CONTROLLER  
Before connecting the T87F to a three-wire con-  
trol, consult the manufacturer.  
R
LIMIT FAN  
W
Some Honeywell series 10 relays require an R-B  
jumper (see Fig. 11). These relays are:  
R114A,B  
R116  
R125  
R126  
R161  
R117  
R178  
R180  
R187A1,A4  
R190B1,B8  
L1  
HOT)  
L2  
1
GAS VALVE  
TRANSFORMER  
(
R117  
TH  
TH  
TR  
TR  
Relays or valves that do not require a jumper may  
retain a three-wire, low limit control as shown in  
Fig. 11. If the jumper is required, a two-wire con-  
trol must be used.  
FAN  
MOTOR  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
M6103  
A three-wire, open contact, high-limit control  
requires a jumper as shown in Fig. 12.  
Fig. 9. T87F in typical gas heating system.  
JUMPER  
MAY BE  
REQUIRED  
2-WIRE LOW LIMIT  
OPERATING CONTROL  
R
B
T87F  
Y
W
R
W
SERIES 10  
RELAY OR VALVE  
R
R
B
B
W
W
3
-WIRE LOW-LIMIT OPERATING  
CONTROL MAY BE RETAINED  
ONLY IF R-B JUMPER IS NOT  
REQUIRED ON RELAY OR VALVE  
M20777  
Fig. 11. T87F (replacing a series 10 thermostat) connected  
to a 2- or 3-wire low limit control.  
60-2222—3  
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T87F THERMOSTATS  
LOW LIMIT  
OPERATING CONTROL  
JUMPER  
B
W
R
B
TO THERMOSTAT  
SETTINGS AND CHECKOUT  
T87F  
CONNECTIONS ON  
SERIES 10 VALVE  
AT BURNER  
W
R
Y
R
W
Temperature Selection  
To select the desired temperature, turn the transparent dial  
until the desired point on the setting scale (top scale) is in line  
with the pointer.  
SERIES 10 OPEN  
CIRCUIT HIGH LIMIT  
M6102  
Fig. 12. T87F (replacing a series 10 thermostat) connected  
to a 3-wire open contact, high-limit control.  
On models with range stops the temperature range may be  
limited at either extreme. The left stop is for the low extreme,  
the right stop for the high extreme (see Fig. 14).  
To Replace a Series 20 Thermostat  
Tradeline® T87F Thermostats directly replace series 20 spdt  
thermostats, or thermostats in heating installations that  
require contact on both a rise and fall in temperature (see Fig.  
Heat Anticipator Adjustment  
The thermostat has an adjustable heat anticipator that must  
be set on the number that corresponds to the current rating of  
the primary control of the system (for example; gas valve, oil  
primary).  
13).  
137421A  
WALLPLATE  
SETTING SCALE  
LEVEL  
LEVEL  
ADJUSTABLE RANGE  
STOPS ON SOME MODELS  
Y
R
W
CALIBRATION NUT  
2
ROOM TEMPERATURE SCALE  
SERIES 20  
R
B
W
HEAT ANTICIPATOR INDICATOR  
CAPTIVE  
MOTOR OR VALVE  
MOUNTING  
SCREW (3)  
M19049  
TR  
TR  
Fig. 14. T87F interior detail.  
TRANSFORMER  
L1  
HOT)  
L2  
(
1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
MAKE CONNECTIONS AS SHOWN: R TO R, W TO B, Y TO W.  
M20778  
SCALE  
Fig. 13. Tradeline® T87F in Series 20 Heating Circuit.  
.15  
.
12  
To wire a series 20 thermostat:  
HOLE SUITABLE FOR  
PENCIL POINT  
TO MOVE INDICATOR  
HEAT  
ANTICIPATOR  
INDICATOR  
Series 20 Thermostat  
T87F Thermostat  
M1368A  
R
B
W
R
W
Y
Fig. 15. Adjust heat anticipator to match current rating of  
primary control.  
7
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T87F THERMOSTATS  
IMPORTANT  
7. Make certain that the equipment functions properly in  
When the T87F is used in a series 20 heating circuit  
response to the thermostat.  
(
requires contact on both a rise and fall in tempera-  
ture), set the anticipator indicator to 1.2.  
RECALIBRATION  
If the current rating is not known, proceed as follows:  
1.  
Connect an ac ammeter of appropriate range (for exam-  
ple; 0 to 2A) between the R and W terminals on the  
wallplate, or between R and W on the subbase.  
Let the system operate through the ammeter for at least  
one minute before taking the reading.  
IMPORTANT  
If the thermostat scaleplate moves (pointer is station-  
ary) when setting the temperature, the thermostat is  
a Group I model.  
2.  
3.  
4.  
If the scaleplate is stationary and the pointer moves,  
the thermostat is a Group II model.  
Set the heat anticipator to correspond to the ammeter  
reading (see Fig. 15).  
A slightly higher setting to obtain longer burner-on times  
The T87F is accurately calibrated at the factory under  
controlled conditions and no recalibration should be  
necessary. If it appears that the thermostat is out of  
calibration, make sure that it is level and is not subjected to  
radiant heat from the sun, radiators, or appliances.  
(
and fewer cycles per hour) may be desirable in sys-  
tems such as a one-pipe steam system. For example:  
if burner on-time is too short with a heater setting of  
0.4, adjust to the 0.45 setting and check the system  
operation, then  
adjust to the 0.5 setting and recheck until the desired  
burner-on time is obtained.  
Remove the thermostat cover ring so you can observe the  
mercury switch action. After a five- or ten-minute off-period  
(
with thermostat setting below the room temperature), slowly  
raise the setting until the switch just makes contact. If the  
thermometer pointer and setting indicator read the same the  
instant you see the switch make, no recalibration is  
OPERATION  
necessary. If recalibration is necessary, proceed as follows:  
1
.
.
Turn the setting dial a few degrees above the room tem-  
perature and remove the cover.  
CAUTION  
Equipment Damage Hazard.  
2
Slip the 104994 Calibration Wrench (available on  
request) onto the hex under the bimetal coil (see Fig.  
Improper installation can burn out thermostat heat  
anticipator.  
1
4).  
On systems using a low voltage gas valve, do not  
apply a jumper across the valve coil terminals.  
3
.
.
Hold the dial firmly, and turn the hex counterclockwise  
for Group I models and clockwise for Group II models,  
until the mercury breaks contact.  
To check thermostat operation:  
4
Turn the dial to a low setting so that the thermostat  
loses the heat it has gained from your hands and its  
own operation.  
1
.
.
Turn down the temperature setting to the lowest point.  
If the subbase is used, move the system switch to the  
HEAT position.  
2
5.  
6.  
7.  
Wait at least five minutes.  
3
.
.
Raise the temperature setting until the burner starts.  
Slowly turn the dial back. (The burner should stop when  
the dial has been turned down below the room tempera-  
ture.)  
Slowly turn the dial until the pointers read the same.  
Firmly hold the dial—carefully turning the hex clockwise  
for Group I models, counterclockwise for Group II mod-  
els—until the mercury switch slips to the heating contact  
end of the tube.  
4
5
.
.
If the T87F controls cooling, move the subbase system  
switch (if used) to COOL and lower the setting until the  
cooling equipment starts.  
8.  
Recheck the calibration, select the desired temperature  
and replace the cover.  
6
Raise the setting above the room temperature and the  
cooling system should shut down.  
NOTE: When the T87F provides cooling control, calibration  
for heating automatically calibrates for cooling.  
Automation and Control Solutions  
Honeywell  
985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
1
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
Printed in U.S.A. on recycled  
6
0-2222—3 G.H. Rev. 8-02  
paper containing at least 10%  
post-consumer paper fibers.  
www.honeywell.com/yourhome  

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