Honeywell T4098A Thermostat User Manual

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T4098A,B  
Deluxe Electric Heat Thermostats  
PRODUCT DATA  
FEATURES  
Controls both fan-forced and baseboard electric  
heaters.  
Temperature-responsive, vapor-filled dual diaphragm  
sensing element provides 2°F (1°C) sensitivity with  
minimum droop.  
Replaces virtually all standard wall-mounted line  
voltage thermostats.  
Includes long-lasting Micro Switch™ mechanism.  
Color-coded leads allow easy installation.  
Protective cover door opens to provide access to  
setpoint knob.  
Attractive sloped faceplate allows easy viewing of  
temperature.  
GENERAL  
Classic styling.  
The T4098A,B Deluxe Electric Heat Thermostats provide high  
performance line voltage direct control of resistance-rated  
electric heating equipment.  
CONTENTS  
General ...............................................................................  
Features ..............................................................................  
Specifications ......................................................................  
Ordering Information ...........................................................  
Installation ...........................................................................  
Settings and Adjustments ...................................................  
Checkout .............................................................................  
Operation ............................................................................  
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Copyright © 1996 Honeywell Inc.  
All Rights Reserved  
68-0146-3  
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T4098A,B DELUXE ELECTRIC HEAT THERMOSTATS  
Electrical Ratings (Noninductive Resistive Loads):  
SPECIFICATIONS  
2
2A at 120/208/240 Vac, 60 Hz.  
9A at 277 Vac, 60 Hz.  
1
IMPORTANT  
The Specifications given in this publication do not  
include normal manufacturing tolerances. Therefore,  
this unit may not exactly match the listed  
specifications. Also, this product is tested and  
calibrated under closely controlled conditions, and  
some minor differences in performance can be  
expected if those conditions are changed. For exact  
engineering specifications, contact your Honeywell  
sales representative.  
Wiring Connections:  
in. (150 mm) leads suitable for connecting to aluminum  
wiring if approved special service CO/ALR connectors are  
used.  
6
Sensing Element:  
Vapor-filled dual diaphragm.  
Setpoint Adjustment:  
Knurled knob on front of thermostat.  
TRADELINE® Models  
Differential:  
TRADELINE® models are selected and packaged to provide  
ease of stocking and handling and also maximum  
replacement value. See Table 1 for TRADELINE® model  
specifications.  
2°F (1°C), nonadjustable.  
Dimensions:  
See Figs. 1 and 2.  
Table 1.Thermostat Specifications.  
Temp.  
Mounting:  
Mount directly on vertical 2 x 4 in. outlet box, or on 4 x 4 in.  
outlet box using ring adapter (ordered separately).  
Model  
Rating  
F° (C°)  
Number Switching  
Finish  
Includes  
Approvals:  
T4098A Spst;  
makes  
50° to 90° Classic Cover  
(10° to 30°) beige or thermometer,  
Premier temperature  
White™ range stops,  
and locking  
Underwriters Laboratories Listed: File No. E47434, Guide  
No. XAPX.  
Canadian Standards Association Listed: File No. LR1322.  
Canadian Standards Association Performance Certified:  
C273.4.  
single line  
break on  
temperature  
fall.  
cover.  
Accessories:  
T4098B Dpst;  
makes  
50° to 90° Classic Cover  
(10° to 30°) beige or thermometer,  
Premier temperature  
White™ range stops,  
and locking  
2
72804A Range Stop and Locking Screw Assembly. Includes  
locking cover screws, Tinnerman clips, wrench, and range  
stops—two plastic pins to insert inside cover for field-  
selection of minimum and maximum temperature settings.  
double line  
break with  
setting knob  
in OFF  
cover.  
position.  
ORDERING INFORMATION  
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the  
TRADELINE® Catalog or price sheets for complete ordering number or specify.  
1
2
3
. Model number.  
. Switching.  
. Type of finish.  
If you have additional questions, need further information or would like to comment on our products or services, please write or  
phone:  
1
2
. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).  
. Home and Building Control Customer Relations  
Honeywell, 1885 Douglas Drive North  
Minneapolis, Minnesota 55422-4386  
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International sales and  
service offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico,  
Netherlands, Spain, Taiwan, United Kingdom, U.S.A.  
68-0146—3  
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T4098A,B DELUXE ELECTRIC HEAT THERMOSTATS  
FRONT VIEW  
SIDE VIEW  
2-5/8 (67)  
CAUTION  
1.  
Disconnect power supply to prevent electrical  
shock or equipment damage.  
2.  
If connecting with aluminum conductors, use CO/  
ALR solderless wire connectors to avoid fire  
hazard.  
2
-1/8  
3. Do not remove thermostat cover until wiring is  
complete to avoid damaging the sensing element.  
4
-1/2  
(
54)  
(
115)  
4-1/2  
(
115)  
Location  
Install a vertical outlet box that is used to mount the  
thermostat about 5 ft (1.5m) above the floor in an area with  
good air circulation at room temperature.  
2
-7/8 (73)  
1-3/4  
45)  
1
(25)  
M5790  
Do not install the thermostat where it may be affected by:  
(
drafts or dead spots behind doors, in corners or under  
cabinets.  
Fig. 1.T4098 dimensions in in. (mm).  
hot air from convectors.  
radiant heat from sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
RECYCLING NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Wiring and Mounting  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of an old control containing mercury in a  
sealed tube.  
CAUTION  
1. Handle the thermostat with care to avoid  
damaging the sensing element or control.  
Use a separate limit control in the heating  
appliance.  
2.  
L2  
2
T4098A  
INSTALLATION  
1
3
L1  
HOT)  
L1  
When Installing this Product…  
(
1
. Read these instructions carefully. Failure to follow these  
instructions could damage the product or cause a  
hazardous condition.  
T1  
2
. Check the ratings on the product to make sure the  
product is suitable for your application.  
3
. Installer must be a trained, experienced service  
technician.  
4
4
. After installation is complete, check out product  
operation as provided in these instructions.  
ELECTRIC  
HEATER  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
WARNING  
ELECTRICAL SHOCK HAZARD.  
Follow local codes and ordinances when installing this  
thermostat. Improper handling can cause serious  
injury or death.  
HIGH VOLTAGE CONTROL.  
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS  
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE  
HAZARD MAY RESULT.  
3
4
BREAKS AND REMAKES BELOW -31°F(-35°C); NORMALLY  
THERMALLY ACTIVATED. BREAKS ON A TEMPERATURE RISE;  
MAKES ON A TEMPERATURE FALL.  
USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.  
M5813B  
Fig. 2.Typical wiring connections for T4098A.  
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68-0146—3  
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T4098A,B DELUXE ELECTRIC HEAT THERMOSTATS  
L2  
2
T4098B  
1
WALL  
3
6
L1  
L1  
L2  
T2  
RED WIRE  
(HOT)  
5
THERMOSTAT  
BASE  
T1  
4
ELECTRIC  
HEATER  
OUTLET  
BOX  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS  
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE  
HAZARD MAY RESULT.  
3
BREAKS AND REMAKES BELOW -31°F(-35°C); NORMALLY  
THERMALLY ACTIVATED. BREAKS ON A TEMPERATURE RISE;  
MAKES ON A TEMPERATURE FALL.  
MOUNTING  
SCREWS (2)  
M5794  
4
5
6
USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.  
BREAKS AT POSITIVE OFF ONLY; NOT THERMALLY ACTIVATED.  
DO NOT CONNECT GROUNDED CONDUCTORS (NEUTRAL) ON  
Fig. 4. Mounting thermostat to outlet box.  
120V OR 277V CIRCUITS. INSULATE AND TAPE, OR CUT OFF  
RED WIRES IF UNUSED.  
M5814B  
New Applications  
Fig. 3.Typical wiring connections for T4098B.  
 Disconnect the power supply to prevent electrical shock  
or equipment damage. All wiring must comply with local  
electrical codes and ordinances.  
IMPORTANT  
 Run the line voltage wiring to the thermostat location.  
 Do not remove the T4098 Thermostat Cover. Using wire  
connectors approved for No. 12 wires, make line  
voltage connections directly to the leadwires on the  
thermostat. See Figs. 2 and 3 for typical wiring  
connections.  
 Prebend and push the solid wires into the outlet box.  
 While holding the thermostat base with one hand, use  
the other hand to remove the thermostat cover by  
grasping the bottom cover edge and pulling outward  
away from the thermostat base.  
If locking cover feature is desired, insert the locking  
cover clip in the thermostat base before mounting  
the thermostat on the wall. See Fig. 7.  
Replacement Applications  
 Disconnect power to thermostat to prevent electrical  
shock or equipment damage. All wiring must comply  
with local electrical codes and ordinances.  
 Remove the old thermostat from the wall; be careful not  
to damage the wiring insulation.  
 Mount the thermostat on the outlet box as shown in  
Fig. 4. Secure the thermostat by tightening the two  
mounting screws.  
 Check the old wire insulation for cracks, nicks or fraying.  
Apply approved electrical tape to insulate wires or  
replace wires as necessary.  
 Do not remove T4098 Thermostat Cover. Using wire  
connectors approved for No. 12 wires, make line  
voltage connections directly to the leadwires on the  
thermostat. See Figs. 2 and 3 for typical wiring  
connections.  
 Prebend and push the solid wires into the outlet box.  
 While holding the thermostat base with one hand, use  
the other hand to remove the thermostat cover by  
grasping the bottom cover edge and pulling outward  
away from the thermostat base.  
SETTINGS AND ADJUSTMENTS  
Calibration  
The T4098 Thermostats are calibrated at the factory using  
precise instruments under closely controlled conditions.  
Recalibration should not be necessary. Allow the thermostat  
to operate for several hours before checking the calibration.  
The T4098 Thermostat vapor-filled dual diaphragm sensing  
element is affected by barometric pressure and altitude.  
Temperature deviations of 1°F (0.5°C) are normal. If the  
thermostat is mounted in a suitable location (as instructed in  
the Location section) and still appears out of calibration,  
check calibration as follows.  
 Mount the thermostat on the outlet box as shown in  
Fig. 4. Secure the thermostat by tightening the two  
mounting screws.  
68-0146—3  
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T4098A,B DELUXE ELECTRIC HEAT THERMOSTATS  
Check Calibration  
 Turn the setting knob clockwise until the switch makes  
THERMOSTAT  
BASE  
(clicking sound). The heating equipment and fan start.  
 No recalibration is necessary if the thermostat switch  
makes with the thermostat setting at the same  
temperature as indicated on the thermometer.  
 If the thermostat setting differs from the thermometer,  
record the temperature difference and recalibrate as  
instructed in the Recalibration Procedure section.  
DUAL-DIAPHRAGM  
SENSING ELEMENT  
Recalibration Procedure  
 Note the temperature difference between the  
temperature setting and the thermometer.  
 Remove the thermostat cover.  
SETTING DIAL  
 With the thermostat cover removed, note the location of  
the temperature setting knob.  
 Remove the clear plastic knurled setting knob. See  
Fig. 5.  
 Turn the temperature setting dial the required number  
of degrees for calibration (so thermostat temperature  
setting and thermometer are the same).  
 Replace the knob on the setting dial.  
 Replace the thermostat cover and recheck the  
calibration.  
CLEAR PLASTIC  
KNURLED  
M5793  
SETTING KNOB  
Setting Range Stops  
Use the range stops (included) to limit the maximum and  
minimum temperatures that may be set.  
 Move the thermostat setting knob to the desired  
maximum temperature.  
Fig. 5. Calibrating thermostat.  
INSIDE VIEW  
OF THERMOSTAT  
COVER  
 Remove the thermostat cover.  
 Adjust the knob indicator tab between the range stop  
positions to prevent interference.  
 Insert the range stop pins in the desired positions on  
the back of the thermostat cover. See Fig. 6.  
 Make sure pins are completely seated before replacing  
the thermostat cover.  
 Replace the thermostat cover and check the range  
INSERT PINS INTO  
TEMPERATURE  
STOP POSITIONS.  
stops.  
Locking Cover  
The thermostat cover may be locked using the locking cover  
screws included. Locking the cover prevents unauthorized  
tampering of the thermostat temperature setting.  
 Remove the thermostat cover.  
 Insert the locking cover clip (included) into the slot on  
the back of thermostat base as shown in Fig. 7.  
 Using an Allen wrench, insert the locking cover screw  
into the clip. Secure the screw in place until it is flush  
with the thermostat base.  
M5800  
Fig. 6. Setting range stops.  
5
68-0146—3  
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T4098A,B DELUXE ELECTRIC HEAT THERMOSTATS  
THERMOSTAT  
BASE  
CHECKOUT  
LOCKING  
COVER  
CLIP  
IMPORTANT  
Make sure that all wiring connections are secure  
before beginning checkout.  
50  
70 90  
THERMOSTAT  
COVER  
After thermostat installation is complete, check operation as  
follows:  
60  
7
 Move the thermostat setting knob clockwise until the  
switch makes (clicking sound); the electric heater starts.  
 Move the setting knob fully counterclockwise; the switch  
breaks and the electric heater stops.  
0
50  
9 0  
 Allow the thermostat to operate for several hours to  
determine the appropriate temperature setting. Adjust  
the setting as necessary.  
°
F
OPERATION  
LOCKING  
The T4098 Thermostat provides precise temperature control  
of resistance-rated electric baseboard heating equipment with  
minimum droop. The T4098 controls room temperature within  
COVER SCREW  
2°F (1°C), regardless of the load of the baseboard heater.  
ALLEN WRENCH  
The vapor-filled dual diaphragm sensing element is more  
sensitive to temperature changes than a bimetal sensor. This  
accuracy, usually associated with low voltage thermostats, is  
now available for line voltage control.  
M5799  
Fig. 7. Locking cover.  
Electric heat thermostats are often affected by the heat  
generated in the control. Temperature control points may vary  
or droop 2° to 4°F (1° to 3°C) depending on the load demand;  
however, temperature settings are adjusted to provide offset.  
The T4098 provides precise control with minimum droop. This  
allows better control of room temperatures from day-to-night  
and season-to-season while saving energy.  
68-0146—3  
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68-0146—3  
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Home and Building Control  
Honeywell Inc.  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
Helping You Control Your World  
1
985 Douglas Drive North  
Golden Valley, MN 55422  
M2H 2C9  
Printed on recycled paper containing at  
least 10%post-consumer paper fibers.  
68-0146—3 C.H. Rev. 4-96 Printed in U.S.A.  
www.honeywell.com/building/components  

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