T498A,B ELECTRIC HEAT THERMOSTATS
95C-10686—3 2
SPECIFICATIONS
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.
Models:
T498A: Makes heating circuit on temperature fall. With
setting knob on extreme counterclockwise position,
provides single line break—spst (see Fig. 2).
T498B: Makes heating circuit on temperature fall. With
setting knob at OFF position, provides double line break
for fuse protected 240V heating circuits (see
Fig. 3). Remakes circuit no higher than -31°F (-35°C) in
OFF position. Both models available with a
thermometer located in the cover to indicate the actual
room temperature.
Setting Range:
40°F to 80°F, markings every 5°F.
Type of Switching:
Fully enclosed snap acting Micro Switch™.
T498A: Single line break (spst).
T498B: Spst with double line break (dpst in OFF position).
Wiring Connections:
Six inch (150 mm) stranded copper leadwires suitable for
connecting to aluminum wiring if approved special service
CO/ALR connectors are used. Color-coded Black to Ll
(T498A,B); Red to L2 (T498B only).
Electrical Rating (Noninductive (resistive) rating):
22A noninductive at 120/208/240 Vac.
19A noninductive at 277 Vac.
CSA Performance Certification:
16A at 208/240 Vac.
Setpoint Adjustment:
Control knob on face of thermostat.
Sensing Element:
Flat bimetallic blade.
Differential:
Approximately 3°F (2°C) nonadjustable.
Dimensions:
See Fig. 1 for nominal dimensions.
Thermometer:
Optional coil bimetal 50°F to 90°F (10°C to 30°C).
Mounting Means:
Direct mounting on NEMA standard vertical 2 x 4 inch
(50 mm x 100 mm) switch box, or 4 x 4 inch (100 mm x
100 mm) box with mud ring adapter (not provided) using
6-32 slotted Robertson™ screws.
Approval:
Underwriters Laboratories Listed: File No. E47434, Guide
No. XAPX.
CSA: File No. LR1322
Accesories (Not Included):
272804A Range Stop and Locking Screws 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.
272805H Replacement Cover Assembly: For T498B
Fahrenheit beige models (manufactured after
November, 1993—date coded after 9345).
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. Order Number. 3. Accessories, if desired.
2. Switching. 4. Order additional system components and system accessories
separately.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. 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.