Honeywell Home Theater System T498A User Manual

T498A,B  
Electric Heat Thermostats  
PRODUCT DATA  
FEATURES  
CSA Performance Certifled at 16A.  
CSA Certified, Underwriters Laboratories Inc. Listed  
up to 5 kW at 277 Vac.  
Long life, industrial-grade Micro Switch™ mechanism.  
Rugged, engineering plastic mounting base with  
captive mounting screws.  
Replaces any standard wall-mounted electric heat  
thermostat.  
Classic beige styling.  
Range: 40°F to 80°F (5°C to 25°C).  
Locking cover and range stops are optional.  
Energy efficient and economical.  
GENERAL  
The T498A,B Electric Heat Thermostats provide line voltage  
control of electric heating equipment. A snap action switch  
makes heating circuit on temperature fall.  
Contents  
General ...............................................................................1  
Features ..............................................................................1  
Specifications ...................................................................... 2  
Ordering Information ........................................................... 2  
Installation ...........................................................................3  
Setting and Checkout .......................................................... 4  
Security Features ................................................................ 4  
Calibration ...........................................................................5  
Copyright © 1996 Honeywell Inc.  
All Rights Reserved  
95C-10686-3  
 
T498A,B ELECTRIC HEAT THERMOSTATS  
1-1/4  
(33)  
Leave the cover on the thermostat while making  
connections.  
Push the leadwires into the outlet box and insert the  
thermostat into the box for mounting by pushing against  
the cover.  
1-1/32  
(26)  
5/8 (16)  
Remove the thermostat cover by grasping the top and  
bottom edges and pulling outward.  
Turn the dial so that the setpoint indicator is at the  
12 o’clock position. This will prevent accidental damage  
to the dial stop during mounting.  
Using a screwdriver, secure the thermostat to the outlet  
box by tightening the two mounting screws. Handle the  
thermostat with care; excessive pressure can damage  
the control knob or sensing element.  
OFF  
3-9/32  
(83)  
2-3/32  
(53)  
4-17/32  
(116)  
1/2 (13)  
M6089A  
CAUTION  
15/16  
(24)  
2-29/32 (72)  
1. Disconnect power supply before making wiring  
connections to prevent electrical shock or  
equipment damage.  
Fig. 1. Nominal dimensions in in. (mm).  
2. All wiring must comply with applicable codes and  
ordinances.  
RECYCLING NOTICE  
3
Thermostats are designed to be used with a  
separate limit control in the appliance.  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Using wire connectors approved for No. 12 wires, make  
line voltage wiring connections directly to the leadwires  
installed on the thermostat.  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of any control containing mercury in a  
sealed tube.  
CAUTION  
If connecting with aluminum conductors, use approved  
CO/ALR solderless wire connectors to avoid fire  
hazard.  
INSTALLATION  
L2  
2
T498A  
1
WARNING  
ELECTRICAL SHOCK HAZARD.  
3
L1  
L1  
HIGH VOLTAGE CONTROL.  
(HOT)  
This thermostat is a line voltage (120 to 277 volt)  
control. Do not install this thermostat if you are not  
completely familiar and competent with electrical  
wiring. If improperly handled, there can be risk of 120  
to 277 volt electric shock hazard that can cause  
serious injury or death.  
T1  
4
ELECTRIC  
HEATER  
Location  
Install a vertical outlet box that is used to mount the T498, four  
to five feet (1.5m) above the floor on an inside wall where the  
thermostat will be subjected to average room temperature.  
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
1
2
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS  
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE  
HAZARD MAY RESULT.  
Mount the thermostat away from concealed warm or cold water  
pipes, warm air ducts, light switches and dimmers, refrigerators  
or drafts from hallways, fireplaces, stairways or fans.  
3
4
BREAKS AND REMAKES BELOW -31°F(-35°C); NORMALLY  
THERMALLY ACTIVATED. BREAKS ON A TEMPERATURE RISE;  
MAKES ON A TEMPERATURE FALL.  
Mounting and Wiring  
USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.  
M6091A  
When replacing an old line voltage electric heating  
thermostat, remove the old thermostat carefully to avoid  
damaging the insulation on the wiring.  
Fig. 2.Typical hookup for T498A Thermostat.  
Check the old insulation for cracks, nicks, or fraying and apply  
approved electrical tape where necessary to achieve adequate  
insulation, or replace the wires using approved methods.  
3
95C-10686—3  
 
T498A,B ELECTRIC HEAT THERMOSTATS  
L2  
2
T498B  
1
6
3
L1  
L2  
T2  
L1  
(HOT)  
RED WIRE  
5
T1  
6
0
0
5
4
7
0
0
4
ELECTRIC  
HEATER  
OFF  
8
0
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
1
2
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS  
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE  
HAZARD MAY RESULT.  
°F  
BREAKS AND REMAKES BELOW -31°F(-35°C); NORMALLY  
THERMALLY ACTIVATED. BREAKS ON A TEMPERATURE RISE;  
MAKES ON A TEMPERATURE FALL.  
3
50 60 70 80 90  
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  
120V OR 277V CIRCUITS. INSULATE AND TAPE, OR CUT OFF  
RED WIRES IF UNUSED.  
M6092A  
M7236  
Fig. 3.Typical hookup for T498B Thermostat.  
Fig. 4. Locking cover installation.  
SETTING AND CHECKOUT  
IMPORTANT  
Range Stops  
Make sure all wiring connections are tight.  
Set the thermostat to the desired setpoint. Remove the  
cover.  
After the thermostat has been installed and wired, simulate  
normal operation as follows.  
Turn the setting dial completely clockwise. The electric  
heater should start to heat.  
Turn the dial completely counterclockwise. The power  
circuit should be broken and the electric heater should  
start to cool.  
Install the plastic dowels (included) into the minimum  
and/or maximum range stop holes on the inside back of  
the cover. See Fig. 5.  
Replace the cover. Check the operation of the range  
stops.  
To determine the final setting, move the dial indicator to  
the 70°F (21°C) position on the scale. If the setting is  
not satisfactory after a minimum of two hours of  
thermostat operation, turn the dial indicator to raise or  
lower the temperature. Move the indicator only a few  
degrees each time an adjustment is necessary.  
RANGE STOP  
HOLES  
SECURITY FEATURES  
Locking Cover  
Remove cover by swinging up from the bottom edge of  
the thermostat.  
Insert the Tinnerman Speed Nut® (included) into the  
slot on the lower back of thermostat base. See Fig. 4.  
Insert the Allen screw into the Speed Nut until the  
screw head is flush with the lower edge of the  
thermostat base.  
Replace the thermostat cover and lock by removing the  
Allen screw until screw body protrudes through the  
cover hole.  
M7238  
To unlock the cover, insert the Allen screw into the  
thermostat base until the screw body clears the cover.  
Fig. 5. Range stop installation.  
95C-10686—3  
4
 
T498A,B ELECTRIC HEAT THERMOSTATS  
CALIBRATION  
The T498 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 calibration.  
Temperature deviations of 2°F (1°C) are normal. If the  
thermostat is mounted in a suitable location and still appears  
out of calibration, check calibration using the procedures that  
follow.  
6
0
0
5
7
0
8
0
Check Calibration  
Remove the thermostat cover and set it aside for  
several minutes. Radiant heat from your hands will  
affect the thermometer reading.  
Turn the setting dial clockwise until the switch makes  
(clicking sound) and the heating equipment and fan  
start.  
°F  
50 60 70 80 90  
No recalibration is necessary if the thermostat switch  
makes with the thermostat setting at the same  
temperature as indicated on the thermostat cover  
thermometer.  
If the thermostat setting differs from the thermometer,  
record the temperature difference and recalibrate as  
instructed in the Recalibration Procedure section.  
APPLY NEW INSERT DECAL  
M7237  
Fig. 6.Thermostat recalibration.  
Recalibration Procedure  
Note the temperature difference between the  
thermostat setting and the thermometer.  
Turn the setting dial clockwise until the switch makes  
(clicking sound).  
Remove the adhesive backing of the indicator decal  
provided.  
Carefully align the indicator mark on the decal with the  
correct temperature setting number on the cover. See  
Fig. 6.  
Using finger pressure, secure the realigned decal on  
the center of the knob.  
Wait five minutes and recheck the calibration.  
5
95C-10686—3  
 
95C-10686—3  
6
 
7
95C-10686—3  
 
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Golden Valley, Minnesota 55422  
Scarborough, Ontario M1V 4Z9  
95C-10686—3 C.H. Rev. 4-96  
 

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