Honeywell T498B User's Manual
Contents
1. 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 LI T498A B Red to L2 T498B only Electrical Rating Noninductive resistive rating 22A noninductive at 120 208 240 Vac 19A noninductive at 277 Vac ORDERING INFORMATION CSA Performance Certification 16A at 208 240 Vac Setpoint Adjustment Control knob on face of thermostat Sensing Element Flat bimetallic blade Differential Approximatel2. Honeywell T498A B Electric Heat Thermostats 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 Copyright 1996 Honeywell Inc e All Rights Reserved PRODUCT DATA FEATURES e CSA Performance Certifled at 16A e CSA Certified Underwriters Laboratories Inc Listed up to 5 kW at 277 Vac e Long life industrial grade Micro Switch mechanism Rugged engineering plastic mounting base with captive mounting screws e Replaces any standard wall mounted electric heat thermostat e Classic beige styling e Range 40 F to 80 F 5 C to 25 C e Locking cover and range stops are optional e Energy efficient and economical Contents A EHER e AATE ARE aa EAN ORSA 1 FOatUrOS ici ol 1 Specificatiohs messen 2 Ordering Information 24422444 sen nnnennnnnnnnennnnnnnennnnen 2 Installation caciones 3 Setting and Checkout 2u 20rsneennnensnnennnnnnnennnnnnnnennnnenn 4 Security Features uusnersnensnnensnnnnnnnnsnnnnnnnnnnnennnnnnnennnnen 4 Calibrations iii 5 95C 10686 3 7T498A B ELECTRIC HEAT THERMOSTATS 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
3. MPORTANT Make sure all wiring connections are tight After the thermostat has been installed and wired simulate normal operation as follows 0 O 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 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 SECURITY FEATURES Locking Cover 0 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 To unlock the cover insert the Allen screw into the thermostat base until the screw body clears the cover 95C 10686 3 Fig 4 Locking cover installation Range Stops O Set the thermostat to the desired setpoint Remove the cover Install the plastic dowels included int
4. approved for No 12 wires make line voltage wiring connections directly to the leadwires installed on the thermostat AN CAUTION If connecting with aluminum conductors use approved CO ALR solderless wire connectors to avoid fire hazard O ELECTRIC O HEATER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A USE SPECIAL SERVICE CO ALR SOLDERLESS CONNECTORS WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE HAZARD MAY RESULT A BREAKS AND REMAKES BELOW 31 F 35 C NORMALLY THERMALLY ACTIVATED BREAKS ON A TEMPERATURE RISE MAKES ON A TEMPERATURE FALL A USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE M6091A Fig 2 Typical hookup for T498A Thermostat 95C 10686 3 7498A B ELECTRIC HEAT THERMOSTATS HOT RED WIRE ELECTRIC HEATER O A 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 A BREAKS AND REMAKES BELOW 31 F 35 C NORMALLY THERMALLY ACTIVATED BREAKS ON A TEMPERATURE RISE MAKES ON A TEMPERATURE FALL A USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE A 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 Fig 3 Typical hookup for T498B Thermostat SETTING AND CHECKOUT I
5. lations Honeywell 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 429 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 95C 10686 3 L 1 1 4 gt 83 e 1 1 320 26 4 17 32 116 LE 2 29 32 72 a M6089A Fig 1 Nominal dimensions in in mm RECYCLING NOTICE If this control is replacing a control that contains mercury in a sealed tube do 7o place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of any control containing mercury in a sealed tube INSTALLATION A WARNING HIGH VOLTAGE CONTROL ELECTRICAL SHOCK HAZARD 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 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 Mount the thermostat away from concea
6. led warm or cold water pipes warm air ducts light switches and dimmers refrigerators or drafts from hallways fireplaces stairways or fans Mounting and Wiring When replacing an old line voltage electric heating thermostat remove the old thermostat carefully to avoid damaging the insulation on the wiring 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 7498A B ELECTRIC HEAT THERMOSTATS 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 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 O 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 AN CAUTION Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage 2 All wiring must comply with applicable codes and ordinances 3 Thermostats are designed to be used with a separate limit control in the appliance O Using wire connectors
7. mostat 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 eo 000 5 95C 10686 3 95C 10686 3 95C 10686 3 Honeywell Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley Minnesota 55422 Scarborough Ontario M1V 4Z9 Printed in U S A on recycled paper containing at least 10 post consumer paper fibers 95C 10686 3 C H Rev 4 96 www honeywell com yourhome
8. o 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 RANGE STOP HOLES M7238 Fig 5 Range stop installation 714984 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 1 follow lt Check Calibration Remove the thermostat cover and set it aside for several minutes Radiant heat from your hands will affect the thermometer reading O Turn the setting dial clockwise until the switch makes clicking sound and 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 thermostat cover thermometer Ifthe thermostat setting differs from the thermometer record the temperature difference and recalibrate as instructed in the Recalibration Procedure section APPLY NEW INSERT DECAL M7237 Recalibration Procedure Fig 6 Thermostat recalibration Note the temperature difference between the ther
9. y 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 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 2 Switching 3 Accessories if desired 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 Re
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