Honeywell T8034C User's Manual
Contents
1. With System switch set at Heat and Fan switch set at Auto move the temperature setting lever about 10 F 6 C above room temperature Gas or oil fired systems heating should start fan should start after a short delay Central electric heat or heat pump systems both heating and fan should start Move the temperature setting lever about 10 F 6 C below room temperature Gas or oil fired systems heating should shut off and fan should shut off after a short delay Electric heat or heat pump systems heating and fan should shut off Cooling CAUTION Equipment Damage Hazard Air conditioning equipment compressor can be damaged Do not operate cooling when outdoor temperature is below 50 F 10 C Refer to manufacturer s recommendations IMPORTANT To prevent compressor short cycling some manufacturer s equipment includes a minimum off timer to provide a five minute time delay from when the thermostat last turned off the compressor or from when the system first received power This delay protects the com pressor With the System switch set at Cool and the Fan switch set to Auto move the temperature setting lever about 10 F 6 C below room temperature Cooling and fan should start see Important above Move the temperature setting lever about 10 F 6 C above room temperature Cooling and fan should shut off Fan With the System switch set to Off and the Fan switch set to On the fan should run co2. ADELINE T8034C includes the 200581 Horizontal Wallplate For other T8043C models order the horizontal wallplate or mounting plate assembly If the horizontal wallplate is used align the thermostat and wallplate See Fig 2 Press firmly together until wallplate snaps in place then wire and mount the thermostat If the mounting plate assembly is used review the instructions provided with the assembly before wiring and mounting the thermostat To wire and mount the thermostat 1 In replacement applications check the existing thermostat wires for cracked or frayed insulation Replace any wires in poor condition If the wire is 69 1596 plastered into the wall make a hole next to the wires and loosen the wires so they can be pushed back into the wall later 2 In new installations run wiring if necessary to the thermostat location 3 Connect the wires to the terminals on the back of the thermostat See Fig 3 for internal schematic and typical hookup diagram 4 Remove thermostat cover by pulling outward on right edge of cover until it snaps free of the thermo stat base Carefully remove and discard the foam plastic shipping insert that protects the switch and bimetal assembly during shipping 5 Set the adjustable heat anticipator indicator to match the current draw of the primary heating con trol see Heat Anticipator Setting section 6 Push excess wire back through the hole and plug any opening with insulation to p
3. Honeywell T8034C Heating and Cooling Thermostat INSTALLATION INSTRUCTIONS APPLICATION The T8034C Thermostat see Fig 1 controls 24 to 30 Vac single stage heating cooling systems See Table 1 for application information An spdt mercury switch makes R to W on a temperature fall for heating and R to Y ona temperature rise for cooling Table 1 T8034C Specifications Switching Heat See Fig Model No Application Anticipation System Fan Comments No T8034C1085 For use in gas or 0 18A to 1 0A Heat Off On Auto TRADELINE 3 oil fired heating adjustable Cool systems MOUNTING HOLE BIMETAL ELEMENT Ch C U O C MERMOSTAT METAL ELEN D MERCURY NOTICE TO WALL OR ANTICIPATOR SYSTEM MOUNTING If this control is replacing a control that contains OUTLET BOX SWITCH HOLE A J sila mercury in a sealed tube do not place your old control in the trash Dispose of properly Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control INSTALLATION ven Installing This Product Read these instructions carefully Failure to follow ADIUSTASIE HERE TEMPERATURE them could damage the product or cause a hazard SETTING LEVER ous condition ANTICIPATOR INDICATOR M5601 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for Fig 1 T8034C internal view your application 3 In
4. ed control point on the temperature scale The same lever controls the temperature setting for either heating or cooling System and Fan Switching The T8034C has System and Fan switches to control the heating cooling systems and fan The System switch controls system operation Heat Operates only heating system Off Both heating and cooling systems are discon nected Cool Operates only cooling system The Fan switch controls fan operation Auto For gas or oil fired systems the fan operates in response to the thermostat in cooling and in response to the plenum fan control in heating For electric heat or heat pump systems the fan oper ates in response to the thermostat in both heating and cooling On The fan runs continuously To switch positions use thumb and index finger to slide lever to desired position Stop switch lever in detent directly over desired position Stop switch lever in detent directly over desired function indicator mark for correct circuit operation Heat Anticipator Setting IMPORTANT The T8034C Thermostat has an adjustable heat anticipator and operates correctly only if the anticipator is adjusted to match the current draw of the primary control Use this thermostat only on systems with current draw that falls within the range of the heat anticipator Do not use this device on Powerpile Systems millivolt Look for the current rating stamped on the nameplate of the primary control Set the ad
5. justable heat anticipator indicator to match the value shown on the nameplate If the current rating is not available proceed as follows to determine the rating 1 Turn off the power 2 Wire the thermostat but do not mount it on the wall 3 Connect the ammeter between the W wire and the W terminal on the thermostat in series with the pri mary control Prepare the system for operation Turn on the power Turn the System switch to Heat Increase the thermostat setpoint as necessary to begin operating the system With the system operating through the ammeter wait one minute then read the ammeter 9 Turn the System switch to Off and turn off the power 10 Adjust the heat anticipator to match the ammeter reading 11 Disconnect the ammeter reconnect the W wire and mount the thermostat NOP bd NOTE For best performance the heat anticipator may require further adjustment To lengthen burner on time move the indicator in the direction of the longer arrows but not more than one half scale marking at one time To shorten burner on time move the indicator in the opposite direc tion CHECKOUT CAUTION Equipment Damage Hazard Heat anticipator can be damaged Do not check operation by shorting across system control terminals IMPORTANT To assure accurate temperature control do not touch or breathe on bimetal or thermometer 69 1596 T8034C HEATING AND COOLING THERMOSTAT Heating
6. mercury rolls to the right end of the tube Remove the wrench and replace the cover IMPORTANT To assure accurate temperature control do not touch or breathe on bimetal or thermometer 3 Move the setting lever to a lower setting Wait at least five minutes for the temperature to stabilize 4 Slowly move the setting lever until it reads the same as the thermometer 5 Remove the cover Holding the setting lever so it does not move reinsert the wrench and carefully turn it counterclockwise just until the mercury rolls to the left end of the tube but no farther 6 Recheck the calibration Set the thermostat Sys tem switch for the desired operation 7 Adjust the temperature setting lever so the mercury bulb is in position as shown in Fig 4 8 Carefully replace the thermostat cover COIL SHOWN WITHOUT HEAT ANTICIPATOR CALIBRATION WRENCH M2044A Fig 4 Recalibrating the thermostat Honeywell Automation and Control Solutions Automation and Control Solutions Honeywell Limited Honeywell Limit e Honeywell 1985 Douglas Drive North Golden Valley MN 55422 35 Dynamic Drive Scarborough Ontario MIV 4Z9 Printed in U S A on recycled 69 1596 G H 12 01 paper containing at least 10 www honeywell com yourhome post consumer paper fibers
7. ntinuously Move the Fan switch to Auto In gas or oil fired systems fan operation is controlled by the plenum fan control in heating and by the thermostat in cooling In central electric heat and heat pump systems fan operation is controlled by the thermostat in both heating and cooling Recalibration These thermostats are calibrated at the factory and should not need recalibration If the thermostat seems out of adjustment first check for accurate leveling To check calibration 1 Move the temperature setting lever to the lower end of the temperature scale Place the System switch to the Off position Wait at least five min utes 2 Remove the thermostat cover Move the setting lever until the switch just makes contact The mer cury in the switch rolls to the left end of the tube 3 Replace the cover and wait five minutes for the cover and the thermostat to lose the heat it has gained from your hands If the thermometer pointer and the setting lever indicator read approximately the same no recalibration is needed If recalibration appears necessary 1 Place the temperature setting lever at the same setting as the thermometer Remove the cover by pulling out on the right edge of the cover until it snaps free of the thermostat base 2 Insert the 104994A Calibration Wrench ordered separately onto the hex nut under the coil See Fig 4 Holding the setting lever so it does not move turn the wrench clockwise until the
8. revent drafts that can affect thermostat performance 7 Loosely fasten the thermostat with wallplate if applicable to the wall or outlet box with a screw through the left mounting hole Adjust the thermo stat so it is approximately level and fasten the sec ond screw through the right mounting hole Do not tighten 8 For optimum performance level the thermostat using a spirit level or plumb line Tighten the mounting screws 9 Adjust temperature setting lever so mercury bulb is in horizontal position as shown in Fig 2 10 Carefully replace the thermostat cover IMPORTANT An incorrectly leveled thermostat causes the temperature control to deviate from setpoint a M20287 Fig 2 Mounting T8034C Thermostat on wallplate T8034C HEATING AND COOLING THERMOSTAT FAN SWITCH ka c1 on L1 HOT FAN RELAY L2 TEMP FALL H1 ANTICIPATOR C1 ANTICIPATOR SYSTEM SWITCH COOL _ HEAT X COOL RELAY 1 1 1 T 1 1 1 1 1 1 1 1 1 QPO OFF N A OFF HEAT _ A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A IN SINGLE TRANSFORMER SYSTEMS JUMP RC AND RH a O COOL M2043C Fig 3 Internal schematic and typical hookup for T8034C1085 in dual transformer heating cooling systems SETTINGS AND ADJUSTMENTS Temperature Setting Push the temperature setting lever to the desir
9. staller must be a trained experienced service technician 4 After installation is complete check out the product operation as provided in these instructions U S Registered Trademark l I I ll Copyright 2001 Honeywell oh All Rights Reserved 69 1596 T8034C HEATING AND COOLING THERMOSTAT Location Locate the thermostat about 5 ft 1 5m above the floor on an inside wall in an area with good air circulation at average temperature Do not mount the thermostat where it can be affected by drafts or dead spots behind doors or in corner hot or cold air from ducts radiant heat from the sun fireplaces or appliances unheated uncooled areas such as outside walls behind the thermostats This thermostat is a precision instrument and was carefully adjusted at the factory Handle it carefully Wiring and Mounting CAUTION Electrical Shock Hazard Can cause personal electrical shock and equipment damage Disconnect power supply before beginning installation IMPORTANT All wiring must comply with local codes and ordinances The T8034C can be mounted directly on a wall or horizontal outlet box Use the 200581 beige or 202895A gray Horizontal Wallplate to cover mounting marks from an old thermostat Use the 19312A beige or 202689A gray Mounting Plate Assembly to mount on vertical outlet box or to cover wall marks where larger plate is needed The SUPER TR
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