Honeywell Thermostat T822D User's Manual
Contents
1. CATION Locate the thermostat about 5 ft 1 5 m 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 corners hot or cold air from ducts radiant heat from the sun fireplaces or appliances concealed pipes and chimneys unheated uncooled areas behind the thermostat such as an outside wall MOUNTING AND WIRING Disconnect power supply before beginning installation to prevent electrical shock or equipment damage All wiring must comply with local codes and ordinances T822D and TS822A Thermostats are designed to be mounted on a wall or on a vertical outlet box In a 250 or 500 mV application use No 14 wire if possible and make the run as short as possible remember this when select ing a location For maximum wire lengths in a 750 mV application see Table 1 TABLE 1 WIRE LENGTH Max Combined Wire Max Length Length Size 2 Wire Cable 2 Single Wires ft m ft m No 18 30 9 0 60 18 0 No 16 50 15 0 100 30 0 No 14 80 24 5 160 40 0 1 Inreplacement applications check the existing ther mostat wires for cracked or frayed insulation Replace any wires in poor condition If the wire is 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 insta2. Honeywell TRADELINE T822D TS822A Heating Thermostats Application The T882D two wire mercury switch thermostat pro vides low voltage control of heating systems and features an adjustable heat anticipator Some models include a positive OFF switch and temperature range stops The TS822A two wire mercury switch thermostat pro vides millivoltage control of heating systems and features a positive OFF switch Recycling Notice This control contains mercury in a sealed tube Do not place control in the trash at the end of its useful life If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to fol low them could damage the product or cause a hazardous condition 2 Check the ratings given in the Instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After installation is complete check out product operation as provided in these Instructions A CAUTION Disconnect power supply before beginning in stallation to prevent electrical shock or equip ment damage LO
3. NATE LIMIT CONTROL LOCATION A T822D T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN T822A HAS A FIXED HEAT ANTICIPATOR M1164B Fig 2 T822D in typical gas heating application T822A D T8022D TEMP FALL A ANTICIPATOR CONTROL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A T822D T8022D ADJUSTABLE HEAT ANTICIPATOR T822A HAS A FIXED HEAT ANTICIPATOR M1183A Fig 3 T822D in typical oil heating application T822A D T8022D TEMP FALL A L1 HOT OIL PRIMARY H1 ANTICIPATOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A T822D T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN T822A HAS A FIXED HEAT ANTICIPATOR M1184A Fig 4 TS822A in typical millivoltage heating application aad PILOTSTAT MILLIVOLTAGE CONTROL TEME BAe GAS CONTROL IF USED pang iggi MILLIVOLTAGE GENERATOR A CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS CONNECT R AND Y TERMINALS FOR 250 500 mV SYSTEMS A POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL CIRCUIT SHUTOFF DOES NOT REPLACE POWER SUPPLY DISCONNECT SWITCH M1311 8 With the system operating through the ammeter wait one minute then read the ammeter 9 Turn the system switch to OFF and turn off power 10 Adjust the heat anticipator to match the reading on the ammeter 11 Disconnect the ammeter reconnect the W wire and mount the thermostat Continue with s
4. llations run wiring if necessary to the thermostat location 3 Connect the wires to the terminals on the back of the thermostat See Figs 1 through 4 for internal schematic and typical hookup diagrams 4 Remove thermostat cover by pulling outward on bottom edge of cover until it snaps free of the thermostat base Carefully remove and discard the foam plastic ship ping insert This insert protects the switch and bimetal assembly during shipping 5 Set the adjustable heat anticipator indicator T822D only to match the current draw of the primary heating control see Heat Anticipator Setting 6 Push excess wire back through the hole and plug any opening with insulation to prevent drafts that may affect thermostat performance 7 Loosely fasten the thermostat to the wall or outlet box with a screw through the top mounting hole Adjust the thermostat so it is approximately level and start the second screw through the bottom mounting hole Do not tighten J H Rev 2 93 e e Honeywell Inc 1993 Form Number 69 0509 2 8 Level the thermostat exactly using a spirit level or plumb line Tighten the mounting screws IMPORTANT An incorrectly leveled thermostat will cause the temperature control to deviate from setpoint 9 Replace the thermostat cover Settings and Adjustments TEMPERATURE SETTING Move the temperature setting lever to the desired control point on the temperature scale On positive off models the con
5. 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 proceed as follows 1 Place the temperature setting lever at the same setting as the thermometer Remove cover 2 Insert 104994A Calibration Wrench order separately onto the hex nut under the foil See Fig 5 Holding the setting lever so it does not move turn the wrench clock wise until the switch just breaks contact Remove wrench and replace cover 3 Move the setting lever to a low setting Wait at least five minutes for temperature to stabilize 4 Slowly move the setting lever until it reads the same as the thermometer 5 Remove cover Holding the setting lever so it does not move reinsert wrench and carefully turn counterclock wise i until the mercury just rolls to the left end of the tube but no farther 6 Recheck calibration Set thermostat system switch for desired operation and replace cover Fig 5 Recalibration procedure COIL SHOWN WITHOUT HEAT ANTICIPATOR CALIBRATION WRENCH M2044 69 0509 2 Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 Printed in U S A on recycled paper containing at least 10 post consumer paper fibers Hone
6. trol circuit is broken when the lever is moved to the extreme low end of the temperature scale On models with temperature range stops temperature setting lever can be moved only between the two temperature range stops HEAT ANTICIPATOR SETTING T822D Only IMPORTANT This thermostat has an adjustable heat anticipator and will operate properly ONLY IF THE ANTICIPATOR IS ADJUSTED TO MATCH THE CURRENT DRAW OF THE PRIMARY CONTROL Use this thermostat only on systems with current draws that fall within the range of the heat anticipator Do not use device on Powerpile millivolt Systems A current rating is usually stamped in the nameplate of the primary control Set the adjustable heat anticipator indicator to match the value given on the nameplate If current rating is not available proceed as follows to determine the rating 1 Turn off power 2 Wire thermostat except for connection to W termi nal but do not mount it on the wall 3 Connect ammeter between W wire and W terminal on the thermostat 4 Prepare the system for operation 5 Turn on power 6 Turn system switch to heat 7 Increase thermostat setpoint as necessary to get sys tem operating Fig 1 T822D in typical electric heating application T822A D T8022D TEMP FALL LIMIT Po CONTROL H1 F Wey A H1 ANTICIPATOR ELECTRIC HEAT RELAY N A1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ALTER
7. ystem check out NOTE The heat anticipator may require further adjust ment for best performance To lengthen burner on time move the indicator in the direction of the longer arrows not more than one half scale marking at a time To shorten burner on time move indicator in opposite direction Checkout A CAUTION Do not check thermostat operation by shorting across system control terminals This damages the thermostat heat anticipator 1 Move temperature setting lever about 10 F 6 C above room temperature e Gas or oil heating systems Heating starts immedi ately Fan starts after short delay e Electric heating systems Heating and fan start immediately 2 Move temperature setting lever about 10 F 6 C below room temperature e Gas or oil heating systems Heating stops immedi ately Fan stops after a short delay e Electric heating systems Heating and fan stop immediately RECALIBRATION These thermostats are calibrated at the factory and should not need recalibration If the thermostat seems out of ad justment first check for accurate leveling To check cali bration proceed as follows 1 Move the temperature setting lever to the low end of the temperature scale 2 Remove the thermostat cover Move the setting lever until the switch just makes contact The mercury in the switch will drop to the contact end of the tube 3 Replace the cover and wait five minutes for the cover and the thermostat
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