T822C,E Cooling Thermostats Application Fig. 1—T822C in typical cooling application with fan relay. T822C,E Thermostats provide low voltage control of cooling systems. Both models have fixed cooling anticipators and are available with a positive OFF switch and temperature range stops. The T822E has ON-AUTO fan switching and OFF-AUTO system switching. T822C TEMP. RISE L1 (HOT) R L2 3 1 C1 O C1 ANTICIPATOR Recycling Notice Installation WHEN INSTALLING THIS PRODUCT... 1. Read these instructions carefully. Failure to follow 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. CAUTION Disconnect power supply before beginning installation to prevent electrical shock or equipment damage. LOCATION 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 form the sun, fireplaces, or appliances. —concealed pipes and chimneys. —unheated (uncooled) areas behind the thermostat such as an outside wall. FAN RELAY Y M3375 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. If you have questions, call Honeywell at 1-800-4681502. 2 COMPRESSOR RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CONNECT FAN TO O FOR CONTINUOUS FAN OPERATION. CONNECT FAN TO Y FOR FAN OPERATION WITH COOLING EQUIPMENT CYCLING. 3 POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL CIRCUIT SHUTOFF. DOES NOT REPLACE POWER SUPPLY DISCONNECT SWITCH. M1292A 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. T822C,E Thermostats are designed to be vertically mounted on a wall or an outlet box. 1. In replacement applications, check the existing thermostat 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 that 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 Figs. 1, 2, or 3 for internal schematics 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 shipping insert. This insert protects the switch and bimetal assembly during shipping. 5. Push excess wire back through the hole and plug any opening with insulation to prevent drafts that may affect thermostat performance. 6. Loosely fasten the thermostat to the wall or outlet box with a screw through the top mounting hole. Do not tighten. 7. 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. 8. Replace the thermostat cover. J. H. • Rev. 2-93 • 1 • ©Honeywell Inc. 1993 • Form Number 69-0548—2 69-0548—2 M3375 Fig. 3—T822E in typical cooling application. Fig. 2—T822C in typical cooling application. L1 1 (HOT) L2 T822C T822E TEMP. RISE TEMP. RISE L1 (HOT) R FAN SWITCH L2 R ON 1 C1 G C1 C1 ANTICIPATOR C1 ANTICIPATOR Y AUTO FAN RELAY SYSTEM SWITCH AUTO COMPRESSOR RELAY Y COMPRESSOR CONTACTOR OFF 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2305 M1293 Settings and Adjustment the switch will drop to the contact end of the tube. 3. Replace cover and wait five minutes for the cover and the thermostat to lose the heat it has gained from your hands. If the thermostat 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 coil. See Fig. 4. Holding the setting lever so it does not move, turn the wrench clockwise 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 counterclockwise 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. TEMPERATURE SETTING Move the temperature setting lever to the desired control point on the temperature scale. On positive OFF models, the control circuit is broken when the lever is moved to the extreme high end of the temperature scale. T822E FAN AND SYSTEM SWITCHING The fan switch controls fan operation as follows: AUTO— fan operates in response to the thermostat call for cooling. ON— fan operated continuously. The system switch controls system operations as follows: OFF—cooling control system is disabled. AUTO—cooling control system operates in response to the thermostat call for 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, 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 2 2. Move temperature setting lever about 10° F [6° C] below room temperature. Cooling and fan start immediately. 3. Move temperature setting lever about 10° F [6° C] above room temperature. Cooling and fan stop immediately. 4. Set T822E SYSTEM switch to AUTO and FAN switch to ON. Fan runs continuously. 5. Set T822E SYSTEM switch to OFF. Cooling control system is disabled. 6. Set temperature lever and T822E SYSTEM and FAN switches to the desired settings. Checkout CAUTION Do not check thermostat operation by shorting across system control terminals. This damages the thermostat heat anticipator. T822C,E COOLING THERMOSTATS CAUTION Fig. 4—Recalibration procedure. Do not operate cooling circuit if outdoor temperature is 50° F [10° C] below room temperature. Refer to air conditioner manufacturer recommendations. COIL SHOWN WITHOUT HEAT ANTICIPATOR NOTE: To prevent compressor short cycling, a minimum off-timer may be included to provide a five minute time delay before reactivating the compressor or after compressor receives power. 1. Set T822E SYSTEM switch to AUTO and FAN switch to AUTO. Fan and system operation are now controlled by the thermostat. CALIBRATION WRENCH M2044 3 69-0548—2 Home and Building Control Honeywell Internationl, Inc. 1985 Douglas Drive North Golden Valley, MN 55422 Home and Building Control Honeywell Limited—Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 4 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.