Assessments - 1, GPA: 5
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The cooling equipment and the fan should shut off. Operate the entire cooling system at least one complete cycle. If thermostat fails any test, refer to the Troubleshooting Guide in the Owner’s Manual. Reset both temperature setting levers to the desired temperatures. HEATING/COOLING SYSTEM Turn on power to the furnace and cooling system. Place the system switch lever to HEAT and fan switch lever to AUTO. Push both temperature setting levers together at least 5° F [3° C] above room temperature. The main burner should come on. The fan will start when the furnace heats up. (If central electric heat, fan coil or heat pump system, fan starts immediately.) Move both levers 5° F [3° C] below room temperature. The burner should shut off. Place the system switch lever to COOL and the fan switch lever to AUTO. The cooling equipment will operate, and the fan will start. Allow for any time delay that may be built into the compressor control circuit. 69-0642—1 6 NOTE: To avoid compressor damage, do not operate the NOTE: To avoid compressor damage, do not operate the Refer to manufacturer recommendations. Move both temperature setting levers together at least 5° F [3° C] above the room temperature. The cooling equipment should shut off. Place the fan switch to ON. The fan should run continuously with the system switch in any position. Place the system switch to OFF. Move both temperature setting levers to various positions. The heating and cooling systems should not operate. Operate the entire system for at least one complete cycle with the system switch at COOL and one complete cycle with the switch at HEAT. If thermostat fails any test, refer to the Troubleshooting Guide in the Owner’s Manual. Reset both temperature setting levers to the desired temperatures. Leave Owner’s Manual and Assistance Information in a convenient place for the building occupant or provide with other appliance manuals. Calibration THERMOMETER The thermometer in your thermostat was accurately calibrated at the factory. The thermometer should need adjustment only if it has been dropped or shifted due to mishandling. If the setpoint lever and the thermometer reading do not agree: 1. Remove the thermostat cover by pulling up from the bottom of cover until it clears the mounting slots. 2. Set the thermostat cover on a table near an accurate thermometer. 3. Allow five minutes for cover thermometer to sense area temperature; compare the readings. Be careful not to touch thermometer or breathe on it. 4. If the readings are the same, replace cover and put the system into operation. 5. If the readings are different, insert a small screwdriver in the thermometer and turn it until the thermometers have the same reading (Fig. 13). 6. Replace thermostat cover and put the system into operation. NOTE: Radiant heat from your hands will offset the thermometer reading. After making each adjustment, wait five or ten minutes for the thermometer to stabilize before comparing. THERMOSTAT This thermostat was calibrated at the factory and should not need recalibration in the field. If recalibration seems necessary, first be sure wallplate or subbase is accurately leveled. Then check thermometer calibration. To check thermostat calibration, allow several hours of operation after installation. Then read thermometer and remove cover. Push temperature levers together to a setting below room temperature. Slowly move them up the scale together until the mercury slides across the tube. If the thermometer reading and the high temperature lever position are approximately the same at the instant the mercury moves to the other end, no recalibration is needed. Fig. 13—Thermometer calibration. INCREASE M5128 If calibration is necessary, proceed as follows: 1. Remove the cover. 2. Place open-end calibration wrench, part no. 104994A (ordered separately), on the hex nut under the bimetallic coil controlled by the red lever (Fig. 14). Hold lever so it does not move, and gently turn the wrench clockwise until the mercury rests securely in the right end of the tube. 3. Put the thermostat cover on and wait ten minutes. 4. Read the thermometer. Then remove the cover. Moving both levers, place the HIGH lever at the thermometer reading. Hold lever so it does not move, and gently turn the wrench counterclockwise until the mercury just slides to the left end of the tube but no farther. Try to do this quickly so the heat from your hands does not affect the thermostat. 5. Repeat this procedure for the blue lever. Fig. 14—Use of 104994A calibration wrench. WRENCH ANTICIPATOR SETTING LEVER ANTICIPATOR SCALEPLATE .35 .30.25.20.10 M8583 CALIBRATION 7 69-0642—1 Typical Wiring Diagrams Fig. 15—Typical hookup for timer powered by separate 24-Vac transformer. L1 (HOT) L2 1 (HOT) C C R W HEAT RELAY TIMER 2 BATTERY THERMOSTAT SUBBASE L1 L2 1 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. BATTERY BACKUP MAY BE USED IF POWER TO TIMER IS INTERRUPTED. M822A Fig. 16—Typical ho...