Assessments - 3, GPA: 4.7
(
)
)
|
Facilidade de uso
• there is good air circulation. • it can measure true outdoor ambient temperature. • surface is flat. • wire distance between C7089 and thermostat is less than 200 feet. Do not mount the sensor: • in direct sunlight. • where hot or cold air blows on the sensor. Discharge line from an outdoor compressor unit, vent or fan causes inaccurate temperature readings. • where snow, ice or debris can cover it. Use the following steps to mount the sensor: 1. Remove the sensor from the mounting clip. 2. Mark the area on the location selected for mounting the sensor mounting clip. 3. Mount the clip. M7514 Fig. 1. Typical locations for outdoor sensor. ® U.S. Registered Trademark Copyright © 2004 Honeywell International Inc. . . All Rights Reserved 69-1709EFS C7089 OUTDOOR SENSOR C7089 OUTDOOR SENSOR CAUTION Electrical Interference (Noise) Hazard. Can cause erratic system operation. Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts and large power distribution panels. Use shielded cable to reduce interference when rerouting is not possible. IMPORTANT Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Avoid these practices to assure correct operation. Use shielded cable to reduce interference if rerouting of sensor wiring is not possible. . Be sure wires have a cable separate from the thermostat cable. . Do not route temperature sensor wiring with building power wiring, next to control contactors or near light dimming circuits, electric motors or welding equipment. . Avoid poor wiring connections. . Avoid intermittent or missing building earth ground. CAUTION Electrical Shock Hazard. Can cause electrical shock or equipment damage. Disconnect power supply before connecting wiring. Wiring must comply with applicable codes, ordinances and regulations: 1. Wire the C7089 Outdoor Sensor to S1 and S2 terminals on the thermostat. If leadwire provided with C7089 is not long enough (60 in.), run a cable to a hole at C7089 location. a. Using color-coded, 18-gauge thermostat wire is recommended. For example of general wiring of C7089, see Fig. 2. b. Pigtail wiring can be used. 2. Mount C7089 in its mounting clip. 3. Plug wiring hole using nonhardening caulk or putty. 2 1 C7089 WIRING HOLE THROUGH STRUCTURE 1 2 USE APPROPRIATE MOUNTING MEANS FOR THE TYPE OF STRUCTURE. PLUG WIRING HOLE WITH NON-HARDENING CAULK OR PUTTY. M19970 Fig. 2. Wiring C7089 Outdoor Sensor to thermostat. 69-1709EFS 2 C7089 OUTDOOR SENSOR C7089 OUTDOOR SENSOR Once installed and the Thermostat Installer Setup Number 0340 is set to 1 or 2, the outside temperature can be displayed on the thermostat. See Fig. 3. Heat On SCHEDHOLDCLOCKSCREENMOREMONTUEWEDTHUAM FANAUTOSYSTEMHEATFollowingScheduleOutside Set To M19971 Fig. 3. Outside temperature reading on TH8000 Series Thermostat. The C7089 Outdoor Sensor converts outdoor ambient temperature to a resistance that the thermostat can interpret. The C7089 has a negative temperature coefficient (TC), which means that resistance decreases as the temperature increases. See Table 1. CHECKOUT Allow C7089B Outdoor Sensor to absorb outdoor air for a minimum of twenty minutes before taking a reading. With an accurate thermometer (±1°F [0.5°C]) measure the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. To verify sensor resistance, remove one wire from one of the C7089 60-in. leadwires. Use an ohmmeter to measure the resistance across the sensor. Then verify the sensor accuracy with the temperature/resistance in Table 1. CALIBRATION The C7089 Outdoor Sensor is calibrated at the factory and cannot be recalibrated in the field. Table 1. Sensor Resistance at Outdoor Temperature . Outdoor Temperature Ohms of Resistance °F °C -20 -28.9 106926 -18 -27.8 100923 -16 -26.7 95310 -14 -25.6 90058 -12 -24.4 85124 -10 -23.3 80485 -8 -22.2 76137 -6 -21.1 72060 -4 -20.0 68237 -2 -18.9 64631 0 -17.8 61246 2 -16.7 58066 4 -15.6 55077 6 -14.4 53358 8 -13.3 49598 3 69-1709EFS C7089 OUTDOOR SENSOR C7089 OUTDOOR SENSOR istance (Continued). Table 1. Sensor Resistance at Outdoor Temperature (Continued). Outdoor Temperature Ohms of Outdoor Temperature °F °C Resistance °F °C 10 -12.2 47092 68 20.0 12081 12 -11.1 44732 70 21.1 11578 14 -10.0 42506 72 22.2 11100 16 -8.9 40394 74 23.3 10644 18 -7.8 3840076 24.4 10210 20 -6.7 36519 78 25.6 9795 22 -5.6 34743 80 26.7 9398 24 -4.4 33063 82 27.8 9020 26 -3.3 31475 84 28.9 8659 28 -2.2 29975 86 30.0 8315 30 -1.1 28558 88 31.1 7986 32 0.0 27219 90 32.2 7672 34 1.1 25949 92 33.3 7372 36 2.2 24749 94 34.4 7086 38 3.3 23613 96 35.6 6813 40 4.4 22537 98 36.7 6551 42 5.6 21516 100 37.8 6301 44 6.7 20546 102 38.9 6062 46 7.8 19626 104 40.0 5834 48 8.9 18754 106 41.1 5614 50 10.0 17926 108 42.2 5404 52 11.1 17136 110 43.3 5203 54 12.2 16387 112 44.4 5010 56 13.3 15675 114 45.6 4826 58 14.4 14999 116 46.7 4649 60 15.6 14356 118 47.8 4479 62 16.7 13743 120...