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Instruction Manual for Honeywell models including: C7100A Averaging Temperature Sensors, C7100A, Averaging Temperature Sensors, Temperature Sensors, Sensors
C7100D1001 Averaging Temperature Sensor 1097 Ohm
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DocumentDocumentC7100A,B,C,D Averaging Temperature Sensors APPLICATION The C7100A,B,C,D Averaging Temperature Sensors provide the input required by the W7080, W7100, Excel 500, and T775 Control Systems to sense temperature in discharge, hot deck, cold deck or return air. INSTALLATION INSTRUCTIONS 1-3/16 1-13/16 (30) (46) 3/4 13-1/4 (336) (19) 1-3/16 (30) 1-13/16 (46) M4461 Fig. 1. Approximate dimensions of C7100 Averaging Temperature Sensor in in. (mm). INSTALLATION Mounting 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. The sensor assembly (see Fig. 1) consists of an aluminum sensor probe (element housed internally) with attached flange that can bc mounted on a flat duct or plenum surface, or in a 2 by 4 in. (51 by 102 mm) junction box using four No. 8 screws. Connections to the sensor are made through two recessed 1/4 in. (6 mm) quick-connect terminals. Location The sensor should be located in the air duct or plenum where it will sample an average air temperature. Avoid locations where air stratification can cause sensor errors. Flat Duct or Plenum Surface Mounting (See Fig. 2) 1. Cut a 7/8 in. (22 mm) hole in the duct or plenum surface at the desired location. 2. Insert sensor probe into the duct or plenum with inlet holes facing the air stream. 3. If necessary, use the flange as a template to mark and drill four holes for No. 8 mounting screws. 4. Fasten the sensor to the duct or plenum surface with four No. 8 sheet metal screws (not provided). Junction Box Mounting (See Fig. 3) 1. Cut a 718 in. (22 mm) hole in the duct or plenum sulfate at the desired location. 2. Remove the center rear knockout from the junction box and insert the sensing probe through the knockout with the flange flat against the junction box. 3. Using the flange as a template, mark and drill four holes in the junction box and the duct or plenum surface for No. 8 mounting screws. 4. Insert sensor probe through both the junction box knockout and the 7/8 in. (22 mm) hole drilled in the duct or plenum and fasten the junction box and sensor to the duct or plenum surface. ® U.S. Registered Trademark Copyright © 2004 Honeywell International Inc. · All Rights Reserved 62-0214 C7100A,B,C,D AVERAGING TEMPERATURE SENSORS IMPORTANT All wiring must agree with applicable codes, ordinances and regulations. Connect low voltage wiring from the sensor to the appropriate system component terminals using 1/4 in. (6 mm) female quick-connectors at both ends. See Fig. 4 and 5. AIRSTREAM M21005 Fig. 2. C7100 duct or plenum mounting. MOUNTING HOLES (4) REAR 7/8 INCH KNOCKOUT 2 X 4 INCH JUNCTION BOX C7100 AVERAGING DISCHARGE SENSOR M21006 Fig. 3. C7100 junction box mounting. WIRING CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. CAUTION Erratic System Operation Hazard. Failure to follow proper wiring practices can introduce disruptive electrical interference (noise). Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts, and large power distribution panels. Shielded cable is required in installations where these guidelines cannot be met. Ground shield only to grounded controller case. W7081 LIMIT CONTROLLER ECONOMIZER/MIXED AIR LOW LIMITA5 1 23 456 TO H205 ENTHALPY CONTROLLER 55 50 60 NO JUMPER COLD DECK LOW LIMITA6 1 23 4 56 TO W7080 LOAD ANALYZER 55 45 60 NO JUMPER HOT DECK HIGH LIMITA7 1 23 456 90 110 130 NO JUMPER 24 Vdc 78 --+ C7100B MIXED AIR SENSOR C7100B COLD DECK SENSOR C7100B HOT DECK SENSOR M20050 Fig. 4. Connecting C7100B for economizer, mixed air and deck temperature sensing. C7100D 1 1 2 2 XF521A/XF526 1 AI 1 2 3 AI 2 4 5 AI 3 6 7 8 AI 4 9 10 AI 5 11 12 AI 6 13 14 AI 7 15 16 AI 8 17 18 +10V M2828 Fig. 5. Connecting C7100D to Excel 500 Control System. 62-0214 2 OPERATION AND CHECKOUT C7100A,B,C,D AVERAGING TEMPERATURE SENSORS Operation The C7100A,C,D Averaging Temperature Sensors consist of a platinum alloy resistance element, mounted in a tubular probe. The C7100B Averaging Temperature Sensor consists of a thermistor sensing element mounted in a tubular probe. They are applied at various locations throughout the systems. The probe has five shear-formed inlet openings that face into the air stream. The air entering these inlet openings is directed by the shear forms toward the sensor located within the probe. The probe mixes the various air samples entering the inlets to present an average temperature air sample to the sensing element. The sensing element resistance is therefore dependent on the average temperature of the sampled air. This method of temperature averaging provides more accurate temperature control by reducing or eliminating the effects of duct and/or plenum air stratification. Fig. 6 shows how the sensor resistance varies with temperature for a sensor having a positive temperature coefficient (PTC) of 4.8 ohms per degree F (8.6 ohms per degree C). Fig. 7 shows how thermistor resistance varies with temperature for a sensor having a negative temperature coefficient (NTC). Fig. 8 shows how sensor resistance varies with temperature for a sensor having a positive temperature coefficient (PTC) of 2.1 ohms per degree F (3.85 ohms per degree C). RESISTANCE (OHMS) 4200 4000 3800 3600 3400 3200 3484 ± 6.5 OHMS AT 77¡F (25¡C) F 20 40 60 80 100 120 140 160 180 200 220 -7 0 C 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (DEGREES) M2829 Fig. 6. C7100A,C Sensor resistance vs. temperature. 120K 100K RESISTANCE (OHMS) 80K 60K 40K 22,800 OHMS AT 77 F (25 C) 20K F 20 40 60 80 100 120 140 160 180 200 220 C -7 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (DEGREES) M3398 Fig. 7. C7100B Sensor resistance vs. temperature. RESISTANCE (OHMS) 1400 1317 1231 1145 1059 973 1097 ± 0.08 OHMS AT 77¡ F [25¡ C] F 20 40 60 80 100 120 140 160 180 200 220 -7 0 C 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (DEGREES) M2824 Fig. 8. C7100D Sensor resistance vs. temperature. Checkout Allow the C7100 Averaging Temperature Sensor to soak in the air moving through the duct or plenum for a minimum of ten minutes before taking a resistance measurement. 1. Disconnect the sensor leadwires from the associated system components. 2. Connect an ohmmeter across the leadwires. 3. Assure nominal resistance measurements are in accordance with the resistance/temperature curves (see Fig. 6 through 8). 4. Reconnect sensor leadwires to associated system components. 5. Check operation of the complete control system. 3 62-0214 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys' fees, arising out of, or resulting from, any modification to the literature by you. 62-0214 B.B. 11-04 www.honeywell.com