C7262A Sensor and Controller CARBON DIOXIDE/TEMPERATURE SENSOR PRODUCT DATA • Automatic Background Calibration (ABC) algorithm based on long-term evaluation reduces required typical zero-drift check maintenance. SPECIFICATIONS Models: C7262 Sensor. A stand-alone carbon dioxide (CO2) and temperature sensor with two jumper-adjustable CO2 outputs (one analog and one SPST relay). C7262A1008: Wall module with display. C7262A1016: Wall module without display. Dimensions: See Fig. 1. C7262A1008 C7262A1016 APPLICATION The C7262 Sensor is a stand-alone carbon dioxide (CO2) and temperature sensor for use in determining ventilation necessity with HVAC controllers. The C7262 measures the CO2 concentration and temperature in the ventilated space. The C7262 is used in ventilation and air conditioning systems to control the amount of fresh outdoor air supplied to maintain acceptable levels of CO2 in the space and to sense the temperature of the space. FEATURES • Used for CO2 based ventilation control. • Integral 20K ohm NTC temperature output. • Models available with LCD that provides CO2 ppm level. • Non-Dispersion-Infrared (NDIR) technology used to measure carbon dioxide gas. • Device provides voltage or current output based on CO2 levels. • Models available with SPST relay output. Sensor Performance Ratings: Response Time: Less than 3 min. Carbon Dioxide Sensor: Operation: Non-dispersive infrared (NDIR). Sampling: Diffusion. CO2 Range: 0 to 2000 ppm Accuracy: ± (30 ppm + 3% of reading) from 59°F to 85°F (15°C to 30°C).* Temperature Sensor: Thermistor: 20K ohms NTC. Operating temperature range: 22°F to 122°F (-6°C to +50°C). * This product complies with Title 24 Part 6, CEC Standard for Residential and Non-Residential Buildings—2005, when installed according to instructions. Electrical Ratings: Power Supply: 24 Vac/dc ±20%, 50/60 Hz (Class 2). Maximum Power Consumption: 1W. Peak Current (20 ms duration): At rated voltages it is 120mA or less. Relay: Configuration: Shipped N.O. Contact Rating: 1A at 50 Vac/24 Vdc. Minimum Permissible Load: 1 mA at 5 Vdc. Linear Analog Output: Voltage: 0/2-10 Vdc (resistive load greater than 5000 ohms). Current: 0/4-20 mA (resistive load less than 500 ohms). Outputs (Jumper Adjustable, see Table 2): CO2 outputs 62-0353-03 C7262A SENSOR AND CONTROLLER INSTALLATION Analog: 0-10 Vdc (Default: 0-10 Vdc, 0 to 2000 ppm), 2-10 Vdc, 4-20mA. Relay: Normally Open SPST (Default: Close at 800 ppm). When Installing this Product... Ambient Ratings: Temperature: Operating: +32°F to +122°F (0°C to +50°C). Storage: -4°F to +158°F (-20°C to +70°C). Relative Humidity (non-condensing): 0 to 95 percent. 1. 2. CO2 Pressure Dependence: 1.6% change in reading per 1 kPa deviation from 100 kPa. 3. Wiring Connections: Terminals (16 gauge maximum) 4. Mounting: Vertical surface with standard single-gang junction box. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions. IMPORTANT All wiring must agree with applicable codes, ordinances and regulations. Automatic Background Calibration (ABC) default: On. Calibration: This product is factory calibrated. No field calibration is necessary for the life of this product. CAUTION Health Hazard. Approvals: CE Improper use can create dangerous situations. Use in application for sensing carbon dioxide and temperature only. For life-safety applications, this device can function only as a secondary or lesser device. 3 (76) CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. 4-13/16 (122) CAUTION Equipment Damage Hazard. Electrostatic discharge can short equipment circuitry. Ensure that you are properly grounded before handling the unit. C7262A Cover Removal/Replacement 7/8 (22) A snap-fit locking mechanism is used to attach the cover of the wall module to its subbase. To disassemble the cover from the subbase: M32567 Fig. 1. C7262A dimensions in inches (mm). ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 3. http://customer.honeywell.com or http://customer.honeywell.ca International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States. 62-0353—03 2 C7262A SENSOR AND CONTROLLER 1. 2. Insert a thin, flat blade screwdriver into each of the two slots at the bottom of the module to release the two locking tabs. Tilt the cover out and away from the subbase to release the top two locking tabs. CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. Location and Mounting CAUTION Equipment Damage Hazard. C7262 Sensors mount directly on the wall, sheet metal duct, or a panel. When planning the installation, allow enough clearance for maintenance and service. Mount the sensor in a well-ventilated area. NOTES: Electrostatic Discharge Can Short Equipment Circuitry. Ensure that you are properly grounded before handling the unit. Do not install the sensor where it can be affected by: — drafts or dead spots behind doors and in corners. —air from ducts. IMPORTANT 1. All low voltage connections to this device must be 24 Vac Class 2. 2. All wiring must comply with applicable local codes, ordinances and regulations. Sensor must be mounted in a location which sees at lease one 4-hour unoccupied period per week so that the CO2 level drops to outdoor levels. Automatic Background Calibration will not work properly in locations without four hours of unoccupied time per week, or where there are sources of CO2 other than people (breweries, mushroom farms, etc). Table 1. C7262 Terminal Connections (see Fig. 3). Designation Function V+ 24V Hot IMPORTANT This sensor is not for use in highly corrosive environments. Com AC/DC 24V Common for OUT1 and OUT2 TEMP 20k ohm NTC temperature output Wall Mounting OUT1: CO2 Analog Output, CO2 OUT2: CO2 Analog Output, CO2 TEMP The C7262 Wall Mount models can be mounted using two or four screws: 1. Remove C7262 cover. 2. Mount the subbase to the wall using washers and two or four screws (not supplied) appropriate for the wall material. RELAY NO COM AC/DC (CONVENIENCE) NOTE: When mounting on a junction box, see Fig. 2. 3. Normally Open potential free relay contacts RELAY NO V+ COM 24V AC/DC Replace the cover. TEMP TEMP COM AC/DC OUT1: OUT2: RELAY RELAY CO2 CO2 COM NO STANDARD UTILITY CONDUIT BOX NO. 6 SCREW COMMON FOR OUT1 AND OUT2 M33069A 24V Fig. 3. Wiring the C7262. FRONT COVER Input Signal SUBBASE NO. 6 SCREW The C7262 Sensors have an adjustable range. These ranges are determined by the SW1 and SW2 jumper settings (see Table 2). M32569A Fig. 2. Junction box mounting (C7262A). Table 2. CO2 Range Jumper Settings WIRING SW1a The factory ships the device with the output default settings shown in Tables 2 and 3. Set the jumpers and wire the device (see Table 1 and Fig. 3). 3 SW2a OUT1 & OUT2 (ppm) Relayb (ppm) On On 500 to 1500 1200 On Off 500 to 2000 1200 Off On 0 to 1000 1000 Offc Offc 0 to 2000 800 62-0353—03 C7262A SENSOR AND CONTROLLER Output Signal COM AC/DC V COM AC/DC SW1 ON and SW2 ON state means jumper is set in upper position and OFF state means jumper is set in lower position. b When the level reaches this value, the contacts close; when the level drops 100 ppm below this value, the contacts open. c Setting when shipped from the factory. RELAY COM a The output signal can be adjusted for 0/2-10 Vdc or 0/4-20 mA (see Table 3). Table 3. Output Signal Jumper Settings OUT 1 & OUT 2 AN OUT1 & OUT2 0-100% 20-100% Voltage 0-10Vdc 2-10Vdc Current 0-20 mA 4-20 mA NOTES: — — — Jumpers are shown on the sticker on the inside of the cover. Use needle nose pliers to carefully reposition jumpers. The CO2 settings and the output signal settings are independent of each other. 0-100% and 20-100% are simply markings for the OUT jumper settings on the sensor (to differentiate between the two voltage and the two current ranges) and do not refer to or alter the ppm range chosen. M33068A Fig. 4. C7262 default jumper settings. Example For a CO2 setting of 0-2000 ppm and a voltage output of 0-10 Vdc, the output would be as shown in Table 4 (arbitrary points along the analog curve). Table 4. 0-10 Vdc Output Example. CO2 Level (ppm) Voltage Output (Vdc) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 1 2 3 4 5 6 7 8 9 10 For a CO2 setting of 0-2000 ppm and a voltage output of 2-10 Vdc, the output would be as shown in Table 5 (arbitrary points along the analog curve). Table 5. 2-10 Vdc Output Example. CO2 Level (ppm) Voltage Output (Vdc) 0 250 500 750 1000 1250 1500 1750 2000 2 3 4 5 6 7 8 9 10 CHECKOUT Perform a quick test of the unit with the unit powered: 1. Stand close to the unit and breathe air into the sensor. 2. Check the CO2 level registered by the controller to ensure a strong rise. 3. When connected to a damper in a ventilation system, the controller typically signals an increase in air flow. Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U.S. Registered Trademark © 2012 Honeywell International Inc. 62-0353—03 J.J. 09-12 Printed in United States