Assessments - 3, GPA: 3.7
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Mount the device in a location protected from rain, snow, and direct sunlight. The logic module mounts on the side of an M7215 Damper Motor or directly on a sheet metal duct or panel. NOTE: Refer to Figures 4 and 5 for representative locations of connected system devices. CAUTION Equipment Damage Hazard. Mounting screws longer than 5/8 in. can damage internal motor components. When mounting the module to an M7215 use only the included #6 5/8 in. thread-forming screw. MOUNTING DIRECTLY TO THE MOTOR 1. Mount the motor. 2. Secure the W7340 or W7345 to the motor using the supplied mounting screw (See Fig. 2). MOUNTING SEPARATE FROM THE MOTOR Secure the device to the sheet metal using appropriate fasteners (not supplied)(See Fig. 3). M17550B ECONOMIZER LOGIC MODULE M7215 DAMPER MOTOR 5/8 INCH SCREW INCLUDED WITH LOGIC MODULE. Fig. 2. Mounting Economizer Logic Module on Damper Motor. 3 63-2569—04 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES M17638 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES M17638 Fig. 3. Mounting to a Duct or Panel. Enthalpy Sensor (W7340 only) To measure enthalpy, the logic module accepts signals from either: — C7600C Humidity and 10K NTC temperature sensors. — or a C7400 Enthalpy Sensor. IMPORTANT • When using C7400 Enthalpy Sensors, connect the enthalpy sensors to the humidity sensor terminals; leave the temperature sensor terminals empty. • Use C7400A sensor with W7340A or W7340B. • Use C7400C sensor with W7340C. OUTDOOR AIR SENSING 1. Mount each sensor in any orientation that exposes it to freely circulating air and protects it from rain, snow, and direct sunlight. 2. Connect it to the logic module. RETURN AIR SENSING 1. For differential enthalpy or temperature control mount a second sensor in the return air duct. 2. Connect it to the logic module. Demand Control Ventilation (DCV) Sensor Input (W7340 only) The DCV sensor can be any sensor that provides a 0-10 Vdc output over a range of 0 to 2000 ppm of CO2. The DCV signal modulates the outdoor damper to provide ventilation based on occupancy. Mount the sensor according to the manufacturer specifications. If not available, mount the sensor in an area with unobstructed air circulation. IMPORTANT • Ensure proper polarity of sensor connections. Incorrect polarity negates the sensor signal. W7340B: The W7340B DCV economizer logic modules incorporate a minimum position setting that defaults to 20%, but can be overridden using the Modbus communication link. The W7340B DCV maximum position sets the damper position to a position that the damper goes to if the CO2 sensor fails. If the minimum position set point is higher than the DCV maximum position, on sensor failure, the damper goes to the higher of the two DCV maximum and minimum position setting. There is no limit on the damper position on a call from the CO2 sensor (DCV); the damper can go 100% open. W7340C: The W7340C DCV economizer logic module has the ability to set DCV minimum damper position and minimum position. The DCV minimum position is set to ventilate the building contaminants and the minimum position is set to ventilate for the building contaminants and the building occupants. The installer sets the damper DCV minimum position and the minimum position based on the design occupancy and CFM of outdoor air requirements for the space. The damper will modulate open between the DCV minimum damper position and the minimum position based on input from a CO2 sensor. The damper will not drive 100% open on a call for ventilation, but can drive 100% open on a call for cooling. If the CO2 sensor fails the damper will drive to the minimum position ventilating for building contaminants and the building occupants. If the DCV minimum position has not been set using the following procedure, the default setting will be 50% of the minimum position setting. DCV Min and Min Position Damper Set Up Set up instructions for W7340C DCV damper positions: 1. Remove RAT sensor from RAT terminals. 2. Connect CO2 sensor to DCV terminals. 3. Apply power to economizer logic module. 4. Wait 10 to 15 seconds for the CO2 sensor to initialize. Short RAT terminals. 5. Remove CO2 sensor from DCV terminals. 6. DCV LED will blink 2 times. If LED does not blink, cut power to economizer logic and repeat steps 1-5. 7. Set DCV minimum position using MIN POS/DCV MIN potentiometer. 8. Remove RAT short. 9. DCV minimum position is saved to memory and DCV LED blinks 5 times. 10. Turn off power to economizer logic module. 11. Connect RAT sensor. 12. Turn power on to economizer logic module. 13. Set minimum position using MIN POS/DCV MIN potentiometer. IMPORTANT Steps 3-8 must be completed within 3 minutes after power up otherwise the configuration process will be terminated, no changes will be saved and you will need to repeat steps 1-13. 63-2569—04 4 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES 10K NTC DISCHARGE AIR SENSOR DIRECT EXPANSION COIL C7400 C7232 ENTHALPY SENSOR C7400 ENTHALPY SENSOR RETURN AIR OUTDOO...
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