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M22822 MODBUS EXHAUST AIR DISCHARGE AIR INDOOR FAN EXHAUST FAN M7215 MOTOR WITH W7345 ECONOMIZER LOGIC MODULE 1 1 1 Fig. 5. Representative Locations of Connected W7345 Economizer System Devices. 5 63-2569—04 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES WIRING 1. All wiring must comply with applicable local codes, ordinances and regulations. 2. Refer to Figures 6 and 7 for typical wiring diagrams. CAUTION 3. All inputs and outputs to the device must be 24 Vac Class 2. Electrical Shock or Equipment Damage Hazard. 4. Ensure proper polarity of sensor connections. Can shock individuals or short equipment Incorrect polarity negates the sensor signal. circuitry. Disconnect power supply before installation. NOTE: All connections with label designation ending in 1 (examples: TR1, P1) are ac/dc common connections. EXF PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. OPTIONAL REMOTE MINIMUM POSITION POTENTIOMETER. WHEN USING C7400 ENTHALPY SENSORS, CONNECT THE ENTHALPY SENSOR TO THE 1 2 3 3 3 2 B W MOD BUS CW CLOSE 2-10 Vdc FEEDBACK OUTPUT 2-10 Vdc CONTROL SIGNAL INPUT 2-10 Vdc FEEDBACK INPUT MIN POS/ DCV MIN POWER EXHAUST CONTACTOR MIXED AIR TEMP SENSOR 10K NTC OUTDOOR AIR TEMP SENSOR 10K NTC C7600C RETURN AIR HUMIDITY MAT A E B D C + – + – + – + – + – +– MOD BUS – MOD BUS + 1 – L1 L2 HUMIDITY SENSOR TERMINALS. LEAVE THE TEMPERATURE SENSOR TERMINALS EMPTY. M23875 Fig. 6. W7340 Typical Wiring. 63-2569—04 6 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Fig. 7. W7345 Typical Wiring. OPERATION The purpose of the economizer logic modules are to use outdoor air for cooling, whenever possible, to reduce compressor operation. IMPORTANT • Use C7400A sensor with W7340A or W7340B. • Use C7400C with W7340C. The W7340, when wired as shown in Fig. 6, responds to a signal from the Modbus. This system uses C7400 Solid State Enthalpy Changeover Sensor(s). The C7400 Enthalpy Sensors respond to both dry bulb temperature and humidity, allowing use of outdoor air at higher temperatures for free cooling when humidity is low. The logic module functions as a first stage of cooling and provides maximum fuel economy during the cooling cycle. The logic module automatically locks out free cooling during heating. It holds the outdoor air damper at the minimum position setting. The W7340 operates as a basic free cooling controller. Table 2 details the input/output (I/O) logic of the W7340. The logic module energizes the Unit Control and Indoor Fan contacts, and operates according to Table 2. SETTINGS AND ADJUSTMENT W7345 Potentiometers with screwdriver adjustment slots, located on the face of the device, provide adjustments for Minimum Damper Position parameters (See Fig. 8 for locations on device). MINIMUM DAMPER POSITION DRY BULB CHANGEOVER SETPOINT STATUS LED M23877 Fig. 8. Location of W7345 Potentiometers and LED. P P1 MBUS- MBUS+ TR1 24V COM TR 24V AC - MIN POS/ DVC MIN OPEN C B EA D MAT OAT RAT 7 63-2569—04 W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Potentiometers with screwdriver adjustment slots, located on the face of the device, provide adjustments for several parameters (See Fig. 9 for locations on device): — DCV minimum and minimum damper position. — Enthalpy changeover. — DCV setpoint. + - + - 2-10 VDC DAMPER POSITION 2-10 VDC DAMPER POSITION OVERRIDE MIN POS/ DCV MIN OPEN DCV SETPOINT MBUS- MBUS+ TR1 24V COM TR 24V AC C EA D MIN POS/DCV MIN DAMPER POSITION ExF ENTHALPY MAT CHANGEOVER SETPOINT + _ OAH OAT STATUS LED RAT DEMAND + B CONTROL _ RAH VENTILATION SETPOINT DCV 500 1500 P P1 M23878 Fig. 9. Location of W7340 potentiometers and LED. IMPORTANT Before powering the device read the following Enthalpy changeover setpoint guidelines: 1. Using the Enthalpy changeover setpoint, the setpoint can be adjusted until three minutes after powering the device. until three minutes after powering the device. 2. Through the Modbus, the Enthalpy changeover setpoint can be modified at any time. 3. If the Enthalpy changeover potentiometer is changed after the three minute power-up time, no change to the Enthalpy changeover setpoint will occur unless power is removed from the device then reapplied. NOTES: — The DCV setpoint can be changed at anytime by adjusting the pot. — For Enthalpy changeover setpoint see comments above. — MIN POS can be changed anytime by adjusting the pot. — DCV Min can be changed by procedure on page 4. Demand Control Ventilation (DCV) Setpoint The logic module modulates the outdoor damper to provide ventilation based on the 2-10 Vdc DCV sensor. With no cooling signal, DCV overrides the DCV minimum damper position when ventilation requires outdoor air. Table 2. W7340 Economizer I/O Logic. INPUTS OUTPUTS DCV Enthalpya Y1b Y2b Compressor Damper Outdoor Return Stage 1 Stage 2 Below set High Low On On On On Minimum positionOn Off On Off Low Hi...

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