Carrier 69NT40-541-306 Operation And Service
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T-354 7–38Upper VPS:In order to replace the VPS, the panel must be removed and replaced with another upper fresh air panel equippedwith VPS.Upon installation, a new VPS assembly requires calibration as follows:1. Rotate the vent to the 0 CMH/ CFM position.2. Code select 45 will automatically be displayed. Press the Enter key and hold for five seconds.3. After the enter key has been pressed, the display will read CAL (for calibration).4. Press the ALT MODE key and hold for five seconds.5. After the calibration has been completed, Code 45 will display 0CMH / CFM.6. Calibrate sensor:a. Use a multi-meter set to 200k ohms. Connect lead to VPS connector.b. Turn the gear wheel on the motor all the way to the right (clockwise) until it stops.c. Adjust the gear wheel counter clockwise until the meter reads 6.5k ohms (approximately).d. Install the VPS slide door so that the door is flush against the bottom rail, the motor gear and the doorteeth are meshed, and the gear wheel does not move from the set position.7. Position slide assembly back on to studs and re-install two washers and two nuts that secure slide assembly.8. Stake the ends of the two studs on panel assembly with wire cutters so that nuts will not be easily re moved.9. Reinstall Partlow box assembly if equipped, or access panel.10. Reinstall condenser fan guard.If the optional DataCORDER battery pack is being used and the charge is too low to enable recording during thepower off period of less than thirty days, the pen tip will move to below the inner chart ring for the period when NOdata was recorded by the DataCORDER.If the power has been OFF for more than thirty days, the recorder will NOT re-synchronize (the chart will notadvance to present time), the pen tip will move to the currently recorded temperature, and the recorder will resumenormal temperature recording.7.25 ELECTRONIC TEMPERATURE RECORDERThe microprocessor based temperature recorder is designed to interface with the DataCORDER to log tempera-ture with time. The electronic recorder will automatically record the return air, supply air, or both, based on the set-ting of temperature controller configuration code CnF37, refer to Table 4–4. The recorder reads and records datafrom the Controller in present time, under normal operating conditions.The recorder will STOP when the power is OFF, and the pen tip will remain at the last recorded temperature on thechart. When power is applied and the power off period is less than thirty days, the recorder will retrieve the loggeddata from the DataCORDER for the power off period and record it onto the chart. Thereafter, the recorder willresume normal temperature recording.If the optional DataCORDER battery pack is being used and the charge is too low to enable recording during thepower off period of less than thirty days, the pen tip will move to below the inner chart ring for the period when NOdata was recorded by the DataCORDER.If the power has been OFF for more than thirty days, the recorder will NOT re-synchronize (the chart will notadvance to present time), the pen tip will move to the currently recorded temperature, and the recorder will resumenormal temperature recording. |
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