6–13 T-3663. Then go to Code Select Cd43 and arrow select “tESt” mode. Refer to Section 4.5.3.4. Select “tESt”. On selection a mechanical component operational test which is visual inspection, followed bya CO 2 calibration and O2 sensor check.Refer to Cd43 Test Mode described under Section 4.5.3 for description of mechanical and sensor tests.CAUTION!DO NOT RUN THE CAL SELECTION UNDER LOADED CONDITIONS5. On completion of the Cd43 test, prepare the box for an air leak test.6. Check the defrost drain hose for any damage and ensure that the trap is filled with water.7. Reinstall the upper back panel and ensure the floor drains within the container are sealed.8. Ensure the manual fresh air panel is closed tight and that the warning label is in place on the unit.Figure 6.19 Warning Label9. Check air tightness of the box following the Box Checkout/Leak Test procedure. Refer to Section 6.11.1.The box must meet or exceed the air tightness requirement.10.Load cargo, install the new curtain and select the desired O2 and CO2 levels via Code Select Cd43 “FrESh”modes. Refer to Section 4.5.1.11. Immediately after the cargo is loaded it is recommended to perform a second leak test on the box.6.11 CONTAINER PREPARATIONCheck the rear container doors and door handles for proper operating condition. Check for proper installation oflabels on the container and refrigeration unit. Always visually check the inside of the container for occupants priorto closing the doors.6.11.1 Box Checkout/Leak TestWhen using the XtendFRESH system, the box must conform to leak rates in order to maintain control of the O 2 andCO 2 setpoints. The minimal box requirement is a pressure decay of 2 inch WG (50mm) to 1 inch WG (25mm) ofeight minutes or more for a 40 foot container and four minutes or more for a 20 foot container. It is recommendedthat it be checked prior to the voyage.To perform this check some units may be equipped with two pressure connection ports on the front of the unit. Ifthe ports are not available then a Manual Fresh Air panel (part number 79-04098-00) with two Schrader portsshould be installed.