Carrier XtendFRESH, Operation, Service And Parts Manual

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6–5 T-366
Figure 6.6 O
2
Sensor
6.4.2 Replacing the Oxygen Sensor
1. Install the oxygen sensor by reversing the above steps.
6.5 CARBON DIOXIDE SENSOR
6.5.1 Removing the CO
2
Sensor
When replacing the CO
2
sensor it can be accessed in two ways: through the left-hand side evaporator access
panel or through the inside of the container by removing the upper back panel ( Figure 6.4 ). Refer to Figure 6.3 for
the physical location of the CO
2
sensor. Refer to Section 6.6 for procedures to remove and install the left access
panel.
WARNING
!
Potential hazardous atmosphere and low oxygen levels inside the container, ventilate before
entering. Stay away from doors while venting. Refer to
Section 4.7 .
WARNING
!
Before servicing unit, make sure the start-stop switch (ST) is in the OFF position. Unit circuit
breaker (CB-1) and external power sources are turned OFF and tagged to prevent accidental
energizing of circuits.
1. Follow container venting procedures before performing any maintenance on the CO
2
sensor.
2. Remove the electrical connector and the inlet and outlet tubes from the body of the sensor ( Figure 6.3 ).
3. Loosen the screws which holds the CO
2
sensor to the fan deck bracket.
4. Install replacement CO
2
sensor by reversing steps 2 and 3.
5. Calibrate the CO
2
sensor, following the test procedure. Refer to Section 4.5.3 .
Cushion Clamps
O Sensor
2