Carrier XtendFRESH, Operation, Service And Parts Manual

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4–1 T-366
SECTION 4
OPERATION
4.1 INTRODUCTION
This section addresses the operating requirements for the XtendFRESH
TM
Controlled Atmosphere option.
Operating parameters are not changed except for XtendFRESH settings. For information pertaining to the
operation of the refrigeration system, refer to the Operation and Service Manual for your particular model.
4.2 OPERATION
The XtendFRESH (FrESh) option is a modular option that offers enhanced functionality to help slow the ripening
process of perishable cargo by removing ethylene and simultaneously controlling CO
2
and O
2
levels in multiple
combinations. This enables the fresh transport of perishables on longer voyages. The system’s ability to control the
container atmosphere is performed with the use of a CO
2
Scrubber and a fresh air vent.
During the scrubbing process, CO
2
and ethylene are removed. The scrubber allows for the control of CO
2
based
on CO
2.
sensor input. The oxygen is controlled by the cargo’s natural respiration and by opening and closing sole-
noid operated air vents. An O
2
sensor monitors the level of O
2
and allows the system to prevent the O
2
levels from
dropping below the lower setpoint.
NOTICE
While the XtendFRESH option is operating, the process of inducing ripening by introducing
ethylene should not be performed.
4.3 PRE-TRIP INSPECTION
Pre-trip testing of the XtendFRESH option is performed via Function Code 43. During the pre-trip inspection, the
technician will verify operation by visual observation during this test. Refer to the Pre-Trip information in
Section
6.10 .
4.4 XTENDFRESH OPERATION
There are two function codes, Code 43 and Code 44, that assist with XtendFRESH operation. Code 43 contains
specific parameters for operation and Code 44 provides a visible display of component conditions.
4.5 CODE 43 (CD43)
4.5.1 Activate Fresh Mode to Start Up the System
In FrESh mode, all XtendFRESH operations are enabled and setpoints for CO
2
and O
2
can be edited.
1. Press the CODE SELECT key on the keypad.
2. Press the UP or DOWN arrow key until “Cd43“ is displayed, then press the ENTER key. The selection in the
right display will blink.
Cd43 is used to select a specific mode of operation and the associated parameters. The
modes of operation are: FrESh, OFF, and tESt. Within each of these modes of operation
are sub menus that have selectable parameters. Not all parameters are available in each
sub menu. When setting any mode of operation, the entire process must be followed to
ensure all parameters are set.