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5–1
T-366
SECTION 5
TROUBLESHOOTING
5.1
ALARMS
Alarm display is an independent controller software function. If an operating parameter is outside of the expected
range or a component does not return a valid signal back to the controller, an alarm is generated. The Xtend-
FRESH
TM
Controlled Atmosphere option alarms are AL07, AL09, AL10, AL29, AL62 and AL96.
AL07
FRESH AIR VENT OPEN
Cause:
For units equipped with XtendFRESH and a Vent Position Sensor, the controller will monitor the
manual fresh air opening at a pre-determined time. If during this time the fresh air vent is open and
XtendFRESH is active, an alarm will be generated. If alarm is active, the controller monitors the
manual fresh air once per hour. Upon clearing the alarm, the controller goes back to monitoring at
the pre-determined time.
Component
Vent Position Sensor (VPS)
Troubleshooting
Manually reposition vent to 0% and confirm using Cd45. If Cd45 is not
reading 0%, perform a calibration of the panel. Refer to
If unable to obtain a zero reading, replace the defective VPS.
If unit is loaded, ensure vent is closed. Note and replace VPS on next PTI.
The alarm will not affect the XtendFRESH system from operating.
AL09
O
2
SENSOR FAILURE
Cause:
Triggered anytime the O
2
sensor reading is outside of the normal operation range, after an initial
signal was detected.
Component
O
2
Sensor, O
2
Amplifier, Sensor Switch Module (if equipped)
Troubleshooting
Check Cd44 and scroll down to 02V. The O
2
sensor output will be dis-
played in millivolts (130mV to 4100mV).
Switch equipped: If voltage is not present at Cd44 and a sensor switch
module is installed, check for O
2
voltage on the black wire connected to the
sensor switch module, connecting ground of meter to TP9. If the voltage is
in the 130mV to 4.1V range, directly wire the black wire to KD04. This may
cause an AL07 depending on O
2
reading but XtendFRESH will operate
normally. If no voltage on the black wire, proceed to next step.
Check wiring (refer to schematic), and correct if found mis-wired.
If O
2
sensor is available, remove the upper fresh air panel and evaporator
motor and replace the sensor. If after replacing sensor AL09 continues, re-
place amplifier.
If parts are not available, turn XtendFRESH option off (Cd43) and open the
Manual Fresh Air Vent.
Summary of Contents for XtendFRESH
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Page 42: ...T 366 7 2 Figure 7 1 PIDs NT2570 and NT2617 Schematic and Diagram...
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Page 45: ...7 5 T 366 Figure 7 4 PIDs NT2619 and NT2704 Schematic and Wiring Diagram...
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Page 47: ...7 7 T 366 Figure 7 6 PIDs NT2619 and NT2704 Diagram and Legend...
Page 48: ...Figure 7 7 PIDs NT2709 and NT2774 Schematic and Wiring Diagram...
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