Thermo King T-500R Maintenance Manual page 109

When the desired setpoint has been selected using the UP ARROW Key or DOWN ARROW Key, the ENTER Key must be
pressed to confirm and load the new setpoint.
• If the setpoint is changed using the UP ARROW Key and DOWN ARROW Key, the setpoint display will begin to flash 10 seconds after the
last press of the UP ARROW or DOWN ARROW key as a reminder to press the ENTER Key.
• The setpoint display will flash for 10 additional seconds. If at the end of this time the ENTER Key still has not been pressed to complete the
setpoint change, the setpoint will return to the old setpoint and Alarm Code 127 Setpoint Not Entered will be set. The Alarm Icon will
appear in the display.
The new setpoint will remain on the display after the ENTER Key has been pressed.
Failure to confirm the new setpoint by pressing the ENTER Key within 20 seconds of changing the setpoint will result in no
setpoint change. In addition, Alarm Code 127 Setpoint Not Entered is set, to indicate that the setpoint change was started but
was not completed.
Notice that the setpoint has returned to the old setpoint of 2.0 C and the Alarm Icon has lighted indicating that Alarm Code 127
Setpoint Not Entered is set.
Important: If the setpoint is changed using the UP ARROW Key or DOWN ARROW Key, the change must be confirmed by
pressing the ENTER Key within 20 seconds of changing the setpoint.
• If the ENTER Key is pressed, the setpoint change made with the UP ARROW Key and/or DOWN ARROW Key is accepted, the setpoint is
changed, and the display returns to the Standard Display showing the new setpoint.
• If the ENTER Key is not pressed within 20seconds of making a change with the UP ARROW Key and/or DOWN ARROW Key, the
setpoint is not changed and the display returns to the Setpoint Display showing the old setpoint. Alarm Code 127 Setpoint Not Entered is set
and the Alarm Icon will appear on the display, to indicate that the setpoint change was started but not completed.
The Multi-Temperature Standard Display
The Standard Display is the default display that appears if no other display function is selected. The Standard Display shows the
current zone box and the temperature and setpoint of that zone.
Horizontal bars to the left of the box temperature are used to indicate the zone currently shown on the display. The box
temperature is that measured by the return air sensor. The box temperature and Box Temperature Icon are shown in the upper
display. The setpoint and Setpoint Icon are shown in the lower display. The box temperature is -22.3°C with a -23°C setpoint.
Box Temperature and Box Temperature Icon, Setpoint Temperature and Setpoint Icon
IMPORTANT: If the unit is configured as a 2 zone unit, Zone 3 will still appear in Automatic Zone Scrolling and Manual Zone
Selection mode. However, Zone 3 is turned off and cannot be turned on.
If another display is shown, pressing the ON Key will return the display to the Standard Display.
Automatic Zone Scrolling
When the Standard Display is shown, the operating conditions for each zone will automatically be shown for 10 seconds. At
the end of that time, the next zone will appear on the display.
• If a zone is currently turned on, the box temperature and setpoint for that zone will be shown.
IMPORTANT: On TSR-2/TSR-3 Truck SPECTRUM Multi-Temperature units, Zone 1 can be turned off while the unit is running. The unit
will continue to run with Zone 1 turned off.
• If a zone is turned off, dashes will be shown instead of the box temperature and setpoint for that zone.
• If a zone is in defrost, the LED indicator next to the Defrost Key will be illuminated when that zone is shown on the display.
• If the unit is configured as a 2 zone unit, Zone 3 will still appear in Automatic Zone Scrolling. However, Zone 3 is turned off and cannot be
turned on.
• Unit operating conditions are shown by the LED indicators next to the Cycle Sentry Key, High Speed Lock-out Key and Pretrip Test Key.
Zone 1 is being shown as indicated by the single horizontal bar to the left of the box temperature. The box temperature of
-22.3°C and setpoint of -23°C indicate that Zone 1 is turned on. Since the Cycle Sentry LED is turned off, the unit operating in
Continuous Mode. The illuminated LED next to the High Speed Lock-out Key indicates that high speed operation is locked out.
The absence of the Alarm Icon indicated that no alarm conditions exist.
Alarm Icon and Setpoint
Operating Instructions Standard HMI 7-7