Carrier Supra 650 Operations Instructions download pdf (Page 12)

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9. Manual defrost key

The MANUAL DEFROST key places the unit in a defrost cycle. Under most conditions it is

not necessary to defrost the unit manually as this is done automatically with the air switch

or the defrost timer. Manual defrost may become necessary due to ice accumulated on the

evaporator coil during frequent door openings in humid environments.

10. Compartment 3 ON/OFF switch (multi temp only)

When switched on (I), the unit and compartment 3 will start in the operating mode last

entered (cooling or heating).

11. Buzzer Off key

The BUZZER OFF key temporarily turns off the FAULT ALARM buzzer. The red light

"Fault alarm" remains illuminated on the command cab.

12. Standby key

The STANDBY key places the unit in Standby (or electric) mode when the previous mode

of operation has been Road.

13. Pretrip Check key

The PRETRIP key initiates a check of all normal operating modes. The temperature inside

the box must be below 5°C ± 1°C (35°F ± 2°F) to start this check. Upon initiation, the unit

will cycle through all operating modes at 30 second intervals. The display will show

"PPPP" at the beginning and will show various unit data during the pre-trip cycle. Upon

completion of the pre-trip cycle the unit will be placed into the defrost mode.

14. Auto Start/Stop Continuous key

The AUTO-START/STOP key toggles the unit operating mode between Auto-Start/Stop

and continuous run. When the unit is set for Auto-Start/Stop operation, the unit will run

until the box temperature reaches set-point and then cycle off (after the minimum run time

has been met) until further cooling or heating is necessary. When in the continuous mode,

the unit will cycle between heat and cool as required to maintain the set temperature in the

body. If the setpoint is below –12°C (10°F) the unit will not heat, it will run continuously in

low speed cool.

15. Unit Data key

This key scrolls the display through the various operating condition displays, engine

temperature or battery voltage, for example. A more complete description of the function is

found later in this chapter.

16. Fault Alarm led : illuminates when an alarm is detected.

17. Enter key

The ENTER key confirms changes made to unit operation. It must be pressed to change

the setpoint after using the arrow keys to adjust it. If the ENTER key is not pressed, the

setpoint will revert to the previously entered setting.

The ENTER key must also be pressed whenever a FUNCTION setting is being altered. If

this key is not pressed, the function will revert to its previous setting.

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Carrier Supra 650 Operations Instructions Page 12