Thermo King T-500R Maintenance Manual page 107

In Figure 1, Zone 1 is being shown on the display. The box temperature in Zone 1 is -22.3°C and the setpoint is -23°C.
In the screen in Figure 2, Zone 2 is being shown on the display. The box temperature in Zone 2 is 2.1°C and the setpoint is
1.7°C.
In Figure 3, Zone 3 is being shown on the display. The box temperature in Zone 3 is 9.3°C and the setpoint is 10°C. Zone 3 only
appears on units configured with 3 zones.
Turning the Unit On and Off
(UT-Series only): Verify the Base Controller On/Off Switch is turned on before turning on the HMI Control Panel. The Base
Controller On/Off switch is located on the outside of the control box side on of the unit. If the Standard Truck HMI Control
Panel is turned on and the Base Controller On/Off Switch is turned off, the HMI display screen will flash on and off.
The unit is turned on by pressing the ON Key and off by pressing the OFF Key. When the ON Key is pressed the display briefly
shows dashes as the display initializes.
When two horizontal bars are present at the left side of the box temperature, then Zone 2
is being shown on the display. The display will automatically scroll through all
configured zones, showing each zone for 10 seconds.
When three horizontal bar is present at the left side of the box temperature, then Zone 1 is
being shown on the display. The display will automatically scroll through all configured
zones, showing each zone for 10 seconds.
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.
ZONE 1
ZONE 2
ZONE 3
Keys and LED Indicators
Operating Instructions Standard HMI 7-5