Thermo King T-500R Maintenance Manual page 110

Zone 1 Display
Manual Zone Selection Mode
Manual Zone Selection mode allows the operator to select a desired zone when the Standard Display is being shown. Once a
zone is selected, the zone can be turned on or off, the zone setpoint can be changed or a manual defrost cycle can be initiated. To
manually select a zone when the Standard Display is being shown, press the Enter Key once. A decimal point will be
illuminated to the right of the Zone 1 horizontal bar. This indicates that Manual Zone Selection MODE is active. The unit will
remain in Manual Zone Selection MODE for 30 seconds after the last key press.
Decimal Point
When Manual Zone Selection MODE is active, pressing the Enter Key manually scrolls through the zones. When the desired
zone is shown on the display, operation of that zone can be changed as required.
• The selected zone can be turned on or off.
• The selected zone setpoint can be changed.
• A manual defrost cycle can be initiated in the selected zone if zone conditions permit.
Turning Zones On and Off
Each configured zone can be individually turned on or off. The On and Off state for each zone is maintained even if the unit is
turned off and back on. For example, if Zone 2 is turned off and the unit is then turned off and back on, Zone 2 will still be off.
IMPORTANT: At least one zone must be turned on. If all configured zones but one are turned off, the controller will not allow
the last zone to be turned off.
IMPORTANT: Unlike trailer unit applications, Zone 1 can be turned off without affecting unit operation, so long as at least one
other zone is turned on.
From the Standard Display, press the Enter Key to put the unit in Manual Zone Selection mode. Press the Enter Key again as
required to select the desired zone.
Zone 2 Selected
When the desired zone is selected, simultaneously press the ON Key and ENTER Key to turn the zone off. The box temperature
and setpoint show all dashes to indicate the zone is turned off.
Dashes Indicate Zone is Off
Simultaneously pressing the ON Key and ENTER Key again will turn the selected zone back on
Simultaneously Press ON Key and ENTER Key
Operating Instructions Standard HMI 7-8