Controller Operation 7-13
3. When the correct setpoint shows in the lower display, press the ENTER key to load the new setpoint in the microprocessor
memory.
• “Lod” will appear in the lower display for a few seconds.
• The new setpoint will then appear. Check the setpoint shown in the display against the zone shown in the display to be
certain that the setpoint was changed for the correct zone.
• If the ENTER key is not pressed, the setpoint will NOT change and the display will return to the Standard Display in about
10 seconds.
THERMOGUARD ΜP-VI CONTROLLER
The µP-VI controller is a programmable microprocessor that controls all unit functions to maintain the cargo at the proper
temperature. The controller continuously monitors unit operational information including: Return air, discharge air, coil and
ambient temperature sensors; unit hourmeters; oil pressure; water temperature gauge; ammeter; voltmeter; tachometer; suction
pressure; discharge pressure; ETV position counter; mode indicators; and temperature control system controls.
WARNING: Make sure to turn the On/Off switch OFF before opening unit doors or inspecting or working on any part of the
unit. The unit may START automatically AT ANY TIME when the On/Off switch is in the ON position.
CAUTION: The Controller On/Off switch MUST be in the OFF position before disconnecting or connecting the unit battery.
NOTE: Refer to the appropriate Controller Operation and Diagnosis Manual for complete operation and diagnosis
information.
µP-VI Display Screen
1. Temperature Display (Upper Display)
2. Cool Symbol
3. Heat Symbol
4. Defrost Symbol
5. High Speed Symbol
6. Return Air Symbol
7. Discharge Air Symbol
8. Setpoint Display (Lower Display)
9. Setpoint Symbol
10. Electric Standby Symbol
11. In-range Symbol
12. Modulation Symbol
13. Alarm Symbol
14. Cycle-Sentry Symbol
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