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TK 61753-2-MM-EN
• Display and Change Setpoint
• Display and Initiate Defrost
• Display System Status of Engine, Refrigeration, Power and Control
• Display and Clear Alarms
The unit will operate in either Cycle-Sentry or Continuous Run mode of operation as selected by the operator using the
HMI Control Panel.
See “Operating Instructions” for more information about the A-Series Controller.
Operating Modes
The microprocessor uses a complex program to determine which operating mode the unit should be in. Therefore, it is
difficult to predict which operating mode the unit should be in by comparing the setpoint to the box temperature.
The diesel engine operates at either low speed or high speed as determined by the microprocessor. The unit will Cool
or Heat in either high or low speed. The unit will Defrost in low speed only. Heat and Defrost consists of hot gas
delivered to the evaporator coil distributor.
EEnnggiinnee OOppeerraattiioonn
The microprocessor will select the operating mode from the following:
• High Speed Cool
• Low Speed Cool
• Low Speed Modulated Cool
• Null (CYCLE-SENTRY operation only)
• Low Speed Modulated Heat
• Low Speed Heat
• High Speed Heat
• Defrost
NNootteess::
1. ETV Operation and High Speed Heat is locked out if controller setpoint is below Fresh/Frozen temperature
setting
2. During Cycle Sentry Operation:
• After initial unit start-up and unit pull-down to setpoint, the controller limits Low Speed Cool operation
when the controller setpoint is below Fresh/Frozen temperature setting. On increasing compartment
temperature, the unit operates in Low Speed Cool for a maximum of 8 minutes in an attempt to reach
setpoint. If setpoint is not reached within 8 minutes, the unit will operate in High Speed Cool until
setpoint is reached
• Unit mode is Null when the engine temperature and battery are satisfied.
• Null mode if setpoint is below Fresh/Frozen temperature setting.
EElleeccttrriicc OOppeerraattiioonn
The microprocessor will select the operating mode from the following:
• Cool
• Modulated Cool (Continuous operation only)
• Null
• Modulated Heat (Continuous operation only)
• Hot Gas Heat
• Full Heat
• Defrost
UUnniitt DDeessccrriippttiioonn
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