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TK 61651-18-OP-EN
Operating Instructions
General Operation
In truck-driven units, temperature control is based on two values: The setting
(Setpoint) of the electronic thermostat and the evaporator return
temperature. The difference between these two temperatures will determine
the mode of operation: cool, heat, or null.
• CCooooll:: When the temperature in the load compartment is higher than the
setpoint, the unit runs in cool mode to reduce the evaporator return
temperature.
• HHeeaatt:: When the temperature in the load compartment is lower than the
setpoint, the unit changes to heat mode to raise the evaporator return
temperature.
• NNuullll:: Once the Setpoint Temperature has been reached, and while the
temperature remains between XºC/F above or below the setpoint, there is
no demand for transfer of heat or cold, and the unit runs in null mode.
• DDeeffrroosstt:: After a scheduled period of time in cool mode, between 1 and 8
hours, the unit runs in this fourth mode of operation to eliminate ice that
has accumulated in the evaporator or condenser coil. Defrost can be
initiated automatically or manually.
Factory setting for X is 3ºC (5ºF). During unit installation, this value can be
adjusted by between 1 and 5ºC (2 and 9ºF) in increments of 1ºC/F.
UUnniittss wwiitthh RR--113344aa rreeffrriiggeerraanntt:: Temperatures can be controlled from -20ºC
to +22ºC (-4ºF to +71ºF).
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