29
Unit 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.
Cool:
When the temperature in the load compartment is
higher than the setpoint, the unit runs in cool mode to reduce
the evaporator return temperature.
Heat:
When the temperature in the load compartment is lower
than the setpoint, the unit changes to heat mode to raise the
evaporator return temperature.
Null:
Once the Setpoint Temperature has been reached, and
while the temperature remains between X F/C above or below
the setpoint, there is no demand for transfer of heat or cold, and
the unit runs in null mode.
Defrost:
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 coil. Defrost can be initiated automatically or
manually.
Decrease in
Temperature
Temperature Setpoint
Increase in
temperature
X C/F above the setpoint
X C/F below the setpoint
COOL
HEAT
NULL
MODE
29
Unit 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.
Cool:
When the temperature in the load compartment is
higher than the setpoint, the unit runs in cool mode to reduce
the evaporator return temperature.
Heat:
When the temperature in the load compartment is lower
than the setpoint, the unit changes to heat mode to raise the
evaporator return temperature.
Null:
Once the Setpoint Temperature has been reached, and
while the temperature remains between X F/C above or below
the setpoint, there is no demand for transfer of heat or cold, and
the unit runs in null mode.
Defrost:
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 coil. Defrost can be initiated automatically or
manually.
Decrease in
Temperature
Temperature Setpoint
Increase in
temperature
X C/F above the setpoint
X C/F below the setpoint
COOL
HEAT
NULL
MODE
Содержание Thermo King V-520 10
Страница 2: ......
Страница 4: ...2 2...
Страница 6: ...Introduction 4 Introduction 4...
Страница 14: ...Safety Precautions 14 Safety Precautions 14...
Страница 40: ...Unit Operation 40 Unit Operation 40...
Страница 48: ...Specifications 48 Specifications 48...
Страница 52: ...Maintenance Inspection Schedule 52 Maintenance Inspection Schedule 52...
Страница 58: ...Loading and Enroute Inspections 58 Loading and Enroute Inspections 58...
Страница 60: ...Serial Number Locations 60 Serial Number Locations 60...
Страница 62: ...Warranty 62 Warranty 62...
Страница 72: ...72 72...
Страница 73: ......
