Carrier TRANSICOLD Vector 8500 Operation & Service Manual Download

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4–6

If this is the only reason operation is required, the unit
will operate as if it is in Continuous Operation until the
requirement has been met.

5. Compartment temperature has exceeded the

Override Functional Parameter value

During MINIMUM OFF TIME the control system contin-
ually monitors the refrigerated compartment tempera-
ture and the override functional parameter value.
During the Minimum Off Time, if the refrigerated com-
partment temperature drifts this far above or below set-
point in the Perishable Range, or above setpoint in the
Frozen Range, the unit will override the Minimum Off
Time, and restart. The value may be set from 3.6 to
18°F (2 to 10°C) in 0.5 increments. The factory default
setting is 12°F (6.7°C).
Whenever the unit restarts, temperature control will be
in the Pulldown or Pull-Up Mode.

4.6

CONTINUOUS OPERATION

In Continuous Operation, the unit will not shutdown
except in response to a shutdown alarm. Temperature
control in the compartment will operate under Pull-
down, Pull-Up, Cooling, Heating and Null.
Continuous Operation is normally used for fresh pro-
duce and other sensitive product loads. The Start-Stop/
Continuous key is pressed to switch between Continu-
ous Operation and Start-Stop Operation. The mode of
operation will be indicated in the status bar.

NOTE

The control system may be locked so that
the unit will always operate in Start-Stop or
in Continuous whenever the setpoint is
within a specific range. Refer to Range Lock
(

Section 4.10.2

) for additional information.

4.7

TEMPERATURE CONTROL

4.7.1

Perishable And Frozen Setpoint Ranges

There are two ranges defined for setpoint.
a. Perishable Range = setpoints above +10.4°F (-12°C).
b. Frozen Range = setpoints at or below +10.4°F (-12°C).

4.7.2

Temperature Determination

The control system monitors the temperature readings
from the supply and return temperature sensors to
determine the mode of operation required to maintain
compartment temperature in accordance with setpoint.
The sensor used for temperature control is dependent
on the selection made in the TEMP CONTROL Func-
tional Parameter.

• If the selection is RETURN AIR the return air

sensor (RAT) will be used for any setpoint.

• If the selection is SUPPLY AIR the control sys-

tem will switch to the supply air sensor (SAT)
when operating with a perishable setpoint (refer

Section 4.7.1

for more information on frozen

and perishable setpoints) and the return air sen-
sor will continue to be used for frozen setpoints.

The modes of operation include Pulldown, Pull

−

Up,

Cooling, Heating and Null.

4.7.3

Cool/Heat/Null Mode Switching Logic

When not in Pulldown and in Continuous Run Mode,
operation in cool, heat and null modes is determined in
accordance with the calculated Controlling Tempera-
ture value (CT), the difference between this value and
Setpoint (SP) and the FUEL SAVER (ECO) MODE
Functional Parameter setting in accordance with the
following:

Carrier TRANSICOLD Vector 8500, Operation & Service Manual

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