Frozen Mode; Defrost Cycle; Minimum Off Time; Figure 4.2 Operating Sequence - Frozen Mode - Carrier Neos 100S Operation & Service Manual

4.1.2

Frozen Mode

The unit operates in frozen mode if the set point is below 10°F (-12°C). In this case, the unit switches to two modes
of operation, as shown in
Differential between setpoint
and box T° decreases
4.2

DEFROST CYCLE

Defrost is an independent cycle overriding cooling and heating functions in order to melt frost and ice from the
evaporator when necessary.
Defrost may be initiated automatically by the microprocessor or manually by the operator.
In defrost mode, the microprocessor displays "dF" on the cab command and setpoint is no longer displayed.
During defrost, the evaporator fans shut down and operation of the condenser fan is controlled by the microproces-
sor. For a description of the refrigeration circuit during heat and defrost, see
4.3

MINIMUM OFF TIME

Once the unit has cycled off, it will remain off for the minimum off-time of five minutes. This prevents rapid cycling
due to changes in air temperature. Air temperature in the box changes rapidly but it takes time for the product tem-
perature to change.
62-11848
Figure 4.2.

Figure 4.2 Operating Sequence - Frozen Mode

COOL
Differential between setpoint
and box T° increases
+
ºC
SETPOINT
DEAD BAND
Section
4-2
COOL
2.8.2.