62-11637
4–8
* Refer to
for information on FreshProtect.
Figure 4.3 Continuous Default Operating Sequence
4.8
AutoFresh AIR EXCHANGE
AutoFresh Air Exchange is a factory installed option that
allows control of the atmospheric conditions within the
refrigerated compartment. When air is being exchanged,
two air ports open. The upper port allows fresh ambient
air to enter while stale air exits through the lower port.
Exchange is available with setpoints above 28°F (-
2.2°C). It is always closed when in defrost or in a Start-
Stop OFF cycle regardless of Configuration or Func-
tional Parameter settings.
Operation is dependent on two Configurations and one
or two Functional Parameters. When AutoFresh Air is
installed at the factory, the AUTO FRESH AIR Configu-
ration is set to INSTALLED. Control point at which it
becomes active is set in the control system Configura-
tions. The AUTO FRESH AIR DELAY Configuration may
be set to SETPOINT or a time value of 0 to 48 hours. If
set to SETPOINT, control will begin when the control
temperature is 1.5°F (0.8°C) away from setpoint. If a
time value is entered, it will become active after the time
has expired and the system is no longer in Pulldown or
Pull-up even if the control temperature has not reached
1.5°F (0.8°C) away from setpoint.
Table 4–2 Continuous Operation Modes
SETPOINT
ALLOWED OPERATION
32°F (0.0°C) and above
UltraFresh with FreshProtect (if Configured*)
Below 32°F (0.0°C) & Above 10.4°F (-12°C)
UltraFresh (FreshProtect Not Applicable)
Less than 10.4°F (-12°C)
Cooling (only) with UltraFreeze
Low Speed
6 Cylinder Heat*
-1.5 F (-0.8 C)
UltraFresh
+2.7 F (+1.5 C )
-2.3 F (-1.3 C )
+3.6 F ( +2.0 C )
-3.2 F (-1.8 C )
CSMV
CONTROL
CSMV -
100%
+1.5 F (+0.8 C )
Setpoint
-1.8 F (-1.0 C)
+2.3 F (+1.3 C )
-2.7 F (-1.5 C )
+3.2 F (+1.8 C )
-3.6 F (-2.0 C )
Pull Down
Low Speed
6 Cylinder Cool
Setpoint
Pull-Up*
Low Speed
2 Cylinder Heat*
FALLING
REFRIGERATED
COMPARTMENT
TEMPERATURE
SWITCH POINT
RISING
REFRIGERATED
COMPARTMENT
TEMPERATURE
SWITCH POINT
Switch Point = Controlling Temperature - Setpoint
+ results are above setpoint, - results are below setpoint
*Switch points are the same for Perishable Range and Frozen Range
except in Frozen Range heating is not allowed.
Low Speed
2 Cylinder Cool
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