62-11389
4
−
3
NOTES
1. The compressor is always started with both
unloaders energized (unloaded). After 10
seconds of operation (for UL1) or 1 minute
of operation (for UL2) they are allowed to
transition to the unloader state required for
the present mode of operation.
2. The condenser fan will operate any time the
engine or compressor is operating.
3. If suction pressure is below 100 psig (6.8
bar) the evaporator fan will start 10
seconds after compressor start. If suction
pressure is above 100 psig (6.8 bar) the fan
start will be delayed until suction pressure
is below 100 psig (6.8 bar) or until 20
seconds has elapsed.
4.3.2 Perishable And Frozen Set Point Ranges.
There are two ranges defined for set point.
a. Perishable Range = set points above +10.4
°
F
(-12
°
C).
b. Frozen Range = set points of or below +10.4
°
F
(-12
°
C).
4.3.3 Pull Down/Pull-Up
When in Pulldown, the refrigeration system will operate
with the compressor loaded (six cylinders), the EVXV
controlling superheat to allow maximum flow, and (in
Engine Operation) in high speed.
When in Pull-Up, and Engine Operation, the engine will
operate in high speed.
Pulldown/Pull-Up will be entered:
•
following a Start-Up.
•
following a set point change.
•
following an operational change (Start-Stop Opera-
tion vs Continuous Operation or Engine Operation vs
Standby Operation).
•
following a defrost termination.
•
when in a Start-Stop ON Cycle and all other Stop
Parameters have been met except the compartment
temperature Stop Parameter.
Pulldown/Pull-Up will end when one of the following
occurs:
•
when in Engine Operation and the microprocessor is
calling for low speed due to an override or Configura-
tion Setting.
•
when in Start-Stop Operation and the compartment
temperature Stop Parameter has been satisfied while
one or more of the other Stop Parameters has not.
•
If in Continuous Operation - perishable and the High
Speed Pulldown Configuration is OFF and the tem-
perature is in the required range Pulldown Mode
ends.
•
If in Continuous Operation - perishable and the High
Speed Pulldown Configuration is ON: when the tem-
perature is equal to or less than 0.36
F (0.2
C) above
set point.
4.3.4. Defrost
Refer to Section 4.6 for a description of defrost.
4.3.5. Overrides
With the complex control systems in use with the
Advance microprocessor there are many user selected
and preprogrammed software overrides and
Configuration settings which may change the operation
of the unit. Refer to Sections 4.7 & 4.8 for complete
descriptions of these features.
4.4 START-STOP OPERATION
Start-Stop is provided to reduce fuel or power
consumption. This feature allows full automatic control
of the unit by monitoring compartment temperature,
battery condition and (when in Engine Operation)
engine coolant temperature.
The main function of Start-Stop Operation is to
shutdown the engine or compressor after certain
conditions are met (to provide an efficient temperature
control system) and to initiate a restart sequence after
certain conditions are met. The Start-Stop/Continuous
key is pressed to select between Continuous and
Start-Stop Operation. The corresponding LED will be
illuminated.
NOTE
The microprocessor may be locked so that the
unit will always operate in Start-Stop whenever
the set point is within a specific range. Refer to
Range Lock (Section 4.7.2) for additional infor-
mation.
4.4.1 Start-Stop Configuration
Microprocessor control of Start-Stop Operation is
dependent on both Configuration and Functional
Parameter settings. The first setting to be considered is
the START-STOP PARAMETERS Configuration. This
setting determines control actions when in the Perishable
Range or Frozen Range. The available settings are
TOGETHER and SEPARATE.
•
When SEPARATE is chosen the control action will be
different, depending on whether the set point is in the
Perishable Range or in the Frozen Range (refer to
Section 4.3.2).
•
When TOGETHER is chosen, the same settings ap-
ply to any set point.
If
TOGETHER
is selected, then the following Functional
Parameter values will be available for use:
•
MINIMUM RUN TIME
•
MINIMUM OFF TIME
•
RESTART TEMPERATURE
•
OVERRIDE TEMP
•
MAXIMUM OFF TIME
•
FROZEN SHUTDOWN OFFSET
