62-11389
4
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1
SECTION 4
ENGINE/STANDBY/TEMPERATURE CONTROL
NOTES
1. If the unit is in an alarm condition, the microprocessor alarm response may override the operation
described herein. If an alarm is displayed in the MessageCenter, refer to the specific alarm description in
Section 7 for “Unit Control” descriptions.
2. With the complex control systems in use with the Advance microprocessor there are many user selected
and preprogrammed software overrides which may change the operation of the unit. Refer to Sections 4.7
& 4.8 for complete descriptions of these features.
4.1 INTRODUCTION
This section describes operation of the unit when power
is supplied from an external source - Standby Operation
and when power is supplied by the internal generator -
Engine Operation. The section also describes two
additional sub-categories of operation; Start-Stop
Operation (with standby or engine power) and
Continuous Operation (with standby or engine power).
For descriptions of refrigerant system component
interaction when cooling, with flow diagram, refer to
section 2.14.
4.2 ENGINE/STANDBY OPERATION
Engine or Standby Operation is chosen by positioning of
the switch labeled ENGINE/OFF/STANDBY (DOES)
OR positioning of the switch labeled
STANDBY/ENGINE (DES).
With the switch in the STANDBY position the power
supply contactor relay (PSCONR - see wiring
schematic, Section 10) is energized. Energizing
PSCONR reverses its contacts to allow power from the
power plug while the engine is shutdown and power
from the generator is locked out.
With the switch in the ENGINE position the generator
contactor relay (GENCONR) is energized. Energizing
GENCONR reverses its contacts to allow the engine
and generator to operate while power from the power
plug is locked out.
Once the Main Power switch is toggled from the OFF
position, the compressor suction modulating valve
(CSMV) and evaporator expansion valve (EVXV) will
both open to a predetermined position, to equalize
system pressure, and then close (0% open) before the
unit starts.
NOTE
The unit will not restart for at least 30 seconds
following a shutdown.
4.2.1 Standby Start-Up
On command to perform a Start-Up in Standby
Operation the microprocessor will energize the buzzer
for five seconds. The refrigeration system or heaters will
then operate in the mode(s) required for temperature
control.
4.2.2 Engine Start-Up
On command to perform a Start-up in Engine Operation
the microprocessor will enter the engine start sequence
to start the engine and direct connected generator.
Following start, the refrigeration system or heaters will
then operate in the mode(s) required for temperature
control.
At the beginning of the start sequence the
microprocessor will close the run relay (RR) contacts to
signal the engine speed control unit (ENSCU) that
engine operation is required and to provide power to the
optional electric fuel pump (FP - if supplied). During the
start sequence the engine speed control unit (ENSCU)
will hold the engine in low speed.
PRE
CRANK
HEAT
FIRST
ATTEMPT
SECOND
AND
THIRD
ATTEMPTS
15 Seconds
STOP
ENGINE
RUNNING
HEAT
3 to 10
Seconds
0 to 30
Seconds
PRE
CRANK
HEAT
ENGINE
RUNNING
HEAT
ÉÉÉÉÉÉ
ÉÉÉÉÉÉ
ÉÉÉÉÉÉ
HEAT & CRANK
5 SEC. BUZZER
HEAT & CRANK
5 SEC. BUZZER
0 - 180
Seconds
following start
0 to 30
Seconds
0 - 180
Seconds
following start
3 to 10
Seconds
Figure 4
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1 Auto Start Sequence
