Re-Start Parameters - Carrier X4 7300 Operation & Service Manual

2. The engine coolant temperature has warmed
Each time the unit is started it must continue to run until
the coolant temperature rises to 95°F (35°C) to ensure
it has fully warmed up before shutdown is allowed.
3. The battery is fully charged - Voltage
A good battery is defined as having 13.4 VDC at 77°F
(25°C). The control system will calculate the equivalent
voltage based on the ambient temperature and shut-
down will be allowed when battery voltage is at or
above the calculated value.
4. The battery is fully charged - Amperage
The control system will calculate the average current
draw over a 20 second period. Once this average
drops below the selected value, shutdown will be
allowed. The CURRENT FOR START-STOP SHUT-
OFF is selected in the control system Configurations.
The value may be set from 1 to 10 amps in 0.5 amp
intervals. The factory default setting is 7 amps.
5. The compartment temperature requirement is
satisfied
In Start-Stop Operation the refrigeration system will
operate in Pulldown or Pull-Up Mode in order to reach
the shutdown condition as quickly as possible.
Shutdown will be allowed when the compartment tem-
perature is within 0.5°F (0.3°C) of setpoint, for opera-
tion in the Perishable Range. In the Frozen Range,
shutdown will be allowed when the compartment tem-
perature is calculated to be within 0.5°F minus the
FROZEN SHUTDOWN OFFSET (0.3°C minus the
FROZEN SHUTDOWN OFFSET) of setpoint.
The FROZEN SHUTDOWN OFFSET Functional
Parameter may be set from 0 to 3.6°F (0 to 2°C) in
0.5(C or F) increments. The factory default setting is
0°F (0°C).
4.6.3

Re-Start Parameters

While the unit is in a Start-Stop OFF Cycle, restart will
be initiated when one of the following conditions
occurs:
NOTE
In Start−Stop Operation when the setpoint is in
the frozen range (below +10.4°F = -12°C), the unit
will not restart when the temperature is below set-
point except as indicated in the following.
1. Engine coolant temperature drops below
selected Configuration value
The control system will monitor coolant temperature. If
coolant temperature drops below the ENGINE TEM-
PERATURE FOR RESTART Configuration value the
engine will be started. The Configuration value may be
set from 10 to 32°F (-12.2 to 0°C) in 0.5(C or F) incre-
ments. The factory default setting is 32°F (0°C).
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.
2. Battery voltage falls below selected Configura-
tion value
The control system will monitor battery voltage.
62-11637
If battery voltage is at or below the VOLTAGE FOR
START-STOP RESTART Configuration value the
engine will be started. The value may be set from 12.0
to 12.8 volts. The factory default setting is 12.2 volts.
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.
3. The Maximum Off Time has expired
In some ambient conditions there are times when the
unit may remain in a Start-Stop Off cycle for extended
periods of time. To ensure that the entire load stays
within the normal restart temperature range, the MAXI-
MUM OFF TIME Functional Parameter may be used to
force the unit to restart to circulate air in the compart-
ment. This will ensure there are no hot spots and the
temperature sensor reading accurately reflects product
temperature. The parameter value may be set to 0 min-
utes or from 10 to 225 minutes in 1 minute intervals.
If the MAXIMUM OFF TIME is 0 minutes, there is no
maximum off time for Start-Stop and the unit will
remain off. The factory default setting is 0 minutes.
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.
4. The Minimum Off Time has expired
The MINIMUM OFF TIME Functional Parameter set-
ting allows the unit to remain off for extended periods of
time, maximizing fuel/power economy. The unit may
not be restarted until the MINIMUM OFF TIME has
expired and the compartment temperature is greater
than the PERISHABLE RESTART TEMPERATURE
value selected in the Functional Parameters away from
setpoint. In the Frozen Range, restart is allowed when
the compartment temperature is calculated to be
greater than 0.5°F above setpoint. The MINIUMUM
OFF TIME parameter value may be set from 10 to 90
minutes in 1 minute intervals. The factory default set-
ting is 20 minutes. The RESTART TEMPERATURE
value may be set from 0.5 to 18°F (0.28 to 10°C) in 0.5
(F or C) increments. The factory default is 3.6°F (2°C).
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 continu-
ally monitors the refrigerated compartment temperature
and the override functional parameter value. During the
Minimum Off Time, should the refrigerated compartment
temperature drift this far above or below setpoint 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 0.5 to 18°F (0.28 to
10°C) in 0.5° increments. The factory default setting is
5.5°F (3°C).
Whenever the unit restarts, temperature control will be in
the Pulldown or Pull-Up Mode (refer to
4–6
Section 4.4.1).