Thermo King 914970, Manual

Page: 68 / 186

Electronic Controls
68
Screen #5
The set-up code for Screen #5 represents a
combination of the following settings:
High Speed (Cool) Pull-Down
This feature provides faster temperature
Pull-Down for critical cargos.
At start-up:
• In Continuous Run or CYCLE-SENTRY, to
reduce the time needed to bring cargo box
temperature down to setpoint (Pull-Down),
the unit will operate in High Speed Cool until
the return air temperature reaches setpoint.
• Once the return air temperature reaches
setpoint:
• Units operating in Continuous Run will
switch to low speed cool for five seconds
then to low speed heat. The unit will then
cycle between Low Speed Heat and Low
Speed Cool as necessary.
• Units operating in CYCLE-SENTRY will
switch to low speed cool for five seconds
to allow Battery Sentry to check the
charging current. If the battery is charged,
the unit is not in defrost and the engine
block is sufficiently warm, the unit will
shut-down, restarting as necessary. If not,
the unit will continue to run switching
from low speed heat to low speed cool as
necessary.
As operation continues:
• In Continuous Run or CYCLE-SENTRY, if
setpoint has not been reached in eight minutes
while running low speed cool, the unit will
switch to high speed cool, driving the return
air temperature back down to setpoint.
• If the unit has been running in low speed cool
for less than eight minutes and the return air
temperature reaches setpoint:
• Units operating in Continuous Run will
switch to low speed heat changing to low
speed cool as necessary.
• Units operating in CYCLE-SENTRY will
shut down, restarting as necessary.
• In Continuous Run or CYCLE-SENTRY, if
the return air temperature reaches 5.1 F
(2.8 C) degrees above setpoint, the unit will
immediately switch to high speed cool, unless
the Fuel Saver 8 minute Delay to High Speed
is active.
NOTE: High Speed Pull-Down will be inactive
in units with modulation that are operating in
Continuous Run above 15 F (-9C).
High Speed Pull-Down Fresh
The controller can initiate a High Speed
Pull-Down to setpoint of fresh loads above 15 F
(-9.4 C).
Settings:
YES = Enable High Speed Pull-Down to
setpoint.
NO = Normal operation. Do not enable high
speed pull-down to setpoint.