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General Description
Unit Description
CRR-20 & CRR-40, September 1999
LED indicator is included in each output circuit to show when
the output is energized. The
µ
P-D output module is located
inside the control box.
Indicator Lights
Indicator lights on the
µ
P-D controller signal Cool,
Modulation, Null, Heat, In-range, Defrost, Supply Air
Temperature, Return Air Temperature, Power Limit and
Alarm.
USDA Cold Treatment Temperature Recording
The
µ
P-D controller includes provisions for the use of three or
four USDA sensors. These sensors allow temperatures in vari-
ous areas of the load to be monitored and recorded for United
States Department of Agriculture use in monitoring Cold
Treatment shipments. The controller software must be config-
ured for USDA temperature recording and set to “USDA ON”
(through the Program submenu).
Auxiliary Battery and Battery Charger Option
An optional 12 Vdc, 7 or 12 amp hour battery provides power
for controller operation and datalogging when unit 460-380
Vac supply power is disconnected. A regulated battery charg-
er automatically maintains the battery charge when 460-380
Vac power is connected to the unit.
Dehumidification Control System Option
An optional dehumidification system lowers the relative
humidity in the container to the humidity setpoint. The control
range setpoint is adjustable between 50% and 100%.
Humidification Control System Option
An optional humidification system increases the relative
humidity in the container to the humidity setpoint. The control
range setpoint is adjustable between 50% and 100%.
Controlled Atmosphere System Option
An optional controlled atmosphere system includes two charg-
ing ports and a pressure relief valve to provide a modified
atmosphere within the container. By controlling the container
temperature and atmosphere, the respiration rate of fruit and
vegetables can be lowered. This allows the product quality to
be maintained for longer periods of time.
Dual Voltage Option
A dual voltage system includes a 15 KVA auto transformer
and an 18.3 m (60 ft) power cable for operation on 230-
190V/3 Ph/60-50 Hz power. The power cable is stored below
the control box in the condenser section.
The 15 KVA auto transformer steps 230/190V power up
to 460/380V. The auto transformer includes a 460-380V/3
Ph/60-50 Hz power receptacle.
For operation on 230/190V power, plug the 460-380V
unit power cable into the receptacle on the auto transformer.
Then plug the 230/190V power cable into a 230-190V power
supply.
Remote Monitoring Receptacle (4-Pin) Option
An optional 4-pin remote monitor connector provides 24 Vac
signals for bridge lights that monitor Cool (Compressor On),
Defrost and In-range conditions.
Recording Thermometer Options
Several models of temperature recorders are available for
mounting on the unit. Each temperature recorder is designed
to withstand widely varying environments including low and
high ambient temperatures, salt water, humidity, fungus,
industrial pollutants, dynamic loading, rain, sand and dust.
• The 31-day Saginomiya Recorder is electric motor driven by
a dry cell type battery with a 1 year life expectancy.
• The 31-day Partlow Recorder is mechanically driven by a
spring mechanism.
Power Line Communications Option
Several models of remote monitoring modems are available to
provide remote monitoring via the power cable. High speed
transmission reads all controller information.
• Thermo King ISO narrow band power line remote monitor-
ing modem is installed in a self-enclosed box bolted above
the compressor compartment.
• Sabroe Controls ISO wide band power line remote monitor-
ing modem is installed in the electrical control box.
• RTE ISO narrow band power line remote monitoring modem
is installed in the electrical control box.
Pressure Gauge Options
A high pressure gauge is available to indicate condenser (high
side) pressure. A low pressure gauge is available to indicate
compressor suction (low side) pressure.
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