1
−
1
T-318
SECTION 1
INTRODUCTION
1.1 INTRODUCTION
The Carrier Transicold model 69NT40-541-300/399
series units are of lightweight aluminum frame
construction, designed to fit in the front of a container
and serve as the container’s front wall.
They are one piece, self-contained, all-electric units,
which includes cooling and heating systems to provide
precise temperature control.
The units are suppled with a complete charge of
refrigerant R-134a and compressor lubricating oil, and
are ready for operation upon installation. Forklift
pockets are provided for unit installation and removal.
The base unit operates on nominal 380/460 volt,
3
−
phase, 50/60 hertz power. An optional
autotransformer may be fitted to allow operation on
nominal 190/230 , 3 phase, 50/60 hertz power. Power
for the control system is provided by a transformer,
which steps the supply power down to 18 and 24 volts,
single phase.
The controller is a Carrier Transicold Micro-Link 3
microprocessor. The controller will operate
automatically to select cooling, holding or heating as
required to maintain the desired set point temperature
within very close limits. The unit may also be equipped
with a mechanical or electronic temperature recorder.
The controller has a keypad and display for viewing or
changing operating parameters. The display is also
equipped with lights to indicate various modes of
operation.
1.2 CONFIGURATION IDENTIFICATION
Unit identification information is provided on a plate
located near the compressor. The plate provides the
unit model number, the unit serial number and the unit
parts identification number (PID). The model number
identifies the overall unit configuration while the PID
provides information on specific optional equipment,
factory provisions to allow for field installation of optional
equipment and differences in detailed parts.
1.3 FEATURE DESCRIPTIONS
1.3.1 Control Box
Units are equipped with either an aluminum or
composite material box, and may be fitted with a
lockable door.
1.3.2 Temperature Readout
The unit may be fitted with suction and discharge
temperature sensors. The sensor readings may be
viewed on the controller display.
1.3.3 Pressure Readout
The unit may be fitted with suction and discharge
pressure gauges, suction and discharge transducers, or
no pressure readout. The transducer readings may be
viewed on the controller display.
1.3.4 Compressor
The unit is fitted with a single speed reciprocating
compressor.
1.3.5 Condenser Coil
The unit is fitted with a 3
−
row coil using 7mm tubing.
1.3.6 Evaporator
The evaporator section is equipped with a hermetic
thermal expansion valve and a heat exchanger. The unit
may have six heaters.
1.3.7 Evaporator Fan Operation
Units are equipped with single
−
phase or three
−
phase
evaporator fan motors. Opening of an evaporator fan
internal protector will shut down the unit. Refer to
Section 7 for schematic diagrams.
Two evaporator fan motor operation systems are
available. On units with Normal Evaporator Fan
Operation, opening of an evaporator fan internal
protector will shut down the unit. On units equipped with
Single Evaporator Fan Capability, additional relays are
installed to allow the unit to continue to operate on a
single fan.
1.3.8 Plate Set
Each unit is equipped with a tethered set of wiring
schematic and wiring diagram plates. The plate sets are
ordered using a seven-digit base part number and a
two-digit dash number.
1.4 OPTION DESCRIPTIONS
Various options may be factory or field equipped to the
base unit. These options are described in the following
sub
−
paragraphs.
1.4.1 Battery
The refrigeration controller may be fitted with standard
replaceable batteries or a rechargeable battery pack.
Rechargeable battery packs may be fitted in the
standard location or in a secure location.
1.4.2 Dehumidification
The unit may be fitted with a humidity sensor. This
sensor allows setting of a humidity set point in the
controller. In the dehumidification mode the controller
will operate to reduce internal container moisture level.
1.4.3 USDA
The unit may be supplied with fittings for additional
temperature probes, which allow recording of USDA
Cold Treatment data by the integral DataCORDER
function of the Micro-Link refrigeration controller.
1.4.4 Interrogator
Units that use the DataCORDER function are fitted with
interrogator receptacles for connection of equipment to
download the recorded data. Two receptacles may be
fitted; one is accessible from the front of the container
and the other mounted inside the container (with the
USDA receptacles).