Carrier 69NT40-541-505, Operation And Service Manual, Page: 19 / 143

2–1 T-368
SECTION 2
INTRODUCTION
2.1 INTRODUCTION
The Carrier Transicold model 69NT40-541-505, 508,
and 509 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 include cooling and heating systems to provide
precise temperature control.
The units are suppled with a complete charge of refrig-
erant 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 autotrans-
former 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 operates 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 an
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 opera-
tion.
2.2 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.
2.3 FEATURE DESCRIPTIONS
2.3.1 Control Box
Units are equipped with an aluminum control box, and
may be fitted with a lockable door.
2.3.2 Controller
The unit is equipped with a Micro-Link 3 microproces-
sor system.
2.3.3 Temperature Readout
The unit is fitted with suction and discharge refrigerant
temperature sensors. The sensor readings may be
viewed on the controller display.
2.3.4 Pressure Readout
The is fitted with suction and discharge pressure trans-
ducers. The transducer readings may be viewed on the
controller display.
2.3.5 Compressor
The unit is fitted with a single speed reciprocating com-
pressor.
2.3.6 Condenser Coil
The unit is fitted with a two − row square formed con-
denser coil using 7mm tubing.
2.3.7 Condenser Grille
Condenser grilles are direct bolted.
2.3.8 Evaporator
The evaporator section is equipped with a hermetic
thermal expansion valve (TXV) and a heat exchanger.
The unit has six heaters.
2.3.9 Evaporator Fan Operation
Two evaporator fan motor operation systems are avail-
able. On units with Normal Evaporator Fan Operation,
opening of an evaporator fan internal protector will shut
down the unit. On units equipped with single evapora-
tor fan capability, additional relays are installed to allow
the unit to continue to operate on a single fan.
2.3.10 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.
2.4 OPTION DESCRIPTIONS
Various options may be factory or field equipped to the
base unit. These options are described in the following
sub
− paragraphs.
2.4.1 Battery
The refrigeration controller may be fitted with standard
replaceable batteries or a rechargeable battery pack.
Rechargeable battery packs may be fitted in the stan-
dard location or in a secure location.
2.4.2 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.
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