Carrier 69NT40-489-100 Series Operation And Service Manual page 26

1.3.10 Compressor, Refrigeration
The unit is fitted with a single speed reciprocating
compressor.
1.3.11 Condenser Coil
The unit may be fitted with a 2 row or 4 row coil
using nominal 3/8 inch tubing, or the unit may be
fitted with a 3 row coil using 7mm tubing. The
required refrigerant charge is different for each
coil.
1.3.12 Autotransformer
An autotransformer may be provided to allow operation
on 190/230, 3phase, 50/60 hertz power. The
autotransformer raises the supply voltage to the
nominal 380/460 volt power required by the base unit.
The autotransformer may also be fitted with an
individual circuit breaker for the 230 volt power.
If the unit is fitted with an autotransformer and
communications module, the autotransformer will be
fitted with a transformer bridge unit (TBU) to assist in
communications.
1.3.13 Gutters
Rain gutters may be fitted over the control box and
EverFresh control box to divert rain away from the
controls.
1.3.14 Handles
The unit may be fitted with handles to facilitate access to
stacked containers. These handles may include fixed
handles (located at the sides of the unit) and/or a hinged
handle at the center (attached to the condenser coil
cover).
1.3.15 Water Cooling
The refrigeration system may be fitted with a water
cooled condenser. The condenser is constructed using
copper--nickel tube for sea water applications. The
water cooled condenser is in series with the air cooled
condenser and replaces the standard unit receiver.
When operating on the water cooled condenser, the
condenser fan is deactivated by either a water pressure
switch or condenser fan switch.
1.3.16 Back Panels
Back panel designs that may be fitted include panels of
aluminum and stainless steel. Panels may be fitted with
access doors and/or hinge mounting.
1.3.17 460 Volt Cable
Various power cable and plug designs are available for
the main 460 volt supply. The plug options tailor the
cables to each customers requirements.
1.3.18 230 Volt Cable
Units equipped with an autotransformer require an
additional power cable for connection to the 230 volt
source. Various power cable and plug designs are
available. The plug options tailor the cables to each
customers requirements.
T-305
1.3.19 Cable Restraint
Various designs are available for storage of the power
cables. These options are variations of the compressor
section front cover.
1.3.20 Upper Air (Fresh Air Make Up)
The unit is fitted with an upper fresh air makeup
assembly. The openings may also be fitted with
screens.
1.3.21 Controlled Atmosphere
All units covered in this manual are fitted with the Carrier
Transicold EverFresh controlled atmosphere system.
This system includes an air compressor, membrane
separator, valves, sensors and a dedicated controller to
generate nitrogen and control the level of oxygen and
carbon dioxide in the container. Details of this system
are found in Part Two of this manual, beginning on page
87.
1.3.22 Arctic Mode
To improve operation in cold ambients, the unit may be
fitted with a crankcase heater and/or a condensate drain
line heater. The crankcase heater is operated, before
start--up, to warm the compressor oil and boil off any
liquid refrigerant that may be present in the crankcase.
The drain line heater is operated to prevent freezing of
the evaporator condensate drain system.
1.3.23 Humidification
The unit may be equipped with the Carrier Transicold
NatureFresh humidity management system. The
system includes a water tank, water pump, water heater
and atomizer along with various control and monitoring
devices. It is designed to add additional moisture into
the supply air for control of cargo moisture level. A
separately bound manual covering operation and parts
for the CTD NatureFresh System is available, see the
following chart.
Manual Equipment
Number
Covered
Humidity Management
T-297
System Option
1.3.24 Power Correction
The unit may be fitted with a set of power factor
correction capacitors to assist in correction of
imbalance in current draw by the compressor.
1.3.25 Evaporator
Evaporator section options include a semi--hermetic
thermal expansion valve, a hermetic thermal expansion
valve and two sizes of heat exchangers.
1.3.26 Evaporator Fan Operation
The units are fitted with Normal Evaporator Fan
Operation, opening of an evaporator fan internal
protector will shut down the unit.
2
Type of
Manual
Technical
Supplement