2–1 62-11640
SECTION 2
UNIT DESCRIPTION
2.1 INTRODUCTION
WARNING
!
APX control system equipped units may
start automatically at any time the
START/ RUN-OFF switch (SROS) is in the
START/ RUN position. Also, the unit may
be fitted with two way communication
equipment that will allow starting of the
unit from a remote location even though
the switch is in the OFF position.
WARNING
!
Be aware of HIGH VOLTAGE supplied at
the power plug or from the generator.
When performing service or maintenance
procedures: ensure any two way commu-
nication is disabled in accordance with
the manufacturer’s instruction, ensure
the START/ RUN-OFF switch is in OFF
position and, whenever practical, discon-
nect the high voltage source, lockout/
tagout the receptacle and disconnect the
negative battery connection.
This manual contains operating data, electrical data
and service instructions for the refrigeration unit listed
in Table 2–1.
Additional support manuals are listed in Table 2–2.
The unit model/serial number plate is located inside the
unit on the frame as shown in Figure 2.1.
2.2 GENERAL DESCRIPTION
The units described in this manual are hybrid/electric,
fully charged, pre-wired, refrigeration/heating “nose-
mount” units. The units are used on insulated refriger-
ated compartments to maintain cargo temperatures
within very close limits.
Electrical power is supplied to the unit from an external
source, at the power supply receptacle (PSR), or by
the AC generator which is driven by the engine. The
generator provides nominal 480V/3ph/60Hz power
when the engine is in high speed and nominal 350V/
3ph/45Hz power in low speed.
The control system includes a manual switch, control
modules, fuses, and associated wiring. High voltage
contactors, fuses and the contactor control boards are
located in the control box while contactors for the
optional standby electric power are located in the
standby box (see Figure 2.4). The unit may be
equipped with an optional remote light bar which
mounts separately on the front outside corner of the
refrigerated compartment.
Temperature control is provided by the Carrier Transi-
cold APX control system (Refer to Section 2.5). Once
the system is set at the desired temperature, the unit
will operate automatically to maintain the desired tem-
perature within very close limits. When in Engine Oper-
ation, the control system automatically selects high and
low speed cooling or high and low speed heating as
necessary to maintain the desired temperature within
the refrigerated compartment.
Standard equipment includes an auto start-stop fea-
ture. This feature provides automatic cycling of the die-
sel engine, which in turn offers an energy efficient
alternative to continuous operation of the engine with
control of temperature by alternate cooling and heating
of the supply air (evaporator outlet air).
The unit may be equipped with the AutoFresh Air
Exchange which controls air quality and humidity for
fresh produce.
The unit is described as having three major sections:
• the condensing section (Figure 2.1 & Figure
2.2), which includes the engine generator drive
package (Figure 2.2)
• the evaporator section (Figure 2.3)
• the control system (Figure 2.2)
Table 2–1 Model Chart
Model R-404A Compressor Engine Engine Speed
Vector 8500 NDK LB 14
KG 6.35
Scroll V2203L-DI-EF01e High 1800
Low 1350
Table 2–2 Additional Support Manuals
Manual Number Type of Manual Manual Number Type of Manual
62-11369 P Parts Look Up System (PLUS) 62-11645 Easy To Run
62-11646 Operator’s Manual 62-11362 Engine Workshop Manual
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