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©
2012 Mobile Climate Control
T-348 Rev. 07/2012
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
This manual contains Operating Instructions,
Service Instructions and Electrical Data for the
Model 68AC353 Air Conditioning and Heating
equipment furnished by Mobile Climate Control as
shown in Table 1-1 and Table 1-2. Additional
support manuals are referenced in Table 1-3.
The Mobile Climate Control model 68AC series
units are of lightweight frame construction, designed
to be installed on the vehicle roof.
Model 68AC353 systems consists of a condensing
section, evaporator section and an engine
compartment mounted compressor. To complete
the system, the air conditioning and heating
equipment interfaces with electrical cabling,
refrigerant piping, engine coolant piping (for
heating), duct work and other components
furnished by the bus manufacturer. See Figure 1-1.
Operation of the units is controlled automatically by
a microprocessor based Micromax Controller which
maintains the vehicle's interior temperature at the
desired set point.
1.2 CONFIGURATION IDENTIFICATION
Unit identification information is provided on a plate
located inside the condenser and evaporator
sections. 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 and differences in detailed parts.
The following paragraphs provide descriptions of
the options provided. A tabular listing of unit model
numbers and PID numbers, used to assist the reader
in identifying the equipment supplied is provided in
Table 1-1 and Table 1-2.
1.3 OPTION DESCRIPTION
Various options may be factory or field equipped to
the base unit. These options are listed in the tables
and described in the following subparagraphs.
1.3.1 Condenser Cover (Skins)
The condenser section may be fitted with one of two
different cover assemblies dependent upon the
curvature of the bus roof. The assemblies available
are identified as the 10 M radius cover and the 6.5 M
radius cover.
1.3.2 Condenser Electrical Kit
The 68AC353 condenser kits are wired for either 24
Volt permanent magnet motors or 24 Volt brushless
motors.
1.3.3 Condenser Fan Kit
The 68AC353 condenser kits are available with either
4 or 6 fans, with either permanent magnet or
brushless motors.
1.3.4 Condenser Refrigeration Kit
The 68AC353 condensers are all fitted with a
condenser coil, a receiver with sight glasses and
fusible plug, a charge isolation valve and
interconnecting tubing.
1.3.5 Evaporator Skins Kit
The evaporator section may be fitted with one of two
different cover assemblies dependent upon the
curvature of the bus roof. The assemblies available
are identified as the 10 M radius cover and the 6.5 M
radius cover.
1.3.6 Evaporator Blower Kit
The 68AC353 evaporator kits are available with
either 4 or 6 blowers, with either permanent magnet
or brushless motors.
1.3.7 Evaporator Connection Kit S/D
The evaporator units are assembled to allow
orientation of the connections for different
mounting arrangements and may be supplied with
various refrigerant piping layouts for specific
applications.
1.3.8 Evaporator Connection Kit - Indash
The evaporator units are assembled to allow
connections for various refrigerant piping layouts for
remote evaporators.
1.3.9 Evaporator Connection Kit (Heating)
The evaporator units are assembled to allow
orientation of the connections for different
mounting arrangements and may be supplied with
various engine coolant piping layouts for specific
heating applications.
