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© 2012 Mobile Climate Control T-299 Rev. 08/2012
1.4 SYSTEM REQUIREMENTS LABEL
The system requirements label is conveniently
located within the vehicle's engine compartment.
This label, when properly completed by the installer,
will give the servicing technician the refrigerant and
oil charge(s), evaporator(s), condenser(s), and
compressor(s) serial numbers, the drive belt(s)
number, mount kit number, the date of installation
and the installer (See Figure 1-8).
1.5 SYSTEM DESIGNATIONS
Tie-In System - Is an MCC evaporator and
condenser connected to an existing OEM
compressor and dash evaporator. The OEM radiator
condenser is normally removed.
NOTE
You may encounter installations where the
OEM radiator style condenser is used as the
Tie-In condenser. Call Mobile Climate
Control Tech n ical Service Ho t-Line
(800-450-2211) for assistance, as this is not a
recommended Mobile Climate Control Air
Conditioning application.
Max System - An MCC system installed along with
an existing OEM system. The systems operate
independent of each other.
Stand-Alone (Standard) System - All MCC
components installed on a vehicle. These can be
either single or dual compressor systems.
IW (In-Wall) System - An MCC evaporator
installed in the front and/or rear of the vehicle. This
type evaporator is installed between the inside &
outside walls of the vehicle.
1.6 SYST EM COMPONENTS
Return Air Thermostat/Sensor - The system may
be supplied with a thermostat or thermistor Both of
these devices are temperature sensitive components
which when activated, signals the Electro-Magnetic
Clutch to engage/disengage. The return air
thermostat is normally located in the drivers control
panel while the return air thermister is normally
located in the evaporator assembly.
Electro-Magnetic clutch - The Electro-Magnetic
clutch controls the operation of the compressor.
When engaged, the compressor circulates refrigerant
and provides cooling (See Figure 1-9).
Expansion/Block Valve - Meters the refrigerant
flow into the evaporator coil. The majority of the
Gen 4 (Excel) and all Gen 5 systems use a
nonadjustable block valve with an 8° Fsuperheat
setting, which is preset at the factory. If you feelthere
is a problem with the block valve, do not attempt to
adjust the valve, replace it.
NOTE
In the event you encounter a Gen 1, Gen 2,
or Gen 3 system with an extern ally equalized
expansion valve and/or a system with
refrigerant R12, co n t act MCC's Technical
Service Hot Line (800-450-2211) for
assistance.
Evaporator - The evaporator is located in the
interior of the vehicle. Its primary function is to
transfer heat contained in the passenger
compartment air, into the refrigerant, which is
circulated by the compressor, through the
evaporator coil. During this process the air is also
filtered and dehumidified.
Resistor - Resistors are used to control the speeds of
the permanent magnet evaporator blower motors.
Compressor - The compressor is a belt driven,
high-pressure pump, which circulates the refrigerant
through the evaporator and condenser . The
operation of the compressor is controlled by the
Electro-Magnetic clutch.
Condenser - The condenser is normally located in
the skirt or on the roof of the vehicle. Its primary
function is to reject heat, which was transferred to
the refrigerant by the evaporator from the passenger
compartment of th e vehicle.
Filter-Dryer - The filter-dryer removes moisture
and particulate matter from the refrigerant.
Receiver-Dryer - The receiver-dryer removes
moisture and particulate matter from the refrigerant.
The receiver-drier also stores a small amoun t o f
liquid refrigerant.
Pressure Switches - Thesystemsusehighandlow
pressure switches wired in series to cont ro l t he
power circuit of t h e com p ressor clutch relay. If
either pressure switch opens, interrupting the circuit
to the clutch relay, the operation of the compressor
will stop. When conditions return to normal the
switch will automatically reset and the compressor
will resume operating. The switches are
non-adjustable.
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