2-- 5
© 2012 Mobile Climate Control T-299 Rev. 08/2012
2.6 GEN 4 - WITH TOTAL CONTROL, UNIT OPERATING
INSTRUCTIONS
The controller is configured to operate with the
GEN 5 unit by default. To operate as a GEN 4 unit
controller, the following changes need to be made
thru the controller. The operation of the controlleris
similar between the GEN 4 unit and the GEN 5 unit
except the GEN 4 unit has only three speeds.
a. Modification Of Parameter P01
Press and hold + or -- keys simultaneously for
5 seconds to access parameters programing
mode.
P01 shows up on the display screen for 1
second and the current value of P01 will be
shown. While viewing the current value, press
+ to change the value of the parameter P01 =1.
When in parameter, if no key is pressed for 5
seconds, the display will go back to default
mode showing temperature set point.
b. Fan Speed Selection
Press the Fan Speed button.
Press th e + or - button to toggle between HIGH,
MEDIUM, and LOW speeds.
NOTE: Other operating functions like setting the
temperature, checking inside temperature, and alarm
codes are similar between bot h Generation (GEN 4/
GEN 5) of units.
2.7 PRE-TRIP INSPECTION
After starting system operation, allow system to
stabilize for ten to fifteen minutes and check for the
following:
1 Listen for abnormal noises from the vehicle en
gine, evaporator and condenser areas.
2 Ensure evaporator and condenser fans are operat
ing.
3 Water dripping from the evaporator or air ducts.
4 Reduced airflow. This is normally caused by dirty
or clogged evaporator filters.
2.8 SEQUENCE OF OPERATION
Three types of con t ro l circuit are provided for split
system equipment. They consist of the three position
switch type, adjustable fan speed type and the Total
Control type. Typical operating sequence
descriptions for the various types are provided in the
following subparagraphs.
2.8.1 Three Position Switch Operation
With Power to the ignition circuit breaker (see
Figure 5-3) and battery circuit b reaker the fan speed
switch is placed in the LOW, MEDIUM or HIGH
position to start the system. In the LOW and
MEDIUM positions, power flows from the ignition
circuit breaker through the fan speed switch and
terminal board (TB) terminal 8 or 7 and the
evaporator fan resistor to start the evaporator fans.
In the HIGH position, power flows through TB-1 to
energize the high speed relay (HSR). HSR closes it's
normally open contacts to provide power from the
high speed fan circuit breaker through TB-2 and the
evaporator fan resistor to start the evaporator fans.
Power also flows from the fan speed switch common
terminal through the thermostat to TB-3. From
TB-3 power flows to energize the condenser relay
(CR) which closes it's normally open contacts to
provide power from the battery circuit breaker
through TB-4 to start the condenser fans (CM).
Power also flows from TB-3 through the low
pressure switch (LP), high pressure switch (HP) and
TB-5 to energize the clutch relay (CLR). Energizing
CLR closes it's normally open contacts to provide
power from the battery circuit breaker through TB-6
and energize the clutch. Energizing the clutch starts
the compressor.
The operating sequence of a Tie-In system or a
system with multiple evaporators, con densers o r
compressors is similar to t he preceding description.
Refer to Figure 5-4 for a typical Tie-In system
schematic or Figure 5-5 for a multiple component
schematic.
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