2--2
©
2012 Mobile Climate Control
T-348 Rev. 07/2012
2.2 PRE-TRIP INSPECTION
After starting system, allow system to stabilize for ten
to fifteen minutes and check for the following:
a. Listen for abnormal noises in compressor or fan
motors.
b. Check compressor oil level. (Refer to section
4.15.4)
c. Check refrigerant charge. (Refer to section 4.8.1)
d. Ensure that self-test has been successfully per
formed and that there are no errors or alarms indi
cated. (Refer to section 2.1.3.)
2.3 MODES OF OPERATION
The system is operated by a Mobile Climate Control
Micromax microprocessor controller which consists
of a logic board (Figure 1-10), relay board (Figure
1.15 or Figure 1.16), and manual operator switches.
The logic board regulates operational cycles of the
system by energizing or de-energizing Relay Board
relays in response to deviations in interior
temperature. Modes of operation include Cooling,
Heat and Vent. Refer to Figure 2-1 and the following
paragraphs for a description of each mode.
Figure 2-1 shows the Logic Board actions at various
temperature deviations from setpoint. On rising
temperature, changes occur when the temperature
rises above Logic Board setpoints, On falling
temperature, changes occur when temperatures falls
below Logic Board set point. The system will operate
in these modes unless pressures override the Logic
Board settings.
COOL
HIGH SPEED
LOADED
COOL
HIGH SPEED
4 CYLINDERS
COOL
LOW SPEED
2 CYLINDERS
REHEAT DUTY CYCLE
LOW SPEED
4 CYLINDERS
HEAT
SETPOINT
2
°
F
3
°
F
1
°
F
--2
°
F
--4
°
F
--3
°
F
--1
°
F
--5
°
F
HEAT
LOW SPEED
HIGH SPEED
0--100%
VENT
HEAT
SETPOINT
2
°
F
3
°
F
1
°
F
--2
°
F
--4
°
F
--3
°
F
--1
°
F
--5
°
F
HEAT
HIGH SPEED
Cool
Heat
Figure 2-1 Capacity Control Diagram
