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System Operation Monitor (LSOM)
The system operation monitor (A132) detects the most
common fault conditions in the air conditioning system.
When an abnormal condition is detected, the module com-
municates the specific condition through its ALERT and
TRIP lights. The module is capable of detecting both me-
chanical and electrical system problems. See figure 9 for
the system operation monitor.
System Operation Monitor (A132)
DATA OUTPUT
CONNECTOR
.25" SPADE
CONNECTOR (5)
POWER LED
DATA OUTPUT
Y
C
R
ALERT LED
TRIP LED
Figure 9
IMPORTANT
This monitor does not provide safety protection. The
monitor is a monitoring device only and cannot con-
trol or shut down other devices
.
LSOM LED Functions
Power LED (green) −−
Voltage within the range of
19−28VAC is present at the system monitor power connec-
tion.
Alert LED (yellow) −−
Communicates an abnormal system
condition through a unique flash code. The alert LED
flashes a number of times consecutively; then pauses;
then repeats the process. This consecutive flashing corre-
sponds with a particular abnormal condition.
Trip LED (red) −− I
ndicates a demand signal from the ther-
mostat; but detects no current to the compressor.
Flash code number −− Corresponds to a number of LED
flashes, followed by a pause, and then repeated.
Trip & Alert LEDs flashing simultaneously −− Indicates that
the control circuit voltage is too low for operation.
Reset ALERT flash code by removing 24VAC power from
monitor. Last ALERT flash code will display for 1 minute af-
ter monitor is powered on.
LSOM codes are given in table 5.