System Operation Monitor - Lennox 15CHAX−24 Installation Instructions Manual

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)
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
DATA OUTPUT
CONNECTOR
.25" SPADE
CONNECTOR (5)
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) −− Indicates 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.
Page 11