AAON ASM01891 User Manual

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Two Condenser Head Pressure II Module Technical Guide
16
TROUBLESHOOTING
Figure 6: LED Locations
LED Diagnostics
 Module LEDs
“R1” - This LED will light up whenever Condenser A Enable
Relay is enabled and will stay lit as long as the relay is active.
“R2” - This LED will light up when the Reversing Valve A Enable
Relay is enabled and will stay lit as long as the Reversing Valve
A is active.
“R3” - This LED will light up whenever Condenser B Enable
Relay is enabled and will stay lit as long as the relay is active.
“R4” - This LED will light up when the Reversing Valve B Enable
Relay is enabled and will stay lit as long as the Reversing Valve
B is active.
LED Diagnostics
“PWR” LED: When the Two Condenser Head Pressure II
Module is powered up, the PWR LED (located below the address
switches) should light up and stay on continuously. If it does not
light up, check to be sure that the power wiring is connected to
the board, the connections are tight, and the VCM-X series or SA
series controller is powered. If after making all these checks, the
PWR LED does not light up, the module is probably defective.
“COMM” LED: When the Two Condenser Head Pressure II
Module is powered up while in Stand Alone Mode, the COMM
LED does not light up. When the module is connected to a
VCM-X series or SA series controller, the COMM LED should
light up, indicating Communications. Each time Communications
are detected, this LED should continuously blink on and o,
for a half second. This LED should never stop checking for a
Communications signal. If it does not light up, check to be sure
that the power wiring is connected to the board, the connections
are tight, and the VCM-X series or SA series controller is
congured for Head Pressure Control and is powered up. If after
making all these checks, the COMM LED does not light up, the
board is probably defective.
“STAT” LED: As previously described, when the module is
rst powered up, the STAT LED will blink out the number of
installed sensors
“ALARM” LED: As previously described, this LED will blink on
and o to indicate alarms and diagnostics.
Other Checks
NOTE: The Two Condenser Head Pressure II Module
contains no user-serviceable parts. Contact
qualied technical personnel if your module is not
operating correctly.

AAON ASM01891 Specifications

General

Brand	AAON
Model	ASM01891
Category	Control Unit
Language	English