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RSMD2R Technical Guide
TROUBLESHOOTING
LED Diagnostics
Using RSMD2R LEDs To Verify
Operation
The RSMD2R is equipped with LEDs that can be used to verify
operation and perform troubleshooting. There are LEDs for
communication, operation modes, and diagnostic codes. See
Figure 5, this page for the LED locations. The LEDs associated
with these inputs and outputs allow you to see what is active
without using a voltmeter. The LEDs and their uses are as follows:
Diagnostic LEDs
STATUS - If the software is running, this LED should blink at a
rate of 1 blink per second.
ALARM (on board) - If the module does not receive
communications for more than 1 minute, this LED will light up,
the relays will turn o, and the Analog Outputs will go to 0 VDC.
ALARM (above LCD display) - This red LED will light up and
stay lit when there is an alarm present. The type of alarm will
display on the LCD display. The ALARM LED also blinks when
the expansion valve is initializing at startup.
COMM - Every time the module receives a valid E-BUS request
from the VCCX2 Controller, this LED will blink on and then
o, signifying that it received a valid request and responded.
POWER - This LED will light up to indicate that 24 VAC power
has been applied to the controller.
Binary Input LEDs
BIN1 - This green LED will light up when Compressor Status
1 contact is closed.
BIN2 - This green LED will light up when Compressor Status
2 switch is closed.
BIN3 - This green LED will light up when the Outside Coil
Temperature switch is closed.
BIN4 - This green LED will light up when the Emergency
Shutdown switch is closed.
Relay LEDs
RLY1 - RLY5 - These green LEDs will light up when the relays
are enabled and will stay lit as long as they are active.
Digital Compressor LEDs
COMP1 - This green LED will light up when Digital Compressor
1 is unloading.
COMP2 - This green LED will light up when Digital Compressor
2 is unloading.
Figure 5: RSMD2R LED Locations
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