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RSMVQ Technical Guide
LCD SCREENS
Alarms Screens
Alarms Screen
If an alarm is present, the ALARM LED above the LCD display
will light up red and blink. The alarms will display and scroll
automatically from the ALARMS screen when alarms are present.
NO ALARMS:
This will be shown if there are no current alarms.
DMQ NOT DETECTED:
This will be shown if no communication
exists between the RSM and DMQ.
EBUS SLAVE (SLV) TIMEOUT:
This alarm indicates that
communication has been lost between the RSMVQ and the
AAON controller. This can be the result of a bad cable, a missing
cable, or the module not being configured properly.
NO SUCTION PRESSURE TRANSDUCER (SUCT) DETECTED:
This alarm indicates the Suction Pressure Transducer is not
detected by the system. The system will shut down due to unsafe
suction safety and will retry after five minutes.
NO HEAD PRESSURE TRANSDUCER (HEAD) DETECTED:
This alarm indicates the Head Pressure Transducer is not detected
by the system. This will cause the condenser to go to 100%.
COMPRESSOR (COMP) 1 FAULT:
This alarm will occur if the
compressor fails to run 45 seconds after the relay is activated
or if the signal is lost after activation. This will cause an alarm
and will shut down the compressor (relay). The system will retry
after five minutes.
COMPRESSOR (COMP) 2 FAULT:
This alarm will occur if the
compressor fails to run 45 seconds after the relay is activated
or if the signal is lost after activation. This will cause an alarm
and will shut down the compressor (relay). The system will retry
after five minutes.
HIGH HEAD PRESSURE (HP) DETECTED:
This indicates a
High Head Pressure Alarm condition which is activated when
the Head Pressure rises above 550 psig. This will cause the
condenser to go to 100%.
LOW SUCTION PRESSURE FAILURE:
This alarm will occur if
suction pressure stays below the Low Suction Pressure Setpoint
for one minute or falls below 40 psig for five seconds. This
alarm will shut down the system. The system will retry after
five minutes.
LOW SUCTION PRESSURE (SP) DETECTED:
This alarm will
occur if suction pressure falls below the Low Suction Pressure
Setpoint for 20 seconds. The system will try to protect by
lowering compressor modulation percentage.
LOW SUPERHEAT 1 (SH1) DETECTED:
This alarm will be
activated when the Superheat is less than 4ºF for two minutes
during normal operation or four minutes during the first 10
minutes. The system will shut down and will retry after five
minutes.
LOW SUPERHEAT 2 (SH2) DETECTED:
This alarm will be
activated when the Superheat is less than 4ºF for two minutes
during normal operation or four minutes during the first 10
minutes. The system will shut down. The system will shut down
and will retry after five minutes.
COIL 1 TEMP 1 FAILURE:
This alarm will occur if the coil
temperature is not within operable range (below -32ºF or above
310ºF). This could be the result of a bad sensor or faulty wiring.
This alarm will shut down the system. The system will reset after
five minutes if the sensor is detected.
COIL 2 TEMP 2 FAILURE:
This alarm will occur if the coil
temperature is not within operable range (below -32ºF or above
310ºF). This could be the result of a bad sensor or faulty wiring.
This alarm will shut down the system. The system will reset after
five minutes if the sensor is detected.
COMP VFD FAULT:
This alarm will occur if the Copeland™
VFD compressor communicates through E-BUS that it has shut
down due to a fault condition. The compressor module will
attempt to reset the fault after five minutes if the compressor
sends the signal that it is okay to reset the fault.
LOH2OTMP
—Low Leaving H
2
O Temp
NOH2OFLO
—Proof of Water Flow
HIGH SUPERHEAT 1 (SH1) WARNING:
If Superheat 1 is above
25ºF for two minutes, this alarm will appear on the module only.
It will not be sent to the main controller to display on Prism 2.
HIGH SUPERHEAT 2 (SH2) WARNING:
If Superheat 2 is above
25ºF for two minutes, this alarm will appear on the module only.
It will not be sent to the main controller to display on Prism 2.
HIGH SUPERHEAT 1 (SH1) FAILURE:
If Superheat 1 is above
30ºF for 10 minutes, it will turn off the compressors. It will retry
after five minutes. If it fails twice in two hours, it will lock out
the compressors.
HIGH SUPERHEAT 2 (SH2) FAILURE:
If Superheat 2 is above
30ºF for 10 minutes, it will turn off the compressors. It will retry
after five minutes. If it fails twice in two hours, it will lock out
the compressors.
HIGH SUPERHEAT LOCKOUT:
If the module fails on High
Superheat twice in two hours, it will lock out the compressors.
ALARMS
Summary of Contents for ASM02293
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