AAON RSMD User Manual

RSMD Technical Guide
RSMD LCD SCREENS
17
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.
ALARMS
The alarms are as follows:
NO ALARMS: This will be shown if there are no current alarms.
EBUS SLAVE (SLV) TIMEOUT: This alarm indicates that com-
munication has been lost between the RSMD and the Main controller
or other E-BUS modules that may be connected. This can be the result
of a bad cable, a missing cable, or the module not being confi gured
properly.
NO SUCTION PRESSURE SENSOR 1 (SUCT1) DETECTED:
This alarm indicates the Suction Pressure Sensor 1 is not detected by
the system. There is no compressor failure from this alarm. The failure
will be unsafe suction pressure.
NO SUCTION PRESSURE SENSOR 2 (SUCT2) DETECTED:
This alarm indicates the Suction Pressure Sensor 2 is not detected by
the system. There is no compressor failure from this alarm. The failure
will be unsafe suction pressure.
NO HEAD PRESSURE SENSOR 1 (HEAD1) DETECTED: This
alarm indicates the Head Pressure Sensor 1 is not detected by the
system. This will cause the condenser fan/valve to go to 100%.
NO HEAD PRESSURE SENSOR 2 (HEAD2) DETECTED: This
alarm indicates the Head Pressure Sensor 2 is not detected by the
system. This will cause the condenser fan/valve to go to 100%.
HIGH HEAD PRESSURE 1 (HP1) DETECTED: This indicates a
High Head Pressure Alarm condition which is activated when the Head
Pressure 1 rises above 550 PSIG. This will cause the condenser to go
to 100%.
HIGH HEAD PRESSURE 2 (HP2) DETECTED: This indicates a
High Head Pressure Alarm condition which is activated when the Head
Pressure 2 rises above 550 PSIG. This will cause the condenser to go
to 100%.
LOW SUCTION PRESSURE 1 (SP1) FAILURE: This alarm
will occur if suction pressure 1 stays below the low suction pressure
setpoint for 1 minute or falls below 40 psi for 5 seconds. This alarm will
shut down the system. Power must be cycled to clear the alarm.
LOW SUCTION PRESSURE 2 (SP2) FAILURE: This alarm
will occur if suction pressure 2 stays below the low suction pressure
setpoint for 1 minute or falls below 40 psi for 5 seconds. This alarm will
shut down the system. Power must be cycled to clear the alarm.
LOW SUCTION PRESSURE 1 (SP1) DETECTED: This alarm
will occur if suction pressure 1 falls below the low suction pressure
setpoint for 20 seconds. The system will try to protect by lowering com-
pressor modulation percentage.
Alarms Screen & Alarm History
LOW SUCTION PRESSURE 2 (SP2) DETECTED: This alarm
will occur if suction pressure 2 falls below the low suction pressure
setpoint for 20 seconds. The system will try to protect by lowering com-
pressor modulation percentage.
COMPRESSOR (COMP1) 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 5 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 5 minutes.
COMPRESSOR (COMP1) 1 BAD TEMPERATURE: This alarm
will occur if the discharge temp sensor 1 measures less than -40
degrees F or more than 356 degrees F. This will cause an alarm and
will shut down the compressor (relay). The system will retry after 5
minutes.
COMPRESSOR (COMP2) 2 BAD TEMPERATURE: This alarm
will occur if the discharge temp sensor 2 measures less than -40
degrees F or more than 356 degrees F. This will cause an alarm and
will shut down the compressor (relay). The system will retry after 5
minutes.
COMPRESSOR (COMP) 1 CUTOFF: This alarm will occur if the
discharge temp sensor 1 measures more than 265 degrees F. This will
cause an alarm and will shut down the compressor (relay). The system
will can be restarted after 30 minutes.
COMPRESSOR (COMP) 2 CUTOFF: This alarm will occur if the
discharge temp sensor 2 measures more than 265 degrees F. This will
cause an alarm and will shut down the compressor (relay). The system
will can be restarted after 30 minutes.
COMPRESSOR (COMP) 1 or 2 LOCKOUT: If active cutoff oc-
curs 5 times within a 4 hour period, the compressor will be locked out.
Must cycle power to RSMD to clear the alarm.
• If a circuit’s Suction Pressure falls below the Low Suction
Pressure Setpoint for longer than one minute twice within a
two hour window, the compressor on that circuit will be
locked out. Manual reset or change of mode is required to
return to normal operation.
• If the Suction Pressure falls below the Unsafe Suction
Setpoint for 5 seconds, that circuit’s compressor will locked
out. Power will need to be cycled to restart the unit.
• If the Leaving Water Temperature falls below setpoint,
the last compressor will be locked out until the Leaving Water
Temperature rises 6 degrees above setpoint.
• The Leaving Water Temperature remains below setpoint for
1 minute or falls 3 degrees below setpoint. This alarm will
disable when the leaving water temperature rises 12 degrees
above the setpoint.
NO PROOF OF H2O FLOW: There is a call for a compressor and
there is no Proof of Flow Input Enable for more than 3 minutes or if dur-
ing Heat Pump heating, the Proof of Flow Enable is open for more than
2 seconds. This alarm will disable when Proof of Flow is enabled.
LOW H2O TEMPERATURE: If both compressors are on and water
temp goes below setpoint, compressor 2 will fail. If both compressors
are on and water temp goes 3 degrees below setpoint, both compres-
sors will fail. If second compressor is off or failed and water temp is still
low for 1 minute, the fi rst compressor will also fail. This alarm will disable
when the leaving water temperature rises 6 degrees above the setpoint.

AAON RSMD Specifications

General

Brand	AAON
Model	RSMD
Category	Controller
Language	English