EngA ENGINEERED AIR base - Alarms

base A
31
IOM74 November 2020 R105
ALARMS
When an alarm condition exists, the base will flash the RED LED and show a number on the right 2 seven
segment displays. The first (left) seven segment LED describes the current operating mode, as:
1 = Ventilation
2 = Economizer
3 = Heating
4 = Cooling
The two seven segment LED on the right side show the current alarm reference number.
LED
Name
Description
General Alarms
01 Low limit
The low limit setpoint is the lower of 40°F or 15°F below the discharge air
setpoint.
02 Air Proving Fault
VFD Feedback is greater than the minimum VFD
speed for more than 30
seconds with the supply fan output off.
03
Shorted Air
Proving
Air SA Proving switch shorted on startup.
04 Low airflow
Air Proving switch opens during operation for 30 seconds or the VFD feedback
drops below the minimum speed for 30 seconds.
05
Discharge Air
Sensor Failure
Discharge Air sensor is outside of its range (
-
60°F to 220°F) for 10 seconds or
more.
06
Ambient Air
Sensor Failure
Outdoor Ambient sensor is outside of range (
-
60°F to 220°F) for 10 seconds or
more.
07
Damper End
Switch Warning
Shorted damper end switch. Meaning the damper end switch is made before
energizing the damper output.
08
Damper
Mechanical Alarm
End switch enabled codex is true and end switch is not made after energizing
damper output.
09 Communication
Loss of communication between base and CD-XM expansion module.
DJ Alarms
80 Gas Valve Wiring
Gas valve feedback has power before the FR and SR contact are energized.
81
Gas Valve out of
range
Gas valve actuator feedback is greater or less
than
the demand. Tolerances
and timing vary depending on mode of operation.
82 RPM out of range
Combustion blower motor RPM
is greater or less
than
the demand. Tolerances
and timing vary depending on mode of operation.