Alarms - EngA ENGINEERED AIR base Technical Manual

base

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
General Alarms
01 Low limit
02 Air Proving Fault
Shorted Air
03
Proving
04 Low airflow
Discharge Air
05
Sensor Failure
Ambient Air
06
Sensor Failure
Damper End
07
Switch Warning
Damper
08
Mechanical Alarm
09 Communication
DJ Alarms
80 Gas Valve Wiring
Gas Valve out of
81
range
82 RPM out of range
IOM74
Description
The low limit setpoint is the lower of 40°F or 15°F below the discharge air
setpoint.
VFD Feedback is greater than the minimum VFD speed for more than 30
seconds with the supply fan output off.
Air SA Proving switch shorted on startup.
Air Proving switch opens during operation for 30 seconds or the VFD feedback
drops below the minimum speed for 30 seconds.
Discharge Air sensor is outside of its range (-60°F to 220°F) for 10 seconds or
more.
Outdoor Ambient sensor is outside of range (-60°F to 220°F) for 10 seconds or
more.
Shorted damper end switch. Meaning the damper end switch is made before
energizing the damper output.
End switch enabled codex is true and end switch is not made after energizing
damper output.
Loss of communication between base and CD-XM expansion module.
Gas valve feedback has power before the FR and SR contact are energized.
Gas valve actuator feedback is greater or less than the demand. Tolerances
and timing vary depending on mode of operation.
Combustion blower motor RPM is greater or less than the demand. Tolerances
and timing vary depending on mode of operation.
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A
November 2020 R105