Engineered air base, User Manual

Page: 11 / 12

A base
IOM67 11 February 2021 R0
ALARMS
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. 4 minute bypass
time.
02
Air Proving
Fault
VFD Feedback is greater
than the minimum VFD
speed for more than 30s
with the supply fan output
off.
03
Shorted Air
Proving Air SA Proving switch
shorted on start up.
04 Low airflow
Air Proving switch opens
during operation for 30s
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 for
10s.
06
Ambient Air
Sensor Failure Outdoor Ambient sensor
is outside of range for 10s.
07
Damper End
Switch Short
The damper end switch is
made before energizing
the damper output.
08
Damper End
Switch Open
Indication damper end
switch not made after
actuator is energized.
09 Communication
Loss of communication to
CD-XM (if used).
Heating 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.
Timed event.
86 High Limit
High limit safety tripped
due to excessively high
temperature.
87
Flame Relay
Wiring
Received a gas valve
feedback within 500ms of
activating the Flame relay
output.
88 Flame Failure
Gas valve feedback has no
power after 1 minute of
enabling the Flame relay
output.
DJ/SH(X) Alarms
82
RPM out of
range
Combustion blower motor
RPM is greater or less
then the demand.
Timed event.
83
Open Air
Proving
Combustion blower does
not exceed 3000 rpm
during purge.
84
Combustion Air
Proving
Combustion rpm speed
sensor has a value greater
than 500 rpm for 60
seconds before the
combustion blower has
been commanded on.
85
Plugged
Condensate
Blocked condensate
sensor reads less then 7kΩ
for more than 5 minutes.
89 Blocked Flue
Blocked flue input is open
for more than 1 minute.
90 60 Hz
Combustion blower
frequency has exceeded
60 Hz ( 3590 RPM)
DG Alarms
82
Air Actuator
Out of range
Air Actuator Feedback Is
greater or less then the
demand. Tolerances and
timing vary depending on
mode of operation.