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EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER
Name of alarm or error bit
NO_ALARM
INPUT_NV_FAILURE
NODE_DISABLED
SENSOR_FAILURE
FROST_PROTECTION_ALARM 4
INVALID_SET_POINT
LOSS_OF_AIR_FLOW
DIRTY_FILTER
SMOKE_ALARM
IAQ_OVERRIDE
LOW_LIM_ECON_CLOSE
DRIP_PAN_FULL
FREEZE_STAT
OAQ_ALARM
RETURN_TO_NORMAL
ALARM_NOTIFY_DISABLED
NOTE: The node can be reset by switching the node to MANUAL and then switching to the normal operating mode
(using DestManMode).
Also, the Excel 10 network variables, AlarmLogX, where X is 1 through 5, that store the last five alarms to occur in the
controller, are available. These points can be viewed through XBS, XI584 or E-Vision.
95-7520—02
Table 1. Excel 10 Alarms.
Alarm type
number
0
No alarms presently detected.
1
One or more NV inputs have failed while receiving an update within their
specified FAILURE_DETECT_TIME.
2
The control algorithm stopped because the controller is in DISABLED_MODE,
or FACTORY_TEST mode. The control is shut down and disabled until power is
cycled or the node is reset. See NOTE 1 below.
3
One or more sensors have failed.
The space temperature is below the frost alarm limit 42.8 F (6 C) when the
mode is FREEZE_PROTECT. The alarm condition remains until the
temperature exceeds the alarm limit plus hysteresis.
5
One of the Setpoints is not in the valid range.
6
The Fan Status DI indicates that there is no air flow when the node is
commanding the fan to run. The control is shut down and disabled until power is
cycled or the node is reset. The alarm is not issued until FanFailTime seconds
have elapsed since the loss-of-flow condition was first reported.
7
The pressure drop across the filter exceeds the limit and the filter requires
maintenance. The control runs normally.
8
The smoke detector has detected smoke and the node has entered an
emergency state.
9
The indoor air quality sensor has detected that the indoor air quality is poorer
than the desired standard and additional outdoor air is being brought into the
conditioned space.
10
The economizer has to close beyond the minimum position to prevent the
discharge air temperature from going below the discharge temperature low
limit.
11
Drip pan maintenance is required. Cooling control is disabled. Fan continues to
run.
12
Very Cold Temperature detected inside the Unit Ventilator Cabinet. Control
closes OA Damper, and open heat valve.
13
The configured outdoor air quality sensor has detected CO or CO
exceeds OaQStPt (plus 30 ppm hysteresis). When there is an OAQ_ALARM,
the economizer damper is closed.
128
Return to no alarm after being in an alarm condition. This code is added
numerically to another alarm code to indicate that the alarm condition has
returned to normal.
255
The alarm reporting was turned off by the nviManualMode. No more alarms are
reported until nviManualMode turns on alarm reporting or upon application
restart.
10
2
levels that
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