Carrier 48/50HC04---14 Controls, Start-Up, Operation And Troubleshooting Instructions page 25

The following values are related to the Space Temperature
alarm:
Alarming Temperature – This variable displays the
value of the space temperature that is in alarm and is only
visible when the space temperature is in an alarm state.
Alarm Limit Exceeded – This variable displays the value
of the alarm setpoint that is exceeded by the alarming
space temperature and is only visible when the space
temperature is in an alarm state.
High Supply Air Temperature
This alarm indicates the supply air temperature exceeds
the alarm configuration High SAT Alarm Limit for 5
minutes. This alarm is inhibited until the RTU has been
running for 30 minutes to allow for system stabilization
after startup.
Low Supply Air Temperature
This alarm indicates the supply air temperature falls
below the alarm configuration Low SAT Alarm Limit for
5 minutes. This alarm is inhibited until the RTU has been
running for 30 minutes to allow for system stabilization
after startup.
Setpoint Slider
This alarm indicates an open circuit is detected at the
setpoint adjustment input.
Space Sensor Type is set to T56. Note that only an open
circuit results in an alarm. A short across this input offsets
the setpoints negatively by the amount configured by
configuration Setpoint Adjustment Range.
Switch Configuration
This occurs if more than one binary input (inputs 3, 5, 8,
and 9) is configured for the same function. When this
happens the two inputs (or more) configured wrong will
be disabled as an inputs. This alarm will automatically be
cleared when configuration is corrected.
An example of this would be: Input 3 = Compressor
Safety, input 5 = Fan Status, input 8 = Fan Status, and
input 9 = Humidistat; the alarm would be active, unit
would run, compressor safety and humidistat would
function normally, and Fan Status (inputs 5 & 8) will be
interpreted as "No Function."
Analog Input Configuration
This occurs if more than one analog input (inputs 1 & 2)
is configured for the same sensor. When this happens the
two inputs will be disabled as inputs. This alarm will
automatically be cleared when configuration is corrected.
An example of this would be: Input 1 = IAQ Sensor, input
2 = IAQ Sensor; the alarm would be active, unit would
run, but the IAQ Sensor (inputs 1 & 2) will be interpreted
as "No Function."
High Space Relative Humidity
This alarm indicates the space humidity exceeds the alarm
configuration High Space Humidity Alarm Limit for 10
minutes. This alarm is inhibited until the RTU runs for 15
minutes to allow for system stabilization after startup.
This can only occur if the
Low Space Relative Humidity
This alarm indicates the space humidity falls below the
alarm configuration Low Space Humidity Alarm Limit for
5 minutes. This alarm is inhibited until the RTU runs for 5
minutes to allow for system stabilization after startup.
High CO
2
This alarm indicates the space CO
alarm configuration Occupied High CO
1-minute. This alarm will be inhibited until the RTU has
been running for 2-minutes to allow for system
stabilization after startup.
Supply Fan Runtime
This alarm indicates the accumulated runtime exceeds the
unit configuration Supply Fan Service Alarm Timer value
(when not set to 0). This alarm is most commonly used to
indicate an equipment maintenance interval is due. The
supply fan runtime accumulator may be reset by setting
the maintenance point Reset Supply Fan Runtime Alarm
to Clear, and then back to Run – acknowledging each
selection by clicking the OK button when it appears.
Setting unit configuration Supply Fan Service Timer value
to 0 disables the supply fan runtime alarm function.
Compressor 1 Runtime
This alarm indicates the accumulated runtime exceeds the
unit configuration Compressor 1 Service Alarm Timer
value (when not set to 0). This alarm is most commonly
used to indicate an equipment maintenance interval is due.
The Compressor 1 Runtime accumulator may be reset by
setting the maintenance point Reset Comp 1 Runtime
Alarm to Clear, and then back to Run – acknowledging
each selection by clicking the OK button when it appears.
Setting unit configuration Compressor 1 Service Timer
value to 0 disables the Compressor 1 Runtime alarm
function.
Compressor 2 Runtime
This alarm indicates the accumulated runtime exceeds the
unit configuration Compressor 2 Service Alarm Timer
value (when not set to 0). This alarm is most commonly
used to indicate an equipment maintenance interval is due.
The Compressor 2 runtime accumulator may be reset by
setting the maintenance point Reset Comp 2 Runtime
Alarm to Clear, and then back to Run – acknowledging
each selection by clicking the OK button when it appears.
Setting unit configuration Compressor 2 Service Timer
value to 0 disables the Compressor 2 runtime alarm
function. Note that this function is unavailable if the
service configuration Compressor Stages value is not set
to Two Stages.
Filter
This alarm indicates the accumulated runtime exceeds the
unit configuration Filter Service Alarm Timer value
(when not set to 0). This alarm is most commonly used to
indicate a filter replacement is due. Reset the filter service
runtime accumulator by setting the maintenance point
Reset Filter Runtime Alarm to On, back to Off, and
clicking the OK button after each setting. Setting unit
configuration Filter Service Alarm Timer value to 0
disables the filter service alarm function.
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level exceeds the
2
Alarm Limit for
2