Control Operation Overview Chore-Tronics® 2 Control
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MT1843B
of the Alarm Limits for 1 minute of accumulated Fan run time. Any reading
within the alarm limits while a Fan or Fans are running resets the
accumulated run time to zero. For the case where the only Fans running are
cycling with a Timer, it can take more than one cycle of the Timer for the
alarm to happen. This is true when the “on” time of the Timer is less than 1
minute. The “off” time of the Timer does not add to the accumulated “on”
time.
Pressure Failure
If the pressure measurement gets outside of the Static Pressure range of -.05
to 0.40 continuously for 1 minute, regardless of the Fans on/off status, a
static pressure failure alarm will happen. The Inlets will be given continuous
open signals if this occurs.
Low Water Pressure
An optional mechanical water pressure switch can be attached to the left 2
terminals of the D2 input to the I/O board in order to detect a low water
pressure condition. The switch contacts need to be closed when the pressure
is above a safe lower limit. In the "Setup" screen you can program an alarm
delay time in order to screen out transient low water pressure conditions. The
Low Pressure Switch alarm is set at the factory to come on at 5 PSI and goes
back off when the pressure rises above 10 PSI.
Program # Activated
Activating a program in the "Programs" screen does not represent a hazard,
but it is very helpful to evaluate where you have been in terms of the
program(s) used. The alarm history shows activity of program activation.
The alarm light will flash, and when you NOTICE the alarm message, it will
disappear to the alarm history. The Alarm Relay does not change to the alarm
state.
Pot # Not Responding (Natural ventilation only)
This alarm is generated whenever 2 minutes of open or close time does not
result in at least 10 counts of change to the pot readout. Changing direction
resets the 2 minute Timer. This alarm is also generated if there are 10 or
fewer counts to the pot readout during the first opening transition. The 2
minute Timer does not advance and is reset to zero whenever the pot readout
is within 10% of either calibration limit.
Pot # Outside Limits (Natural ventilation only)
This alarm is generated whenever the pot readout is more than 10% past the
calibration limit at either end.
Listed below are additional alarm codes that relate to the internal operation
of the Control. Contact Agile Manufacturing service personnel, if any of
these alarms occur.
Min/Max Spare Sensor Alarm
If the optional Spare Temperature sensor is connected to the Control, then a
Maximum and Minimum temperature alarm can be defined for this sensor.
The alarm temperature setting is an absolute temperature (The actual desired
alarm temperature is entered, as opposed to being relative to set
temperature). The alarm occurs when the spare temperature sensor reaches
the alarm temperature setting and remains at or beyond that temperature for
one minute.
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