Taco Electronic Solutions iWorx MPU2, Application Manual

Page: 39 / 42

iWorx® MPU2
505-009, Effective: June 30, 2015 39
© 2015 Taco Electronic Solutions, Inc.
IAQ Sensor
If the IAQ Mode is set to Analog, this parameter structure needs to be configured.
OAT Cutoff
The OAT cutoff temperatures are temperatures above or below heating or cooling function is disabled and the econo-
mizer is reduced to the MinAir position.
Note: A value of -4
°F disables this cutoff temperature setting. All other values within the range are valid cutoff temperatures.
Alarms
The table below describes the alarms you may encounter and how they are reset.
Setting Range Default Description
Min 0 to 4000 ppm 0 ppm Minimum ppm sensor setting
Max 0 to 4000 ppm 0 ppm Maximum ppm sensor setting
Setpoint 0 to 4000 ppm 0 ppm Setpoint
Offset 0 to 4000 ppm 0 ppm Offset to the sensor reading
Setting Range Default Description
Max OAT Heat -7.6 to 122 °F
(-22 to 50
°C)
-4 °F
(-20
°C)
Outside Air Temperature above
which heating is disabled. See Note
below.
Min OAT Cool -7.6 to 122 °F
(-22 to 50
°C)
-4 °F
(-20
°C)
Outside Air Temperature below which
cooling is disabled. See Note below.
Max OAT Econ -7.6 to 122 °F
(-22 to 50
°C)
-4 °F
(-20
°C)
Outside Air Temperature above
which economizer is disabled. See
Note below.
Min OAT Econ -7.6 to 122 °F
(-22 to 50
°C)
-4 °F
(-20
°C)
Outside Air Temperature below which
economizer is disabled. See Note
below.
SAT Cooling Limit 45 to 75 °F
(7.2 to 23.9
°C)
55 °F
(12.8
°C)
Supply air temperature below which
additional cooling will not be enabled.
See Note below.
Alarm Range Alarm Trigger Alarm Reset
Fan Failure Normal, Alarm Occurs when the fan input detects
that the fan is not running after a
30-second grace period after the
fan has been activated. The cause of the emergency condition
must be resolved and the controller
must be reset.
Smoke Normal, Alarm Occurs when the smoke alarm
input detects the presence of
smoke. The cause of the emergency condition
must be resolved and the controller
must be reset.
Mixed Air Low Limit Normal, Alarm Occurs when the mixed air tem-
perature drops below the Low
Limit that has been set, indicating
a freeze condition. The cause of the emergency condition
must be resolved and the controller
must be reset.
Filter Normal, Alarm Occurs when the Filter Alarm input
detects that the filter needs to be
replaced. Automatic when the dirty filter is
replaced.
Indoor Air Quality Normal, Alarm Occurs when the IAQ sensor
detects inadequate indoor air qual-
ity. Automatic when air quality returns
within normal parameters.