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Cooling
type
DAT Limit
Gains
Fan Delay
Managing Cooling options
Figure 52 Cooling options
Table 24: Cooling options
Configuration
Range
Type
DAT Cooling Low
-40 to 60°F
Limit
(Default 45°F)
Throttling Range 0 to 30°F
(Default 4°F)
Cooling Integral
0 to 5000 Sec
Time
Default 2500
Sec
Fan Off Delay
0-180 Sec
Time
MANAGING COOLING OPTIONS
Description
When the discharge air temperature is below the
discharge air low limit setpoint, the cooling control
will turn off cooling physical output until the
discharge air temperature rises above it's setpoint +2
°F differential.
The throttling range is the amount of change in the
sensed temperature required to drive the output
from 0 to 100%. The throttling range must be narrow
enough to provide good control without becoming
unstable.
The throttling range is determined by factors
including: the control application, heating or cooling
capacity of the equipment relative to the physical
size of the space being controlled, and the control
algorithm being used. The narrower (smaller) the
throttling range, the more precise the control and the
wider (larger) the throttling range, the more stable
the control. The objective is setting the throttling
range to achieve the optimum balance between
precision and stability.
The amount of time the error has continued
uncorrected. Integral action corrects the
temperature control errors of proportional-only
control, but it
is slower to react to large temperature or setpoint
changes.
Fan run on time after all cooling outputs are turned
off. May be used to run fan after all cooling outputs
have turned off so that the cooling coil can warm up
before the fan turns off to prevent condensation
from evaporating into the space.
73
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