User`s guide

4-38 Display Terminals
The values of the various parameters shown on the Optimal Start
screens are read from the DX controller. Table 4-8 gives a short
description of the Optimal Start/Stop parameters. Refer to
DX controller documentation if further explanation is required.
Table 4-8: Optimal Start/Stop Parameters
Parameter Description
Zone Temperature
This number, expressed in degrees, is the desired zone
temperature at the scheduled occupancy time.
Stop Mode Bias
This number, expressed in degrees, defines the maximum
change in zone temperature allowed during the optimal
stop period. When the operating mode is heating and
cooling, the number applies to both modes.
Minimum Startup
(Minutes)
This parameter defines the minimum time that the air
handling unit or other equipment should begin operating
before occupancy (minutes).
Maximum Startup
(Minutes)
This parameter defines the time period (minutes) given for
the module to calculate when to start heating or air
conditioning equipment before occupancy. The module
looks at occupancy time minus current time, then begins
calculation when equal to the maximum startup time.
Maximum Optimal
Stop (Minutes)
This number, expressed in minutes, is used as the stop
time if the calculated stop time exceeds this number.
Start Mode Building
Factor Heating
This factor, expressed in minutes/degrees squared,
defines the initial building factor for the first Optimal Start
heating calculation. It is automatically updated by the
module when adapting is enabled.
Start Mode Building
Factor Cooling
This factor, expressed in minutes/degrees squared,
defines the initial building factor for the first Optimal Start
cooling calculation. It is automatically updated by the
module when adapting is enabled.
Stop Mode Building
Factor Heating
This factor, expressed in minutes/degrees, defines the
building factor for the Optimal Stop heating calculation.
Stop Mode Building
Factor Cooling
This factor, expressed in minutes/degrees, defines the
building factor for the Optimal Stop cooling calculation.
Adaptive Filter (%)
This number, expressed in percent, defines the proportion
of the latest calculated factor used to update the stored
building factor. For example, 1% is a slow update
(100 days); 10% is a relatively fast update (10 days);
0% stops the update of building factors.
Outdoor Design
Heating
This number, expressed in degrees, defines the coldest
outdoor temperature that the heating equipment is
designed to handle. When the outdoor air is below this
value, the module does not update the building factors.
Outdoor Design
Cooling
This number, expressed in degrees, defines the warmest
outdoor temperature that the cooling equipment is
designed to handle. When the outdoor air is above this
value, the module does not update the building factors.
Control Range
This number, expressed in degrees, defines the
temperature band above and below the zone air
temperature setpoint within which the heating/cooling
equipment is regulated.