Specifications

16
STAGED COOLING — The staging function is used for DX
(direct expansion) cooling (1 or 2 stages). The staging function
uses the cooling submaster reference from the PID and com-
pares the value to the supply air temperature to calculate the
required number of output stages to energize.
Time Guard delays are provided to allow for up to 2 stages
of compression. Also, a DX Lockout will prevent operation
of the DX cooling if the outdoor air temperature is below this
value.
The cooling algorithm controls the valve or stages of DX
cooling to prevent the space temperature from exceeding the
current cooling set point (which includes any calculated offset
value from a T56 sensor slide bar during occupied periods).
Also, the cooling is controlled so that the supply air tempera-
ture does not fall below 50 F when cooling is active.
Number of Stages: Range: 1 to 3
Default Value: 2
The Time Guards must be set to Enable for output to a
compressor, and set to Disable for output to a valve or
compressor unloader.
Stage 1
Time Guard: Range: Disable/Enable
Default Value: Enable
Stage 2
Time Guard: Range: Disable/Enable
Default Value: Enable
Stage 3
Time Guard: Range: Disable/Enable
Default Value: Disable
HEATING PID — The PremierLink controller determines if a
heating demand exists in the space. The controller reads the
space temperature sensor and compares the temperature to the
current low set point (including any calculated offset value
from a T56 or T57 sensor) during occupied periods. If it is
below the set point, and heating is configured and available, it
then calculates the required supply air temperature to satisfy
the given conditions. The calculated value (heating submaster
reference) is compared to the actual supply-air temperature and
the output is then adjusted to satisfy conditions by using a
Proportional/Integral/Derivative (PID) loop.
The Heating PID includes the following set points: Propor-
tional Gain, Integral Gain, Derivative Gain, and Starting Value.
Proportional Gain: Range: –100.0 to 100.0
Default Value: 6.0
Integral Gain: Range: –5.0 to 5.0
Default Value: 3.0
Derivative Gain: Range: –20.0 to 20.0
Default Value: 5.0
Starting Value: Units: Degrees F
Range: 40.0 to 120.0
Default Value: 75.0
STAGED HEATING — The Staged Heating function is used
for two-position valves or for electric heat (1 or 2 stages). The
staging function uses the heating submaster reference value
from the PID and compares it to the supply air temperature to
calculate the required number of output stages to energize.
Number of Stages: Range: 1 to 3
Default Value: 2
Stage 1
Time Guard: Range: Disable/Enable
Default Value: Enable
Stage 2
Time Guard: Range: Disable/Enable
Default Value: Enable
Stage 3
Time Guard: Range: Disable/Enable
Default Value: Enable
IAQ PID — The proportional gain affects the response of PID
calculations for staged control. The gain is also used for two
position control to establish the hysteresis between on and off.
A larger gain speeds response time or reduces the hysteresis,
while a smaller gain requires a larger error to generate the same
response to changes in Indoor Air Quality. Enter the desired
proportional gain for the Indoor Air Quality control algorithm.
The integral gain affects the PID calculation; an increase
will make the IAQ submaster reference change greater as the
error in indoor air quality increases. The integral gain should be
selected to eliminate proportional droop without overshoot.
Enter the desired integral gain for the Indoor Air Quality con-
trol algorithm.
The Derivative Gain is typically not required for Indoor Air
Quality operation and should be left at the default value.
The Starting Value is used to establish the starting value for
the IAQ PID calculation.
The IAQ PID includes the following set points: Proportion-
al Gain, Integral Gain, Derivative Gain, and Starting Value.
Proportional Gain:Range: –100.0 to 40.0
Default Value: 1.0
Integral Gain: Range: –5.0 to 5.0
Default Value: 0.5
Derivative Gain: Range: –20.0 to 20.0
Default Value: 0.0
Starting Value: Units: Percent
Range: 0.0 to 100.0
Default Value: 0.0
ECONOMIZER PID (NOT USED) — The proportional gain
determines the response of the PID temperature control loop; a
larger gain increases the amount of damper movement while a
smaller gain requires a larger error to achieve the same results.
The integral gain affects the response of a PID calculation;
an increase in gain will compensate more quickly for propor-
tional control droop. Too large of an integral gain will cause
excessive damper positioning and instability. Enter the desired
integral gain for the damper control algorithm.
The economizer derivative gain has been tested for ideal
operation in sensor mode and should be left at the default value.
NOTE: In thermostat mode, the modulation may appear to
regularly change. However, it will precisely control leaving-air
temperature.
The economizer Starting Value is used to establish the start-
ing value for the damper PID calculation. The value entered is
determined by the mass of the zone. Typically a value of 10%,
the default, will be adequate for most applications. For higher
mass areas, such as a stone lobby, the value may be increased
to 20 to 25%.
The Economizer PID includes the following set points:
Proportional Gain, Integral Gain, Derivative Gain, and Starting
Va l u e .
Proportional Gain: Range: –100.0 to 100.0
Default Value: –4.0
Integral Gain: Range: –5.0 to 5.0
Default Value: –2.0
Derivative Gain: Range: –20.0 to 20.0
Default Value: –3.0
Starting Value: Units: Degrees (F)
Range: 48.0 to 120.0
Default Value: 70.0