TCS Basys Controls SZ2165 Product Manual page 5

SetPointS
Enter Occupied and Unoccupied tem-
perature setpoints for Hot Water Supply,
Chilled Water Supply, Mixed Water,
Hot Water Return and Analog Input
(Pressure). Also enter a High and Low
Limit for each setpoint, if desired.
ReSet
The analog outputs and digital output
stages on the SZ2165 can be setup
to use a reset function. This is done
by placing a check in the appropriate
Enable Reset box. When using the reset
function, the Hot Water Supply, Chilled
Water Supply, Mixed Water, Hot Water
Return and/or Analog Input (Pressure)
are the Primary temperature inputs and
the Outdoor Air Temperature is the Reset
input.
You need to enter a primary occupied
and unoccupied setpoint in the Setpoints
section above. These setpoints will be
adjusted up and down based on the out-
door air temperature, the reset setpoint
and the reset factor. The analog output(s)
and digital output(s) will be controlled
using these calculated setpoint(s).
You need to enter a reset setpoint. A
comparison between the outdoor air
temperature and this setting will be used
in determining the calculated setpoint for
each respective input.
You need to enter a reset ratio factor. This
is the number of units that the respective
input setpoint is raised when the outdoor
air temperature falls below the reset set-
point by 1 unit, or the number of units that
the respective input setpoint is lowered
when the outdoor air temperature rises
above the reset setpoint by 1 unit.
example - A hot water valve is controlled using an outdoor air reset
schedule. If the outdoor air temperature is 0°F, the hot water tem-
perature is controlled at 200°F. If the outdoor air temperature is 60°F,
the hot water temperature is controlled at 80°F.
The hot water supply temperature setpoint is set to 140.
(200 + 80) / 2 = 140
The reset setpoint for the hot water supply temperature is set to 30.
(0 + 60) / 2 = 30
The reset factor for the hot water supply temperature is set to 2.
(200 - 80) / (60 - 0) = 120 / 60 = 2
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oUtPUtS
For the Pump Outputs you need to enter an Occupied and
Unoccupied Outdoor Air Temperature Setpoint.
For a Cooling output (Chiller Stage(s)) the relay energizes when the
input equals the Chilled Water Setpoint + Offset + Differential and de-
energizes when the input falls to the Chilled Water Setpoint + Offset.
For a Heating output (Boiler Stages) the relay energizes when the
input equals the Hot Water Setpoint - Offset - Differential and de-
energizes when the input rises to the Hot Water Setpoint - Offset.
Enter the Offset and Differential values here.
deLAYS
Enter the Minimum ON and Minimum OFF times (in seconds) here
for all of the output stages, as well as a Purge Time and Minimum
ON and OFF times (in minutes) for the Loop pump. A Purge Time
is the amount of time (in minutes) that the pump will continue to run
after all of the stages are off.
BoiLeR ContRoL
The boiler can be controlled by either Hot Water Supply Temperature
or by Gauge Pressure. Choose the signal that the boiler will be con-
trolled from. Note - all outputs (Analog and Digital) will be controlled
based on this decision.
miXed WAteR
If using a valve to control mixed water temperature, place a check in
the "Enable Mixed Water Control" checkbox. When you do this, AO1
will be used to control the Mixed Water Temperature independent of
Hot Water or Chilled Water control.
R
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