Orion System SA Controller - Manual (Page 26)

Zone
Zone
Programming
SA Controller Operator Interface 26
SA Controller Setpoint Screens
Setpoint Screen #1 - HVAC Mode Setpoints
SA Unit Spts ID 102
HVAC Mode Setpoints
Cooling......: 75ºF
Heating......: 70ºF
These Setpoints are used to determine the Heating, Cooling, or Vent
Modes of operation in reference to the HVAC Mode Enable Sensor.
If the Supply Air Sensor is confi gured to be the HVAC Mode Enable,
these Setpoints are used in conjunction with the Unoccupied Setbacks
if equipped with a Space Temperature Sensor.
Description Minimum Default Maximum
HVAC Mode Setpoints Cooling 0ºF 75ºF 99ºF
HVAC Mode Setpoints Heating 0ºF 70ºF 99ºF
Setpoint Screen #2 - HVAC Mode Select
Deadband
SA Unit Spts ID 102
HVAC Mode Select
Deadband....: 1.0ºF
This Setpoint is added to and subtracted from the HVAC Mode Setpoints.
It provides you with fl exibility on when the Heating and Cooling Modes
should be active above or below the HVAC Mode Setpoints.
Description Minimum Default Maximum
HVAC Mode Select Deadband 0ºF 1ºF 10ºF
Setpoint Screen #3 - Unoccupied Setbacks
SA Unit Spts ID 102
Unoccupied Setbacks
Cooling.........: 30ºF
Heating.........: 30ºF
During the Unoccupied Mode of Operation, these Setpoints spread the
HVAC Mode Setpoints out by a user-adjustable amount. Use only posi-
tive numbers for these Setpoints. If you do not want Cooling or Heating
to operate during the Unoccupied Mode, use the default setting of 30°F
for these setpoints.
Description Minimum Default Maximum
Unoccupied Setbacks Cooling 0ºF 30ºF 30ºF
Unoccupied Setbacks Heating 0ºF 30ºF 30ºF
Setpoint Screen #4 - SAT Cooling Setpoints
SA Unit Spts ID 102
SAT Cooling Spts
Cooling..: 55ºF
Rst Limit: 55ºF
If no Reset Source has been confi gured in Confi guration Screen #4, then
this setpoint will be the Supply Air Temperature Cooling Setpoint. Line
4 will be blank. If a Reset Source has been confi gured in Confi guration
Screen #4, then Line 4 will read Rst Limit. Reset is always upward from
the SAT setpoint to the Reset Limit setpoint. So, the SAT will be the
lowest temperature the Supply Air Setpoint can be reset to and Reset
Limit will be the highest temperature the Supply Air Setpoint can be
reset to. The Cooling Supply Air Temperature Setpoint will automati-
cally be reset warmer or colder within this range as the Reset Source
(next screen) moves within its range.
Description Minimum Default Maximum
SAT Cooling Setpoint 30ºF 55ºF 80ºF
Cooling Reset Limit 40ºF 55ºF 200ºF
Setpoint Screen #5 - Cool Reset Source
SA Unit Spts ID 102
Cool Rst Source Spts
EntHi: 75 SAT: 55º
EntLo: 75 RST: 55º
If no Reset Source has been confi gured in Confi guration Screen #4,
then this screen will read Cool Rst Not Confi g and will not be used. If
a Reset Source has been confi gured in Confi guration Screen #4, then
the names of the values on the left side of this screen will correspond to
the Reset Source that was confi gured. This screen will then allow you
to input the upper and lower limits for the range of values of the Reset
Source on the left side of the screen and will show the corresponding
Cooling Supply Air SAT and Rst Limit values that were entered on the
previous screen. Single Zone VAV Reset of the Supply Fan VFD is ad-
dressed in the last paragraph.
Please note that the SAT and Rst Limit values on the right side of this
screen cannot be changed on this screen; they are simply displayed from
what was entered on the Setpoint Screen #4. For each line, the value on
the left corresponds to the value on the right. So, if the Space Temperature
Sensor has been confi gured as the Reset Source, then when the Space
Temperature is at or above the SpcHi Temperature Setpoint, the Supply
Air Cooling Setpoint will be reset to its lowest value, the SAT Setpoint.
If the Space Temperature is at or below the SpcLo Setpoint, the Supply
Air Cooling Setpoint will be reset to its highest value, the Cooling Rst
Limit. Then, as the Space Temperature moves from its low value to its
high value, the Supply Air Cooling Setpoint will be proportionally reset
from its high value to its low value.