Unitary | Pre-APOGEE | APOGEE | BACnet | PXC.A |
|---|---|---|---|---|
| ● | ● | ● | ● |
Syntax
STTOCO(zone,season,intemp,outemp,ctemp,ccoef1,ccoef2, ccoef3,ccoef4,htemp,hcoef1,hcoef2,hcoef3,hcoef4)
NOTE:
For variables used in the command, you can use numbers, point names, or local variables.
zone | SSTO zone number. - Valid values are 1 to 5. |
season | Current season. Point name whose value represents the coefficients to be used. - Heat = 2 - Cool = 1 - Disable SSTO = 0 |
intemp | Point name or average of indoor zone temperature sensor. |
outemp | Point name or average of outdoor air temperature sensor. |
ctempt | Desired zone temperature for cooling season. - This parameter can be a floating point (decimal) number, an integer, a point name, or a local variable. |
ccoef1 | Cooling coefficient. The time, in hours, required to lower the zone temperature one degree while ignoring external load factors. - This value must be entered in fractions of an hour. |
ccoef2 | Cooling retention coefficient. The time, in hours, required to raise the zone temperature one degree with the cooling equipment off, outside air dampers open, and the outside temperature 10 degrees higher than the desired zone temperature for the cooling season. - This value must be entered in fractions of an hour. |
ccoef3 | Cooling transfer coefficient. The time, in hours, required to lower the zone temperature one degree with outside air dampers closed and the outside temperature 10 degrees higher than the desired zone temperature for the cooling season. - This value must be entered in fractions of an hour. |
ccoef4 | Cooling auto-tune coefficient. The time, in hours, added to or subtracted from the adjusted time (ast or asp) in the SSTO command as part of the self-tuning feature. - This value must be entered in fractions of an hour. |
htemp | Desired zone temperature for heating season. - This parameter can be a floating point (decimal) number, an integer, a point name, or a local variable. |
hcoef1 | Heating coefficient. The time, in hours, required to raise the zone temperature one degree while ignoring external load factors. - This value must be entered in fractions of an hour. |
hcoef2 | Heating retention coefficient. The time, in hours, required to lower the zone temperature one degree with the heating equipment off, outside air dampers open, and the outside temperature 25 degrees lower than the desired zone temperature for the heating season. - This value must be entered in fractions of an hour. |
hcoef3 | Heating transfer coefficient. The time, in hours, required to raise the zone temperature one degree with outside air dampers closed and the outside temperature 25 degrees lower than the desired zone temperature for the heating season. - This value must be entered in fractions of an hour. |
hcoef4 | Heating auto-tune coefficient. The time, in hours, added to or subtracted from the adjusted time (ast or asp) in the SSTO command as part of the self-tuning feature. - This value must be entered in fractions of an hour. |
Use
This command defines the thermal characteristics of a zone based on the season, indoor temperature, outdoor temperature, and a variety of heating and/or cooling coefficients that are necessary to calculate optimal start and stop times.
Example
100 SSTOCO(1,1,ROOM10,OATEMP,75.0, 0.01,0.3,
0.05,0.083,72.0,0.1,0.1,0.2,0.083)