User Guide

Command Syntax
Siemens Building Technologies, Inc. 3-101
when errors between actual temperatures and desired temperatures
occur.
Example
60 SSTO(1,1,ONTIM,OFTIM,6:30,7:45,8:00,15:30,
16:45,17:00,0.0,0.0)
Notes
• The SSTO command only calculates the optimal start and stop
times. TOD and TODSET commands are needed to command
the point.
• When ast or asp is defined as zero, the current adjustment value
is displayed each time the command is displayed. If a virtual LAO
point name is entered, the operator can specify (command) an
initial value for ast or asp.
See also
SSTOCO, TOD, TODSET
APOGEE PPCL User’s Manual
3-102 Siemens Building Technologies, Inc.
SSTOCO (SSTO coefficients)
Unitary pre-APOGEE APOGEE BACnet
  
Syntax
SSTOCO(zone,season,intemp,outemp,ctemp,ccoef1,ccoef2,
ccoef3,ccoef4,htemp,hcoef1,hcoef2,hcoef3,hcoef4)
NOTE: For variables used in this 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.
ctemp 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.