Orion System SA Controller - Manual (Page 50)

Zone
Zone
Sequence of Operations
SA Controller Technical Guide 50
Scheduling
The SA Controller has an internal power source for the Real Time Clock
(RTC) that allows the controller to keep the time and accurately control
scheduling. It can also broadcast the time to the VAV/Zone Controllers
if that option is confi gured.
The SA Controller has an internal 7-day Schedule with 2 Start/Stop
Events per day. You can also have 1 Holiday Schedule with 2 Start/
Stop Events per day. This Holiday Schedule can be used for 14 differ-
ent Holiday periods.
You can change the time on the SA Controller through the Modular
Service Tool, Modular System Manager, or the System Manager TS.
You can also broadcast the time and date to all SA Controllers by using
a Personal Computer and the Prism Computer Front-End Software.
The Internal Scheduling in the SA Controller also includes a Self-
Teaching Optimal Start Routine that can be activated by entering a value
of 1.0 or greater for the Soak Multiplier Setpoint. The Optimal Start
function can only be used if your SA Controller has a Space Temperature
Sensor installed and it is being used as the Controlling Sensor or if you
are using WattMaster VAV/Zone controllers with the SA Controller.
No adjustments other than the Soak Multiplier are required because the
SA Controller monitors how long it takes to reach the Target Temperature
each day and adjusts the Starting Time accordingly. That means the fi rst
day you operate your HVAC unit, it will not be able to Optimally Start
because it does not have a history of previous Starts and their results.
After the fi rst day, the SA Controller will begin adjusting the Start Time,
and after six Normally Scheduled Starts have occurred, the Optimal
Start Routine will have gathered enough data to provide an accurate
Pre-Start based on the learned conditions. This is an ongoing learning
process of the six previous starts, so the unit automatically adjusts for
the changing seasons. If you don’t need this feature, but you are using
the Space Temperature Sensor as the Controlling Sensor, you can set
the Soak Multiplier to zero to eliminate the Optimal Start Routines.
Internal Trend Logging
Internal Trend Logging
The SA Controller continuously maintains an Internal Trend Log, which
records a fi xed set of values at a user-programmed interval. These values
can be retrieved only with the Prism Computer Front-End Software. If
you do not have a computer with Prism Software installed and connected
to the system communications loop, you do not have access to these logs.
There are 120 log positions available. Once the last (120th) position
has been recorded, the log jumps back to the fi rst position and begins
overwriting the old data. This means the you will need to retrieve the
logs at an interval that is shorter than the duration of the last 120 logs
Shown below are some log intervals and the duration of 120 logs.
1 minute interval = 2 hours
12 minute interval = 24 hours
15 minute interval = 30 hours
30 minute interval = 60 hours
60 minute interval = 120 hours
The fi xed items in the log are listed below:
Date
Time
Space Temperature
Entering Water Temperature
Entering Air Temperature
Cooling Setpoint
Heating Setpoint
Supply Air Temperature
Supply Air Temperature Setpoint
Entering Humidity
Space Humidity
Water Side Economizer Position (Analog Output #1)
VFD Fan (Analog Output #2)
Modulating Heating (Analog Output #1)
Modulating Cooling Stage 1 (Analog Output #2)
Digital Compressor Stage 2 (Analog Output #3)
Modulating Reheat Position
Coil A Suction Pressure
Coil B Suction Pressure
Circuit A Head Pressure
Circuit B Head Pressure
Condenser Signal A
Condenser Signal B
WSE Bypass A
WSE Bypass B
On Board Relay Status (Bit Pattern)
Expansion Module Relay Status (Bit Pattern)
These items and values are explained in greater detail in the Prism
Computer Front-End Software Technical Guide.