Orion System SA Controller - Manual (Page 31)

SA Controller Operator Interface
Programming
31
Setpoint Screen #20 - Supply Fan Starting
Delay Timer
SA Unit Spts ID 102
Fan Starting Delay
Timer...: 255 s
This is the Supply Fan Starting Delay Timer initiated whenever the SA
Controller initiates Supply Fan operation. This is useful when you are
using multiple SA-controlled HVAC units and want to be sure that all the
units do not start at exactly the same time when the Occupied schedule
occurs. Each SA Controller should be set with staggered Fan Starting
Delay Timer Setpoint values. When the 255 Second default setpoint is
used, it multiplies each SA Controller’s address by 5 and uses this value
in seconds as the Fan Starting Delay Time. This provides a staggered
start for each SA Controller on the system without having to individually
set each SA Controller for its own time delay.
Description Minimum Default Maximum
Fan Start Delay Timer 0 Sec 255 Sec 255 Sec
Setpoint Screen #21 - Mechanical Heat/Cool
Failure Time Period
SA Unit Spts ID 102
Mechanical Heat/Cool
Failures Occur After
No Change For 15 Min
When Heating or Cooling Mode is initiated and staging is activated,
if the Supply Air Temperature does not rise or fall 5°F within the
Mechanical Heat/Cool Failures Occur After No Change For Setpoint
time period, a Mechanical Heating or Cooling failure alarm will be
generated. The Alarm is for Status Reporting only. The HVAC unit will
continue to run.
Description Minimum Default Maximum
Mechanical Heat/Cool
Failures Occur After
No Change For
0 Min 15 Min 255 Min
SA Controller Setpoint Screens
Setpoint Screen #22 - Preheat/ Low Ambient
Temperature
SA Unit Spts ID 102
Preheat/Low
Ambient Temperature
Setpoint: 0ºF
For cold climates where freezing temperatures may be experienced,
a Pre-Heater relay output can be activated based on the Outdoor Air
Temperature to prevent freezing of Water Coils. One of the SA Relay
Outputs must be confi gured for the Pre-Heater control. When confi gured,
if the Entering Air Temperature falls below the Low EAT Ambient Pro-
tection Temperature Setpoint and the HVAC unit is in Occupied Mode,
the Pre-Heater relay will activate.
Description Minimum Default Maximum
Preheat/Low Ambient
Temperature
0ºF 0ºF 100ºF
Setpoint Screen #23 - HVAC Schedule
SA Unit Spts ID 102
HVAC Schedule...: 0
[ 0 = Internal ]
[1-5 = External ]
The SA Controller has an Internal Scheduler. If you want the SA Control-
ler to use its own Internal Schedule to schedule the HVAC unit, enter
<0> for Internal. To use the External Schedule option, you must have a
GPC Plus controller installed and operating on your system. To use one
of the (5) External Schedules available on the GPC Plus controller, enter
the number of the GPC Plus Schedule (1 through 5) you wish to use.
Description Minimum Default Maximum
HVAC Schedule 0 0 5