LAARS S8Ext - Installation Manual User Manual
Page 19
Page 19
LAARS Sequencing Controls S8 & S8EXT
• The Oversize option sequence stages based on how many Throttling ranges (differentials) is the system temperature away
from the Target Temperature. In Heating and at one Throttling range below the Set Point, only one stage will be on. For
each additional Throttling range below the Set Point, an additional stage will be activated. The last stage on will be allowed
to exceed the Set Point by one Throttling range before turning off that stage. This helps to prevent the last stage from short
cycling.
When PID is Selected, the following are the settings that directly affects this modes operation:
• Reaction Time
SELECT Settings/System Settings/Stage Settings/Reaction Time
• Purge Delay
SELECT Settings/System Settings/Stage Settings/Purge Delay
• Minimum Run Time
SELECT Settings/System Settings/Stage Settings/Min Runtime
• Standby Delay
SELECT Settings/System Settings/Stage Settings/Standby Delay
• Last Stage Hold
SELECT Settings/System Settings/Stage Settings/Last Stage Hold
When Oversize (OSS) is Selected, the following are the settings that directly affects this modes operation:
• Throttle
SELECT Settings/System Settings/Stage Settings/Throttle
SENSOR FAULT
Stages On, Stages Off
Default: Stages On
Button: MENU/
The Sensor Fault will determine the operating status of all output stages that are set to Auto
when a sensor reads Short or Open.
--- SENSOR FAULT ---
Stages On
Stages Off
BACK SAVE
RESET MODE
• When Stages-On is selected, the S8 will turn all unit stages On when the System reads Short or Open and Outdoor is below
Outdoor Cutoff in heating or above Outdoor Cutoff in Cooling. When Outdoor reads Short or Open, the S8 will change the
Target to me the Maximum Target.
• When Stages-Off is selected, the S8 will turn all stages Off when the System reads Short or Open. However, when the Outdoor
reads Short or Open, the S8 will change the Target to me the Minimum Target.
SET POINT MODE
• When Stages-On is selected, the S8 will turn all stages On when the System sensor reads Short or Open.
• When Stages-Off is selected, the S8 will turn all stages Off when the System sensor reads Short or Open.
• The Outdoor Sensor Short or Open status will not affect the control operation in Set Point mode.