LAARS S8Ext - Installation Manual - Manual (Page 6)

Page 6 LAARS Heating Systems
MAKE SURE YOU HAVE THE RIGHT CONTROL
If you need the S8 to do additional tasks that either are not listed or do not know how to configure them, contact LAARS.
INITIAL SETUP
Setting an Initial Program will ease the configuration of the S8 and will give the opportunity to utilize many of the energy saving features
and give more comfortable heat when needed.
The program should consist of the following:
• Selecting the features that your system can utilize
• Installation: Install the Control, switches and sensors
• Setting the System Startup
• Setting the System Settings
• Setting the Stages
• Adjusting Reset Ratio and Water Offset (In Reset Mode Only)
SELECTING THE SYSTEM FEATURES
The S8 has been designed with Hydronic heating and cooling as the primary purpose. With this in mind, many of the S8 features can be
utilized to ease, enhance and improve your system performance. Some of these features are listed in this section.
HEATING OR COOLING WITH MULTIPLE OR SINGLE OUTPUT AT A TIME
• The S8 is equipped to control multiple multi-stage boilers with or without pumps or valves for heating application. As well, it can
be configured for cooling with multiple stage chillers.
• That, combined with the capability of energizing only a single stage of a multi-stage cooling unit when in high demand, makes the
S8 versatile for many industries.
OUTDOOR RESET, SET POINT, OR EXTERNAL 4-20MA SET POINT
• The S8 can control the System Temperature either by adjusting the calculated temperature according to the Outdoor Temperature
(Outdoor Reset) or by maintaining an adjustable Set Point. The Outdoor Reset option uses an Outdoor Sensor (supplied with the
control) and achieves better fuel savings in addition to better comfort.
• Using an optional X-SIG Interface (CA004200), the S8 can receive an external 4-20mA Set Point through EMS system.
PID OR OSS CONTROL LOGIC
• The S8 PID can be used for applications where system reaction will require a long period to achieve or measure the results. However,
OSS, can be used for applications where the load changes frequently and the sequencing must match the load and its immediate
change.
NUMBER OF STAGES
• The S8 can be configured to control up to eight stages. It can control up to 24 stages using a maximum of two S8 Extension Panels
each with eight stages.
STAGE PUMPS OR VALVES
• The S8 can control muliple stages in addition to unit pumps, valves.
CONTROL DHW PUMP AND COMBUSTION AIR DAMPER
• The control of the DHW is based on either a temperature sensor, can be purchased separately, on the DHW source or using a dry
contact from an aquastat. The S8 provides multiple DHW Priority options to choose from based on the DHW piping. The Combustion
Air Damper output can control the equipment while utilizing the Prove input to check the status on the Combustion Air Damper End
Switch, System Pump Flow switch or any other checking devices before any stage is energized.
MONITOR BOILER RETURN
• The optional return line sensor, can be purchased separately, can be connected in heating applications to monitor and help protect
the boilers from thermal shock and condensation caused by cool returns.