LAARS S8Ext - Installation Manual - Manual (Page 28)

Page 28 LAARS Heating Systems
PUMP, VALVE, AND COMBUSTION AIR DAMPER OPERATION
• The S8 controls multiple relays each controlling different types of equipment. In addition to the control of the boilers or
cooling units, it can control, the primary system pump, unit pumps or valves, a DHW pump, and a combustion air damper. The
operation of those relays depends on the Startup and System Settings.
RUN-ON
Adjustable 0 to 60 minutes Default: 2 minutes
Button: MENU//Run-On
• The Run-On applies to all pumps, valves and dampers. It is the additional time a pump,
valve or a combustion air damper will run after the output unit relays has de-energized.
For pumps and valves it is used to dissipate the excess energy from the heating or
------- RUN-ON -------
2min
[ ]
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cooling system into the building. For a combustion air damper, it brings in enough fresh air for the next boiler fire up.
• The Run-On time should be set based on the size and type of the equipment. A boiler with low water content and high
horsepower will need a longer Run-On than a boiler with the same horsepower but has more water content.
PUMP EXERCISE
Adjustable Off, On Default: Off
Button: MENU//Pump Exercise
• The S8 provides an option to exercise pumps for 10 seconds when not used for seven
days. This option reduces pumps' impellers locking during the off-season period.
--- PUMP EXERCISE --
Off
On
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MAINTENANCE
Button: MENU/
The Maintenance menu gives access to sensor and outputs trimming. In addition, you'll have
access to view the Startup configuration settings as well as sensor histories
CAUTION
To be able to change the S8 settings the Program/Run Switch must be set to
Program. The switch is located under the Enclosure Wiring Cover for security.
The Enclosure Wiring Cover can be securely closed using a padlock.
---- MAINTENANCE ----
Unit F
Present Time 12:30P
BACK SELECT
SYSTEM & OUTDOOR SENSOR TRIM
Adjustable -20°F/-11°C to +20°F/+11°C Default: 0°F
Button: MENU//System Trim
Button: MENU//Outdoor Trim
Button: MENU//Return Trim
Button: MENU//DHW Trim
• The Laars thermistor type sensors are very accurate, and normally require no calibration.
However, sometimes it may be desirable to make small adjustments to the displayed
value.
• Do not use the Trim setting to make the Outdoor temperature sensor match the reported
on the radio or TV. Outdoor temperature can vary widely over a broadcast range.
--- SENSOR TRIM ----
System Trim +0 F
Outdoor Trim +0 F
Return Trim +0 F
DHW Trim +0 F
BACK SELECT
HISTORY
Button: MENU/
The S8 provides users with a graphical history of the System, Outdoor, DHW, and Return
temperatures for the previous 24 hours. The temperatures are sampled every 12 minutes. That
is, readings of temperatures are recorded and stored every 12 minutes for the last 24 hours.
Sys=120 F 10:00AM
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