Laars MagnaTherm HTD Series Installation And Operation Instructions Manual

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Laars MagnaTherm HTD Series Installation And Operation Instructions Manual Manual pdf 76 page image

LAARS Heating SystemsPage 72 C O N F I G U R AT I O N8.D.4.a Cascade CHTo navigate to the Cascade CH Configuration Screen, touch the Cascade Icon on the Configuration Screen, thentouch the Cascade CH Icon on the Cascade Configuration Screen.The Cascade CH Configuration Screen allows adjustment of the following parameters:• Address – When manually addressing each boiler/heater for cascade operations, this parameter is used to set thelocal boiler/heater address. Each boiler/heater must have a unique address. A boiler/heater with a value of 0 is thelead boiler/heater. Lag boilers/heaters use values 1 through 7. When automatically addressing each boiler/heater, setthe lead boiler/heater to a value of 0. With a value of 0, the Cascade Auto-Config button is available to use, refer tothis parameter below for instructions for automatic addressing the lag boilers/heaters.• Dynamic Address – This reflects the address of the local boiler/heater after it has been manually or automaticallyaddressed. After a boiler/heater has been manually/automatically addressed, setting this parameter to -1 will removethe boiler/heater from cascade operations.• Lead Settings – This button is only selectable when configured as the lead boiler/heater. When configured as the leadboiler/heater, touching this button navigates to the Lead boiler/heater settings. See Section 8.D.4.a.1 on page 73• Lost Lead Backup Setpoint – When configured for Cascade Redundancy - Boiler Internal Set Point, this parameteris the maximum outlet temperature the local boiler/heater is allowed to supply the system.• Lag On Hysteresis - The value below the Max Lag Temp (Max Lag Temp – Lag On Hysteresis) that the boiler/heaterwill turn on to satisfy an active cascade demand based on the local boiler/heater outlet water temperature. Max LagTemp is set at the Lead boiler/heater.• LagOffHysteresis- The value above the Max Lag Temp (Max Lag Temp + Lag Off Hysteresis) that the boiler/heater will turn off when satisfying an active cascade heat demand based on the local boiler/heater outlet watertemperature. Max Lag Temp is set at the Lead boiler/heater.• CascadeAuto-Config – This is only adjustable at the lead boiler/heater. Once configured as the lead boiler/heater,pressing this button will initiate the lead boiler/heater to find and address all lag boilers automatically.• Cascade Release Demand - When communications with the master is lost and the lag units continue to satisfy thecascade heat demand, pressing this button will remove the heat demand.NOTE: This only applies when configured for cascade - Boiler Internal Set Point Control. See Section 8.D.4.d onpage 75NOTE: All boilers/heaters must be wired for cascade operationsprior to performing Cascade Auto-Config.