LAARS Heating Systems
Page 72
C O N F I G U R AT I O N
8.D.4.a Cascade CH
To navigate to the Cascade CH Configuration Screen, touch the Cascade Icon on the Configuration Screen, then
touch 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 the
local boiler/heater address. Each boiler/heater must have a unique address. A boiler/heater with a value of 0 is the
lead boiler/heater. Lag boilers/heaters use values 1 through 7. When automatically addressing each boiler/heater, set
the lead boiler/heater to a value of 0. With a value of 0, the Cascade Auto-Config button is available to use, refer to
this 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 automatically
addressed. After a boiler/heater has been manually/automatically addressed, setting this parameter to -1 will remove
the boiler/heater from cascade operations.
• Lead Settings
– This button is only selectable when configured as the lead boiler/heater. When configured as the lead
boiler/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 parameter
is 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/heater
will turn on to satisfy an active cascade demand based on the local boiler/heater outlet water temperature. Max Lag
Temp 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 water
temperature. 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 the
cascade 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 on
page 75
NOTE
: All boilers/heaters must be wired for cascade operations
prior to performing Cascade Auto-Config.
