Honeywell SDC Service Manual page 194

Hydraulic Components
194
maximum stage number for quick hot-water connection instead of
the general connection delay ("Cascading" menu, parameter 02).
For further stages, connection occurs based on the connection
delay that can be set.
For hot-water loading without heating (tank priority), the number
of heat generators is limited by the setting in the quick hot-water
connection parameter.
With parallel operation (heating circuit and hot-water demand
simultaneously), there is no stage number limitation.
With active hot-water loading, reversion of stages occurs under
consideration of the configured switch-off delay.
If heating circuit operation is active with more stages than were
enabled for hot-water circuit operation and hot-water loading then
occurs in priority mode, the stages above and beyond the number
of stages enabled for hot-water loading are switched off directly.
Reversion of the activated stages does not occur in parallel
operation.
The "stage sequence switch-over power" must be taken into
account for connection of the following stage.
Example:
• Cascaded system with five stages
• Parameter 02 = 1 min.
• Parameter 03 = 2 min.
• Parameter 09 = 3 min.
Heating
• Connection and disconnection with the configured delay of
parameters 02 and 03.
SDC / DHC
EN2H-0221GE51 R0812