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17.4.1
N
EXT MODULE TO START SELECTION
When the cascade Module_Rotation_Interval has passed the control will perform the cascade rotation. At this
moment the next available control based on the current First_Module_To_Start is selected.
A depending control is available when the control is present on the communication bus and the control is not
blocked by an error.
When the control is not available the control is skipped as the next First_Module_To_Start.
Relevant variables
Specific Parameters
Module Rotation Interval
First Module To Start
Cascade Error handling
17.5.1
C
ASCADE
Frost protection on a cascade is active on two levels
1. Frost protection for module cascade
The 'frost protection' function for a module cascade is related to the system sensor temperature. When the sen-
sor value is below:
Spec. Parameter
Parameter nr.
Frost Protection
Module cas-
cade settings:
155
Frost Protection
plus 9°F (5°C)
Frost Protection
minus 9°F (5°C)
2. Frost protection on water heater
As last protection the controllers for the heaters can force themselves to burn.
If the water heater supply/Inlet temperature drops below 5 °C the water heater starts at minimum power and
continues burning until the lowest of both supply and Inlet temperatures are above 15 °C.
Specific Parameters
Frost protection
E
17.5.2
MERGENCY MODE
Managing water heater error
When the managing water heater is in error mode, the depending heaters can go into the "Emergency_Mode", if
enabled. In emergency mode the system setpoint is set to the temperature of the Emergency_Setpoint and all
cascaded heaters start burning using this setpoint.
NOTE: the default setting is 50°C (122°F) ! Make sure the right temperature is set.
Specific Parameters
Permit Emergency Mode
Emergency Setpoint
Dair active
106
Par. nr.
Module Cascade Pa-
rameter 84
Module Cascade Pa-
rameter 149
F
ROST PROTECTION
The Cascade pump (system
pump) is started
Cascade heat demand is acti-
vated; the general pumps of all
the cascaded water heaters will
be started.
Parameter nr.
Boiler settings
Parameter 205
Parameter
Level
Module Cascade pa-
2: Installer
rameter 72
Module Cascade pa-
2: Installer
rameter 74
Boiler parameter
2: Installer
139
Level
(Default) Value
2: Installer
2: Installer
Default value
15 °C
15 plus 5 = 20 °C
15 minus 5 = 10
°C
Level
(Default) Value
2: Installer
Enable
(Default) Value
Yes
50 ºC (122 ºF)
Yes
E93.1804.014
Range
5
0...30
(0: Disabled)
1
1...8/16
Range
10 - 30°C
Range
Enable /
Disable
Range
Yes/No
20 - 90 °C (68 - 194 °F)
Yes/No
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