Boiler Cascade Settings - Bosch Buderus SSB Control Operations Manual

8 | Bosch Buderus SSB800SA | SSB1000SA | SSB1000TL Boilers

4 Boiler Cascade Settings

Number Parameter Name
73 Boiler Address
156 Permit Emergency Mode
157 Emergency Setpoint
158 Delay Per Start Next Blr
159 Delay Per Stop Next Blr
160 Delay Quick Start Next
161 Delay Quick Stop Next
162 Hyst Down Start Boiler
163 Hyst Up Stop Boiler
164 Hyst Down Quick Start
165 Hyst Up Quick Stop
166 Hyst Up Stop All
167 Number Of Boilers
168 Power Mode
169 Max Setp Offset Down
170 Max Setp Offset Up
171 Start Mod Delay Fact
172 Next Boiler Start Rate
173 Next Boiler Stop Rate
174 Boiler Rotation Interval
175 First Boiler To Start
180 Pwr Mode 2 Min Power
181 Pwr Mode 2 Hysteresis
182 Post-Pump Period
Table 3
Data subject to change
Set boiler address i.e. Stand-Alone, Managing, Dependent 1....7
Enable Emergency Mode in a multiple boiler cascade installation to ensure that any dependent boiler can operate
independently should communication with the managing boiler be interrupted or the managing boiler loses
communication with the supply sensor. The boiler will operate at a predetermined Emergency Setpoint which is
set using Parameter #157.
Emergency Setpoint is the fi xed set point which a boiler will operate at within a cascade installation if that boiler
has lost communication with the Managing boiler or the Managing boiler loses communication with the supply
sensor. Parameter #156 must be "Yes" on each dependent boiler and Emergency Setpoint set for the desired
Emergency Temperature at which the boiler is to operate.
See Hyst Down Start Boiler .
See Hyst Up Stop Boiler .
See Hyst Down Quick Start .
See Hyst Up Quick Stop .
If the system temperature is Hyst Down Start Boiler degrees below the system set point the boilers are started at
intervals of Delay Per Start Next Blr .
If the system temperature is Hyst Up Stop Boiler degrees above the system set poin tthe boilers are stopped at
intervals of Delay Per Start Next Blr .
If the system temperature is Hyst Down Quick Start degrees below the system set point the boilers are started at
intervals of Delay Quick Start Next .
If the system temperature Hysteresis Up Quick Stop degrees is above the system set point the boilers are stopped
at intervals of Delay Quick Stop Next .
If the system temperature is Hyst Up Quick Stop degrees above the system set point the boilers are stopped at
intervals of Delay Quick Stop Next .
The amount of boilers in the cascade.
Power mode 0: Power control disabled, each boiler modulates based on the system setpoint.
Power mode 1: Power control algorithm to have a minimum amount of boilers active.
Power mode 2: Power control algorithm to have a maximum amount of boilers active.
Power mode 3: Power control algorithm to have a balanced amount of boilers active.
In order to achieve the desired Target System Supply Temperature during a call for heat the boilers may need to
operate at temperatures greater than or less than the desired Target System Supply Temperature. The operating
range in which the boilers are allowed to adjust the individual boiler supply temperatures is defi ned by the Max Setp
Offset Down and Max Setp Offset Up (parameter #170) values. Each dependent boiler will display a "Calculated
Setpoint" temperature on the display which will be within this Off set Range either above or below the overall Target
System Supply Temperature.
See Parameter #169 for explanation of Max Setp Offset Down and Max Setp Offset Up .
The Managing boiler will calculate the difference between the System Target Setpoint and the measured System
Supply Temperature once a period of time equal to Delay Period Start Next Boiler x Start Modulation Delay
Factor has passed.
The percentage of power a boiler must reach before the Managing boiler will begin the process of bringing on the
next boiler within the cascade. See Parameter#158 for further information on the amount of time which must pass
at this power percentage before the next boiler in the cascade rotation is enabled.
The percentage of power a boiler must reach before the Managing boiler will begin the process of turning off the last
boiler enabled within the cascade rotation sequence. See Parameter #159 for further information on the amount of
time which must pass at this power percentage before a boiler is turned off.
Number of days selectable.
First boiler in cascade that will start.
Minimum average burner power setting.
Hysteresis for the minimum average boiler power setting.
Factory setting - Do Not Change
Description
Control Operations Guide
Default Min Max
MANAGING 0 16
YES NO YES
158 °F 68 °F 194 °F
1275 sec. 0 sec. 1275 sec.
1275 sec. 0 sec. 1275 sec.
400 sec. 0 sec. 1275 sec.
240 sec. 0 sec. 1275 sec.
9 °F 0 °F 72 °F
3.6 °F 0 °F 72 °F
18 °F 0 °F 72 °F
7.2 °F 0 °F 72 °F
14.4 °F 0 °F 108 °F
1 1 8
2 0 3
0 °F 0 °F 72 °F
36 °F 0 °F 72 °F
20 0 255
80% 10% 100%
25% 10% 100%
5 DAYS 0 DAYS 30 DAYS
1 1 8
20% 0% 100%
40% 0% 100%
N/A N/A N/A
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