Bosch SSB1000 TL - Page 16

6720892984 (2019/02) US SSB
16 | BURNERS cascade
3.3.5.2 Power mode 2 – Maximum burners on (Rev. 4.0.905.15906)
Power mode 2 is designed to have as many depending burners on
as possible. When the average burner power of the active depending
burners is above a set minimum power, another burner is started.
Burner startup
The next burner is started under the following conditions:
• When the average burner power of all depending burners is over the
set minimum burner power + hysteresis.
− Sum of burner power of all depending [%] >
minimum_
power
[%] * (depending in burn + 1) + minimum_
power_hysteresis
.
Burner shut down
The last started burner will be stopped under the following conditions:
• When the average burner power of all depending burners is under the
set minimum burner power.
− Sum of burner power of all depending [%] <
minimum_
power
[%] * depending in burn.
Relevant variables
Specic Parameters Level
(Default)
Value
Range
Power_Mode 2: Installer 3 0..3
Minimum_Power
[%]
Minimum average burner power
setting
2: Installer 20 1..100
Minimum_Power_
Hysteresis
[%]
Hysteresis for the minimum average
burner power setting
2: Installer 40 1..100
3.3.5.3 Power mode 3 – Balanced burners on (Rev. 4.0.905.15906)
Power mode 3 is designed to have a balanced water ow in systems with
a header/manifold.
Burner startup
The next burner is started under the following conditions:
• When the average burner power of all depending burners is over the
set start rate for the next burner.
− Sum of burner power of all depending [%] >
Start_Rate_
Next_Burner
[%] * depending in burn.
Burner shut down
The last started burner will be stopped under the following conditions:
• When the average burner power of all depending burners is under the
set stop rate for the next burner.
− Sum of burner power of all depending [%] <
Stop_Rate_
Next_Burner
[%] * depending in burn.
Relevant variables
Specic Parameters Level
(Default)
Value
Range
°C °F °C °F
Power_Mode 2: Installer 3 0..3
Start_Rate_Next_Burner
[%]
Threshold rate before start the
next Burner. Condition: at least 1
depending in burn state power [%] >
Start_Rate_Next_Burner [%]
2: Installer 80 1..100
Stop_Rate_Last_Burner
[%]
Threshold rate before start the next
Burner. Condition: all depending in
burn state Power [%] < Stop_Rate_
Next_Burner [%]
2: Installer 25 1..100
Delay_ Period_Start_Next_
Burner
[min]
When the timeout is over the last
dependent can be started
2: Installer 3 1..15
Delay_ Period_Stop_Last_
Burner
[min]
When the timeout is over the last
Burner can be stopped
2: Installer 3 1..15
Hyst_Up_Stop_Burner
Hysterese to stop Burner. Condition:
T_System above Header_Setpoint
plus Hyst_Up_Stop_ Burner
2: Installer 5 9 0..20 0..36
Hyst_ Down_Start_Burner
[sec]
Hysterese to stop Burner. Condition:
T_System below Header_Setpoint
plus Hyst_Up_Stop_Burner
2: Installer 5 9 0..20 0..36