Bosch SSB1000 TL - Safety and System Functions; Flame Detection and Measurement; Overheat Detection Safety Limit

6720866942 (2018/06) US SSB
34 | Commissioning
5.6 Boilers’ cascade installation and start-up (FOR SSB 1000 TL ONLY)
Appendix E shows an example of SSB 1000 TL boilers installed in a cascade of three units. The built-in control system is capable to manage up to 4
boilers as a single, coordinated heating system. The logical scheme is:
MAX 4 BOILERS
Demand: 0-10V / OpenTherm / On-Off
T outside
System sensor D2 is
Cascade system sensor
Boiler sensor
J6 J8 Iso + Power
S1 = on
J8
S1 = off MANAGING
BOILER
Boiler sensor
J6 J8 Iso
S1 = off
J8 DEPENDENT
BMS bus
S1 = off BOILER
90xMN - D1
Boiler manager &
Cascade manager
90xMN - D2
900PBTouch Screen
Power Supply
900PB
RS485
RS232
Power Supply
Touch Screen
RS485
RS232
90xMN - D1
Boiler manager &
Cascade manager
90xMN - D2
Fig. 49 Cascade installation scheme
After the electrical wiring of the Managing controllers of each boiler of the cascade (through the “Cascade link” connections on the Low voltage terminal
strips), the following steps must be done:
5.6.1 Boilers Cascade: Set Boiler Address
Assign the Boiler Address in the Managing boards of each boiler of the
cascade, following the path below on the Sevice display:
Menu->Setting->Boiler Settings->Boiler Cascade
Settings->(73) Boiler Address
BOILER (73) Boiler Address
Managing Managing
Dependent 1 Dep. 1
5.6.2 Boilers Cascade: Set Power switch S1
On the Managing controller of the Cascade Managing boiler, the Power
Switch S1 must be in ON position (see picture below).
The S1 switch must be in OFF position on all other controllers of the
boilers in the cascade.
J8
J11
905MN
S1
Dip Switch
12345678
Fig. 50 Set Power switch S1