Boilers' Cascade Installation And Start-Up (For Ssb 1000 Tl Only); Boilers Cascade: Set Boiler Address; Boilers Cascade: Set Power Switch S1 - Bosch SSB800 SA Installation And Service Instructions For Contractors

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:
RS485
RS232
RS485
RS232
BMS bus
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
Managing
Dependent 1
6720866942 (2018/06) US
Touch Screen 900PB
Power Supply
900PB
Touch Screen
Power Supply
(73) Boiler Address
Managing
Dep. 1
Demand: 0-10V / OpenTherm / On-Off
T outside
Boiler sensor
90xMN - D1
J6
Boiler manager &
Cascade manager
90xMN - D2
J8
Boiler sensor
90xMN - D1
J6
Boiler manager &
Cascade manager
90xMN - D2
J8
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.
Fig. 50 Set Power switch S1
System sensor D2 is
Cascade system sensor
J8 Iso + Power
S1 = on
S1 = off MANAGING
BOILER
J8 Iso
S1 = off
DEPENDENT
BOILER
S1 = off
MAX 4 BOILERS
S1
J8
J11
905MN
SSB