Bosch SSB255 Installation And Service Manual page 52

52 | Applications
For this installation the wiring is shown in figure below:
CASCADE MOD Gas
LINK BUS Switch
1 2 3 4 5 6 7 8 9 10 11 12 13 14
(4)
Cascade link
Secondary boiler
CASCADE MOD Gas
LINK BUS Switch Door
1 2 3 4 5 6 7 8 9 10 11 12 13 14
(4)
Cascade link
Outdoor sensor
(3)
DHW tank sensor
or Aquastat
Room thermostat
Primary boiler
Fig. 81
6720818454 (2016/02) US
Out DHW Tank Room Supply
Door Sensor Thermostat Sensor
Relay (*)
Furnished and
Installed by others
Boiler pump
(9)
Out DHW Tank Room Supply
Sensor Thermostat Sensor
Relay (*)
Furnished
(2)
and
Installed
by others
(5)
Supply sensor
(1)
Boiler pump
Pump DHW
Boiler Pump CH
Pump
GND GND
N
L L
GND
N
L
3 Way
101 102 103 104 105 106 107 108 109
GND
L
N
Boiler Pump CH Pump DHW
Pump
GND GND
L N
L
GND
L N
3 Way
101 102 103 104 105 106 107 108 109
GND
L
GND
L N
Relay (*)
Furnished and
Installed by others
(8)
GND
L
N
CH pump
(7)
Alarm 120 V Aux
N
GND GND
N N
L L L
110 111 112 113 114 115 116
120 V Line
Ground
120 V Neutral
120 V Main in
Alarm 120 V Aux
N
GND GND
L N L N
L
110 111 112 113 114 115
116
Relay (*)
Furnished and
Installed by others
N
DHW tank pump
(6)
120 V Line
Ground
120 V Neutral
120 V Main in
GND
N
117 118
GND
N
117 118
SSB