Bosch SSB1000 SA Manual page 64

64 | Service reminder
Connector
J6
SENSOR INPUT
Connector
J7
GENERAL PUMP OUTPUT
Connector
J8
AL-BUS CONNECTOR
AL-BUS POWER SWITCH
Connector
J9
Connector
J11
Connector
J12
6720892984 (2019/02) US
Pin Pin Description
1 External display (AL-BUS Data)
2 External display (24V Power Supply)
3 Return sensor (NTC)
4 DHW sensor (NTC)
5 Flue gas sensor (NTC)
6 System sensor (NTC)
7 Outdoor sensor (NTC)
8 External display (AL-BUS GND)
NTC's have a resistance of 10k@25°C (77°F).
Temp. range NTC is -40°C to 150°C (-40°F to 300°F).
All these sensor inputs carry a voltage of 3V3 or 5V.
The sensors connected to the control should be free from the appliance earth.
The maximum cable length is 1 meter.
Pin Pin Description
1 N.C.
2 VSS for Flue/Condensate/Water pressure switch
3 Flue Pressure switch in series with Condensate Pressure Input
4 Water Pressure Switch (NC) (only for Leading)
5 General pump PWM control signal
6 Heat Exchanger Flow Sensor +5V
7 Heat Exchanger Flow Sensor VSS
8 Heat Exchanger Flow Sensor Pulse
9 Gas Pressure Switch (only for Leading)
10 VSS for General pump PWM control and Gas pressure switch
Maximal cable length is 1 meter.
Pin Pin Description
1 - 2 AL-BUS connector
Connector to connect other communication devices onto the AL-BUS communication bus or PC
communication.
The power ON this AL-BUS can be activated with S1 (the switch on the side):
Set to "OFF" position for a controller in a burner cascade or stand-alone appliance.
Set to "ON" position only on the controller of the first burner in the managing boiler of a boiler cascade
(see architecture diagram for system overview).
Pin Pin Description
1 0-10V Input
2 Open Thermostat interface or Room Thermostat ON/OFF
3 VSS
4 VSS
Pin Pin Description
1 Low Water Cut Off 1 (only for Leading)
2 VSS
3 Low Water Cut Off 2 (only for Leading)
4 VSS
Pin Pin Description
1 Safety Limit (ECO)
2 Supply Sensor (NTC)
3 Air Damper Feedback (only for Leading)
4 24V
5 VSS
6 VSS
SSB