Appendix B - Connection Diagram - Bosch SSB800 SA Installation And Service Instructions For Contractors

42 | CONNECTION DIAGRAM

Appendix B - Connection diagram

CONNECTION DIAGRAM 905MN CONTROL BOARD
0-10V input
Open Thermostat interface or
Room Thermostat ON/OFF
REMOTE
DISPLAY
PROG. INPUT 5:
1) T_Return
DHW_STAT
T_DHW_OUT/T_Store
PROG. INPUT 6:
1) T_Flue_1 (sensor)
( ue gas sensor/switch)
PROG. INPUT 7:
3) T_System
T_Outdoor
PROG. INPUT 1:
3) Flue Pressure switch
PROG. INPUT 2:
3) Heat Exchange_Flow sensor
PROG. INPUT 3:
3) Min/Max Gas Pressure switch
PROG. INPUT 8:
2) Water Pressure switch (NC)
in series with Air Pressure switch
General Pump Control
Safety Limit (ECO)
24VDC
T_Supply_1
Low Water Cut O 1
(Safe)
Low Water Cut O 2
(Not functional)
AL-BUS/PC Connection
AL-BUS Power
6720866942 (2018/06) US
Sensor
Int. ionization
HALL
HALL Supply
DIPSWITCH
Ignition
Burner
Spark Return
MAINS SUPPLY
PROG. OUTPUT 4
CONFIG. 1
3) DHW Pump
PROG. OUTPUT 1
2) CH Pump
PROG. OUTPUT 3
9) Ext. Igniter
PROG. OUTPUT 5
1) General Pump
PROG. OUTPUT 2
6) Alarm Relay
FAN
PWM interface
GAS VALVE
SSB