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