Page 39HTD0 S16 Read Inlet Sensor AI 0 Read1 S16 Read Outlet Sensor AI 1 Read2 S16 Read Flue Sensor AI 2 Read3 S16 Read DHW Sensor AI 3 Read4 S16 Read System Inlet Sensor AI 4 Read5 S16 Read System Outlet Sensor AI 5 Read6 S16 Read Outdoor Sensor AI 6 Read12 S16 Read Flame Signal 1 AI 12 Read14 S16 Read 0-10VDC (4-20mA) Input for BMS AI 14 Read17 S16 Read 0-10VDC (4-20mA) Input for Blower Speed AI 17 Readbit0 = Flow Switchbit1 = LWCObit2 = MRHLbit3 = Blocked Fluebit4 = High Gas Pressurebit5 = Low Gas Pressurebit6 = Field Interlockbit7 = ARHLbit0 = Field Input 1bit1 = Field Input 20=None1=Anti-Short Cycle2=Service3=DHW4=Cascade5=External6=CH17=CH210=Anti-Frost11=Warm weather shutdownbit0 = Run contactbit1 = Alarm Contactbit2 = DHW Pumpbit3 = System Pumpbit4 = Louver contactbit5 = Aux dry contact 1bit6 = Aux dry contact 2bit7 = Boiler pumpbit8 = Aux powered contactbit 0 = Burner 1 Pilot Gas valvebit 1 = Burner 1 Gas valve 123 S16 Read 0-10VDC (4-20mA) Output for Pump Speed AI 23 Read24 S16 Read 0-10VDC (4-20mA) Output for Fan Speed AI 24 Read27 S16 Read Modulating Fan 1 - Speed AI 27 Read33 S16 Read Modulating Burner1 Firing rate AI 33 ReadFLOW SWITCH = 0LOW WATER CUT OFF ERROR = 1MANUAL RESET HIGH LIMIT = 2PRESSURE SWITCH = 3HIGH GAS PRESSURE SWITCH = 4LOW GAS PRESSURE SWITCH = 5FIELD INTERLOCK = 6SPARE SAFETY CHAIN = 7OUTLET PROBE LOCKOUT = 8OUTLET PROBE DRIFT = 9OUTLET PROBE HIGH LIMIT = 10FLUE PROBE LOCKOUT = 11FLUE PROBE DRIFT = 13FLUE PROBE HIGH LIMIT = 14INLET PROBE LOCKOUT = 15DELTA-T = 16GENERIC LOCKOUT = 17BURNER APS LOCKOUT = 18BURNER PARASITIC FLAME = 20BURNER MAX IGNITION ATTEMPTS = 22BURNER MAX FLAME LOSS = 24NO LOCKOUT = 25524 VDC ERROR = 3024 VAC ERROR = 31DHW PROBE ERROR = 32SYSTEM SUPPLY PROBE ERROR = 33SYSTEM RETURN PROBE ERROR = 34OUTDOOR PROBE ERROR = 35HIGH LIMIT AUTO ERROR = 41HIGH DELTA-T ERROR = 42FAN SPEED ERROR = 4338 U16 Read History - DHW Demand Cycles AI 38 Read39 U16 Read History - CH1 Demand Cycles AI 39 Read40 U16 Read History - CH2 Demand Cycles AI 40 Read43 U16 Read History - Cascade Demand Cycles AI 43 Read44 U16 Read History - Burner Stage 1 Cycles AI 44 Read48 U16 Read History - Boiler Pump Cycles AI 48 ReadNotesMap Descriptor NameBACnetData TypeBACnetObject ID Read/WriteReadAI 19 ReadAI 18 ReadReadDigital Output Status AI 21 ReadReadError Code AI 36 ReadSafety Chain StatusNon-safety Chain StatusDemand SourceGas and Pilot Valve Status AI 22AI 20ModbusAddress Type R/W18 S16 Read19 S16 Read20 S16 ReadReadS1621ReadS162236 S16 Read35 S16 Read Lockout code AI 357.E Modbus to BACnet Memory Map