Page 45HTD3 4Gas ValvePilotGas ValvesMainSpark1728Generator12-PIN CONNECTOR "B"BRX1-14X1-2X1-1X1-3X1-13X1-153410LWCO LWCO ProbeWVoltageSupplyLWCOX4-14X4-4X4-1X4-11X4-16X4-6X4-15X4-5X4-9X4-19X4-18X4-8X3-14X4-3X4-13X4-12X4-2X4-17X4-7TB1-3:2 GNDTB1-7:2 120NTB1-11:2 120L9X3-68-PIN CONNECTOR "C"W/R748W/G6351W/BKVW/RFLUE-A (10K)-t°-t°-t°-t°FLUE-B (20K)INLET (10K)OUTLET-AOUTLET-B10K20K-t°16-PIN CONNECTOR "A"8146BL/WBLW/RGY/VBK/OGY/RRGY/BK102124311513RLEVELCONDENSATECUTOUTFLOWPRESSURETHERMALPRESSURELOW GASHIGH GAS1BR/YBK/WBR/RBK/OBR/RLWCORESETHIGH LIMITHIGH LIMITMANUALAUTO RESET BR/Y92TB1-6:2 GNDW/VV/WW/BKGGY/RGY/BKW WBKGWWW/GW/G SparkIgnitorO2 CONTROLLERO2-1O2-2O2-312VDC POWER SUPPLYL N G V+V-O2 SensorTB1-12:1TB1-9:3TB1-6:3BK/OWGRBKTB1-7:1 120NTB1-8:1 120NTB1-8:2 120NACTUATORFUEL ACTUATORAIRX22-3R/BKX22-11X22-4X22-10435X22-12BN/GPRESSURE13TRANSMITTER - 1X22-1X22-2W/BNBR/RW/RW/GBLOWER (PWM)Units Only1.6MMPG TB1-4:2 GNDBKR/BK157122PRESSURE13TRANSMITTER - 2W/RBK221O2-4321RRX22-8X22-7 R12345RW/GGN/R3 4Gas ValvePilotGas ValvesMainSpark1728Generator12-PIN CONNECTOR "B"X6-1BRX1-14X1-2X1-1X1-3X1-13X1-15X7-1X7-2X7-3X6-2X6-33410LWCO LWCO ProbeWVoltageSupplyLWCOX4-14X4-4X4-1X4-11X4-16X4-6X4-15X4-5X4-9X4-19X4-18X4-8X3-14X4-3X4-13X4-12X4-2X4-17X4-7TB1-3:2 GNDTB1-7:2 120NTB1-11:2 120L9X3-6BR/R2B58-PIN CONNECTOR "C"W/RY/GW/GBR/GY/R748W/G6351W/BKVW/RAABRS485BMSRS485FLUE-A (10K)-t°-t°-t°-t°FLUE-B (20K)INLET (10K)OUTLET-AOUTLET-B10K20K-t°GNDGNDCASCADE W/R Units Only2.0 - 4.016-PIN CONNECTOR "A"8146BL/WBLW/RGY/VBK/OGY/RRGY/BK102124311513RLEVELCONDENSATECUTOUTFLOWPRESSURETHERMALPRESSURELOW GASHIGH GAS1BR/YBK/WBR/RBK/OBR/RLWCORESETHIGH LIMITHIGH LIMITMANUALAUTO RESET BR/Y92TB1-6:2 GNDW/VV/WW/BKGGY/RGY/BKW WBKGWWW/GW/G SparkIgnitorO2 CONTROLLERO2-1O2-2O2-312VDC POWER SUPPLYL N G V+V-O2 SensorTB1-12:1TB1-9:3TB1-6:3BK/OWGRBK12345TB1-7:1 120NTB1-8:1 120NTB1-8:2 120NX641X53 - AIR23451X54 - FUEL2345ACTUATORFUEL ACTUATORAIRTACHOMETER61596062X22-3R/BKX22-11X22-4X22-10435X22-12BN/GPRESSURE13TRANSMITTER - 1X22-1X22-2W/BNBR/RW/RW/G6364BLOWER (PWM)Units Only1.6MMPG TB1-4:2 GNDBKGW/RR/BK157122PRESSURE13TRANSMITTER - 2W/RBK221O2-4321RRX22-8X22-7 R12345RW/GGN/RWiring Diagram is located on the inside front panel.