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COLOR CODING V : Violet W : White O : Orange R : Red BK : Black BL : Blue GY : Gray G : Green BR : Brown Y : Yellow WIRING DIAGRAM HOT NEUTRAL 10A(FUSE) RELAY 1 CIRCULATION PUMP RELAY 2 FREEZE PREVENTION HEATER ARRESTER VARISTOR VARISTOR DC140V DC140V POWER CONTROLLER FAN CONTROL OUTPUT E FAN COMBUTION FAN DC12V FAN ROTATION SPEED INPUT EARTH C SECONDARY A B FAN CURRENT VALUE INPUT 15V POWER CIRCUIT RELAY 1 RELAY DRIVING CIRCUIT RELAY 2 Sub-CPU SUB CONTROL UNIT CPU DU GND CENTRAL PROCESSING UNIT GAS PROPORTION VALVE POWER CONTROL CIRCUIT IG DRIVING CIRCUIT FR FLAME ROD WATER LEVEL ELECTRODE DETECTION CIRCUIT D WATER OUTLET THERMISTOR WATER INLET THERMISTOR FLAME DETECTING CIRCUIT IGNITER E BYPASS FLOW CONTROL VALVE <E(N,P)19 Model Only> SOLENOID SV0 VALVE 0 SOLENOID SV1 VALVE Q1 B C HEAT EXCHANGER FLOW CONTROL VALVE DC15V HIGH LIMIT SWITCH A WATER FLOW SENSOR PRIMARY IG FAN PULSE CONTROL CIRCUIT EARTH HEAT EXCHANGER THERMISTOR D AIR INLET THERMISTOR GAS SOLENOID VALVE DRIVING CIRCUIT EXHAUST THERMISTOR SOLENOID SV2 VALVE Q2 SOLENOID SV3 VALVE Q3 <E(N,P)19 Model Only> SOLENOID SV4 VALVE Q4 5V POWER CIRCUIT GND THERMAL FUSE HEAT EXCHANGER FLOW CONTROL VALVE (VDC) (VCC) (Fully open) (GND) BK V W G O R Y BL BK V W G O R Y BL WR <E(N,P)19 Model Only> (VDC) BYPASS FLOW CONTROL VALVE (VCC) (Fully open) (GND) BK V W G O R Y BL CIRCULATION PUMP (OPTIONAL) BK V W G O R Y BL R W W <CN186> <CN42> HEAT EXCHANGER THERMISTOR W BK W BK WATER OUTLET THERMISTOR AIR INLET THERMISTOR WATER INLET THERMISTOR EXHAUST THERMISTOR MAIN CIRCUIT BOARD W W O R BL G W Y <CN78> R V O W BK G BK BL V G O W <E(N,P)18 Model Only> <CN197> Manifold Gas Pressure Increase Button Manifold Gas Pressure Decrease Button Minimum Manifold Pressure Set Button Maximum Manifold Pressure Set Button W (GND) <CN186> RorV BL REMOTE CONTROLLER BL WW BL Y R Y Y R R WATER LEVEL ELECTRODE BK <CN89> BL W R BK W G BL BL WW BL BK W RorG BL BL W R BK W G BL BL BL <DIP SWITCH> BL BL MAIN CIRCUIT BOARD FLAME ROD <CN101> BL Other Unit in Quick Connect Multi System (For Quick Connect Multi System Only) Quick Connect Cord 2(Optional) R BK W G BL BL R BK W G BL BL BL WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW WW <CN38> GY BL O BK BL R BL W BR HIGH-LIMIT SWITCH THERMAL FUSE G W W R BK W W RorBL RorBL (Pulse) (Vcc) (GND) G Y R BL BLorG GROUND <CN27> BR Y BL R W <CN104> W BKorBL Y R BL O BK GROUND HEAT EXCHANGER FLOW SENSOR <CN102> W Y W W W W W W WW WW WW WW WW WW WW WW W W W W WW WW WW WW WW WW WW WW FAN MOTOR BR Y BL R BR(Vdc) Y(FG) BL(GND) R(Vcc) BR Y BL R BK BK W <CN103> POWER CIRCUIT BOARD W <CN92> FREEZE PREVENTION HEATER BK(W) G W(BK) GROUND LIGHTNING PROTECTION <AC120V> BK(W) W(BK) GROUND G
