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A.O. Smith Master-Fit 100 Series, Service Handbook

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Servicing should only be performed by a Qualified Service Technician

WHITE RODGERS IGNITION CONTROL BOARD

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Summary of Contents for Master-Fit 100 Series

Page 1: ...01 SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN Service Handbook COMMERCIAL GAS WATER HEATERS FOR MODELS BTN 120 thru 400 A Series 100 108 BTR 151 201 Series 100 101 INSTALLATI...

Page 2: ......

Page 3: ...51 201 ELECTRICAL SEQUENCE 19 OPERATING SEQUENCE FLOW CHART 20 HEATER CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND TROUBLESHOOTING 21 IGNITION CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND TROUBL...

Page 4: ...ied Agency Any individual firm corporation or company that either in person or through a representative is engaged in and is responsible for 1 the installation testing or replacement of gas piping or...

Page 5: ...s required for testing pressure switches and can replace a gas pressure gauge draft gauge or slack tube manometer for checking gas pressure UEi model EM200 or equivalent Water pressure gauge w lazy ha...

Page 6: ...o check its operation 3 Check the operation of the limit and operating controls 4 Check the vent system seams and joints and ensure that there is no discharge of flue products into the room 5 Check th...

Page 7: ...the installed space The vent system on one or more gas fired appliances can experience down drafts due to the outdoor air pressure being greater than the ambient air pressure in the installed space Wh...

Page 8: ...ommunicate with the outdoors and must communicate through a vertical or horizontal duct to the outdoors or spaces crawl or attic that freely communicate with the outdoors and must have a minimum free...

Page 9: ...ue to thermal expansion Thermal expansion can cause premature tank failure leakage This type of failure is not covered under the limited warranty Thermal expansion can also cause intermittent Temperat...

Page 10: ...roved reducing thimble is used A service clearance of 24 61 cm should be maintained from serviceable parts such as Temperature pressure relief valves baffles digital thermostats cleanout openings or d...

Page 11: ...s using natural draft venting The vent must extend at least 3 feet above the highest point where it passes through a roof of a building and at least 2 feet higher than any portion of a building within...

Page 12: ...y Gas Inlet and the Supply Gas Pressure Tap The top view of the gas valve shown on the right shows the Main Gas Regulator Manifold Pressure Tap Top Knob and the Limited Bleed Vent Port The main gas re...

Page 13: ...The draft inducer does not pressurize the exhaust For larger applications BTN and BTR 151 201 water heaters can be common vented together either in a tapered manifold or constant size manifold Follow...

Page 14: ...Btu hr Rise Vent Connector Diameter Inches 150 000 154 000 1 Ft 6 6 6 6 6 6 6 6 150 000 154 000 2 Ft 6 6 6 6 6 6 6 6 150 000 154 000 3 Ft 6 6 6 6 6 6 6 6 Number of Heaters Combined Input Btu hr Manif...

Page 15: ...2 12 10 10 9 9 8 4 1 100 000 14 14 14 12 12 12 10 9 MODEL BTN 310 Input 310 000 Btu hr Total Vent Height Feet Vent Connector Size 6 inches 6 8 10 15 20 30 50 100 Input Btuh hr Rise Vent Connector Diam...

Page 16: ...URE SWITCH TABLE BTN Models BTR Models Pressure Setting To Close Switch Inches W C 120 2 40 0 07 154 2 20 0 07 180 250 1 60 0 07 199C 3 00 0 10 199 200 1 95 0 07 275 2 30 0 07 310 2 60 0 10 366 2 00 0...

Page 17: ...15 Servicing should only be performed by a Qualified Service Technician THERMOSTAT AND IGNITION CONTROL BOARD VIEW...

Page 18: ...16 Servicing should only be performed by a Qualified Service Technician WHITE RODGERS INTEGRATED CONTROL THERMOSTAT...

Page 19: ...17 Servicing should only be performed by a Qualified Service Technician WHITE RODGERS IGNITION CONTROL BOARD...

Page 20: ...18 Servicing should only be performed by a Qualified Service Technician GAS CONTROL VALVE BURNER AREA VIEW...

Page 21: ...he time the Gas Valve opens the Ignition Control Board waits 3 seconds and then shuts of power to the Silicon Nitride Igniter 11 From the time the Silicon Nitride Igniter s power is shut off the Ignit...

Page 22: ...20 Servicing should only be performed by a Qualified Service Technician OPERATING SEQUENCE FLOW CHART...

Page 23: ...sent from on off switch center black wire to ground Check conditions above Check wiring from switch to break box Power is present from center on off terminal Check power from on off switch to ignition...

Page 24: ...conds at the end of the last cycle 3 Flashes Draft proving pressure switch failed to close within 5 seconds after the inducer was started The low gas pressure switch closes at 5 2 0 4 W C may have rem...

Page 25: ...er switch is On TEST 1 120 VAC check to water heater ON OFF switch Check for 115 125 VAC black wire to ground 115 VAC check to E13 Terminal and 2B receptacle IF THEN Voltage is not present from on off...

Page 26: ...F If water is below 193 F continuity is correct Continuity is not present meter reads 0 L Replace ECO sensor if water temperature is below 193 F Water is less than 120 F Reset status LED should be on...

Page 27: ...Upper Temperature Probe continuity check Red wire to red wire Turn supply power Off for this test IF THEN Test indicates no continuity Replace probe Continuity is indicated Probe should be okay also...

Page 28: ...t control by interrupting power note possible reasons for this from flashing LED code Replace ignition board Pin 1 to ground has voltage Proceed Pin 3 to ground has no voltage Check wiring harness and...

Page 29: ...blower outlet exhaust damper is open Replace blower draft proving switch NATURAL GAS ONLY 24V is present from each switch terminal to ground Check wiring from blower switch to low gas pressure switch...

Page 30: ...4 plug pin 2 to 4 Check wiring and connection from E4 plug to HSI receiving plug Replace HSI Assembly Continuity is present Resistance should be between 11 and 20 Ohms at a temperature of 77 F Voltage...

Page 31: ...warm up no ignition Check for 24V from E1 Pin 12 to ground during 4 second trial Yes Continue No Replace Ignition Board No voltage present E4 Pin 12 to ground Replace ignition board 24 Volt was presen...

Page 32: ...N BURNER IF THEN Meter reads 0 or 1 Check meter scale setting to read between 550 and 650 Ohms Replace Gas Valve Meter indicates pilot and main coil have continuity Valve should be okay still no gas t...

Page 33: ...ng and plug connections of HSI assembly plug and ignition board receptacles E1 Pin 2 Check that HSI assembly is not cracked or dirty Check that flame prover will be in main flame Replace HSI assembly...

Page 34: ...oard receptacle E4 Replace lower temperature probe Continuity check red wire pin to red wire pin on upper temperature sensor shows 1 or 0 E3 See Test 4 Check wiring and plug connections to heater cont...

Page 35: ...rgy Cut Out has opened Check for excessively hot water 203 F or higher Check the resistance of the temperature probes and continuity of the high limit ECO No power Check the breaker Tank is at a set t...

Page 36: ...34 Servicing should only be performed by a Qualified Service Technician WIRING DIAGRAM...

Page 37: ...35 Servicing should only be performed by a Qualified Service Technician NOTES...

Page 38: ...36 Servicing should only be performed by a Qualified Service Technician NOTES...

Page 39: ...37 Servicing should only be performed by a Qualified Service Technician NOTES...

Page 40: ...Central link of www hotwater com for a listing of available Service Handbooks For additional information contact A O Smith Corporation 500 Tennessee Waltz Parkway Ashland City TN 37015 1 800 527 1953...

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