A.O. Smith 120 trough 500 Water Heater User Manual
Contents
1. CONNECTION DIAGRAM SCHEMATIC DIAGRAM WITH NORMAL SERVICE SWITCH E Ly HOT 120 Lp NEU Lg GND cc 1 3 DAMPER t i DRIVE 2 i 2 4 Pe QUICK CONNECT ges ea ee ORE RENE NEEDE aren 4 z STATES n E DAMPER 24 VOLT TRANSFORMER DRIVE x E C O N Ry N C en 2 M QUICK TEMPERATURE m NORMAL SERVICE m CONTROL 4 Rg N O m SWITCH SHOW IN ECO THST NORMAL POISTION TAIRI l RELAY Ro N O COIL L S LIMIT SWITCH kt ON CKT BOARD GND 3 z o4vVTRANS 181 10 aK LaGROUND MV 258 gy wer TIT MV PV nee L NEUTRAL MOLEX 2N BU 2 CONNECTOR W JUNCTION BOX TAn Eja kag a PV MV amp n MVP Hus e Se az PET E z 553 3 Z oim 574 H Em ah 5 erem HY 3 GROUND HIGH VOLTAGE mem g iy RET w FA LEAD FLAME 7 FLAME SENSOR IGNITOR SENSOR A TH TR GAS VALVE WHITE RODGERS WIRING DIAGRAM BTR 120 THRU 500 A WHEN EQUIPPED WITH SERT FACTORY WIRED A HONEYWELL IGNITION MODULE AND PILOT2. AA Smith commercial Water Heaters Service Handbook BTR BTRC Models 120 Through 500 Series 100 109 Note This Service Information Also Applies To BTC Models 120 500 Prepared By The Training Department in Ashland City Tennessee ba the USA 0401 TC 043R3 1518 5 SERVICE HANDBOOK BTR HANDBOOK TABLE OF CONTENTS PAGE PAGE Troubleshooting continued Introduction 1 2 Troubleshooting the Efflkal 30 31 Wire Harness Test 32 Installation IID Module 33 Clearances 3 4 Pilot Spark 34 Air Requirements 5 9 Pilot Valve 35 36 Contaminated Air 10 Main Burner Test 37 Flammable 10 Flame Rectification 38 Gas Pressure 11 IID Module 39 Gas Valve 12 Main Gas Valve 40 41 Venting 13 15 Wiring Schematics Natural and Propane Gas 42 Sequence of Operation Mechanical 16 Service Charts 43 Electrical 17 18 General Questions amp Answers 44 Troubleshooting Transformer 19 Parts List 45 50 High Limit 20 21 Damper on Standby 22 Component Part Information 51 PC Board 22 23 Thermostat 24 Service Check List 52 53 Damper call for heat 25 26 Effikal Damper 27 Comments 54 Effikal Harness Test 28 Normal Operation 28 29 BTR WORKBOOK INTRODUCTION This service handbook is designed to aid in servicing and troubleshooting Smith BTR water heaters the field No duplication or reproduction of this book may be made without the express written authorization of the A O Sm
3. 5 Pilot Burner Propane 6 GAS KO endure xu pd pe 7 Pressure Plate e e a ue e erede ey 8 Screws Self Tapping 9 Control Ignition Module 10 Control Dual w ECO 11 2 2 12 13 Instruction Manual 14 Main Burner Orifice Natural 15 Main Burner Orifice Propane 16 17 T amp P Relief Valve 18 Transforme TERI D 19 Inlet Tube iecit 20 Gas Valve 2 21 Gas Valve 22 Off On SwWItCI iua ertt rrr eerte A O Smith Water Products Irving Texas 2000 BTR 197 098044 5 47 BTR 198 098044 5 192322 193873 0 193314 0 193314 1 99036 99037 69852 193325 192828 192957 4 76244 2 193927 76243 32 76243 49 43817 42 4 99465 7 193444 192626 192827 2 192827 3 193243 Service Handbook Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK BTR MODELS 120 through 500 Series 104 105 SEE DETAIL A USED ON BTR 200 A O Smith Water Products Service Handbook Irving Texas 2000 48 Training Department
4. STEP 9 TEST THE DAMPER Visually check the damper blade position IF 1 THEN The damper does NOT open fully e Replace the damper assembl e Gotostep 10 o Z SoSo o o The damper DOES open fully e Goto step 10 A O Smith Water Products Service Handbook Irving Texas 2000 25 Training Department 5 SERVICE HANDBOOK STEP 10 TEST DAMPER OUTPUT STEP 10 TEST DAMPER OUTPUT call for heat the damper relays receives power through the yellow wire and power to the motor is interrupted Then the motor clutch is disengaged and the damper opens The damper proves it is open via an end switch before power flows through the red wire from the PC board Place the red test probe on the solder joint of the red wire connection to the damper PC board IF 1 1 1 THEN The meter does not read 24 VAC and the e Replace the PC board end switch is closed The meter reads 24 VAC Gotostep 11 Note The spring rotates the damper blade assembly to the open position This closes an end switch A O Smith Water Products Service Handbook Irving Texas 2000 26 Training Department 5 SERVICE HANDBOOK EFFIKAL Series 110 and 111 began using the motor open motor close Effikal Damper wiring colors from the damper PC Board are different from previous series BTR C and BTC Models
5. BY INSTALLER IF ANY OF THE ORIGINAL WIRE AS SUPPLIED MUST BE REPLACED USE ONLY TYPE 105 C THERMOPLASTIC OR EQUIVALENT FLAME SENSOR IGNITION CABLE MUST 250 C TYPE F IF ANY OF THE ORIGINAL WIRE AS SUPPLIED MUST BE REPLACED USE ONLY 105 C THERMOPLASTIC OR BLUE PV EQUIVALENT WHITE MV PV RED MV GAS VALVE FOR BTR 500 A ONLY A O Smith Water Products Service Handbook Irving Texas 2000 42 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK GENERAL SERVICE CHART SOLUTION DAMPER OPENS NO POWER TO IID MODULE DAMPER NOT FULLY OPEN ASSEMBLY _REPLACE DAMPER DEFECTIVE PROTECTOR SWITCH REPLACE PC BOARD PILOT LIGHTS SPARKS CONTINUOUSLY PILOT FLAME NOT PROVING SEE FLAME RECTIFICATION STEP 16 INTERRUPT 120 VAC POWER EFFIKAL REPLACE DAMPER CONTROL CHECK GROUND WIRE ATTACHMENT HEATER WILL NOT IGNITE Nee FLAME EXISTANCE CLEAN OR REPLACE PILOT ASSEMBLY PILOT GAS NOT COMPLETELY CHECK SUPPLY GAS PRESSURE INTERRUPTED AT END OF eee HEATING CYCLE WEEPING TEMPERATURE AND THERMAL EXPANSION ADD THERMAL EXPANSION TANK PRESSURE RELIEF VALVE FAULTY VALVE REPLACE RELIEF VALVE LARGE VOLUME WATER EXCESSIVE WATER CHECK WIRING RELIEF FROM T amp P VALVE TEMPERATURE REPLACE DUAL CONTROLLER FAULTY RELIEF VALVE REPLACE RELIEF VALVE PREMATURE TANK CONDENSATION INCREASE STORED WATER LEAKAGE TEMPERATURE AND CONFIRM PROPERLY SIZED APPLICATION CONTAM
6. E Switch N Motor Lead Terminal Li es Heater Harness Rr AAAA AIA AEA Ekia Effikal Control Cover Photo of kit mounting Effikal Style The heater harness wires still serve the same function Black 24V Constant if high limit closed Yellow 24V To damper if the thermostat is closed 2 3 24 From damper to IID if damper closes end switch White Neutral common Orange Brown Yellow Black From Heater Male Plug Female Plug A O Smith Water Products Service Handbook Irving Texas 2000 27 Training Department 5 SERVICE HANDBOOK HARNESS CHART HeaterHarness Function Damper Harness 24V Hot 24V from Therm 2 Orange 24V from damper 3 Y ellow 24V common 4 Black Series 110 and 111 heaters and converted model BTR C and BTC heaters with Effikal Dampers NORMAL OPERATION Condition e Heater on standby e Damper closed e High Limit closed Wires are from left to right Black Yellow Brown White TEST FOR 24VAC BETWEEN BLACK COMMON STEP A AND BROWN STEP A TEST FOR 24VAC BETWEEN BLACK COMMON AND BROWN IF 1 THEN 24VAC is present Continue to Step B 24VAC is not present See Troubleshooting Step A1 A O Smith Water Products Service Handbook Irving Texas 2000 20 Training Department 5 SERVICE HANDBOOK
7. 2000 40 Training Department 5 SERVICE HANDBOOK STEP 18B MAIN GAS VALVE COIL CHECK PILOT GAS MANIFOLD PRESSURE TAP lt The PV wire is connected to the blue wire MV PV wire on the 110 is connected to the white wire The MV wire is disconnected from the gas valve MANIFOLD GAS MANIFOLD PRESSURE TAP STEP 18B MAIN GAS VALVE COIL CHECK BTR 500 ONLY e Pilot lights e Sparking stops e No main burner ignition Test Procedure e Power off e Disconnect red main valve wire from module MV terminal Meter set to test for DC amperage e 10A wire to red gas valve wire COM wire to MV terminal of ignition module e Turn power on to heater e After pilot lights and sparking stops THEN 25 to 35 DC Amos is not present e Replace the gas valve 25 to 35DCA is present e Main burner gas should ignite Be certain to correct you meter wire connections and setting before performing further tests A O Smith Water Products Service Handbook Irving Texas 2000 41 Training Department 5 SERVICE HANDBOOK BTR WIRING DIAGRAM NATURAL AND PROPANE GAS Honeywell Ignition System 110 109 Series
8. BTR TANK TYPE HEATERS SERVICE WORKBOOK BTR MODELS 120 through 500 continued Series 104 111 HONEYWELL IGNITION MODULE PC BOARD amp DRIVE MOTOR replacement parts for draft hood damper drive MOUNTING BRACKET MOUNTING SCREWS 500 Gas Valve WHITE RODGERS STD BTR 120 THRU 400 2 078469 0 250 032 078468 0 99593 0 250 X 032 192834 0 187 X 032 A O Smith Water Products Service Handbook Irving Texas 2000 49 Training Department tem ONoOoahRWDND 11 11 12 13 14 15 16 17 18 19 20 21 22 1 2 3 4 5 6 7 8 9 10 11 11 12 13 14 15 16 17 18 19 20 21 22 For complete parts list call 1 800 433 2545 BTR TANK TYPE HEATERS SERVICE WORKBOOK PARTS LIST FOR BTR Models 120 Through 500 A Series 104 Through 109 Series Series 106 107 have a service switch on Circuit Board 6522 Series 108 109 have new main burner production method Both parts will automatically be shipped Parts Description Main Burner Orifice Bracket Main Burner Main Burner w Pilot Bracket Pilot Burner Natural Pilot Burner Propane Gasket Cleanout Pressure Plate Cleanout Screw Self tapping Cleanout Control Ignition Module Control Dual w eco Drafthood Drafthood 110 111 Series Manifold Instruction Manual not illustrated Main Burner Orifice Natural Main Burner Orifice Propane Anode Rod
9. T amp P Relief Valve Transformer Inlet Tube Gas Valve Natural Gas Valve LP Off On Switch Parts Description Main Burner Orifice Bracket Main Burner Main Burner w Pilot Bracket Pilot Burner Natural Pilot Burner Propane Gasket Cleanout Pressure Plate Cleanout Screw Self tapping Cleanout Control Ignition Module Control Dual w eco Drafthood Drafthood 110 111 Series Manifold Instruction Manual not illustrated Main Burner Orifice Natural Main Burner Orifice Propane Anode Rod T amp P Relief Valve Transformer Inlet Tube Gas Valve Natural Gas Valve LP Off On Switch A O Smith Water Products Irving Texas 2000 BTR 120 98044 3 192322 193873 0 193314 0 193314 1 99036 99037 69852 193325 192828 193597 0 76244 0 193927 76243 32 76243 49 43817 38 2 99465 7 193444 193729 192827 2 192827 3 193243 251 9804447 98047 193873 0 193314 4 193314 3 99036 99037 69852 193325 192828 193287 76244 3 193927 76243 76243 43817 38 4 192467 193444 192827 2 192827 3 193243 BTR 154 98044 3 98047 193873 1 193314 0 193314 1 99036 99037 69852 193325 192828 193597 1 76244 0 193927 76243 30 76243 46 43817 38 2 99465 7 193444 192626 192827 2 192827 3 193243 BTR 275 98044 5 98047 193873 1 193314 4 193314 3 99036 99037 69852 193325 192828 193287 76244 2 193927 76243 76243 180618
10. SERVICE HANDBOOK MAKE UP AIR HORIZONTAL DUCTS wee A ee f art ATP 5 7 2 4 5 M 5 B 7 4 pes Lo a pe ME T n es 4 E AA aed eod When the heater is installed in an interior room with no roof access for vertical ducts horizontal make up air ducts should be installed When using horizontal ducts two openings are required one within 12 inches of the top of the enclosure and one within twelve inches of the bottom of the enclosure Each opening shall have a free area of not less than 1 square inch per 2000 BTUH of the total input of all appliances within the enclosure A O Smith Water Products Service Handbook Irving Texas 2000 8 Training Department 5 SERVICE HANDBOOK INSUFFICIENT MAKE UP AIR BACKDRAFT Insufficient make up air is a major cause of combustion problems One common example is in a restaurant installation where exhaust vent equipment was not considered in sizing make up air requirements This may result in air being backdrafted by the restaurant exhaust equipment through the heater causing flue gas spillage flame roll out improper combustion inconsistent pilot operation and or erratic heater shut down A O Smith Water Products Service Handbook Irving Texas 2000 9 Training Department 5 SERVICE HANDBO
11. e Tank calls for heat e PV terminal of module has 24 Vac e No Pilot flame lest Procedure e Turn off power to heater e Meter set to test for DC amperage on AOS meters the black wire is in the port the red wire is in the 10 port the dial is set to 20M 10A in the DC AMP test area Blue PV wire is disconnected from the ignition PV terminal Install meter in series between gas valve and ignition module 10A wire to blue gas valve lead common wire to PV module terminal e Turn power on to heater after module receives 24V 75 to 85 DCA is not present e Replace the gas valve 75 to 85 DCA is present e Pilot should work if gas not air is present to pilot Power off reattach blue gas valve wire to PV terminal of module A O Smith Water Products Service Handbook Irving Texas 2000 36 Training Department 5 SERVICE HANDBOOK STEP 15 MAIN BURNER TEST Em 2 W WW ON SES mete e S Ue 0 LI Ta Note series 108 and 109 implemented a new main burner stamping process burners appear the same as illustrated STEP 15 MAIN BURNER TEST Visually check for main burner THEN The main burner ignites The main burner does not ignite e Goto step 16 A O Smith Water Products Service Handbook Irving Texas 2000 37 Training Department 5 SERVICE HANDBOOK STEP 16 FLAM
12. NORMAL OPERATION continued Condition e Thermostat closed damper in process of opening STEP B TEST FOR 24VAC BETWEEN BLACK AND ORANGE Wo THEN 24VAC is present Continue to Step C 24VAC is not present See Troubleshooting Step A2 Condition e Thermostat closed damper fully open STEP TEST FOR 24VAC BETWEEN BLACK AND YELLOW Wo THEN 24V AC is present Continue to Step 11 2AVAC is not present See Troubleshooting Step A3 A O Smith Water Products Service Handbook Irving Texas 2000 29 Training Department 5 SERVICE HANDBOOK TROUBLESHOOTING THE EFFIKAL STYLE DAMPER Condition Thermostat closed damper Wires are from left to right Black Yellow Brown White TEST BETWEEN BLACK COMMON AND BROWN THE DAMPER BOARD YO 24VAC is not present e See Steps 1 thru 4 Check the harness plugs connecting heater and damper for looseness or damage Condition Thermostat closed damper in process of opening STEP A2 TEST FOR 24VAC BETWEEN BLACK AND ORANGE THEN 24VAC is present 24VAC is not present See Step 7 e Check the harness plug connecting heater or damaged A O Smith Water Products Service Handbook Irving Texas 2000 30 Training Department 5 SERVICE HANDBOOK TROUBLESHOOTING THE EFFIKAL STYLE DAMPER continued Condition Thermostat closed damper is open fully STEP A3 TEST FOR
13. PRODUCTS MANUAL 24 Volt EN NN Water Heater Models Part Number BTR 120 200 193933 0 BTR 250 500 193933 1 BTR water heaters can be used ALL SEANS ON POSTE DIAGRAM E wa POWER VENTER with power vent kits for sidewall SIDE POWER VENTER TO BE venting A O Smith offers power vent kits for use on installations with pressure em a maximum of 100 equivalent feet of vent piping The power vent kits also use type B vent materials When power venting specific exterior clearances must be maintained as outlined in the National Fuel Gas Code NFPA 54 ANSI A223 1 sec 7 8 APPLIANCE A O Smith Water Products Service Handbook Irving Texas 2000 15 Training Department 5 SERVICE HANDBOOK BTR SEQUENCE OF OPERATION Flue damper closes 2 Flue damper opens 1 Thermostat calls for heat gt 7 Thermostat satisfies 4 Pilot gas opens Pilot sparks and flame proves 3 Intermittent A Ignition Control A 8 Main and pilot burners OFF SEQUENCE OF OPERATION To understand tank type water heaters an examination of their sequence of operation is necessary When the thermostat calls for heat the relay in the draft hood assembly activates de energizing the flue damper motor The damper opens and power flows to the IID Intermittent Ignition Device This activates the module to open the pilot valve and begin sparking at th
14. ffikal Power to Damper Power to Damper Relay 4 Interupted 2 Interrupted Damper Motor Energized and Damper Closed A O Smith Water Products Service Handbook Irving Texas 2000 18 Training Department 5 SERVICE HANDBOOK TROUBLESHOOTING BTR WATER HEATERS To troubleshoot a water heater check that e 120 VAC is supplied to the heater e the tank is full of water e gas is supplied to the unit STEP 1 TEST THE TRANSFORMER STEP 1 TO TEST THE TRANSFORMER Using a multimeter test for 24 VAC between the secondary transformer terminals Check that the 120 VAC is supplied from the On Off Switch if not replace switch Check that the 120 VAC is supplied from transformer The meter reads 24 VAC e Goto step 2 A O Smith Water Products Service Handbook Irving Texas 2000 19 Training Department 5 SERVICE HANDBOOK 2 HIGH LIMIT LEFT TERMINAL TEST STEP 2 HIGH LIMIT LEFT TERMINAL TEST Test for 24 VAC between the left high limit terminal and ground THEN The meter does not read 24 e Check wiring between transformer and high limit The meter reads 24 VAC e Goto Step Note The high limit Energy Cut Off opens if the tank water temperature exceeds 205 degrees The control is resettable manually when the tank water temperature drops below 185 degrees A O Smith Water Products Se
15. 24VAC BETWEEN BLACK AND YELLOW THEN 24V AC is present This is correct continue to Step 11 24V AC is not present See Step 9 Check the harness plug connecting Check that cam on shaft rotates with shaft Replace the damper board A O Smith Water Products Service Handbook Irving Texas 2000 31 Training Department 5 SERVICE HANDBOOK 11 WIRE HARNESS TEST Honeywell MPLS MN 55422 8600M CONTINUOUS RE TRY G 100 SHUTOFF 4 AUTO 90 SEC TRIAL FOR IGNITION Ks ES 60 Hz If module has been used with PV 1A Lnd ped vent damper it will only work with damper connected Explosion hazard Can cause serious injury or death This deyice can malfunction if it gets wet Never try to usea device that has been wet replace it 97 4152 REV A STEP 11 WIRE HARNESS TEST Test for 24 VAC between terminal 24V on the IID module and 24V GND IF 1 THEN 24 VAC is not present e Check the wiring harness e Gotostepi2 Z 24 VAC is present e step 12 Note This test may be easier to conduct by removing the red wire from the IID terminal Test for 24 VAC between the red wire and ground Reconnect the red wire to the 24V terminal after the test A O Smith Water Products Service Handbook Irving Texas 2000 32 Training Department 5 SERVICE HANDBOOK 12 MO
16. 42 3 192467 193444 192626 192827 2 192827 3 193243 50 on 104 thru 109 series heaters BTR 180 BTR 199 BTR 200 98044 5 192322 193873 0 193314 0 193314 1 99036 99037 69852 193325 192828 192957 0 76244 2 193927 76243 35 76243 51 43817 38 4 99465 7 193444 193729 192827 2 192827 3 193243 305 9804447 192322 193873 0 193314 4 193314 3 99036 99037 69852 193325 192828 193287 76244 3 193927 76243 37 76243 48 43817 38 4 192467 193444 192827 2 192827 3 193243 980445 192322 193873 0 193314 0 193314 1 99036 99037 69852 193325 192828 192957 0 76244 2 193927 76243 32 76243 49 43817 38 4 99465 7 193444 193729 192827 2 192827 3 193243 BTR 365 98044 9 192322 193873 0 193314 4 193314 3 99036 99037 69852 193325 192828 193287 76244 4 193927 76243 32 76243 49 180618 42 4 192467 193444 192626 192827 2 192827 3 193243 BTR 250 98044 5 98044 5 192322 098047 193873 0 193873 0 R 193314 4 193314 1 193314 3 99036 99036 99037 99037 69852 69852 193325 193325 192828 192828 192957 0 193287 76244 2 76244 2 193927 193927 76243 32 76243 xx 76243 48 76243 xx 180618 42 3 180618 42 4 99465 7 192467 193444 193444 192626 192626 192827 2 192827 2 192827 3 192827 3 193243 193243 BTR 400 500 98044 9 98044 9 192322 192322 193873 0 193873 0 193314 4 193314 4 193314 3 193314 3 99036 99036 99037 99037 69852 69852 193325 1
17. 93325 192828 192828 193287 193287 76244 4 76244 4 193927 193927 76243 31 76243 28 76243 48 76243 44 180618 42 3 180618 42 4 192467 192467 193444 193444 192626 192626 192827 2 193366 0 192827 3 193366 1 193243 193243 Service Handbook Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK COMPONENT PART INFORMATION Pc SPECIFICATIONS AOS PART NUMBERS 120 180 RANGE 4 5 AOS 192828 CONTROLLER THERMOSTAT DIFFERENTIAL LIQUID FILLED ANTI STACKING HIGH LIMIT OPENS 205 FIXED ECO MANUAL RESET BELOW 185 GAS VALVE NATURAL GAS BTR 120 400 24VAC 60hz AOS 192827 2 6A 7 to 3 5 W C STEP OPEN BTR 500 24VAC 60hz AOS 193366 0 Dual Gas Valve STEP OPEN PROPANE BTR 120 400 AOS 192827 3 GAS 2 5 10 W C gt OPEN BTR 500 24VAC 60hz Dual Gas Valve STEP OPEN INTERMITENT NATURAL GAS 24 50 60 HZ AOS 193325 IGNITION AND 7 MICROAMP SIGNAL DEVICE PROPANE CONTINUOUS RETRIAL CONTROL GAS ASSEMBLY MOTOR 24 VAC 60 HZ 120 RPM AOS 6521 5 WATT W RELAY TRANSFORMER 120 V PRIMARY 24 VAC AOS 193444 SECONDARY 40 50 60 HZ CLASS 2 Smith Water Products Service Handbook Irving Texas 2000 51 Training Department AOS 193366 1 BTR TANK TYPE HEATERS SERVICE WORKBOOK BTR SERVICE CHECKLIST This service checklist may be photo copied to assist with BTR service call This checklist is intended to aid the Service
18. AIR FOR COMBUSTION 10 CUBIC FEET OF AIR PER 1 000 BTU 2 5 CU EXCESS AIR Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1000 BTUH input of the gas input The National Fuel Gas Code also recommends an additional 2 5 cu ft of excess air This 12 5 cu ft minimum supply air per 1000 BTUH input applies to natural and propane gas models The National Fuel Gas Code also specifies minimum make up air opening sizes for various building installations Ref NFPA 54 ANSI Z223 1 sec 5 3 A O Smith Water Products Service Handbook Irving Texas 2000 Training Department 5 SERVICE HANDBOOK MAKE UP AIR DIRECT COMMUNICATION 1 Square Inch Per 4 000 BTUH A fresh supply of make up air for combustion can be supplied to the heater through make up air ducts which directly communicate with the out of doors Two openings are required one within 12 inches of the top of the enclosure and one within twelve inches of the bottom of the enclosure Each opening shall have a free area of not less than 1 square inch per 4000 BTUH of the total input of all appliances within the enclosure The lower opening is primarily providing combustion air The upper opening is providing vent dilution air and acts as a relief opening for flue gases should the vent become obstructed or a downdraft condition occur Additionally when the heater is installed in a confined space and co
19. Agent in determining that the A O Smith Water Heater has been properly installed and is operating correctly Because the circumstances of each installation may vary greatly it is not intended to be an all inclusive list of the problems that the Service Agent may encounter Any item checked no on this list should be thoroughly investigated and corrective action taken if required SERVICE AGENT INSTALLATION DATE MODEL SERVICE DATE SERIAL NUMBER LOCATION ADDRESS GAS TYPE CHECK ONE NATURAL _ 0 PHONE PROPANE l Check Clearances circle answer A Are exterior clearances adequate yes B Are interior clearances adequate yes Comments Check Makeup Air Requirements A Is the quantity of make up air adequate per the National Fuel Gas Code yes Comments B Is the quality of make up air adequate yes Comments Gas Pressure fill in blank A Supply gas pressure inches of w c B Manifold gas pressure main burner inches of w c Comments IV Venting check A Properly sized per the National Fuel Gas Code yes B Does the installation have mechanically assisted venting yes If so is it operational yes Comments V WATER PIPING A O Smith Water Products Service Handbook Irving Texas 52 1999 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK Is the system properly sized yes no I
20. C electrical power supply properly fused yes no D Flammables Are flammable materials located in the area of the water heater yes no Are flammable vapors located in the area of the water heater yes no Comments This service checklist may be photo copied to assist with BTR service call A O Smith Water Products Service Handbook Irving Texas 53 1999 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK COMMENTS Author Terry Mulder A O Smith Water Products Service Handbook Irving Texas 54 1999 Training Department
21. DULE TEST AWARNING S8600M CONTINUOUS RE TRY G 100 SHUTOFF IP AUTO IGNITION 90 SEC TRIAL FOR IGNITION A ANSI 221 20 24V 60 Hz If module has been used with PV 1A MAX MV 1A MAX vent damper it will only work with damper connected Explosion hazard Can cause serious injury or death This device can malfunction if it gets wet Never try to use a device that has been wet replace it 97 4152 REV STEP 12 IID MODULE TEST Power to the Pilot Valve Using a multimeter test for 24 VAC between terminal PV and 24V GND on the IID during the 90 second trial for ignition THEN The meter does not read 24 VAC and the e Replace the module module is not between ignition trials The meter does read 24 VAC to step 13 A O Smith Water Products Service Handbook Irving Texas 2000 33 Training Department 5 SERVICE HANDBOOK 13 PILOT SPARK TEST T WIEN U 1 cd m Wo WR E ow v STEP 13 PILOT SPARK TEST Visually check for spark at the pilot assembly Note The pilot burner mounts on the left side of the main burner Check for e 7 64 spark Spark cable continuity Power To Module May Be Interrupted To Reset 90 sec 5 min 90 sec 5 min 90 sec Continuous Call for Sparking No Sparking No Sparking Trial heat Sparking Sparking Sequence A O Smith
22. E RECTIFICATION Igaitor Sensor f STEP 16 FLAME RECTIFICATION Note Flame rectification means that an alternating current AC signal is changed to a direct current DC signal The pilot flame is the switch which connects the pilot hood to the igniter and ground If the pilot hood and igniter sensor had the same surface area the flame switch would conduct an AC signal Because the pilot surface is greater than the igniter surface the signal becomes a DC current that the module can interpret The pilot hood must be properly grounded and the pilot flame must remain in contact with both surfaces for the flame proving signal to remain constant If the signal is broken for just 8 tenths of a second the heater will cycle off Sparking at the pilot will continue if an insufficient signal is received by the module Sparking at the pilot will stop almost immediately after the ignition module senses the pilot flame THEN Sparking continues after pilot is e Check wire connections established e Check flame contact between hood and lighter e Clean pilot burner surfaces eplace pilot assembl e Sparkingstops 1 e Gotostep 17 A O Smith Water Products Service Handbook Irving Texas 2000 38 Training Department 5 SERVICE HANDBOOK 17 MODULE TEST AWARNING Explosion hazard Can cause serious injury or death This device can malf
23. INATED AIR REMOVE CONTAMINANTS SUPPLY CLEAN COMBUSTION AIR WATER HAMMER ADD WATER HAMMER ARRESTOR REDUCE WATER PRESSURE REMOVE UNNECESSARY CHECK VALVES THERMAL EXPANSION ADD THERMAL EXPANSION TANK DEPLETED ANODES SCHEDULE ANODE CHECKS REPLACE AS NEEDED DAMPER WILL NOT OPEN DAMPER MOTOR REPLACE MOTOR EFFIKAL REPLACE DAMPER CONTROL ASSEMBLY NO SPARK AT PILOT DAMPER FULLY OPEN DAMPER ASSEMBLY REPLACE PC BOARD SEE STEP 10 Services Switch may bypass problem until replacement part is received EFFIKAL REPLACE DAMPER CONTROL ASSEMBLY MODULE REPLACE IID STEP 12 SPARK CABLE REPLACE CABLE STEP 13 A O Smith Water Products Service Handbook Irving Texas 2000 43 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK GENERAL QUESTIONS AND ANSWERS Q What changes caused series 106 107 and 108 109 to be implemented A 106 and 107 series units changed from the momentary push button to a slide switch The 108 and 109 series implemented a new main burner construction process The damper boards with service switch and new style main burners will automatically be replacement parts for previous series heaters if parts are ordered Q What is unique about the Canadian BTRC models vs U S BTR models A The Canadian models have different dimensions to meet Canadian code requirements Q How much electrical power is required for a BTR water heater A The BTR models draw approximat
24. NSTALLATION When mechanically venting the following items are required ay escent Draft Inducer up to 300 000Btuh 1 Draft Inducer up to 305 000 thru 500 000 Btuh 90910 Draft Prover Switeh 1 95220 1 1 Draft Prover Switch 95220 1 Helay Switch 96695 Service Handbook 14 Training Department A O Smith Water Products Irving Texas 2000 5 SERVICE HANDBOOK POWER VENT KITS FOR SIDEWALL VENTING Damper Drive WATER HEATER TO SIDEWALL VENTOR WIRING INSTRUCTIONS 1 Disconnect thermostat wire assembly from damper 2 Plug female sidewall wire harness into male connector on damper 3 Plug thermostat wire assembly female into male on sidewall wire harness 4 Complete 120 Volt wiring to sidewall ventor as shown below Female plug to Damper To Damper Time Delay Motor Relay Orange 24 VAC to Relay J 40 Power Venter cable with Y connect 24 VAC to Pressure Switch Com To Relay White Blue To Pressure Switch Male plug to Cable From White Rogers Ti lt iim Ground White 120 Com Temperature Control gt and ECO mune 2 PRESSURE SWITCH NOTE Factory Wiring 24 Volt SEE WATER HEATER DIAGRAM FOR COMPLETE WATER HEATER WIRING 24 Volt e FOLLOW INSTALLATION INSTRUCTIONS FOUND TJERNLUND
25. OK CONTAMINATED AIR Rust Chips 89 Along with adequate make up air the quality of the air is important Contaminants combustion air can lead to premature heater failure Vapors from bleaches soaps waxes salts etc are drawn into the combustion chamber with the make up air and once fired mix with water vapor in the gases to form extremely corrosive hydrochloric or hydrofluoric acid and other corrosive byproducts 8 AIR FOR COMBUSTION Flammable Items Flammable items pressurized containers or any other potentially hazardous articles must never be placed on or adjacent to the heater Open containers of flammable material should not be stored or used in the same room with the heater A O Smith Water Products Service Handbook Irving Texas 2000 10 Training Department 5 SERVICE HANDBOOK GAS PRESSURE REQUIREMENTS Supply Gas Manifold Pressure ap Dirt Leg Manifold Gas Port PropmeGas Maximum Supply Pressure 13 8 w c Minimum Supply Pressure 11 w c Manifold Pressure The supply gas pressure is normally measured at the dirt leg or at the gas pressure tapping on the gas supply shutoff valve This reading must be measured with flowing gas The manifold gas pressure is measured at the manifold pressure tap of the gas valve when the gas is flowing A O Smith Water Products Service Handbook Irving
26. Texas 2000 11 Training Department 5 SERVICE HANDBOOK BTR GAS VALVE The gas valves used on all BTR water heaters are 24 volt AC combination step opening gas valves They incorporate the pilot valve main valve and gas pressure regulators into one body The inlet view of the valve features a filter screen and the top knob The top knob is a manual on off gas control for both the pilot and main gas valves When the top knob is placed on the black mark gas is supplied only to the pilot valve On the top view we see the pilot solenoid and pilot and main gas regulators The top view also displays the and TR terminals The pilot gas regulator is found under its cover screw It is factory preset at 3 5 w c but can be adjusted from 2 5 to 5 inches water column The main gas regulator is found under its cover screw It is factory preset to 3 5 inches w c and adjusts gas pressure output from 2 5 to 5 inches water column The two electrical terminals are marked TH and TR The TH terminal is the common between the pilot valve solenoid coil and the main valve solenoid coil The other wire emerging from the pilot solenoid connects to the pilot valve electrical output on the IID terminal PV The TR terminal connects directly to the main valve electrical output from the module terminal MV On the outlet view of the gas valve we see the pilot gas connection port manifold gas connecti
27. Water Products Service Handbook Irving Texas 2000 34 Training Department 5 SERVICE HANDBOOK STEP 14A PILOT VALVE OHM TEST DC VOLT 1090 OFF PTT 200 NRI ATO WAX Dg MAL 10 ee 0 u am h Wr 120 400 GAS VALVE STEP 14A PILOT VALVE OHM TEST If pilot assembly is sparking but no pilot flame is established disconnect the pilot valve solenoid leads Using a multimeter set to read ohms test for 20 ohms resistance 5 through the solenoid coil The meter dose not read 20 ohms plus or Replace gas valve minus 5 The meter does read 20 ohms plus or Gas valve should work Also check that minus 5 pilot gas is present and pilot tube or orifice are not blocked A O Smith Water Products Service Handbook Irving Texas 2000 35 Training Department 5 SERVICE HANDBOOK 14 PILOT VALVE TEST BTR 500 ONLY PILOT GAS MANIFOLD PRESSURE The MV PV wire on the IID is connected to the white wire MV wire on the IID is connected to the red wire MANIFOLD GAS MANIFOLD PRESSURE TAP STEP 14B PILOT VALVE TEST BTR 500 ONLY Testing the two coils of the Honeywell VR8404P 5004 gas valve used on the model BTR 500 only Because of built in diodes it is difficult to test for ohms resistance through these coils The following is a DC amperage check of the main and pilot coils
28. akage A Heavy build up on the bottom head and bottom portion of the flue pipes leads to more heat transfer at the top of the flues This can lead to stacking or erratic thermostat operation Q Anode rods provide additional protection against corrosion When should these be replaced A When large gouges or pits appear in the anodes replace them It is recommended that these be inspected every 6 months A O Smith Water Products Service Handbook Irving Texas 2000 44 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK BTR MODELS 197 AND 198 Series 100 101 A O Smith Water Products Service Handbook Irving Texas 2000 45 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK BTR MODELS 197 AND 198 continued Series 100 101 CLEANOUT ASSEMBLY PC BOARD amp DRIVE MOTOR replacement parts for draft hood damper drive W WHITE RODGERS STD BTR 120 THRU 365A 4 MOUNTING HONEYWELL IGNITION MODULE Pt No 6521 99593 0 250 X 032 078469 0 250 X 032 WIRE TERMINALS USED WITH ITEM 57 SHIELD A O Smith Water Products Service Handbook Irving Texas 2000 46 Training Department BTR TANK TYPE HEATERS SERVICE WORKBOOK PARTS LIST for BTR Models 197 and 198 Series 100 amp 101 Item Parts Description 1 Bracket For Main Burner Orifice 2 Main 2 2 1 3 Main Burner w Pilot Bracket 4 Pilot Burner
29. ble of measuring continuity e gas pressure gauge or manometer gauge AOS pt no 8099 2 e water pressure gauge AOS pt no 4798 thermometer AOS pt no 4870 range 0 220 degree F e 1 2 inch socket with extension for removal of the clean out cover e 1 1 16 inch socket with extension for anode removal MISC TC 043 Revision 1 vs TC 043 Revision 1 Adds Additional model s information Adds cover statement this Handbook s also a Service Handbook for many BTC Models Includes Power vent kit information Includes BTR C 500 gas valve information Updated Damper illustrations Hevision2 e Revised Part Numbers on Page 15 Hevision 3 e Adds information unique to the Efflkal damper equipped Series 110 111 and Retrofit models A O Smith Water Products Service Handbook Irving Texas 2000 2 Training Department 5 SERVICE HANDBOOK INSTALLATION This portion of the handbook will review some often overlooked installation considerations taking note of necessary installation requirements for the BTR 120 through 500 model heaters The installation manual covers most of these items in detail CLEARANCES FROM COMBUSTIBLES ut TOP VIEW FRONT VIEW OF BTR OF BTR MODEL NNNM 6 120 200 1 2 54CM 1 2 54 1 2 54CM 250 305 2 5 08CM 2 5 08CM 2 5 08CM S ZL75CM 365 500 7 75CM 7 75CM 7 75CM 24 inch clearance for all ser
30. e pilot burner assembly Once the pilot flame is established and confirmed back to the IID the sparking is stopped and the main gas valve is opened allowing gas flow to the main burner When the thermostat satisfie s main and pilot gas is shut off A O Smith Water Products Service Handbook Irving Texas 02000 16 Training Department 5 SERVICE HANDBOOK BIR ELECTRICAL SEQUENCE 100 109 Series Junction Box 5 E gt gt 207 gt SEO o um t o A O Smith Water Products Service Handbook Irving Texas 2000 17 Training Department 5 SERVICE HANDBOOK BTR ELECTRICAL SEQUENCE OF OPERATION On OFF Switch ON 24V Transformer Tank Temperature Tank Temperature Satisfied High Limit Closed High Limit ECO Closed Saree aa Thermostat Closed Effikal Motor Relay Interrupts Power to Motor Motor Opens Damper Damper Spring Opens Damper Blade Cam On Damper Blade Closes Proving End Switch IID Module 24V Receives Voltage Module PV Teminal Sends 24V to Pilot Coil Module Spark Sends 10 000V Spark to Pilot Pilot Ignites and Proves Flame Spark Stops Module MV Terminal Sends 24V 90 Second Trial 5 Minute Delay Between To Main Gas Coil Trials Continuously Main Burner Heats Tank Series 110 and 111 Themostat Opens E
31. ely 7 Amps at 120VAC Q The units require leg kits to meet National Sanitation Foundation standards What are the part numbers for these kits A The BTR model heaters need AOS kit numbers BTR 120 400 except BTR 197 amp 198 series 100 Part 6570 0 BTR 197 amp 198 Series 100 Part 6570 5 BTR 500 Part 6570 7 Q When should BTRs be delimed Many variables affect the liming up process including water temperature The amount of lime accumulation during the same period of time will be nearly 2 times greater if water is stored at 140 degrees F than at 120 degrees F A 180 degree setting will build up lime about seven times as fast as a 140 degree F setting volume of water The more gallons flowing through the BIR the more rapid the accumulation hardness The harder the water the faster lime build up occurs 1 to 3 5 grains per gallon is soft 3 5 to 7 grains per gallon is moderate 7 to 10 5 grains per gallon is hard and 10 5 grains per gallon is very hard An aspirin is about 5 grains One grain is equal to 17 1 parts per million A Deliming should be done when a slight rumbling or popping sound is detected when the main burners are on Q What effect will lime build up have on the BTR water heater A One eighth inch of scale build up may reduce efficiency as much as 22 a 1 4 inch build up as much as 38 A Less efficient heat transfer means more bottom head expansion contraction stress and premature le
32. ith Water Products Company The following text and illustrations will provide you with a step by step procedure to verify proper installation operation and troubleshooting procedures Additional quick reference data is included to assist you in servicing this product The information contained in this handbook is designed to answer common questions encountered in the operation of the BTR product line and is not meant to be all inclusive If you are experiencing a problem not covered in this handbook please contact the A O Smith Technical Information Department at 1 800 527 1953 or your local A O Smith Water Products Company representative for further assistance This handbook is intended for use by licensed plumbing professionals and reference should be made to the installation manual accompanying the product This handbook contains supplemental information to the BTR installation and operation manual A O Smith Water Products Service Handbook Irving Texas 2000 1 Training Department 5 SERVICE HANDBOOK Qualifications Installation or service of this water heater requires ability equivalent to that of a licensed tradesman in the field involved Plumbing air supply venting gas supply and electrical testing skills are required Tools Required e Phillips head screwdriver e Standard screwdrivers e 3 8 and 7 16 inch open end wrench e set of marked drill bits e anelectrical multimeter tester capa
33. mmunicating with the outdoor air one permanent opening commencing within 12 in 30 cm of the top of the enclosure shall be permitted where the equipment has clearances of at least 1 in 2 5 cm from the sides and back and 6 in 16 cm from the front of the appliance The opening shall directly communicate with the outdoors and shall communicate through a vertical or horizontal duct to the outdoors or spaces crawl or attic that freely communicate with the outdoors and shall have a minimum free area of a 1 sq per 3000 BTU per hr 7 cm per kW of the total input of all equipment located in the enclosure and b Notless than the sum of the areas of all vent connectors in the confined space A O Smith Water Products Service Handbook Irving Texas 2000 6 Training Department 5 SERVICE HANDBOOK MAKE UP AIR VERTICAL DUCTS 1 Square Inch Per Often it is more practical to install vertical make up air ducts to the out doors Again two openings are required one within 12 inches of the top of the enclosure and one within twelve inches of the bottom of the enclosure Each opening shall have a free area of not less than 1 square inch per 4000 BTUH of the total input of all appliances within the enclosure A O Smith Water Products Service Handbook Irving Texas 2000 7 Training Department 5
34. on port a limited bleed vent port the manifold gas and pressure tap See step 18 for 500 gas valve illustration A O Smith Water Products Irving Texas 2000 12 INLET VIEW i Top Knob Filter Screen Gas Inlet Main Gas Regulator TR Pilot Gas Regulator 1 Limited Bleed Manifold Port Pressure Pilot Gas Gas Connection Port Service Handbook Training Department 5 SERVICE HANDBOOK VENTING Atmospheric Multiple Heaters Chimney A minimum of rise per foot of horizontal vent is required All BTR water heaters are classified by ANSI as category non condensing negative pressure venting appliances They are approved for type B vent For larger applications BTR water heaters can be common vented together either in a tapered manifold or constant size manifold Follow National Fuel Gas Code requirements for sizing and installation BTRs may be common vented only with other category appliances See venting section in the National Fuel Gas Code A O Smith Water Products Service Handbook Irving Texas 2000 13 Training Department 5 SERVICE HANDBOOK DRAFT INDUCER Draft inducers can be used with BTR water heaters to mechanically aid a lazy chimney in vertical vent applications They are not designed to allow through the wall vent installations See Power Venter SINGLE UNIT I
35. on to service switch A O Smith Water Products Service Handbook Irving Texas 2000 23 Training Department 5 SERVICE HANDBOOK STEP 7 THERMOSTAT TEST STEP 7 THERMOSTAT TEST Set the thermostat to call for heat Using your multimeter test for 24 VAC between right terminal and ground THEN The meter does not read 24 VAC and the jumper wire e Replace the thermostat between the high limit and the thermostat is in place The meter reads 24 VAC e step 8 Note If the high limit to thermostat jumper wire was disconnected earlier to simulate a satisfied thermostat reconnect the jumper to the terminals Note A yellow wire from this thermostat terminal connects to the damper PC board A O Smith Water Products Service Handbook Irving Texas 2000 24 Training Department 5 SERVICE HANDBOOK GO TO PAGE 27 FOR DAMPER TESTS OF EFFIKAL EQUIPPED SERIES 110 111 AND MODELS STEP 8 DAMPER INPUT TEST Test from Orange wire to Black neutral STEP 8 DAMPER INPUT TEST Test for 24 VAC between the yellow wire on the PC board and ground Effikal Check from orange wire to neutral IF 1 1 1 THEN 24 VAC is not present e Check the black wire connections between the PC board and high limit 24 VAC is present e step 6 TEST THE DAMPER BF Tan ol
36. rvice Handbook Irving Texas 2000 20 Training Department 5 SERVICE HANDBOOK 3 TEST HIGH LIMIT RIGHT TERMINAL A E 4 STEP 3 TO TEST HIGH LIMIT RIGHT TERMINAL Ensure that the jumper wire between the high limit and thermostat is connected and the damper motor power line is connected Test for 24 VAC between the high limit right terminal and ground THEN The meter does not read 24 VAC e Push the reset button and redo the test storage water temperature below 185 degrees The meter reads 24 VAC e step 4 After Push in Reset 24 VAC is resent now p Reasons For Resettinc Cause Solution installation reaching thermostat settinc Note The right terminal of the high limit has a jumper wire connected to the left terminal of the thermostat There is also a black wire connecting to the damper motor assembly This black wire supplies power to the motor to close the damper during periods of standby A O Smith Water Products Service Handbook Irving Texas 2000 21 Training Department 5 SERVICE HANDBOOK Damper Closed STEP 4 INSPECT THE DAMPER Lower the thermostat setting so the unit will not be calling for heat then inspect the damper IF THEN If the damper is open 30 to step 5 v o If the damper is closed No
37. s the system properly installed yes no Are there any water leaks yes no Does the installation have a recirculating system yes no If so is it operational yes no VI PROPER SEQUENCE OF OPERATION During standby does damper close on standby yes no During standby is pilot flame off yes no On a call for heat does thermostat close yes no On a call for heat does damper open completely yes no Does sparking begin at pilot yes no Is pilot flame established yes no If so does sparking stop yes no Does main burner ignite yes no Does the thermostat satisfy yes no Does damper close yes no Comments VII SAFETY A Gas Does pilot flame prove before main burner ignites yes no Does damper blade fully open before ignition sequence occurs yes no Is burner cover plate in place yes no Is burner floor shield in place yes no Does IID lockout occur after 30 sec trial for ignition Propane models only yes no B Water Temperature Is the thermostat adjusted to the lowest acceptable temperature yes no Does the installation have a mixing valve yes no If so is it operational yes no What is the outlet temperature of the mixing valve __ NOTE To minimize the risk of scalding the manufacturer recommends storing water at 120 F Is a properly rated temperature and pressure relief valve installed yes no C Electrical Is the 120 VAC electrical power supply properly wired yes no Are all the BTR control covers in place yes no Is the 120 VA
38. te If the water temperature in the tank is below 120 degrees F temporarily disconnect the jumper wire between the high limit and thermostat to simulate a satisfied thermostat STEP 5 CHECK THE PC BOARD STEP 5 CHECK THE PC BOARD Test for 24 VAC between the black PC board wire connection and ground THEN 24 is not present Check the black wire connections between PC Board and high limit 24 VAC is present e step 6 A O Smith Water Products Service Handbook Irving Texas 2000 22 Training Department 5 SERVICE HANDBOOK STEP 6 PC BOARD MOTOR TEST Motor Lead Service Switch Terminals STEP 6 PC BOARD MOTOR TEST Check for 24 VAC between the two motor lead terminals of the PC board Disconnect the wires for this test 24 VAC is not present Replace the board AOS part 6522 and go to step 7 The board and relay are one piece Regardless of which part is defective both parts should be changed Voltage is present This verifies that the motor is receiving power but not closing the damper Replace the motor AOS part 6521 and go to step 7 Note The service switch may be used to bypass the damper while waiting for a replacement part WARNING In the event of damper motor failure verify that the damper is in the open position before utilizing the service switch BTR Series 106 107 and some prior series changed from momentary push butt
39. unction if it gets wet Never try to use a device that has been wet replace it 58600 CONTINUOUS RE TRY G 100 SHUTOFF AUTO IGNITION 90 SEC TRIAL FOR IGNITION An 33 221 20 24V 60 Hz If module has been used with PV 1A MAX MV 1A vent damper it will only work with damper connected 97 4152 REV A Pilot is lit Sparking has stopped STEP 17 IID MODULE TEST Power to the Main Valve Using a multimeter test for 24 VAC between terminal MV on the IID and 24V GND THEN 24 VAC is not present e Replace the IID module Conduct Step 18 before applying power to replacement module 24 VAC is present e step 18 A O Smith Water Products Service Handbook Irving Texas 2000 39 Training Department 5 SERVICE HANDBOOK STEP 18A MAIN GAS VALVE CHECK MODEL 36074 46 e 24V 60 Hz 0 6 AMPS MAX PR 1 2 RSi gt ZCER AR 25 6 REG 16 0 W G RES RANGE 7 5 W C 70 12 0 W C 120 400 GAS VALVE STEP 18A MAIN GAS VALVE CHECK Disconnect wires from gas valve TH and TR terminals Using a multimeter test for 68 ohms plus or minus 5 between TH and on the main valve coll IF 1 1 THEN The meter reads O or infinit e Replace the gas valve The meter reads 68 ohms plus or minus 5 e The main burner will ignite A O Smith Water Products Service Handbook Irving Texas
40. viceable parts is recommended Clearances may vary between BTH models See instruction manual or the label on the heater for clearances applicable to your specific model A O Smith Water Products Service Handbook Irving Texas 2000 3 Training Department 5 SERVICE HANDBOOK EXTERIOR CLEARANCE More Than 10 More Than 10 Height Above Any Roof Surface NOTE Within 40 No Height Above 41777 Horizontally Parapet Required ELA Haz Mim when Distance from 3 a 3 Min Walls or Parapet b is More than 10 Wall or gt Tw Parapeti X Than 10Feet tror Less Height Above Any 3 g or Less Roof Surface S Within 10 i Horizontally Y N 10 Feet or Less Copyright by the American Gas Association Used by permission of the copyright holder This illustrates the exterior roof clearances for BTR units with natural draft venting The vent shall 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 a horizontal distance of 10 feet for vents of 12 in diameter or less NFPA 54 ANSI Z 223 1 SEC 7 5 2a Sec 7 6 2a may allow reduction to 8 feet with a Listed vent cap A O Smith Water Products Service Handbook Irving Texas 2000 4 Training Department 5 SERVICE HANDBOOK
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